Medical management of tuberculous lesions in children consists of adequate nutrition, antimicrobial therapy, general supportive measures, prevention of unnecessary exposure to other infections that further compromise the body’s defenses, prevention of reinfection, and sometimes surgical procedures.
A child with LTBI is treated with antimicrobial drugs to decrease the risk of acquiring active TB disease in the years following the initial acquisition and to reduce the lifelong chance of developing TB disease (Ranganathan and Sonnappa, 2009). The recommended drug regimen for LTBI in children and adolescents includes a daily dose of isoniazid (INH) for 9 months or alternatively two or three times per week with directly observed therapy (DOT) (Pediatric Tuberculosis Collaborative Group, 2004). Rifampin (daily for 6 months) may be used to treat children or adolescents who are INH resistant. The Pediatric Tuberculosis Collaborative Group (2004) does not recommend treatment for children or adolescents who have positive tuberculin test results but who have no risk factors.
For the child with clinically active TB, the goal is to achieve sterilization of the tuberculous lesion. The American Academy of Pediatrics (2009b) recommends a 6-month regimen consisting of INH, rifampin, ethambutol, and pyrazinamide (PZA) given daily for the first 2 months, followed by INH and rifampin given two or three times a week by DOT for the remaining 4 months. Alternative treatment regimens may be used when managed by a TB specialist. DOT decreases the rates of relapse, treatment failures, and drug resistance and is recommended for treatment of children and adolescents with TB in the United States.
DOT means that a health care worker or other responsible, mutually agreed-on individual is present when medications are administered to the patient. If the reliability of self-administration of medications is in doubt, directly observed, twice-weekly therapy must be administered by a health care professional.
Infection with M. bovis may be treated with the same four-drug regimen as TB disease, although M. bovis may be resistant to PZA, in which case an appropriate substitute should be used.
When drug resistance is suspected, either ethambutol or an aminoglycoside is added to the therapeutic regimen until drug susceptibility results are available. Therapy should always include at least four drugs initially and be continued for at least 9 months. INH, rifampin, and PZA, usually with ethambutol or an aminoglycoside, should be given for at least the first 2 months. The three-drug regimen can be used after drug-resistant disease is excluded. Optimum therapy for TB in children with HIV infection has not been established, and consultation with a specialist is advised. Any child diagnosed with TB disease should also be tested for HIV (American Academy of Pediatrics, 2009b). It is not within the scope of this text to outline the treatment regimen for multiple drug–resistant and extensively drug–resistant TB.
Surgical procedures may be required to remove the source of infection in tissues that are inaccessible to antimicrobial therapy or that are destroyed by the disease. Orthopedic procedures for correction of bone deformities, bronchoscopy for removal of a tuberculous granulomatous polyp, or resection of a portion of a diseased lung may also be performed.
Prognosis: Most children recover from primary TB infection and may be unaware of its presence. However, very young children have a higher incidence of disseminated disease. It is a serious disease during the first 2 years of life, during adolescence, and in children infected with HIV. Except in cases of tuberculous meningitis, death seldom occurs in treated children. Antibiotic therapy has decreased mortality and hematogenous spread from primary lesions.
Prevention: The only certain means to prevent TB is to avoid contact with the tubercle bacillus. Maintaining an optimum state of health with adequate nutrition and avoiding debilitating infections promote natural resistance but do not prevent infection.
Pasteurization of milk and routine testing and elimination of diseased cattle have helped reduce the incidence of bovine TB. Infants and children should be given only pasteurized milk from TB-free cattle.
A source of concern is that the infected child or family members may spread the disease when visiting in the hospital. Most children with TB need not be isolated and can be hospitalized on an open unit if they are receiving chemotherapy. Children and adolescents with infectious pulmonary TB (i.e., those whose sputum smears show acid-fast bacilli) should be on Isolation Precautions until effective chemotherapy has been initiated, their sputum smears show a diminishing number of organisms, and their cough is improving. Masks are indicated only when the child is coughing and does not reliably cover his or her mouth. Gowns are indicated only if needed to prevent gross contamination of clothing. Family members should be managed with Airborne Precautions when visiting until they are demonstrated not to have infectious TB.
Limited immunity can be produced by administration of BCG. The freshly prepared vaccine, injected intradermally, produces definite although incomplete protection against TB (ranging from 0% to 80%). In most instances, positive tuberculin reactions develop after inoculation. BCG vaccination is not generally recommended for use in the United States. However, it may be recommended for long-term protection of infants and children with negative TST who are not infected with HIV and who (1) are at high risk for continuing exposure to persons with infectious pulmonary TB or (2) are continuously exposed to persons with TB who have bacilli resistant to both INH and rifampin (American Academy of Pediatrics, 2009b).
Hospitalization for TB is seldom necessary in the United States. Only children with the more serious forms of the disease are placed in the hospital. The major nursing care of children with TB involves nurses in ambulatory settings: outpatient departments, schools, and public health agencies.
Asymptomatic children can lead an essentially unrestricted life. They can and should attend school (or daycare), but older children are restricted from vigorous activities such as competitive games and contact sports during the active stage of primary TB. They should be protected from stresses, including parental anxieties, overprotection, and pressures regarding nutritional intake. They should also continue the regular immunization schedule and maintain optimum health with proper diet, adequate rest, and avoidance of infection.
Nurses assume several roles in management of the disease, including helping the family understand the rationale for diagnostic procedures, assisting with radiographic examinations, performing skin tests, and obtaining specimens for laboratory examination. Skin tests must be carried out correctly to obtain accurate results (see previous discussion on Tuberculin Test).
Sputum specimens are difficult or impossible to obtain from an infant or young child because they swallow any mucus coughed from the lower respiratory tract. The best means for obtaining material for smears or culture is by gastric washing (i.e., aspiration of lavaged contents from the fasting stomach with a nasogastric tube). The procedure is carried out and the specimen obtained early in the morning before the customary breakfast time. In some cases an induced sputum specimen may be obtained by administering aerosolized normal saline for 10 to 15 minutes, followed by CPT and suctioning of the nasopharynx for sputum collection.
Ambulatory Care: Nursing supervision of the child at home involves teaching the parents and child about the disease and its ramifications. Historically the disease has been regarded with fear, and numerous misconceptions need to be addressed. Reducing parental anxieties helps them deal with the illness more constructively and collaborate more effectively in planning the child’s continued care. Because the success of therapy depends on compliance with drug therapy, instruct the parents regarding the importance of giving the medication as often and as long as it is ordered. (See Compliance, Chapter 27.) Promoting optimum general health and preventing intercurrent infections and reinfections with the tubercle bacillus are important. The American Lung Association has excellent patient education materials.*
Case Finding: Case finding and follow-up of known contacts are important nursing responsibilities. Every case of TB identified in the community involves nurses in follow-up of known contacts—individuals from whom the affected person may have acquired the disease and persons who may have been exposed to the diseased individual. Early diagnosis affords a means for early protection or treatment and prevents further spread of the disease.
Foreign Body Ingestion and Aspiration
Small children characteristically explore objects with their hands and mouth and are prone to place FBs into the air passages (nose and mouth). They also place objects such as beads, paper clips, plastic toys, small magnets, or food items in the nose, which can easily be aspirated into the trachea. Small items may also be placed into the external ear canal; small rocks and pebbles appear to be a favorite item for boys, whereas girls prefer colorful beads.
When such objects are placed into the nose or mouth, they can be aspirated into the airway, causing subsequent obstruction. Ingestion or aspiration of an FB can occur at any age but is most common in older infants and children ages 1 to 3 years. Severity depends on the location, type of object aspirated, and extent of obstruction. For example, dry vegetable matter, such as a seed, nut, piece of carrot, or popcorn, that does not dissolve and that may swell when moistened creates a particularly difficult problem. The high fat content of potato chips and peanuts may cause the added risk of lipoid pneumonia. “Fun foods” such as hard candy and hot dog wieners are among the worst offenders. Offending foods, in the order of frequency of aspiration, are hot dog, round candy, peanut or other nut, grape, cookie or biscuit, other meat, carrot, apple, peas, and peanut butter. Round foods are the most frequent offenders. The first four items together make up more than 40% of all aspirated food items. Other items include plastic or glass beads, button or disk batteries, and coins. Objects such as small lithium or cadmium batteries may cause esophageal or tracheal corrosion.
A sharp or irritating object produces irritation and edema. A round, pliable object that does not readily break apart is more likely to occlude an airway than an object with a different shape. A small object may cause little if any pathologic change, whereas an object of sufficient size to obstruct a passage can produce various changes, including atelectasis, emphysema, inflammation, and abscess.
Most inhaled FBs lodge in a mainstem or lobar bronchus, a few find their way into more distal portions of the lung field, and the remaining FBs lodge in the trachea. The site is determined by the object’s size, weight, and configuration. For example, heavy objects such as bullets, coins, and nails are more likely to drop into the dependent portions of the tracheobronchial tree. The object may remain in the same location or move in the airway. It can be coughed from a smaller to a larger airway and reaspirated in a different passage—or it might be ejected forcefully into the mouth and subsequently swallowed.
Signs of obstruction caused by an FB in a bronchus are explained by the same mechanisms that control the flow of fluids in pipes (Fig. 32-6). During normal respiration the caliber of bronchi and bronchioles becomes larger during inspiration and smaller during expiration. When a small object partially obstructs a passage, air passes around the obstruction during both inspiration and expiration (bypass valve). In this type of obstruction a wheeze is heard. A somewhat larger obstruction will allow air to enter the distal portion when bronchioles enlarge during inspiration, but when they diminish in caliber during expiration, the lumen becomes occluded and air becomes trapped distal to the obstruction (check valve). This type of obstruction produces obstructive hyperinflation. When there is complete blockage of the bronchus by an FB or by the FB and swollen mucosa, air is unable to move in either direction (stop valve), and the air distal to the obstruction is absorbed, leaving an area of obstruction atelectasis. The right bronchus, with its shorter length and straighter angle, is the usual site of bronchial obstruction.
Initially, an FB in the air passages produces choking, gagging, or coughing, but symptoms depend on the site of obstruction and on the interval between aspiration and presentation. Up to half of all children with FB ingestion may be asymptomatic (Uyemura, 2005). Laryngotracheal obstruction most commonly causes dyspnea, cough, stridor, and hoarseness because of a decreased air entry. Cyanosis may also occur if the obstruction becomes worse. Bronchial obstruction usually produces cough (frequently paroxysmal), wheezing, asymmetric breath sounds, decreased airway entry, and dyspnea.
If the obstruction progresses, the child’s face may become livid, and sometimes the child becomes unconscious and dies of asphyxiation if the object is not removed. If obstruction is partial, hours, days, or even weeks may pass without symptoms after the initial period. Secondary symptoms are related to the anatomic area in which the FB is lodged and are usually caused by a persistent respiratory tract infection located distal to the obstruction. A history of recurrent intractable pneumonia is reason to consider an FB in an airway. Often, by the time secondary symptoms appear, the parents have forgotten the initial episode of coughing and gagging. The most common symptoms observed in children brought to medical attention are stridor, wheezing, sternal retraction, and cough. When an object is lodged in the larynx, the child is unable to speak or breathe.
The diagnosis of FB obstruction is usually suspected on the basis of the history and physical signs. Radiographic examination reveals opaque FBs but is of limited value in localizing vegetable matter and some plastic items. Bronchoscopy is required for a definitive diagnosis of objects in the larynx and trachea. Fluoroscopic examination is valuable in detecting FBs in the bronchi.
On fluoroscopy a check-valve–obstructed lung remains expanded, the diaphragm remains low and fixed on the obstructed side, and the heart and mediastinum shift to the unobstructed side during expiration. In a stop-valve obstruction the heart and mediastinum are drawn to the obstructed side and remain there during both inspiration and expiration. The diaphragm on the obstructed side remains high, whereas that on the unobstructed side moves normally.
The mainstay of diagnosis and management of foreign bodies is endoscopy. If there is doubt about the presence of an FB, endoscopy can be diagnostic and therapeutic. When endoscopy is used to remove an FB, the procedure should be performed by an endoscopist who is experienced and comfortable in caring for children. The endoscopist should also have access to state-of-the-art endoscopy equipment and should perform the procedure in a setting that can accommodate any complication or emergency.
FB aspiration may result in life-threatening airway obstruction, especially in infants because of the small diameters of their airways. Current recommendations for the emergency treatment of the choking child include the use of abdominal thrusts for children over 1 year of age and back blows and chest thrusts for children less than 1 year of age. (See Cardiopulmonary Resuscitation, Chapter 31.) An FB is rarely coughed up spontaneously; therefore it must be removed by endoscopy. Removal of the FB must be done as soon as possible, since the progressive local inflammatory process triggered by the foreign material hampers removal. In addition, a chemical pneumonia soon develops and vegetable matter begins to macerate within a few days, further complicating its removal.
A major role of nurses is to recognize the signs of FB aspiration and implement immediate measures to relieve the obstruction. All persons working with children should be prepared to deal effectively with aspiration of an FB. Choking on food or other material should not be fatal. Two simple procedures—back blows and the abdominal thrust, which can be used by both health professionals and laypersons—can save lives. It is the nurse’s obligation to learn these techniques and teach them to parents and other groups. (See Figs. 31-26 and 31-27.) To aid a child who is choking, nurses need to recognize the signs of distress. Not every child who gags or coughs while eating is truly choking.
Prevention: Small children should not be allowed access to small objects that they might place in their nose or mouth. Anticipatory guidance for parents of small children is essential. Nurses are in a position to teach prevention in a variety of settings (see Community Focus box). They can educate parents singly or in groups about hazards of aspiration in relation to the developmental level of their children and encourage them to teach their children safety. Caution parents about behaviors that their children might imitate (e.g., holding foreign objects, such as pins, nails, and toothpicks, in their lips or mouth). (Chapters 12 and 14 discuss prevention based on the child’s age.)
Children sometimes place foreign objects, such as food (peanuts are a favorite), crayons, small plastic toys, pieces of plastic, beans, beads, erasers, wads of paper, round peas, and small stones, into their nose. An FB is suspected when there is unilateral nasal discharge that is foul smelling, local obstruction with sneezing, mild discomfort, and (rarely) pain. The irritation produces local mucosal swelling if the items increase in size as they absorb moisture (hygroscopic). Signs of obstruction and discomfort may increase with time. Infection usually follows, as evidenced by foul breath and a purulent or bloody discharge from one nostril.
Although the object is usually situated anteriorly, unskilled attempts at removal may move it further posteriorly. Removal should occur as soon as possible to prevent the risk of aspiration and local tissue necrosis. Removal usually occurs easily with either forceps or suction. In some cases mild sedation may be necessary.
Aspiration pneumonia occurs when food, secretions, inert materials, volatile compounds, or liquids enter the lung and cause inflammation and a chemical pneumonitis. Many conditions increase the risk of aspiration (Box 32-15). Aspiration of fluid or food substances is particularly hazardous in the child who has difficulty swallowing or is unable to swallow because of paralysis, weakness, debility, congenital anomalies such as cleft palate or tracheoesophageal fistula, or absent cough reflex (unconsciousness) or who is force fed, especially while crying or breathing rapidly.
Clinical signs of the aspiration of oral secretions may not be distinguishable from other forms of acute bacterial pneumonia. For example, if vegetable matter has been aspirated, manifestations may not appear for several weeks after the event. Classic symptoms include an increasing cough or fever with foul-smelling sputum, deteriorating chest radiographs, and other signs of lower airway involvement. These deviations may persist for weeks, however, while the child starts to feel better.
Children frequently develop pneumonia secondary to the ingestion of various forms of hydrocarbons, such as kerosene, gasoline, solvents, lighter fluid, furniture polish, and mineral oil. Petroleum distillates are generally impure substances contaminated with heavy metals or other toxic chemicals that cause systemic, as well as local, effects. Many hydrocarbons are made from petroleum and are found in the home or garage.
Hydrocarbons are usually packaged in attractive containers, and some have a pleasant aroma; consequently, they are frequently ingested accidentally by young children. On average, children swallow less than 30 ml (often about 3 to 4 ml). They begin coughing severely and swallow no more. Although central nervous system abnormalities, gastrointestinal irritation, cardiomyopathy, and renal toxicity can occur, the most serious complication is pneumonitis.
Distillates that have high volatility (evaporate quickly), decreased viscosity (thinner solution), and low surface tension are more likely to be aspirated and produce respiratory complications. Decreased viscosity enhances penetration into distal airways. Lower surface tension facilitates spread over a larger area of lung surface. Consequently, ingestion of lighter fluid, kerosene, or gasoline is more likely to cause a pathologic condition than substances that have high viscosity (e.g., petroleum jelly, tar, or lubricating oil).
Pathogenesis: The severity of the lung injury depends on the pH of the aspirated material, the presence of bacteria, and the volatility and viscosity of the substance. Irritation from aspiration during swallowing, vomiting, or gastric lavage may also cause pulmonary involvement. Pathologic changes include signs of inflammation (edema, hyperemia, infiltration of polymorphonuclear cells); vascular thrombosis and hemorrhage; and necrosis of bronchial, bronchiolar, and alveolar tissues. Other reactions are bronchospasm, atelectasis, emphysema, pulmonary hemorrhage, necrosis, surfactant impairment, and pulmonary edema. Even in small amounts, hydrocarbons spread over the surface of tissues and the lungs and interfere with gas exchange. Aspiration of inert fluids may not produce a chemical or bacterial pneumonia, but these fluids can decrease lung compliance and cause hypoxemia.
Clinical Manifestations: Acid aspiration may produce immediate pulmonary symptoms that worsen over the first 24 hours. Coughing and vomiting, which occur almost immediately after ingestion, contribute to the aspiration. Central nervous system symptoms include agitation, restlessness, confusion, drowsiness, and coma. The temperature is elevated (37.8° to 40° C [100° to 104° F]). (See Ingestion of Injurious Agents, Chapter 16.)
After swallowing, coughing, and choking, the child becomes short of breath, and older children complain of dyspnea. There are varying degrees of cyanosis, tachycardia, tachypnea, nasal flaring, and retractions. Intercostal retractions, grunting, cough, and fever may appear within 30 minutes or be delayed for a few hours. Localized areas of dullness are felt on percussion, and moderately intense wheezes and crackles are heard. Severe injury causes hemoptysis, pulmonary edema, severe cyanosis, and death within 24 hours of aspiration.
Therapeutic Management: Inducing the child to vomit is contraindicated because of the renewed danger of aspiration. Hydrocarbons are readily absorbed by the gastrointestinal tract and excreted by the lungs. Bronchitis or pneumonia usually develops early (within the first 24 hours) but may be delayed. Recovery from pulmonary involvement occurs in most instances despite a severe clinical course. Death is generally the result of hepatic failure complicated by pulmonary factors. Treatment is the same as for any lower respiratory tract inflammation and consists of high humidity, supplemental oxygen, hydration, and treatment of any secondary infection. Endotracheal intubation may be required if the child develops respiratory failure.
Oily substances aspirated into the respiratory passages initially cause an interstitial proliferative inflammation that may include an exudative pneumonia. The next stage involves a diffuse, chronic, proliferative fibrosis that is often complicated by acute bronchopneumonia. The final stage features multiple localized nodules or tumorlike paraffinomas. There are no characteristic manifestations. Cough is usually present, and dyspnea occurs in severe cases. Secondary bronchopneumonia is common. The outcome depends on the extent of pulmonary damage, the general condition of the infant or child, and discontinuation of the oily inhalation. No specific treatment exists.
A significant number of infants suffer talcum powder aspiration. Commercial talcum powder is predominantly a mixture of talc (hydrous magnesium silicate) and other silicates. Severe respiratory distress occurs immediately as a result of an inflammatory reaction in small bronchioles initiated by deep inhalation of the extremely light powder. (See Chapter 12 for further discussion of powder inhalation.)
Care of the child with aspiration pneumonia is the same as that described for the child with pneumonia from other causes. However, the major focus of nursing care is on prevention of aspiration. Proper feeding techniques should be carried out for weak, debilitated, and uncooperative children, and measures should be taken to prevent aspiration of any material that might enter the nasopharynx. Nasogastric tubes used for feedings are checked before the initiation of bolus feedings; continuous nasogastric tube feedings are also evaluated periodically for proper tube placement. Children who are at risk for swallowing difficulties as a result of illness, physical debilitation, anesthesia, or sedation are kept NPO (nothing by mouth) until they can properly swallow fluids effectively. The child who is at risk for vomiting and incapable of protecting the airway should be positioned in a side-lying recovery position. (See Fig. 31-28.)
Oily nose drops and oil-based vitamin preparations are not appropriate for infants and small children. Solvents, lighter fluid, and other hydrocarbon substances should be kept away from older infants and small children, who are likely to put anything in their mouth and who may be attracted by the slightly sweet smell.
Talcum powder should not be used. If used, careful application (placing it on the caregiver’s hand and then on the child’s skin) and proper storage are essential.
ARDS occurs in children and adults and has been associated with clinical conditions and injuries such as sepsis, trauma, viral pneumonia, fat emboli, drug overdose, reperfusion injury after lung transplantation, smoke inhalation, and near-drowning. ARDS is characterized by respiratory distress and hypoxemia that occur within 72 hours of a serious injury or surgery in a person with previously normal lungs. ALI is said to involve a spectrum of inflammatory disease responses to a precipitating event, with ARDS being the more severe form of ALI (Frye, 2005; Randolph, 2009).
ARDS and ALI cause acute respiratory failure and account for significant morbidity and mortality in critically ill patients. Acute pulmonary inflammation with alveolar capillary membrane destruction results in significant hypoxemia, and mechanical ventilation is often required. ARDS is the most severe in the spectrum of illnesses in relation to the degree of hypoxemia. Hypoxemia is expressed as the ratio of partial pressure of oxygen (Pao2) to fraction of inspired oxygen (Fio2), or P/F ratio, with the P/F ratio for ALI being 300 or less and the P/F ratio for ARDS being 200 or less. Both ALI and ARDS demonstrate radiographic evidence of bilateral alveolar infiltrates without evidence of left-sided heart failure (Rice and Bernard, 2006).
The hallmark of ARDS is increased permeability of the alveolocapillary membrane that results in pulmonary edema. During the acute phase of ARDS, the alveolocapillary membrane is damaged, with an increasing pulmonary capillary permeability and resulting interstitial edema. Later stages are characterized by pneumocyte and fibrin infiltration of the alveoli, with the start of either the healing process or fibrosis. When fibrosis occurs, the child may demonstrate respiratory distress and the need for mechanical ventilation. In ARDS the lungs become stiff as a result of surfactant inactivation, gas diffusion is impaired, and eventually bronchiolar mucosal swelling and congestive atelectasis occur. The net effect is decreased functional residual capacity, pulmonary hypertension, and increased intrapulmonary right-to-left shunting of pulmonary blood flow. Surfactant secretion is reduced, and the atelectasis and fluid-filled alveoli provide an excellent medium for bacterial growth (Fig. 32-7).
Fig. 32-7 Pathogenesis of acute respiratory distress syndrome. IL-1, Interleukin-1; PAF, platelet-activating factor; RBCs, red blood cells; TNF, tumor necrosis factor; V/Q, ventilation-perfusion. (From McCance KL, Huether SE: Pathophysiology: the biological basis for disease in adults and children, ed 6, St Louis, 2010, Mosby.)
The criteria for diagnosis of ARDS in children are an acute antecedent illness or injury, acute respiratory distress or failure, severe arterial hypoxemia (see above) unresponsive to oxygen therapy alone, no evidence of left atrial hypertension, and diffuse bilateral infiltrates evidenced on chest radiography (Randolph, 2009). The child with ARDS may first demonstrate only symptoms caused by an injury or infection, but as the condition deteriorates, hyperventilation, tachypnea, increasing respiratory effort, cyanosis, and decreasing oxygen saturation occur. In one study severe sepsis with pneumonia as the primary infection focus was the leading cause of ALI (Zimmerman, Akhtar, Caldwell, et al, 2009).
Treatment involves supportive measures such as maintenance of adequate oxygenation and pulmonary perfusion, treatment of infection (or the precipitating cause), maintenance of adequate cardiac output and vascular volume, hydration, adequate nutritional support, comfort measures, prevention of complications such as gastrointestinal ulceration and aspiration, and psychologic support. Prone positioning may be used to improve oxygenation, but studies have not demonstrated prone positioning to decrease the total number of days on mechanical ventilation; in addition this requires close communication and coordination among the health care team (Curley, Hibberd, Fineman, et al, 2005; Frye, 2005). Definitive therapy is directed toward improvement of oxygenation. The use of endotracheal intubation, positive end-expiratory pressure, and low tidal volume may be required to ensure maximum oxygen delivery by increasing functional residual capacity, reducing intrapulmonary shunting, and reducing pulmonary fluid. Ventilation with low tidal volume (6 ml/kg of ideal body weight) has been associated with lower mortality rates in children with ALI (Albuali, Singh, Fraser, et al, 2007; Hanson and Flori, 2006).
Additional supportive strategies in the treatment of ARDS in children include the use of permissive hypercapnia, inhaled nitric oxide, exogenous surfactant administration, high-frequency ventilation, partial liquid ventilation, and extracorporeal life support (extracorporeal membrane oxygenation, or ECMO). Exogenous surfactant therapy has increased oxygenation status in infants and children with ARDS-ALI and decreased disease severity (Willson, Chess, and Notter, 2008). Once the underlying cause is identified, specific treatment (e.g., antibiotics for infection) is initiated.
Prognosis: In spite of advances in understanding and treating ARDS-ALI, childhood mortality rates of 18% to 49% have been reported (Albuali, Singh, Fraser, et al, 2007; Randolph, 2009), and prolonged respiratory failure requiring an average of 10 to 16 days on mechanical ventilation is common (Randolph, 2009). The precipitating disorder influences the outcome. The worst prognosis is associated with profound hypoxemia, uncontrolled sepsis, bone marrow transplantation, cancer, and multisystem involvement with hepatic failure. Children who recover may have persistent cough and exertional dyspnea.
The child with ARDS is cared for in intensive care during the acute stages of illness. Nursing care involves close monitoring of oxygenation and respiratory status, cardiac output, perfusion, fluid and electrolyte balance, and renal function (urinary output). Blood gas analysis and pulse oximetry are important evaluation tools. Parenteral and enteral nutritional support is often required because of the length of the acute phase of the illness. Medications are administered to reduce pulmonary fluid, decrease pulmonary hypertension, and treat the underlying cause (e.g., antibiotics for sepsis). Nursing management also includes managing pain, monitoring the effects of the numerous parenteral fluids and drugs used to stabilize the child, and monitoring for changes in the child’s hemodynamic status. Most children with ARDS require invasive monitoring via a central venous line and possibly a pulmonary artery catheter to monitor oxygenation and administer medications. The nursing care of the child with ARDS also involves close observation of skin condition and prevention of breakdown, passive range of motion for prevention of muscle atrophy and contractures, and nutritional support.
Respiratory distress is a frightening situation for both the child and the parents, and attention to their psychologic needs is a major element in the care of these children. The child is often sedated during the acute phase of the illness, and weaning from sedation requires close monitoring for anxiety reduction and comfort. Because the mortality rate of ARDS is high, keep the family informed of the child’s status, progression through the various stages of the illness, and, as appropriate, the possibility of death. (See Chapter 23.)
A number of noxious substances that may be inhaled are toxic to humans. They are primarily products of incomplete combustion and cause more deaths from fires than flame injuries do. The severity of the injury depends on the nature of the substances generated by the material being burned, whether the victim is confined in a closed space, and the duration of contact with the smoke.
Possible inhalation injury is suspected when there is a history of flames in a closed space, whether or not burns are present. Sooty material around the nose or in the sputum; singed nasal hairs; or mucosal burns of the nose, lips, mouth, or throat are all signs that the affected person requires observation for possible pulmonary injury from inhalants. A hoarse voice and cough are further evidence of airway involvement, and increased inspiratory and expiratory stridor indicates severe damage to the upper passages. Signs of respiratory distress also include tachypnea; tachycardia; and diminished or abnormal breath sounds, including crackles and wheezes.
Three distinct syndromes of pulmonary complications may occur in the child suffering from inhalation injury: (1) early carbon monoxide poisoning, airway obstruction, and pulmonary edema; (2) ARDS occurring at 24 to 48 hours, or later in some cases; and (3) late complications of bronchopneumonia, and pulmonary emboli (Antoon and Donovan, 2007). Strangulation may also occur from the cervical eschar secondary to a severe burn.
Smoke inhalation causes three different types of injury: heat, local chemical, and systemic.
Heat Injury: Heat causes thermal injury to the upper airway, but because air has low specific heat, the injury goes no farther than the upper airway. Reflex closure of the glottis prevents injury to the lower airway. Heat may reach the middle airway occasionally, but it rarely penetrates to the lungs.
Chemical Injury: The combustion of materials such as clothing, furniture, and floor coverings can generate a wide variety of gases. Acids, alkalis, and their precursors in smoke can produce chemical burns. These substances can be carried deep into the respiratory tract, including the lower respiratory tract, in the form of insoluble gases. Soluble gases tend to dissolve in the upper respiratory tract.
Synthetic materials are especially toxic, producing gases such as oxides of sulfur and nitrogen, acetaldehyde, formaldehyde, hydrocyanic acid, and chlorine. Heated plastics are the source of extremely toxic vapors, including chlorine and hydrochloric acid from polyvinylchloride, and hydrocarbons, aldehydes, ketones, and acids from polyethylene. Irritant gases such as nitrous oxide or carbon dioxide combine with water in the lungs to form corrosive acids. Aldehydes cause denaturation of proteins, cellular damage, and edema of pulmonary tissues. Chemical burns to the airways are similar to burns on the skin, except they are painless because the tracheobronchial tree is relatively insensitive to pain.
Inhalation of small amounts of noxious irritants produces alveolar and bronchiolar damage that can lead to obstructive bronchiolitis. Severe exposure causes further injury, including alveolocapillary damage with hemorrhage, necrotizing bronchiolitis, and inhibited secretion of surfactant, with resultant atelectasis.
Systemic Injury: Gases that are nontoxic to the airways (e.g., carbon monoxide, hydrogen cyanide) can cause injury and death by interfering with or inhibiting cellular respiration. Carbon monoxide is a colorless, odorless gas with an affinity for hemoglobin 230 times greater than that of oxygen. When carbon monoxide enters the bloodstream, it readily binds with hemoglobin to form carboxyhemoglobin (COHb). Because carbon monoxide combines more readily and is released less readily than oxygen, very low levels of tissue oxygen must be reached before appreciable amounts of oxygen are released from the hemoglobin. Therefore tissue hypoxia reaches dangerous levels before oxygen is available to meet tissue needs.
Accidental carbon monoxide poisoning is most often a result of exposure to fumes from heaters or smoke from structural fires, although poorly ventilated recreational vehicles with improperly operated or maintained gas lamps or stoves and cooking in underventilated areas with charcoal grills or hibachis are also frequent causes. Intentional carbon monoxide poisoning may occur in an attempted suicide in the vehicle parked in a closed garage for a long period. Accidental carbon monoxide poisoning may also occur in a vehicle with inadequate vented exhaust which leaks into the vehicle’s passenger (or closed truck bed) compartment. Carbon monoxide is produced by incomplete combustion of carbon or carbonaceous material, such as wood or charcoal.
The signs and symptoms of carbon monoxide poisoning are secondary to tissue hypoxia and vary with the level of COHb. Mild manifestations include headache, visual disturbances, irritability, and nausea, whereas more severe intoxication causes confusion, hallucinations, ataxia, and coma. Carbon monoxide may increase cerebral blood flow, increase cerebral capillary permeability, and increase cerebrospinal fluid pressure, all of which contribute to the central nervous system signs observed. The bright, cherry red lips and skin often described are less common than pallor and cyanosis.
The treatment of children with smoke toxicity is largely symptomatic. The most widely accepted treatment is placing the child on humidified 100% oxygen as quickly as possible and monitoring for signs of respiratory distress and impending failure. Blood gases are drawn to determine baseline arterial blood gases and COHb levels. Arterial oxygen partial pressure may be within normal limits unless there is marked respiratory depression. If carbon monoxide poisoning is confirmed, 100% oxygen is continued until COHb levels fall to the nontoxic range of about 10%.
Respiratory distress may occur early in the course of smoke inhalation as a result of hypoxia, or patients who are breathing well on admission may suddenly develop respiratory distress. Therefore endotracheal intubation equipment should be readily available. Transient edema of the airways can occur at any level in the tracheobronchial tree. Assessment and localization of the obstruction should be accomplished before severe swelling of the head, neck, or oropharynx occurs. Intubation is often necessary when (1) severe burns in the area of the nose, mouth, and face increase the likelihood of developing oropharyngeal edema and obstruction; (2) vocal cord edema causes obstruction; (3) the patient has difficulty handling secretions; and (4) progressive respiratory distress requires artificial ventilation. Controversy surrounds tracheotomy, but many prefer this procedure when the obstruction is proximal to the larynx and reserve nasotracheal intubation for lower tract involvement.
Pulmonary care may be facilitated by bronchodilators, inhaled corticosteroids, humidification, and CPT to enhance the removal of necrotic material, minimize bronchoconstriction, and avoid atelectasis. Bronchoscopy may be needed to clear heavy secretions.
Carbon monoxide is excreted primarily through the lungs. Treatment of carbon monoxide intoxication with 100% oxygen via nonrebreathing face mask reduces the COHb level by one half in 40 to 60 minutes. Hyperbaric oxygen may be required for severe carbon monoxide poisoning (COHb level >25% in children) (Rodgers, Condurache, Reed, et al, 2007).
Nursing care of the child with inhalation injury is the same as that for any child with respiratory distress. The initial goal is to maintain a patent airway and effective ventilation status; endotracheal intubation may be required early depending on the patient’s respiratory status and the progression of airway and pulmonary edema. (See also Respiratory Failure, Chapter 31.) In the acute phase take vital signs, oxygenation, work of breathing, and other respiratory assessments frequently, and carefully observe and maintain the pulmonary status. The administration of nebulized bronchodilators, humidified oxygen, and inhaled corticosteroids is often part of the nursing care if a respiratory specialist is not available. CPT is also an important part of the therapeutic program. IV fluids are often required to maintain adequate hydration if the patient’s respiratory status is deteriorating. Fluid requirements for children experiencing inhalation injury are greater than for those with surface burns alone. However, one concern is the development of pulmonary edema; therefore accurate monitoring of intake and output is essential. For the patient requiring mechanical ventilation, the nurse monitors respiratory status and ensures airway patency is maintained. Such patients may be mildly sedated initially; once they are alert, the nurse reassures the patients of the temporary nature of the inability to speak, effectively manages any pain they are experiencing, and implements comfort measures.
In addition to the observation and management of the physical aspects of inhalation injury, the nurse also deals with the psychologic needs of a frightened child and distraught parents. Parents need support; reassurance; and information about their child’s condition, treatment, and progress.
Numerous investigations indicate that parental smoking is an important cause of morbidity in children. Children exposed to passive or environmental tobacco smoke have an increased number of respiratory illnesses, increased respiratory symptoms (e.g., cough, sputum, and wheezing), and reduced performance on pulmonary function tests (PFTs). AOM and OME are also increased in children who have smoking parents. Indoor exposure to environmental tobacco smoke has been linked to asthma in children (Morkjaroenpong, Rand, Butz, et al, 2002). Among children with asthma, there is an association between parental cigarette smoking and asthma exacerbations, trips to the emergency department, medication use, and impaired recovery after hospitalization for acute asthma. Children exposed to second-hand smoke experience more wheezing episodes as infants. Maternal cigarette smoking is associated with increased respiratory symptoms and illnesses in children; decreased fetal growth; increased deliveries of low-birth-weight, preterm, and stillborn infants; and a greater incidence of sudden infant death syndrome (SIDS). Antenatal maternal smoking has emerged as a significant risk factor for SIDS (American Academy of Pediatrics, 2005). The risk for diagnosis of early-onset asthma in the first 3 years of life is associated with in utero exposure to maternal smoking; grandmaternal smoking was also associated with an increased risk of early-onset asthma in the grandchild even if the mother did not smoke during pregnancy (Li, Langholz, Salam, et al, 2005). Exposure to tobacco smoke during childhood may also contribute to the development of bronchopulmonary dysplasia in the adult.
State, federal, and local governments have enacted legislation prohibiting smoking in public and work places. Children experience more second-hand smoke exposure in the home setting than anywhere else. The impact of tobacco smoke also contributes to an increase in childhood deaths attributed to residential fires in households where adults smoke. The financial impact of second-hand smoke exposure is significant. The Centers for Disease Control and Prevention (2008) estimates that from 2001 to 2004 the average annual smoking-attributable health care expenditures were $96 billion.
Recently concern has grown regarding third-hand tobacco exposure—the tobacco toxins that remain in the environment long after the smoker has stopped smoking. Such toxins may be found in elevators, cars, and homes and on clothing. The 2006 surgeon general’s report concluded there is no risk-free level of tobacco exposure because of the residual effects of the chemical toxins in tobacco (Surgeon General Report, 2006). The effect of such chemicals on the developing child’s brain are under evaluation.
The amount of passive smoke exposure in infants and children is directly related to the presence of smoking parents and the number of smokers in a household. Past studies that have measured passive smoke exposure have analyzed the amount of cotinine in a child’s urine (Winkelstein, Tarzian, and Wood, 1997; Olivieri, Bodini, Peroni, et al, 2006). Cotinine, a by-product of nicotine, is considered a valid biochemical marker for environmental smoke exposure. Urinary cotinine levels are increased in children who live in homes with smokers, and these levels increase proportionately with the number of smokers in the home. Cotinine levels have also been used to document exposure to passive smoke in the fetus and newborn.
Passive smoke exposure during childhood may also contribute to the development of bronchopulmonary dysplasia in adulthood, and some have attributed infertility in adults to exposure to second-hand smoke as children. Nurses and other health care professionals need to include assessments of passive smoke exposure in all children, especially those with respiratory illnesses. In families where smokers refuse to quit, house rules should be established for reducing smoke in the child’s environment. Nurses should also inform caregivers of the health hazards of children’s exposure to tobacco smoke*; set an example for children and families; and become advocates for “no smoking” ordinances in public places, prohibition of advertising tobacco products in the media, and inclusion of health warnings of sidestream smoke on tobacco products. Nurses also have an important role in offering tobacco smoking cessation counseling and in teaching such classes in the community at large. The role of the nurse in promoting smoking cessation among adolescents is discussed in Chapter 21.
Allergic rhinitis affects as many as 20% to 40% of the pediatric population (Ahmad and Zacharek, 2008) and is associated with numerous airway disorders, including asthma, OME, and chronic sinusitis. Seasonal allergic rhinitis (also known as hay fever) usually follows a spring-fall pattern and is caused by tree, grass, and weed pollens. Seasonal allergic rhinitis usually does not develop until the individual has been sensitized by two or more pollen seasons. Year-round or perennial allergic rhinitis is more common and is triggered by household inhaled allergens such as feathers, household dust, animal dander, air pollutants, and molds. Peak incidence for allergic rhinitis is in the adolescent and postadolescent age-groups, but younger children are also affected. The risk for allergic rhinitis is increased in children exposed to tobacco smoke and is also associated with early feeding of milk and foods in early infancy (Milgrom and Leung, 2007). Allergic rhinitis may be further classified as seasonal allergic rhinitis (SAR) and perennial allergic rhinitis (PAR). SAR has a cyclic, well-defined course, and PAR causes year-round symptoms (Ahmad and Zacharek, 2008; Milgrom and Leung, 2007).
Allergic rhinitis requires two conditions: a familial predisposition to develop allergy and exposure of a sensitized person to the allergen. Inhalants in the form of microscopic airborne particles (e.g., pollens, mold, animal danders, and environmental dusts) enter the upper respiratory tract with inhalation and bind to submucosal mast cells in the respiratory tract epithelium.
In the allergic child, symptoms are mediated by immunoglobulin E (IgE), which is produced by the child’s B lymphocytes. The IgE molecules on the cell surfaces trigger the rapid release of mast cell mediators (e.g., histamine, prostaglandins, and leukotrienes), as well as the slower synthesis of cell interactive compounds called cytokines; this action is often called the early-phase response, which occurs about 10 to 30 minutes after allergen exposure (Ahmad and Zacharek, 2008; Milgrom and Leung, 2007). Histamine, a potent vasodilator, acts directly on local receptors to produce vasodilation, mucosal edema, and increased production of mucus. The cytokines summon cells to the area and are responsible for the slower late-phase allergic reaction of inflammation and destruction of the mucosal surface, which progresses to chronic nasal obstruction. The late phase response typically occurs 4 to 8 hours after antigen exposure as a result of the migration of neutrophils, basophils, eosinophils, macrophages, and T lymphocytes into the nasal mucosa (Ahmad and Zacharek, 2008). Repeated exposure of these sensitized membranes to specific aeroallergens results in clinical allergic disease.
Children who have allergic rhinitis have a history of watery rhinorrhea, nasal obstruction, sneezing, or nasal pruritus. Symptoms may be chronic, recurrent, or acute and include itching of the nose, eyes, palate, pharynx, and conjunctiva. The nasal stuffiness sometimes progresses to partial or total obstruction of airflow, and mucus secretion with postnasal drainage can occur. Nasal itching is troublesome, and the affected child attempts to alleviate the symptoms by rubbing the nose—the “allergic salute” (Fig. 32-8). Other symptoms include snoring during sleep, fatigue, malaise, and poor school performance. Frequently children have an associated URI.
On physical examination, children may display dark circles beneath their eyes, or “allergic shiners,” secondary to obstruction of normal outflow from regional lymphatics and veins. If the nasal obstruction is severe, the child becomes an obligate mouth breather and is seen with an open mouth, or “allergic gape.” Facial findings include a horizontal nasal crease across the lower third of the nose caused by frequent rubbing induced by the nasal pruritus, and Dennie lines, or extra wrinkles below the lower eyelids. The child may develop facial tics and mannerisms in an attempt to avoid scratching the nose. Examination of the child’s nose often reveals a pale, boggy nasal mucosa with enlarged nasal turbinates.
Symptoms that appear during peak symptom periods include tearing and soreness of the eyes and gelatinous conjunctival discharge in the morning, irritability, fatigue, depression, and loss of appetite.
When the nurse suspects allergic rhinitis, it is important to obtain information regarding clinical signs of related disorders, including middle ear disease, ear pain, delayed speech or language development, chronic cough, wheezing, exercise intolerance, eczema, or urticaria. It is also important to ask about any family history of allergies and to obtain information about specific triggers or environmental changes that may have precipitated an episode of rhinitis, such as seasonal pollens, pets, cigarette smoking, or the use of a woodburning stove for cooking or as a heat source. Chronic rhinitis with significant nasal obstruction can lead to various abnormalities in growth and in physical, psychosocial, and intellectual development.
Diagnosis of allergic rhinitis is based on a thorough history and physical examination. Because allergic rhinitis is often associated with atopic dermatitis or asthma, examination of the skin and chest is indicated. Diagnostic tests include a nasal smear to determine the number of eosinophils in the nasal secretions, blood examination for total IgE and elevated eosinophils, skin tests, and various challenge tests.
Skin testing is a useful adjunct in establishing a definitive diagnosis for allergic rhinitis. Skin testing involves the injection of specific allergens and should be performed by a practitioner trained in allergy treatment who has access to reliable reagents, experience in interpreting results, and adequate facilities to treat adverse reactions to the procedure. The allergenic extract is introduced into the epidermis by (1) scratch, prick, or puncture; (2) a single intradermal injection of a dilute concentration of specific allergen; or (3) serial dilution (threefold or tenfold) injections to determine the end point of reactivity. After a suitable time (10 to 30 seconds), the size of the resultant wheal and flare reaction is measured to assess the patient’s sensitivity. The magnitude of the wheal and flare response correlates roughly with the severity of symptoms produced by natural exposure to the same allergen. However, a positive skin test does not always indicate the presence of clinical reactivity. Before skin testing occurs, the patient should withhold medications such as montelukast (Singulair) (1 day) and antihistamines (5 to 7 days for second generation and 3 or 4 days for first generation) to prevent false-negative results (Milgrom and Leung, 2007).
Skin testing and immunotherapy (see discussion below) are generally safe procedures, but they are not without risk. Severe and even fatal reactions can occur within a short time, depending on the type of extract used and individual sensitivity.
Therapy is directed toward avoidance of offending allergens and the use of medication and immunotherapy (hyposensitization or desensitization). Avoidance measures involve removing allergens from the environment and are usually effective for allergy to foods, drugs, and animals. If a patient is unable to avoid allergens, symptoms can be controlled with medication, but treatment should be individualized. Antihistamines and nasal corticosteroids are the first-line drugs used for allergic rhinitis.
Antihistamines are effective in treating sneezing, rhinorrhea, and nasal itching. Antihistamines act by inhibiting the effects of histamine by binding to H1 receptors. Classic first-generation antihistamines such as diphenhydramine (Benadryl) and chlorpheniramine (Chlor-Trimeton) are effective but may produce undesirable side effects such as sedation, restlessness, dry mouth, urinary retention, constipation, and impaired school performance. The newer second-generation antihistamines such as loratadine (Claritin) and cetirizine hydrochloride (Zyrtec) are approved for use in children 6 months of age and older (Milgrom and Leung, 2007; Hagemann, 2005). Fexofenadine hydrochloride (Allegra) is approved for children 6 years of age and older. Azelastine is a topically active antihistamine available in nasal spray for children over 5 years old. These drugs are nonsedating and have few cardiovascular adverse effects.
If nasal obstruction is a prominent feature, children may use α-adrenergic decongestants, such as pseudoephedrine, in combination with an antihistamine to relieve nasal stuffiness. Nasal or oral administration of a decongestant often provides symptomatic relief. Take caution, however, with long-term use because of rebound effects (return of symptoms) and habituation (lessened effectiveness). Other side effects of these drugs include nervousness, insomnia, and tachycardia.
Topical nasal corticosteroids (beclomethasone [Vancenase and Beconase], flunisolide [Nasalide], fluticasone [Flovent], triamcinolone [Nasacort], mometasone [Nasonex], and budesonide [Rhinocort or Pulmicort]) are safe, effective alternatives to the use of cromolyn sodium and can be used effectively on a short-term basis during periods of exacerbation. Side effects are minimal, with occasional nasal irritation and epistaxis. Inhaled corticosteroids are administered with the nasal tip pointing away from the nasal septum (cartilage). Experts have expressed concerns in relation to possible decreased linear growth in children who take intranasal corticosteroids. To date, studies have not conclusively demonstrated growth failure, yet the American Academy of Allergy, Asthma and Immunology suggests taking height measurements every 6 months in children receiving long-term inhaled corticosteroids (Hagemann, 2005).
Cromolyn sodium is used prophylactically on a regular basis and is effective in preventing both the early and the late responses to antigen. Its usefulness is limited by the fact that it must be taken four to six times a day, a schedule that is difficult to maintain in children. Ipratropium bromide (Atrovent), available as a nasal spray, may be used for serious rhinorrhea but should be limited to 3 to 5 days per month (Milgrom and Leung, 2007).
The leukotriene modifier montelukast has been approved for children 2 years and older in the management of seasonal allergic rhinitis. It is approved for patients 6 months or older with perennial allergic rhinitis. In adults and adolescents the drug has been effective in decreasing symptoms, but there are no studies of their effects in younger children with allergic rhinitis. This class of drugs inhibits mucosal edema and mucus production and decreases bronchoconstriction.
Immunotherapy may be necessary if drug therapy and avoidance of allergens are ineffective in controlling symptoms or if drugs evoke undesirable side effects. Before immunotherapy is begun, a positive skin test reaction to the allergen should be confirmed. Immunotherapy involves a series of injections with extracts of the specific allergens that cause symptoms for the child. Initially treatment is given weekly with dilute exposures, and the tolerated dosage is then gradually increased. This process takes about 4 to 8 months to complete, and then maintenance treatment is continued every 3 to 4 weeks for 3 to 5 years. Infants under 1 year rarely mount an appropriate response to allergens. Immunotherapy is most effective in reducing symptoms caused by seasonal pollen-related allergy. Sublingual immunotherapy has been used successfully in Europe; a portion of the allergen is placed under the tongue and symptom relief is achieved in 2 years (Ahmad and Zacharek, 2008).
An important aspect in nursing care of the child with allergic rhinitis is to counsel the parents and patient about the causes of the condition, or triggers, and assist in the implementation of steps to avoid the triggers. Environmental modification in the home is important (see Allergen Control, p. 1268). Nurses can also help by recognizing rhinitis and referring children for diagnosis and therapy.
Another important aspect of caring for the child with allergic rhinitis is preparation for skin tests and immunotherapy injections. These procedures are a source of stress for many children. Young children, in particular, cannot understand how uncomfortable injections that must be given regularly over a long period will make them feel better. All children who receive skin tests need an explanation of the procedure, and many children benefit from strategies that minimize trauma (see Atraumatic Care box).
Children with allergic rhinitis and their family members need specific and detailed information relating to their medications. In the case of seasonal rhinitis, antihistamines or topical antiinflammatory medications are often started approximately 2 weeks before the allergy season begins. Phone or mailed reminders to families to start their medications are helpful in preventing lower respiratory tract complications of allergic rhinitis. In addition, some nasal sprays may not reach their maximum effect or improve symptoms until a week after they are started. First-generation antihistamines that have sedation as a side effect should not be given to teenagers who are driving, and children should be cautioned to avoid hazardous activities such as bicycling or skating if drowsiness occurs; these are often best taken at night to minimize daytime drowsiness. School nurses, teachers, and parents should monitor children receiving sedating antihistamines for any changes in learning or intellectual functioning in school. Follow-up monitoring is essential to be sure that children or their parents do not exceed the correct dosage and that they follow correct administration procedures, especially with inhaled medications (see pp. 1269 and 1278).
Asthma is a chronic inflammatory disorder of the airways in which many cells (mast cells, eosinophils, and T lymphocytes) play a role. In susceptible children, inflammation causes recurrent episodes of wheezing, breathlessness, chest tightness, and cough, especially at night or in the early morning. These asthma episodes are associated with airflow limitation or obstruction that is reversible either spontaneously or with treatment. The inflammation also causes an increase in bronchial hyperresponsiveness to a variety of stimuli (National Asthma Education and Prevention Program, 2007). Recognition of the importance of inflammation has made the use of antiinflammatory agents, especially inhaled steroids, a key component in the treatment of asthma.
Critical Thinking Case Study—Asthma
Childhood asthma may be manifested in two primary types: (1) recurrent wheezing in early childhood which is usually precipitated by a viral respiratory tract infection (e.g., RSV); and (2) chronic asthma associated with allergy persisting into later childhood and often adulthood. A third type of childhood asthma is associated with girls who develop obesity and early-onset puberty (by 11 years of age) (Liu, Covar, Spahn, et al, 2007). Cough-variant asthma is a term used to describe a type of asthma in which a chronic cough is the predominant symptom; wheeze and dyspnea are usually absent. Cough-variant asthma may be treated with inhaled bronchodilators and inhaled corticosteroids (Abouzgheib, Pratter, and Bartter, 2007).
Based on the symptom indicators of disease severity, asthma is classified into four categories: intermittent, mild persistent, moderate persistent, and severe persistent. The intermittent category has the least number of symptoms; symptoms increase in frequency or intensity until the last category of severe persistent asthma (Box 32-16). These categories provide a stepwise approach to the pharmacologic management, environmental control, and educational interventions needed for each category (National Asthma Education and Prevention Program, 2007). For example, if control of asthma is not maintained at one level or step, pharmacologic therapy for the next step up should be considered. If control is adequate at one step, a gradual stepwise reduction in therapy may be possible. The stepwise approach is a guide to assist clinical decision making, but it is not a specific prescription. Therapy and management should be reviewed every 1 to 6 months and should be individualized to the patient. In addition to pharmacologic management, environmental control and educational interventions are essential at each step (National Asthma Education and Prevention Program, 2007).
A new component of the asthma severity classification system includes the domains of impairment and risk for each category; these categories emphasize the multifaceted aspect of the disease for consideration of the effects of symptoms on present quality of life and functional capacity and the future risk of adverse events (National Asthma Education and Prevention Program, 2007).
Asthma prevalence, morbidity, and mortality are increasing in the United States, especially among African-Americans (Linzer, 2007). These increases may result from worsening air pollution, poor access to medical care, or underdiagnosis and undertreatment. Asthma is the most common chronic disease of childhood, the primary cause of school absences, and the third leading cause of hospitalizations in children under the age of 15. Although the onset of asthma may occur at any age, 80% to 90% of children have their first symptoms before 4 or 5 years of age. Boys are affected more frequently than girls until adolescence, when the trend reverses.
Studies of children with asthma indicate that allergy influences both the persistence and the severity of the disease. In fact, atopy, or the genetic predisposition for the development of an IgE-mediated response to common aeroallergens, is the strongest identifiable predisposing factor for developing asthma (National Asthma Education and Prevention Program, 2007). Although allergens play an important role in asthma, 20% to 40% of children with asthma have no evidence of allergic disease. The allergic reaction in the airways is significant for two reasons: (1) it can cause an immediate reaction, with obstruction; and (2) it can precipitate a late bronchial obstructive reaction several hours after the initial exposure. This delayed bronchial response is associated with an increase in the airway hyperresponsiveness to nonimmunologic stimuli and can persist for several weeks or more after a single allergen exposure.
In addition to allergens, other substances and conditions can serve as triggers that may exacerbate asthma (Box 32-17). Asthma is a complex disorder involving biochemical, genetic, immunologic, environmental, infectious, endocrine, and psychologic factors. Evidence shows that viral respiratory tract infections may have a significant role in the development and expression of asthma (National Asthma Education and Prevention Program, 2007).
Risk factors for asthma include:
• Smoking (maternal and grandmaternal)
• Ethnicity (African-Americans at greatest risk)
• Previous life-threatening attacks
There is additional evidence of a genetic component to asthma primarily in linkages to allergic and inflammatory genes on chromosome 5 (Liu, Covar, Spahn, et al, 2007).
There is general agreement that inflammation contributes to heightened airway reactivity in asthma. Multiple mechanisms contribute to airway inflammation, involving a number of different pathways. It is unlikely that asthma is caused by either a single cell or a single inflammatory mediator. Rather, it appears that asthma results from complex interactions among inflammatory cells, mediators, and the cells and tissues present in the airways (Fig. 32-9) (National Asthma Education and Prevention Program, 2007). However, recognition of the importance of inflammation has made the use of antiinflammatory agents a key component of asthma therapy.
Fig. 32-9 Asthmatic responses. A, In the early asthmatic response, inhaled antigen (1) binds to preformed immunoglobulin E (IgE) on mast cells. Mast cells degranulate (2) and release mediators such as histamine, leukotrienes, prostaglandin D2, platelet-activating factor, and others. Acute inflammation opens intercellular tight junctions, allowing antigen to penetrate and activate submucosal mast cells. Secreted mediators (3) induce active bronchospasm, edema, and mucus secretion. Inflammatory responses are set in motion by chemotactic factors and upregulation of adhesion molecules (not shown). At the same time, as shown on the left, antigen may be received by dendritic cells that process and later present it, either in regional lymph nodes to naive (Tho) T lymphocytes or locally to memory Th2 cells in the airway mucosa (see B). B, In the late asthmatic response areas of epithelial damage are caused at least in part by toxicity of eosinophil products (major basic protein, eosinophilic cationic protein, eosinophil-derived neurotoxin, and eosinophil peroxidase). Many inflammatory cells have been recruited by chemokines and upregulation of vascular cell adhesion molecules. Local T lymphocytes display a predominant Th2 cytokine profile. They produce interleukin-4 (IL-4) and IL-13, which promote switching of B cells to favor IgE production, and IL-3, IL-5, and granulocyte-macrophage colony–stimulating factor, which encourage eosinophil differentiation and survival. (From McCance KL, Huether SE: Pathophysiology: the biological basis for disease in adults and children, ed 6, St Louis, 2010, Mosby.)
Another important component of asthma is bronchospasm and obstruction. The mechanisms responsible for the obstructive symptoms in asthma (Fig. 32-10) include (1) inflammatory response to stimuli; (2) airway edema and accumulation and secretion of mucus; and (3) spasm of the smooth muscle of the bronchi and bronchioles, which decreases the caliber of the bronchioles.
Fig. 32-10 Airway obstruction caused by asthma. A, The normal lung. B, Bronchial asthma: thick mucus, mucosal edema, and smooth muscle spasm causing obstruction of small airways; breathing becomes labored and expiration is difficult. (Modified from Des Jardins T, Burton GG: Clinical manifestations and assessment of respiratory disease, ed 3, St Louis, 1995, Mosby.)
Bronchial constriction is a normal reaction to foreign stimuli, but in the child with asthma it is abnormally severe, producing impaired respiratory function. The smooth muscle arranged in spiral bundles around the airway causes narrowing and shortening of the airway, which significantly increases airway resistance to airflow. Determine airflow by the size of the airway lumen, degree of bronchial wall edema, mucus production, smooth muscle contraction, and muscle hypertrophy.
Because the bronchi normally dilate and elongate during inspiration and contract and shorten on expiration, the respiratory difficulty is more pronounced during the expiratory phase of respiration.
Increased resistance in the airway causes forced expiration through the narrowed lumen. The volume of air trapped in the lungs increases as airways are functionally closed at a point between the alveoli and the lobar bronchi. This trapping of gas forces the individual to breathe at higher and higher lung volumes. Consequently, the person with asthma fights to inspire sufficient air. This expenditure of effort for breathing causes fatigue, decreased respiratory effectiveness, and increased oxygen consumption. The inspiration occurring at higher lung volumes hyperinflates the alveoli and reduces the effectiveness of the cough. As the severity of obstruction increases, there is reduced alveolar ventilation with carbon dioxide retention, hypoxemia, respiratory acidosis, and eventually respiratory failure.
Chronic inflammation may also cause permanent damage (airway remodeling) to airway structures; this remodeling cannot be prevented by and is not responsive to current treatments (National Asthma Education and Prevention Program, 2007).
Exacerbations are episodes of progressively worsening shortness of breath, cough, wheezing, or chest tightness or some combination of these changes. A decrease in expiratory airflow is also characteristic. Airways narrow because of bronchospasm, mucosal edema, and mucous plugging, with air being trapped behind occluded or narrowed airways. Functional residual capacity rises because the child is breathing close to total lung capacity; hyperinflation enables the child to keep the airways open and permits gas exchange to occur. Hypoxemia can occur during such episodes because of the mismatching of ventilation and perfusion. This is seen with increasing carbon dioxide tension and decreasing oxygen tension levels.
Many children with asthma exhibit an allergic component. Allergy is the strongest epidemiologic risk factor for chronic asthma morbidity and mortality. Many substances in the environment can induce an asthmatic response, but the most significant are those that are antigenic (i.e., that evoke the immune response). The antigen (or foreign substance) is deposited on the respiratory mucosa, where lysozymes immediately digest its outer coating, releasing fragments of foreign protein that initiate the immune sequence. The antibody (immunoglobulin) most active in allergic disorders, including asthma, is IgE, located primarily in skin and mucous membranes
IgE mediates the immediate hypersensitive reaction in the bronchial mucosa that leads to specific tissue binding. IgE attaches to surfaces of mast cells and basophils, where it reacts with the specific antigen to which they have developed a bonding capacity. Antigenic substances trigger an immediate hypersensitivity reaction with subsequent release of chemical mediators from mast cells and basophils: histamine; leukotrienes; platelet-activating factor; and other substances, including prostaglandins, serotonin, and various kinins. The major effects of the mediators in the airways are increased permeability of the blood vessels, contraction of smooth muscle, and stimulation of mucus secretion.
The classic manifestations of asthma are dyspnea, wheezing, and coughing. However, children may experience symptoms that range from acute episodes of shortness of breath, wheezing, and cough followed by a quiet period to a relatively continuous pattern of chronic symptoms that fluctuate in severity. Older children may complain of chest tightness and an intermittent generalized chest pain. An attack may develop gradually or appear abruptly and may be preceded by a URI. Symptoms are often worse at night. The child’s age is often a significant factor, since the first attack frequently occurs between ages 3 and 8 years. In infancy an attack usually follows a respiratory tract infection. Bronchoconstriction in response to an allergen can have an immediate, histamine type of pattern or a late response with airway hypersensitivity lasting for days, weeks, or months. A second wave of symptoms can occur 6 to 8 hours after the initial antigen exposure.
Children may experience a prodromal itching localized at the front of the neck or over the upper part of the back. An asthmatic episode usually begins with children feeling uncomfortable or irritable and increasingly restless. They may also complain of having a headache, feeling tired, or feeling tightness in the chest. Respiratory symptoms include a hacking, paroxysmal, irritative, and nonproductive cough caused by bronchial edema. Accumulated secretions, acting as an FB, stimulate the cough. As the secretions become more profuse, the cough becomes rattling and productive of frothy, clear, gelatinous sputum. Bronchial spasm and mucosal edema reduce the size of the bronchial lumen, and the bronchi may be occluded by mucous plugs.
A common symptom of asthma is coughing in the absence of respiratory tract infection, especially at night. This may disrupt sleep, leading to excessive fatigue during the day and poor school performance. Wheezing may be mild or discernible only on auscultation at the end of expiration, or severe enough to be audible.
Younger children have a tendency to assume the tripod sitting position, whereas older children have a tendency to sit upright with shoulders hunched over, hands on the bed or chair, and arms braced to facilitate the use of accessory muscles of respiration. The child speaks with short, panting, broken phrases. Infants and small children are restless, irritable, and unable to be comforted.
Infants may display supraclavicular, intercostal, suprasternal, subcostal, and sternal retractions. However, clinical symptoms of asthma may be less obvious in infancy. Because infants have a more pliant (flexible) chest, a prolonged expiratory phase may not be easy to observe. Wheezing, a characteristic symptom often associated with asthma, may occur in infants with respiratory tract infections, cardiac defects, and aspiration pneumonia.
Examination of the chest reveals hyperresonance on percussion. Breath sounds are coarse and loud, with sonorous crackles throughout the lung fields. Expiration is prolonged. Coarse rhonchi can be heard, as well as generalized inspiratory and expiratory wheezing that becomes more high pitched as obstruction progresses. With minimum obstruction, wheezing may be mild (discernible only on auscultation at the end of expiration) or even absent.
With severe spasm or obstruction, breath sounds and crackles may be inaudible. Cough is ineffective despite repeated hacking maneuvers. This represents a lack of air movement and may be misinterpreted as improvement by unknowing examiners.
Children with chronic asthma develop generalized vascularization, mucosal thickening, and hypertrophy of the mucous glands and fibers of the bronchial musculature. With repeated episodes the thoracic cavity becomes fixed in a hyperaerated state (barrel chest), with a depressed diaphragm, elevated shoulders, and increased use of accessory muscles of respiration.
The diagnosis is determined primarily on the basis of clinical manifestations, history, physical examination, and to a lesser extent laboratory tests. Generally, chronic cough in the absence of infection or diffuse wheezing during the expiratory phase of respiration is sufficient to establish a diagnosis.
PFTs provide an objective method of evaluating the presence and degree of lung disease and the response to therapy. Spirometry can generally be performed reliably on children by the age of 5 or 6 years and includes either the traditional and simple mechanical spirometer often used in clinics, offices, and the home or new computerized versions. The National Asthma Education and Prevention Program (2007) recommends that spirometry testing be done at the time of initial assessment of asthma, after treatment is initiated and symptoms have stabilized, and at least every 1 to 2 years to assess the maintenance of airway function.
Bronchoprovocation testing (i.e., direct exposure of the mucous membranes to a suspected antigen in increasing concentrations) helps to identify inhaled allergens. Exposure to methacholine, histamine, or cold or dry air may be performed to assess airway responsiveness or reactivity. Exercise challenges may be used to identify children with exercise-induced bronchospasm (EIB) (Liu, Covar, Spahn, et al, 2007). Although these tests are highly specific and sensitive, they place the child at risk for an asthmatic episode and should be done under close observation in a qualified laboratory or clinic.
Skin testing is useful in identifying specific allergens, and those obtained by the puncture technique correlate better than intracutaneous tests with symptoms and measurements of specific IgE antibody. It is recommended that all patients with year-round asthma symptoms be tested with skin tests or laboratory blood analysis to determine sensitization to perennial allergens (e.g., house dust mites, cats, dogs, cockroaches, molds, and fungus) (National Asthma Education and Prevention Program, 2007).
In addition to these tests, other important tests include laboratory tests (complete blood count with differential) and chest radiographs. The complete blood count may show a slight elevation in the white blood cell count during acute asthma, but elevations to more than 12,000/mm3 or an increased percentage of band cells may indicate respiratory tract infection. On the other hand, the presence of eosinophilia greater than 500/mm3 tends to suggest an allergic or inflammatory disorder.
Frontal and lateral radiographs show infiltrates and hyperexpansion of the airways, with the anteroposterior diameter on physical examination indicating an increased diameter (suggestive of barrel chest). Additional diagnostic tests for conditions such as gastroesophageal reflux may be carried out to determine whether they may contribute to asthma symptoms. Radiography may assist in ruling out a respiratory tract infection.
The overall goals of asthma management are to maintain normal activity levels, maintain normal pulmonary function, prevent chronic symptoms and recurrent exacerbations, provide optimal drug therapy with minimal or no adverse effects, and assist the child in living as normal and happy a life as possible. This includes facilitating the child’s social adjustments in the family, school, and community and normal participation in recreational activities and sports. To accomplish these goals, several treatment principles need to be followed (National Asthma Education and Prevention Program, 2007):
• A continuous care approach with regular visits (at least every 1 to 6 months) to the health care provider is necessary to control symptoms and prevent exacerbations.
• Prevention of exacerbations includes avoiding triggers, avoiding allergens, and using medications as needed.
• Therapy includes efforts to reduce underlying inflammation and relieve or prevent symptomatic airway narrowing.
• Therapy includes patient education, environmental control, pharmacologic management, and the use of objective measures to monitor the severity of disease and guide the course of therapy.
Allergen Control: Nonpharmacologic therapy is aimed at the prevention and reduction of exposure to airborne allergens and irritants. House dust mites and other components of house dust are frequent agents identified in children allergic to inhalants. The cockroach, another common household inhabitant, is an important allergen in many locations. Exterminating live cockroaches, carefully cleaning kitchen floors and cabinets, putting food away after eating, and taking trash out in the evening are essential measures to control cockroaches. The mouse allergen is the most recent allergen to be identified in the homes of inner-city children with asthma. The role of cat and dog dander in allergen-induced asthma has also been studied. Sensitized persons should carefully evaluate having such pets in the household; there are inconclusive data on cat dander, but there is some evidence that dog dander either has no effect or may be protective (Sharma, Hansel, Matsui, et al, 2007). Additional sources of pollutants include ozone, particulate matter produced by tobacco smoke, wood-burning stoves, pesticides, lead, mold spores, nitrogen dioxide, and sulfur dioxide; these are believed to contribute to asthma morbidity in children and should be avoided or minimized (Diette, McCormack, Hansel, et al, 2008). Exposure to tobacco smoke is a significant contributing factor in the development of asthma in infants and small children (Sharma, Hansel, Matsui, et al, 2007).
Skin testing can identify specific allergens. Steps are then taken to eliminate or avoid them. Often, simply removing the offending environmental allergens or irritants (e.g., removing carpeting from the home of a child sensitive to mold and dust particles) decreases the frequency of asthma episodes. Dehumidifiers or air conditioners control nonspecific factors, such as extremes of temperature, that trigger an episode. Avoiding known outdoor allergens such as tree, grass, and weed pollen when these are high may reduce asthma exacerbations as well. Additional suggestions include:
• Cover pillows and mattresses with plastic covers.
• Avoid using feather- or down-filled pillows and mattresses.
• Keep child indoors while lawn is being mowed, bushes and trees are being trimmed, or pollen count is high.
• Keep windows and doors closed during pollen season; use air conditioner if possible or go to places that are air conditioned, such as libraries and shopping malls, when the weather is hot.
• Wet-mop bare floors weekly; wet-dust and clean child’s room weekly; child should not be present during cleaning activities.
• Limit or prevent child’s exposure to tobacco and wood smoke; do not allow cigarette smoking in the house or car; select daycare centers, play areas, and shopping malls that are smoke free.
• Use air conditioners with a high-efficiency particulate air [HEPA] filters.
Despite the proven association between the incidence of asthma and exposure to these residential hazards, little evidence-based research demonstrates an overall reduction in symptoms, even with significant interventions aimed at environmental (housing) modifications such as removal of carpeting, cleaning, and extermination (Sandel, Phelan, Wright, et al, 2004; Sharma, Hansel, Matsui, et al, 2007) (see Complementary and Alternative Therapy box).
Drug Therapy: Pharmacologic therapy is used to prevent and control asthma symptoms, reduce the frequency and severity of asthma exacerbations, and reverse airflow obstruction. A stepwise approach is recommended based on the severity of the child’s asthma. Because inflammation is considered an early and persistent feature of asthma, therapy is directed toward long-term suppression of inflammation.
Asthma medications are categorized into two general classes: long-term control medications (preventive medications) to achieve and maintain control of inflammation, and quick-relief medications (rescue medications) to treat symptoms and exacerbations (National Asthma Education and Prevention Program, 2007).
Quick-relief and long-term medications are often used in combination. Inhaled corticosteroids, cromolyn sodium and nedocromil, long-acting β2-agonists, methylxanthines, and leukotriene modifiers are used as long-term control medications. Short-acting β2-agonists, anticholinergics, and systemic corticosteroids are used as quick-relief (or rescue) medications. Bronchodilators that relax bronchial smooth muscle and dilate the airways include β2-agonists, methylxanthines, and anticholinergics that can be used as both quick-relief and long-term medications.
Many asthma medications are given by inhalation with a nebulizer or a metered-dose inhaler (MDI). The MDI should always be attached to a spacer when an inhaled corticosteroid is administered to prevent yeast infections in the mouth. Spacers are also important for children who have difficulty coordinating or learning proper inhalation technique (Pongracic, 2003). The spacer and holder can be equipped with a mask or a mouthpiece (Fig. 32-11) (see Family-Centered Care box, p. 1278). Pharmaceutical companies are currently mandated to produce inhalers that do not contain chlorofluorocarbons (CFCs) as the propellant because CFCs have been linked to damage and depletion of the earth’s ozone level. An alternative propellant to the CFCs is hydrofluoroalkanes; the advantages include delivery of more fine particles and less oral deposition. Several currently available CFC-free MDI devices use dry powder (and also called dry powder inhalers [DPIs]); these include the Diskus inhaler and the Turbuhaler. These devices are breath activated, and the child needs to inhale as quickly and deeply as possible to use them effectively. The Diskhaler and Aerosolizer are similar, but with the Aerosolizer the medication must be loaded into the inhaler before use. Infants and young children who have difficulty using MDIs or other inhalers can receive their asthma medications via a hand-held nebulizer (Fig. 32-12). When this device is used, the medication is mixed with saline (also available in premixed form) and nebulized with compressed air. Children should breathe normally with the mouth open to provide a direct route to the trachea.
Fig 32-12 Child with asthma may take a nebulized aerosol treatment with (A) a mask or (B) mouthpiece. (Courtesy Texas Children’s Hospital, Houston.)
Corticosteroids are antiinflammatory drugs used to treat reversible airflow obstruction and control symptoms and reduce bronchial hyperresponsiveness in chronic asthma. A major change in the last two revisions of the National Asthma Education and Prevention Program guidelines (2007) is the recommendation that inhaled corticosteroids be used as first-line therapy in children over 5 years of age. Clinical studies of corticosteroids have indicated significant improvement of all asthma parameters, including decreases in symptoms, emergency visits, and medication requirements (National Asthma Education and Prevention Program, 2007).
Corticosteroids may be administered parenterally, orally, or by inhalation. Oral medications are metabolized slowly, with an onset of action up to 3 hours after administration and peak effectiveness occurring within 6 to 12 hours. Oral systemic steroids may be given for short periods (e.g., 3- or 10-day “bursts”) to gain prompt control of inadequately controlled persistent asthma or to manage severe persistent asthma. These drugs should be given in the lowest effective dose. They have few side effects (cough, dysphonia, and oral thrush), and there is strong evidence that they improve the long-term outcomes for children of all ages with mild or moderate persistent asthma. Evidence from clinical trials that monitored children for 6 years indicates that the use of inhaled corticosteroids at recommended dosages does not have long-term significant effects on growth, bone mineral density, ocular toxicity, or suppression of the adrenal-pituitary axis (National Asthma Education and Prevention Program, 2007). However, primary care providers should frequently monitor (at least every 3 to 6 months) the growth of children and adolescents taking corticosteroids to assess the systemic effects of these drugs and make appropriate reductions in dosages or changes to other types of asthma therapy when necessary. The inhaled corticosteroids include budesonide and fluticasone.
Cromolyn sodium is a nonsteroidal antiinflammatory drug (NSAID) for asthma. It stabilizes mast cell membranes; inhibits activation and release of mediators from eosinophil and epithelial cells; and inhibits the acute airway narrowing after exposure to exercise, cold dry air, and sulfur dioxide. There is no way to reliably predict whether a child will respond to the drug. Cromolyn sodium has minimal side effects (occasional coughing on inhalation of the powder formulation) and may be given via nebulizer or MDI. Nedocromil sodium inhibits the bronchoconstrictor response to inhaled antigens and inhibits the activity of and release of histamine, leukotrienes, and prostaglandins from inflammatory cells associated with asthma. The drug has few side effects and is used for maintenance therapy in asthma. The drug is not effective for reversal of acute exacerbations and is not used in children under 5 years of age
β-Adrenergic agonists (short acting) (primarily albuterol, levalbuterol [Xopenex], and terbutaline) are used for treatment of acute exacerbations and for the prevention of EIB. These drugs bind with the β-receptors on the smooth muscle of airways, where they activate adenylate cyclase and convert adenosine monophosphate (AMP) to cyclic AMP (cAMP). The increased cAMP enhances binding of intracellular calcium to the cell membrane, reducing the availability of calcium and thus allowing smooth muscle to relax. Other effects of the drug help stabilize mast cells to prevent release of mediators. Most β-adrenergics used in asthma therapy affect predominantly the β2-receptors, which help eliminate bronchospasm. β1-Adrenergic effects such as increased heart rate and gastrointestinal disturbances have been minimized. These drugs can be given via inhalation or as oral or parenteral preparations. The inhaled drug has a more rapid onset of action than the oral form. Inhalation also reduces troublesome systemic side effects: irritability, tremor, nervousness, and insomnia. Levalbuterol reportedly causes fewer side effects; however, its overall effectiveness in childhood asthma is controversial (Linzer, 2007). The 2007 National Asthma Education and Prevention Program guidelines recommend the addition of a long-acting β2-agonist to a low- or medium-dose inhaled corticosteroid to improve lung function and asthma symptoms and decrease the need for a short-acting β2-agonist. This combination may actually allow the practitioner to lower the corticosteroid dose and manage asthma symptoms just as effectively. Inhaled β-adrenergic agents should not be taken more than three or four times daily for acute symptoms without medical supervision. A continuous nebulization therapy with a short-acting β2-agonist may be used in the acute setting with an acute exacerbation.
Salmeterol (Serevent) is a long-acting β2-agonist (bronchodilator) that is used twice a day (no more frequently than every 12 hours). This drug is added to antiinflammatory therapy and used for long-term prevention of symptoms, especially nighttime symptoms, and EIB. Salmeterol is not used in children younger than 12 years of age.
Theophylline was used for decades to relieve symptoms and prevent asthma attacks; however, it is now used primarily in the emergency department when the child is not responding to maximal therapy (Linzer, 2007). Therapeutic levels should be obtained with this drug because it has a narrow therapeutic window.
Leukotrienes are mediators of inflammation that cause increases in airway hyperresponsiveness. Leukotriene modifiers (such as zafirlukast [Accolate] and montelukast sodium) block inflammatory and bronchospasm effects. These drugs are not used to treat acute episodes but are given orally in combination with β-agonists and steroids to provide long-term control and prevent symptoms in mild persistent asthma. Montelukast is approved for children 12 months old and older, whereas zafirlukast is approved for children 7 years and older.
Anticholinergics (atropine and ipratropium) help relieve acute bronchospasm. However, these drugs have adverse side effects that include drying of respiratory secretions, blurred vision, and cardiac and central nervous system stimulation. The primary anticholinergic drug used is ipratropium, which does not cross the blood-brain barrier and therefore elicits no central nervous system effects (as does atropine). Ipratropium, when used in combination with albuterol, has been effective during acute severe asthma in significantly improving lung function and reducing hospitalizations in children coming to the emergency department (Liu, Covar, Spahn, et al, 2007).
A fairly new asthma drug, omalizumab (Xolair), is a monoclonal antibody that blocks the binding of IgE to mast cells. Blocking this interaction eventually inhibits the inflammation that is associated with asthma. Because many patients with asthma are atopic and possess specific IgE antibodies to allergens responsible for airway inflammation, this drug is a promising adjunct to the treatment of asthma. It has been approved for use in children 12 years and older. The drug is administered once or twice a month by subcutaneous injection. Efficacy of omalizumab is not immediate, and clinical trials report that response to the drug was not evident before 12 weeks (Strunk and Bloomberg, 2006). Clinical trials of the drug indicate that it can be an effective therapy for patients with symptomatic moderate to severe allergic asthma that is poorly controlled with inhaled corticosteroids. However, it is expensive (Courtney, McCarter, and Pollart, 2005), and there have been reported cases of severe anaphylactic reactions. In early 2007 the FDA added a “black box warning” to the drug, which highlights the risk of anaphylaxis.
Some children with severe asthma and a history of severe life-threatening episodes may need a primary care practitioner prescription for an EpiPen (subcutaneous injectable epinephrine) (Liu, Covar, Spahn, et al, 2007).
Magnesium sulfate, a potent muscle relaxant that acts to decrease inflammation and improves pulmonary function and peak flow rate, may be used in pediatric patients treated in the emergency department with moderate to severe asthma. The drug is administered intravenously at 25 to 75 mg/kg (Liu, Covar, Spahn, et al, 2007).
Chest Physiotherapy: CPT includes breathing exercises and physical training. These therapies help produce physical and mental relaxation, improve posture, strengthen respiratory musculature, and develop more efficient patterns of breathing. For the motivated child, breathing exercises and controlled breathing help prevent overinflation and improve efficiency of the cough. However, CPT is not recommended during acute, uncomplicated exacerbations of asthma (National Asthma Education and Prevention Program, 2007) (see Bronchial [Postural] Drainage, Chapter 31).
Hyposensitization: The role of hyposensitization in childhood asthma is somewhat controversial. In the past, immunotherapy was used for seasonal allergies and when single substances were identified as the offending allergen. It is not recommended for allergens that can be eliminated, such as foods, drugs, and animal dander.
The National Asthma Education and Prevention Program guidelines (2007) recommend immunotherapy for asthma patients in the following situations:
• When there is evidence of a relationship between asthma symptoms and unavoidable exposure to an allergen to which the patient is sensitive
• When symptoms occur all year or at least during a major portion of the year
• When symptom control is difficult with drug therapy because multiple medications are required, the patient is not responsive to available drugs, or the patient refuses to take the medications
Injection therapy is usually limited to clinically significant allergens. The initial dose of the offending allergen(s), based on the size of the skin reaction, is injected subcutaneously. The amount is increased at weekly intervals until a maximum tolerance is reached, after which a maintenance dose is given at 4-week intervals. This may be extended to 5- or 6-week intervals during the off-season for seasonal allergens. Successful treatment is continued for a minimum of 3 years and then stopped. If no symptoms appear, acquired immunity is assumed; if symptoms recur, treatment begins again. Hyposensitization injections should be administered only with emergency equipment and medications readily available in the event of an anaphylactic reaction.
Exercise and Exercise-Induced Bronchospasm: EIB is an acute, reversible, usually self-terminating airway obstruction that develops during or after vigorous activity, reaches its peak 5 to 10 minutes after stopping the activity, and usually stops in another 20 to 30 minutes. Patients with EIB have cough, shortness of breath, chest pain or tightness, wheezing, and endurance problems during exercise, but an exercise challenge test in a laboratory is necessary to make the diagnosis.
The problem occurs rarely in activities that require short bursts of energy (e.g., baseball, sprints, gymnastics, skiing) and more common in those that involve endurance exercise (e.g., soccer, basketball, distance running). Swimming is well tolerated by children with EIB because they are breathing air fully saturated with moisture and because of the type of breathing required in swimming.
Children with asthma are often excluded from exercise by parents, teachers, and practitioners, as well as by the children themselves, because they are reluctant to provoke an attack. However, this practice can seriously hamper peer interaction and physical health. Exercise is advantageous for children with asthma, and most children can participate in activities at school and in sports with minimal difficulty, provided their asthma is under control. Evaluate participation on an individual basis. Appropriate prophylactic treatment with β-adrenergic agents or cromolyn sodium before exercise usually permits full participation in strenuous exertion.
Children with asthma have exacerbations at varying intervals, with severity ranging from wheezing to life-threatening status asthmaticus (Table 32-3). Protocols have been developed for treating the child experiencing an asthmatic episode at home or in the emergency department (National Asthma Education and Prevention Program, 2007).
TABLE 32-3
ESTIMATING SEVERITY OF ASTHMA EXACERBATIONS
note: Hypoventilation develops more rapidly in children than adults or adolescent.
From National Asthma Education and Prevention Program: Expert Panel Report 3: Guidelines for diagnosis and management of asthma, Bethesda, Md, 2007, National Heart, Lung, and Blood Institute, National Institutes of Health.
Successful home management of acute asthma begins before symptoms develop. All patients and family members should learn how to monitor symptoms to recognize early signs of deterioration. Children with moderate to severe persistent asthma and those with a history of severe exacerbations should learn how to monitor their peak flow rate to assess the severity of the exacerbation and the response to therapy. All children should be given a written action plan to follow in the event of symptoms or an exacerbation. This plan should include information on how to adjust medications in response to signs, symptoms, and peak flow measurements and when to seek medical help. School-age children should have a written action plan that is appropriate for the school setting.
Status Asthmaticus: Status asthmaticus is a medical emergency that can result in respiratory failure and death if unrecognized and untreated. Children who continue to display respiratory distress despite vigorous therapeutic measures, especially the use of sympathomimetics (e.g., albuterol, epinephrine), are in status asthmaticus. The condition may develop gradually or rapidly, often coincident with complicating conditions, such as pneumonia or a respiratory virus, which can influence the duration and treatment of the exacerbation.
Therapy for status asthmaticus is aimed at improving ventilation, decreasing airway resistance and relieving bronchospasm, correcting dehydration and acidosis, allaying child and parent anxiety related to the severity of the event, and treating any concurrent infection. Humidified oxygen is recommended and should be given to maintain an oxygen saturation greater than 90%. Inhaled aerosolized short-acting β2-agonists are recommended for all patients. Three treatments of β2-agonists spaced 20 to 30 minutes apart are usually given as initial therapy, and continuous administration of β2-agonists may be initiated. A systemic corticosteroid (oral, IV, or IM) may also be given to decrease the effects of inflammation. An anticholinergic such as ipratropium bromide may be added to the aerosolized solution of the β2-agonist. Anticholinergics have resulted in additional bronchodilation in patients with severe airflow obstruction. An IV infusion is often initiated to provide a means for hydration and to administer medications. Correction of dehydration, acidosis, hypoxia, and electrolyte disturbance is guided by frequent determination of arterial pH, blood gases, and serum electrolytes.
Additional therapies in acute asthma attacks include the use of IV magnesium sulfate, a potent muscle relaxant that decreases inflammation and improves pulmonary function and peak flow rate among pediatric patients treated in the emergency department with moderate to severe asthma. Heliox may be administered to decrease airway resistance and thereby decrease the work of breathing; it can be delivered via a nonrebreathing face mask from premixed tanks, which may be blended in a stand-alone unit or within a ventilator. It may be used in acute exacerbations as an adjunct to β2-agonist and IV corticosteroid therapy to improve pulmonary function until the two latter medications have time to take full effect in decreasing bronchospasm; the effects of heliox are usually seen within 20 minutes of administration, whereas other drugs may take longer to exert the desired effect. Ketamine, a dissociative anesthetic, is believed to cause smooth muscle relaxation and decrease airway resistance caused by severe bronchospasm in acute asthma (Linzer, 2007); it may be administered as an adjunct to other therapies mentioned previously.
Antibiotics should not be used to treat acute asthma attacks except when a bacterial infection resulting from another condition such as pneumonia or sinusitis is present (National Asthma Education and Prevention Program, 2007).
A child suspected of having status asthmaticus is usually seen in the emergency department and is often admitted to a pediatric intensive care unit for close observation and continuous cardiorespiratory monitoring. A key component in the prevention of morbidity is helping the child, parents, teachers, coaches, and other adults recognize features of deteriorating respiratory status, use the correct rescue drugs effectively, and immediately place the child with deteriorating respiratory status into the care of trained health care professionals instead of waiting to see if the asthma gets better on its own. The child going into early status asthmaticus is no different from the adult who is having an acute myocardial infarction in terms of needing trained medical assistance before the condition deteriorates to irreversible respiratory failure and possible death. Community education regarding asthma recognition and management is an important component of nursing care.
Prognosis: According to recent Centers for Disease Control and Prevention (2009c) data, 9.1% of U.S. children ages birth to 17 years, or 6.7 million children, were reported to have asthma. Although deaths from asthma have been relatively uncommon since the 1980s, the rate of death from asthma increased steadily in the United States until it peaked in the mid-1990s. Asthma-related deaths decreased between 1996 and 2005 by approximately 3.9% per year (Akinbami, Moorman, Garbe, et al, 2009). Data for the year 2008 indicate a significant increase in asthma symptoms, emergency department visits, and hospitalization among boys from birth to 4 years of age. Mortality and morbidity for asthma are especially high among African-American children, whose hospitalization and death rates are three times higher than those of Caucasian and Hispanic children (Liu, Covar, Spahn, et al, 2007). Most asthma deaths in children occur in the home, school, or community before lifesaving medical care can be administered.
The outlook for children with asthma varies widely. Some children’s asthma symptoms may improve at puberty, but up to two thirds of children with asthma continue to have symptoms through puberty and into adulthood. The prognosis for control or disappearance of symptoms varies in children from those who have rare and infrequent attacks to those who are constantly wheezing or are subject to status asthmaticus. In general, when symptoms are severe and numerous, when symptoms have been present for a long time, and when there is a family history of allergy, there is a greater likelihood of a poor prognosis. Risk factors that may predict persistence of symptoms into childhood (from infancy) include atopy, male gender, exposure to environmental tobacco, and maternal history of asthma. Many children who outgrow their exacerbations continue to have airway hyperresponsiveness and cough as adults. Furthermore, airway hyperresponsiveness in adults appears to be associated with decreased lung function.
The adolescent age-group appears to be the most vulnerable, with the greatest increase in mortality from the condition occurring in children 10 to 14 years of age. No reliable data exist to explain this increase. Factors that have been postulated include exposure of atopic persons to more allergens (particularly in large urban centers), change in severity of the disease, abuse of drug therapy (toxicity), failure of families and practitioners to recognize the severity of asthma, and psychologic factors such as denial and refusal to accept the disease.
Risk factors for asthma deaths include early onset, frequent attacks, difficult-to-manage disease, adolescence, history of respiratory failure, psychologic problems (refusal to take medications), dependency on or misuse of asthma drugs (high use), presence of physical stigmata (barrel chest, intercostal retractions), and abnormal PFTs.
Acute Asthma Care: Children who are admitted to the hospital with acute asthma are ill, anxious, and uncomfortable. The progression or resolution of status asthmaticus is variable. Continual observation and assessment are essential (see Nursing Care Plan).
Nursing Care Plan—The Child with Asthma
When β2-agonists and corticosteroids are given, the child is monitored closely and continuously for relief of respiratory distress and signs of side effects (tachycardia, restlessness, irritability, hyperactivity). Although food may not be well tolerated in the acute phase, the child may avoid upset stomach associated with β-agonists by taking small amounts of a food, such as a few crackers, once the respiratory status has stabilized somewhat. Pulse oximetry is monitored along with rate and depth of breathing, auscultation of air movement, adventitious sounds, and any signs of respiratory distress (e.g., nasal flaring, tachypnea, retractions). The child on supplemental oxygen requires intermittent or continuous oxygenation monitoring depending on severity of respiratory compromise and initial oxygenation status. The child in status asthmaticus should be placed on continuous cardiorespiratory (including blood pressure) and pulse oximetry monitoring.
IV access is usually initiated once the child has been placed on oxygen. The child may respond well to topical pain management for the procedure. Oral fluid intake may be limited during the acute phase; IV fluid replacement may be required to provide adequate tissue hydration. Endotracheal intubation equipment should be readily available. Medications administered intravenously are monitored for their desired effect and for any untoward effects.
Children with acute asthma are apprehensive and anxious, and they often hyperventilate as a result of the anxiety. Calm coaching to increase depth and slow rate of respirations while administering oxygen with a simple mask may alleviate the child’s fears. The calm, efficient presence of a nurse helps reassure the child that he or she is safe and will be cared for during this stressful period. Assure children that they will not be left alone and that their parents are allowed to remain with them.
Parents need reassurance and want to be informed of their child’s condition and therapies. They may believe that they have in some way contributed to the child’s condition or could have prevented the episode. Reassurance regarding their efforts expended on the child’s behalf and their parenting capabilities can help alleviate their stress. Efforts to reduce parental apprehension also reduce the child’s distress. Anxiety is easily communicated to the child from parents and members of the staff.
General Care: The nursing care of the child with asthma begins with a review of the child’s health history; the home, school, and play environment; parent and child attitudes about the child’s condition; and a comprehensive physical assessment with focus on the respiratory system. Nursing care of children with asthma involves both acute and long-term care. Nurses who are involved with children in the home, hospital, school, outpatient clinic, or practitioner’s office play an important role in helping children and their families learn to live with the condition. The disease can be managed so that it does not require hospitalization or interfere with family life, physical activity, or school attendance. The nursing process in the care of the child with asthma is outlined in the Nursing Care Plan.
Physical assessment of asthma involves the same observations and techniques described in Chapter 6. In addition, the nurse notes and evaluates physical characteristics of chronic respiratory involvement, including chest configuration (e.g., barrel chest), posturing (tripod), and type of breathing. A history of the current and previous episodes and precipitating factors or events provides important information.
Nurses may perform a variety of functions in asthma care, including asthma education in the primary care setting and in schools and other community settings, care of the child with asthma in the acute care setting, ambulatory care, and intensive care. Nurses also obtain information on how asthma affects the child’s everyday activities and self-concept, the child’s and family’s adherence to the prescribed therapy, and their personal treatment goals. Make every effort to build a partnership between the child and family and the health care team. Communication is an essential part of this partnership, and health care providers should routinely assess the effectiveness of patient-provider communication. In particular, assess the child’s and family’s satisfaction with asthma control and with the quality of care. The nurse should also assess their perception of the severity of the disease and their level of social support.
One of the major emphases of nursing care is outpatient management by the family. Parents are taught how to avoid allergens (especially tobacco smoke), recognize and respond to symptoms of bronchospasm, maintain health and prevent complications, and promote normal activities. The child’s asthma action plan should be reviewed periodically at least every 6 months in children with moderate to severe disease; precipitating factors, illness management, and medication use should be discussed. The nurse should determine any cultural or ethnic beliefs or practices that influence self-management and that may necessitate modifications in educational approaches to meet the family’s needs.
Avoid Allergens: One goal of asthma management is avoidance of an exacerbation. Parents need to know how to avoid allergens that precipitate asthma episodes. The nurse assists the parent in modifying the environment to reduce contact with the offending allergen(s). Caution the parents to avoid exposing a sensitive child to excessive cold, wind, or other extremes of weather; smoke; sprays; or other irritants. Parents should also eliminate from the diet any foods known to provoke symptoms.
Approximately 2% to 6% of children with asthma are sensitive to aspirin; therefore nurses should caution parents to use other analgesic-antipyretic drugs for discomfort or fever and to read package labeling. Although aspirin is rarely given to children in the United States, salicylate compounds are in other common medicines such as Pepto-Bismol. Children with aspirin-induced asthma may also be sensitive to NSAIDs and tartrazine (yellow dye number 5, a common food coloring).
Teach parents to avoid administering aspirin to any child because of its association with Reye syndrome unless specifically recommended by and under the supervision of a health practitioner. Acetaminophen is safe for children and is the analgesic of choice.
Relieve Bronchospasm: Teach parents and older children to recognize early signs and symptoms of an impending attack so that it can be controlled before symptoms become distressing. Most children can recognize prodromal symptoms well before an attack (about 6 hours) and implement preventive therapy. Objective signs that parents may observe include rhinorrhea, cough, low-grade fever, irritability, itching (especially in front of the neck and chest), apathy, anxiety, sleep disturbance, abdominal discomfort, and loss of appetite.
The peak expiratory flow rate (PEFR) measures the maximum flow of air that can be forcefully exhaled in 1 second. PEFR is measured in liters per minute using a peak expiratory flow meter (PEFM). Three zones of measurement are typically used to interpret PEFR. The zone system is patterned after a traffic light to make the categories easy to understand and remember (see Nursing Care Guidelines box). Each child needs to establish his or her personal best value. A personal best value should be established during a 2- to 3-week period when the child’s asthma is stable. During this period the child records the PEFR at least twice a day. After the personal best value has been established, the child’s current PEFR on any occasion can be compared with the personal best value. PEFR monitoring can be used for short-term monitoring, managing exacerbations, and daily long-term monitoring.
Because measurement of PEFR depends on effort and technique, children need instructions, demonstrations, and frequent reviews of technique (see Family-Centered Care box). Each individual child’s PEFR varies according to age, height, sex, and race.
A variety of easy-to-use, inexpensive PEFMs are available for use in the home and at school to assess changes in pulmonary function. In general, children 5 years of age and older are able to use a PEFM successfully. However, young children need to be supervised while they are learning to use their PEFM, and their technique should be checked frequently to ensure it is correct. Children should use the same PEFM over time, and they should bring it for use at every follow-up visit. Using the same brand of meter is recommended because different brands can give significantly different values. The use of a PEFM provides objective monitoring regarding the severity of asthma and can decrease asthma episodes, health care visits, and missed school days (Burkhart, Rayens, Revelette, et al, 2007).
Children who use a nebulizer, MDI, Diskus, or Turbuhaler to deliver drugs need to learn how to use the device correctly. The MDI device delivers medication directly to the airways; therefore the child needs to learn to breathe slowly and deeply for better distribution to narrowed airways (see Family-Centered Care box).
Young children and those who are unable to manipulate the MDI or hold their breath for 10 seconds should use a spacer. In infants and small children a mask may be used to facilitate delivery of the medication. These devices allow the parent or child to deliver the medication from the MDI into the spacer, from which the child then inhales the medication while taking slow steady breaths. Spacers also prevent yeast infections in the mouth when corticosteroids are inhaled via an MDI.
The nurse also needs to caution the child and parents about the adverse effects of prescribed drugs and the dangers of overuse of β2-agonists. They should know that it is important to use these drugs when needed but not indiscriminately or as a substitute for avoiding the symptom-provoking allergen. Caution parents against purchasing over-the-counter preparations because these medications can place the children at risk for increased dosage of a drug and toxicity.
The family should obtain a PEFM and learn to use this device to monitor the child’s asthma. A written asthma action plan that includes the three peak flow meter zones and the child’s asthma medications may be obtained from the child’s primary care provider (Fig. 32-13). A home asthma action plan may reduce the risk of asthma death by 70% (Liu, Covar, Spahn, et al, 2007). Medications used for asthma exacerbations are also included in the asthma plan. This action plan should be used to make decisions about asthma management at home and at school. The nurse may assist the child and family in preparing this plan, emphasizing that they, and not the health professionals, determine the success of the plan.
Fig 32-13 Asthma action plan. (Redrawn from the National Asthma Education and Prevention Program, National Heart, Lung and Blood Institute: Asthma management and prevention: global initiative for asthma. NIH Publication No. 96-3659A, Washington, DC, 1995, National Institutes of Health.)
Teach parents how to read labels on prepared foods and snacks to determine the presence of allergens.
Maintain Health and Prevent Complications: The child should be protected from a respiratory tract infection that can trigger an attack or aggravate the asthmatic state, especially in young children whose airways are mechanically smaller and more reactive. Annual influenza vaccinations are recommended for children with persistent asthma (American Academy of Pediatrics, 2009b). Equipment used for the child, such as nebulizers, must be kept absolutely clean to decrease the chances of contamination with bacteria and fungi.
Teach and encourage breathing exercises and controlled breathing for motivated children, and provide information concerning activities that promote diaphragmatic breathing, side expansion, and improved mobility of the chest wall. Play techniques that can be used for younger children to extend their expiratory time and increase expiratory pressure include blowing cotton balls or a Ping-Pong ball on a table, blowing a pinwheel, blowing bubbles, or preventing a tissue from falling by blowing it against the wall.
Promote Self-Care and Normalization: Self-care and asthma self-management programs are important in helping the child and family cope with asthma. Most asthma self-management programs for children convey several principles. First, asthma is a common disease that can be controlled with appropriate drug therapy, environmental control, education, and management skills. Second, it is much easier to prevent than to treat an asthma episode; adherence to a therapeutic program is necessary to prevent exacerbations. Third, children with asthma can live full and active lives.
Asthma camps provide an opportunity for children with asthma to engage in physical activity while learning about their disease in a controlled environment with their peers and health professionals. Children who attend asthma camps often demonstrate improved asthma self-management skills.
Self-contained programs and brochures for patient education are available from the Asthma and Allergy Foundation of America* and the American Lung Association.† The National Heart, Lung, and Blood Institute‡ provides educational materials for asthma education in the school setting and also copies of the Guidelines for the Diagnosis and Management of Asthma for the practitioner (National Asthma Education and Prevention Program, 2007). Another publication designed for health care practitioners, Pediatric Asthma: Promoting Best Practice, can be obtained from the American Academy of Allergy Asthma and Immunology.§
Child and Family Support: The nurse working with children with asthma can provide support in a number of ways. Many children voice frustration because their exacerbations interfere with their daily activities and social lives. They need education about what to do to prevent an asthma episode. These children also need reassurance from the health team that they can learn to control and cope with their asthma and live a normal life. Be aware of children, especially adolescents, who demonstrate signs of depression and may not comply with therapy as a means of passive suicide.
Children in disruptive family situations (divorce, separation, violence, custodial battles) may disregard daily asthma medication regimen or may be at higher risk as a result of neglect by adults who are in charge of their care. Adolescents struggling with a sense of identity and body image often regard asthma as a condition that will “go away,” especially if there is a time lapse between symptoms, and may abandon the therapeutic regimen. In some cases adolescents find themselves in charge of other siblings in blended family situations and may ignore their own health needs. Referral for counseling and guidance is appropriate when the child’s or adolescent’s life is potentially in danger and the therapeutic regimen for asthma is abandoned due to other crises.
The short- and long-term adaptation of children with asthma often depends on the family’s acceptance of the disorder. The task of living day-to-day with affected children involves the entire family. There are periodic crises and the ever-present threat of a crisis, requiring parental vigilance; sleepless nights; frequent trips to the physician, emergency department, or hospital; and often overwhelming medical expenses. Throughout these stresses, encourage parents to promote as normal a life as possible for their children.
CF is a condition characterized by exocrine (or mucus-producing) gland dysfunction that produces multisystem involvement. CF is the most common lethal genetic illness among Caucasian children, adolescents, and young adults. It is estimated that 1 in 29 Caucasians in the United States is a symptom-free carrier. More than 95% of the documented cases of CF occur in Caucasians (1 in 3500 live births); the incidence in other ethnic groups varies, affecting African-Americans in 1 in 15,000 live births, and Asian-Americans in 1 in 31,000 life births (Boat and Acton, 2007; Strausbaugh and Davis, 2007).
Critical Thinking Exercise—Cystic Fibrosis Inheritance Risks
CF is inherited as an autosomal recessive trait. The affected child inherits the defective gene from both parents, with an overall incidence of 1:4. The mutated gene responsible for CF is located on the long arm of chromosome 7. This gene codes a protein of 1480 amino acids called the cystic fibrosis transmembrane regulator (CFTR). The CFTR protein is related to a family of membrane-bound glycoproteins. The glycoproteins constitute a cAMP-activated chloride channel and also regulate other chloride and sodium channels at the surfaces of the epithelial cells.
Functional expression of the CF defect reduces the ability of the epithelial cells in the airways and pancreas to transport chloride. Abnormal transport of sodium and chloride across the epithelium leads to increased viscosity of airway mucus, abnormal mucociliary clearance, and lung disease. The severity of lung disease and presence of hepatic disease cannot be predicted by genotype, which suggests a major environmentally acquired component of organ system dysfunction or another gene that modifies the CF phenotype (Boat and Acton, 2007).
The ΔF508 gene mutation is the most common alteration found in CF. It occurs in 70% of all known CF chromosomes and is closely related to pancreatic insufficiency. Most of the remaining cases of CF are explained by more than 1500 other mutations. CFTR may be divided into six classes based on the type of defect. Individuals in the first three classes have more severe pulmonary disease and pancreatic insufficiency, whereas those in classes 4 and 5 have milder pulmonary symptoms and better weight gain. However, the researchers emphasize that even within each class there is substantial phenotype variability (McKone, Emerson, Edwards, et al, 2003; Strausbaugh and Davis, 2007).
With the discovery of the CFTR gene, research is continuing to determine its multisystem effects on the body. Several unrelated clinical features characterize CF: increased viscosity of mucous gland secretions, a striking elevation of sweat electrolytes, an increase in several organic and enzymatic constituents of saliva, and abnormalities in autonomic nervous system function. Although both sodium and chloride are affected, the defect appears to be primarily a result of abnormal chloride movement; the CFTR appears to function as a chloride channel.
Children with CF demonstrate decreased pancreatic secretion of bicarbonate and chloride and an increase in sodium and chloride in both saliva and sweat. This last characteristic is the basis for the sweat chloride diagnostic test. The sweat electrolyte abnormality is present from birth, continues throughout life, and is unrelated to the severity of the disease or the extent to which other organs are involved. The sodium and chloride content of sweat in 98% to 99% of children with CF is two to five times greater than that of the controls.
The primary factor, and the one responsible for many of the clinical manifestations of the disease, is mechanical obstruction caused by the increased viscosity of mucous gland secretions (Fig. 32-14). Instead of forming a thin, freely flowing secretion, the mucous glands produce a thick, heavy mucoprotein that accumulates and dilates them. Small passages in organs such as the pancreas and bronchioles become obstructed as secretions precipitate or coagulate to form concretions in glands and ducts.
Because of the increased viscosity of bronchial mucus, there is greater resistance to ciliary action (probably secondary to infection and ciliary destruction); a slower flow rate of mucus; and incomplete expectoration, which also contributes to the mucus obstruction. This retained mucus serves as an excellent medium for bacterial growth. Reduced oxygen–carbon dioxide exchange causes variable degrees of hypoxia, hypercapnia, and acidosis. In severe, progressive lung involvement, compression of pulmonary blood vessels and progressive lung dysfunction frequently lead to pulmonary hypertension, cor pulmonale, respiratory failure, and death.
Pulmonary complications are present in almost all children with CF, but the onset and extent of involvement are variable. Symptoms are produced by stagnation of mucus in the airways, with eventual bacterial colonization leading to destruction of lung tissue. The abnormally viscous and tenacious secretions are difficult to expectorate and gradually obstruct the bronchi and bronchioles, causing scattered areas of bronchiectasis, atelectasis, and hyperinflation.
The most common pathogens are P. aeruginosa, Burkholderia cepacia, S. aureus, H. influenzae, Escherichia coli, and K. pneumoniae. The pseudomonal strains are particularly pathogenic for children with CF because in most patients the alveolar macrophages cannot destroy Pseudomonas organisms. The pseudomonal strains also quickly develop resistance to most medications by developing mucoid strains, and once a person with CF is colonized with these organisms, they are difficult to eradicate. B. cepacia is especially worrisome, since this organism is extremely virulent, produces bacteremia, and has been associated with rapid pulmonary function deterioration and death in a significant number of CF patients (Boat and Acton, 2007).
P. aeruginosa infection is not specific for CF but occurs much more frequently in CF than in other diseases characterized by chronic airway obstruction. The patient develops multiple antibodies to the bacteria, which are ineffective in controlling infection; the host is able to tolerate large concentrations of bacteria without overt evidence of worsening.
Gradual progression of pulmonary disease follows chronic infection. Bronchial epithelium is destroyed, and infection spreads to peribronchial tissues, resulting in weakening of bronchial walls and peribronchial fibrosis. The pattern is chronic, progressive fibrosis with decreased oxygen–carbon dioxide exchange and a concurrent alteration in pulmonary vasculature. Chronic hypoxemia causes contraction and hypertrophy of medial muscle fibers in pulmonary arteries and arterioles, leading to pulmonary hypertension and eventual cor pulmonale. Pneumothorax may occur when peripheral bullae rupture; hemoptysis can occur with the erosion of bronchial arteries into a bronchus.
The paranasal sinuses are often filled with secretions and inflammatory products. Nasal and sinus polyps are common, sometimes resulting in bone erosion (Boat and Acton, 2007). Treatment for chronic sinusitis may involve oral antibiotics, decongestants, nasal saline lavage, and nasal corticosteroids.
The extent of gastrointestinal involvement varies. In the pancreas of many patients, thick secretions block the ducts, leading to cystic dilations of the acini (small lobes of the gland), which then undergo degeneration and progressive diffuse fibrosis. This event prevents essential pancreatic enzymes from reaching the duodenum, which causes marked impairment in the digestion and absorption of nutrients, particularly fats, proteins, and, to a lesser degree, carbohydrates. Disturbed absorption is reflected in excessive stool fat (steatorrhea) and protein (azotorrhea).
The endocrine function of the pancreas often remains unchanged because the islets of Langerhans are normal but may decrease in number as pancreatic fibrosis progresses. The incidence of diabetes mellitus (cystic fibrosis–related diabetes [CFRD]) is greater in CF children than in the general population (Balinsky and Zhu, 2004), which may be caused by changes in pancreatic architecture and diminished blood supply over time. Consequently, with increased survival, and primarily in adolescents and adults, type 1 diabetes is becoming a more frequent finding. There is no relationship between the progression of pulmonary disease and the development of diabetes mellitus in CF.
In the liver, focal biliary obstruction and fibrosis are common and become more extensive with time, eventually giving rise to a distinctive type of multilobular biliary cirrhosis. Some children develop extensive liver involvement with fatty infiltration despite adequate nutrition. The gallbladder is small and contains a firm, gelatinous material that also fills the cystic duct. Findings similar to those in the pancreas are found in the salivary glands and contribute to a dry mouth and susceptibility to infection as a result of interference with salivation.
The glands of the uterine cervix are often filled with mucus, and copious amounts of mucus may block the cervical canal. More than 95% of males have obliteration or atresia of the epididymis, vas deferens, and seminal vesicles (Boat and Acton, 2007).
The clinical manifestations vary widely and change as the disease progresses. The most common symptoms are (1) progressive chronic obstructive lung disease associated with infection; (2) maldigestion from exocrine pancreatic insufficiency; (3) growth failure from malabsorption and anorexia; and (4) diabetes symptoms of hyperglycemia, polyuria, glycosuria, and weight loss from pancreatic insufficiency. The usual pattern is one of growth failure (failure to thrive) with an increased weight loss despite an increased appetite, and gradual deterioration of the respiratory system. The diagnosis may not be readily apparent, especially when there is no familial evidence of CF. Some children display symptoms at birth. Others may not develop symptoms for weeks, months, or years. Some show only mild forms of the disease, with limited impairment of digestion and respiratory problems, whereas others have severe malabsorption and life-threatening pulmonary complications. Although most affected children display both pulmonary and gastrointestinal symptoms, a few have only enzyme deficiency without pulmonary disease, and a few have only pulmonary disease without pancreatic insufficiency.
Respiratory Tract: Initial pulmonary manifestations are often wheezing respirations and a dry, nonproductive cough. Eventually diffuse bronchial and bronchiolar obstruction leads to irregular aeration with progressive pulmonary disturbance and secondary infection. The most prominent and constant feature of pulmonary involvement is chronic cough. Dyspnea increases, the cough often becomes paroxysmal, and the mucoid impactions within the small air passages cause a generalized obstructive hyperinflation and patchy areas of atelectasis.
Progressive pulmonary involvement with hyperaeration of functioning alveoli produces the overinflated, barrel-shaped chest in which the anteroposterior diameter approaches the lateral diameter. Bronchiectatic cysts and subpleural blebs in the upper lobes occur in advanced disease and may rupture, causing pneumothorax (Boat and Acton, 2007). When ventilation and subsequent diffusion and gas exchange are significantly impaired, cyanosis and clubbing of the fingers and toes may occur. The child or adolescent has repeated episodes of bronchitis and bronchopneumonia and is subject to chronic nasal congestion, rhinitis, chronic sinusitis, and nasal polyps. The incidence of ENT surgeries is higher in this group of children when compared with the general population.
Gastrointestinal Tract: The earliest postnatal manifestation of CF is meconium ileus, which occurs in 15% to 20% of newborns with the disease (Boat and Acton, 2007). Thick, puttylike, tenacious, mucilaginous meconium blocks the lumen of the small intestine, usually at or near the ileocecal valve, which gives rise to signs of intestinal obstruction, including abdominal distention, vomiting, failure to pass stools, and rapid development of dehydration with associated electrolyte imbalance. Thick intestinal secretions continue to be problematic throughout life. Children of all ages are subject to intestinal obstruction (distal ileum) from heavy or impacted feces. Gumlike masses in the cecum can obstruct the bowel, causing pain, nausea, and vomiting. This is referred to as meconium ileus equivalent. Distal intestinal obstruction syndrome is the name given to a partial or complete intestinal obstruction that occurs in some children with CF.
As the disease progresses, obstruction of pancreatic ducts prevents digestive enzymes (trypsin, chymotrypsin, amylase, lipase) from being released into the duodenum, which prevents conversion of ingested food into compounds that can be absorbed by the intestinal mucosa. Consequently, the undigested food (chiefly unabsorbed fats and proteins) is excreted, increasing the bulk of feces to two or three times the normal amount. The bulky nature of the stools may go unnoticed at first, but usually by 6 months of age the child passes large, loose stools with normal frequency or has chronic diarrhea with unformed stools. As solid foods are added to the diet, the excessively large stools become frothy and extremely foul smelling.
Because so little is absorbed from the intestine, affected children have difficulty maintaining weight despite a healthy appetite and diet. Unable to compensate for the fecal losses, many children lose weight and exhibit marked wasting of tissues and growth failure. The abdomen is distended, the extremities are thin, and the sallow skin droops from wasted buttocks. The impaired ability to absorb fats results in a deficiency of the fat-soluble vitamins A, D, E, and K, which may cause bleeding problems if vitamin K deficiency is significant. Anemia is a common complication. Growth failure may be an initial diagnosis in young children with previously undiagnosed CF. Many older children with CF have an increased prevalence of gastroesophageal reflux.
Another common gastrointestinal complication is prolapse of the rectum, which occurs in infancy and early childhood and is related to large, bulky stools; malnutrition; and increased intraabdominal pressure secondary to paroxysmal cough. Appendicitis, intussusception, and volvulus may also occur more frequently in children with CF (Hazle, 2010).
Reproductive System: Delayed puberty in girls with CF is common even when their nutritional and clinical status is good. CF affects the reproductive systems of both males and females. Females with CF have normal fallopian tubes and ovaries. Fertility can be inhibited by highly viscous cervical secretions, which act as a plug, blocking sperm entry. Women with CF who become pregnant have an increased incidence of premature labor and delivery and low birth weight in the infant. Favorable nutritional status and pulmonary function are positively correlated with favorable pregnancy outcomes. Most adult men (approximately 95%) with CF are sterile, which may be caused by blockage of the vas deferens with abnormal secretions or by failure of normal development of the wolffian duct structures (vas deferens, epididymis, and seminal vesicles), resulting in decreased or absent sperm production.
Integumentary System: The consistent finding of abnormally high sodium and chloride concentrations in the sweat is a unique characteristic of CF. Parents frequently observe that their infants taste “salty” when they kiss them. The chloride channel defect in sweat glands prevents reabsorption of sodium and chloride, which leaves the affected person at risk for abnormal salt loss, dehydration, and hypochloremic and hyponatremic alkalosis during hyperthermic conditions. This is especially important to the infant because of limited fluid stores and the potential for inadequate sodium intake with most commercially prepared infant formulas.
The disease is sometimes expressed in other ways (e.g., hyponatremia caused by massive losses through sweat, especially in high environmental temperatures or febrile episodes). Infants with CF who have growth failure frequently demonstrate hypoalbuminemia resulting from diminished absorption of protein, which in severe cases causes generalized edema.
Traditionally the diagnosis of CF was based on a positive sweat chloride test, absence of pancreatic enzymes, radiography, chronic obstructive pulmonary disease, and family history. Newer diagnostic methods make it possible to diagnose CF early in infancy so therapies can be implemented to increase the child’s overall survival and quality of life. In addition to the sweat chloride test and factors listed previously, diagnosis may be confirmed by any one of the following: newborn screening, deoxyribonucleic acid (DNA) identification of mutant genes, and abnormal nasal potential difference measurement.
The quantitative sweat chloride test (pilocarpine iontophoresis) involves stimulating the production of sweat with a special device (involving stimulation with 3-mA electric current), collecting the sweat on filter paper, and measuring the sweat electrolytes. The quantitative analysis requires a sufficient volume of sweat (>75 mg). Two separate samples are collected to ensure the reliability of the test. Normally sweat chloride content is less than 40 mEq/L, with a mean of 18 mEq/L. A chloride concentration greater than 60 mEq/L is diagnostic of CF; in infants younger than 3 months a sweat chloride concentration greater than 40 mEq/L is highly suggestive of CF. In some situations DNA testing may be substituted for the sweat test. The presence of a mutation known to cause CF on each CFTR gene predicts with a high degree of certainty that the individual has CF; however, multiple CFTR mutations may also be present and detected with DNA assay.
Chest radiography reveals characteristic patchy atelectasis and obstructive emphysema. PFTs are sensitive indices of lung function, providing evidence of abnormal small airway function in CF. Other diagnostic tools that may aid in diagnosis include stool fat or enzyme analysis. Stool analysis requires a 72-hour sample with accurate recording of food intake during that time. Radiographs, including barium enema, are used for diagnosis of meconium ileus.
In some cases CF may go undiagnosed until the child is older and is seen with clinical manifestations that previously were not acute. Ten percent of new CF diagnoses made in 2007 were in children over 10 years old (Cystic Fibrosis Foundation, 2009a).
Universal newborn screening for CF has been proposed yet remains controversial, since many states lack the resources for such screening programs. In 2009 all but two states offered some type of CF newborn screening (National Newborn Screening and Genetics Resource Center, 2009). The Centers for Disease Control and Prevention (2004) emphatically recommends newborn screening for CF. In one study infants with early diagnosed CF had asymptomatic lung disease and bacterial infection (S. aureus and P. aeruginosa). Children who were identified and treated early in infancy with aggressive nutritional support had improved height and weight well into adolescence (Sly, Brennan, Gangell, et al, 2009).
The newborn screening test consists of an immunoreactive trypsinogen (IRT) analysis performed on a dried spot of blood, which may be followed by direct analysis of DNA for the presence of the ΔF508 mutation or other mutations on the same dried blood spot. Benefits of early screening and detection include earlier nutritional intervention and preservation of lung function for identified infants (Farrell, Rosenstein, White, et al, 2007; Linnane, Hall, Nolan, et al, 2008; Southern, Merelle, Dankert-Roelse, et al, 2009). Perceived disadvantages to early screening include the parental anxiety false-positive results may generate. Although the technology is available to conduct carrier screening for the general population, this issue remains controversial, and widespread implementation of carrier screening programs is not recommended. An in utero diagnosis of CF is also possible based on detection of two CF mutations in the fetus.
Improved survival among patients with CF during the past two decades is attributable largely to antibiotic therapy and improved nutritional management. Goals of CF therapy are to (1) prevent or minimize pulmonary complications, (2) ensure adequate nutrition for growth, (3) encourage appropriate physical activity, and (4) promote a reasonable quality of life for the child and family. To attain these goals, health care providers use a multidisciplinary system approach to treatment. Current research and modern technologies are exploring methods to attack the genetic defect. For example, a number of clinical trials are underway to examine the feasibility of correcting the underlying genetic defect using gene therapy. Evidence-based guidelines for the management of infants with CF have recently been published elsewhere (Borowitz, Robinson, Rosenfeld, et al, 2009).
Management of Pulmonary Problems: Direct management of pulmonary problems toward prevention and treatment of pulmonary infection by improving ventilation, removing mucopurulent secretions, and administering antimicrobial agents. Many children develop respiratory symptoms by 3 years of age. The large amounts and viscosity of respiratory secretions in children with CF contribute to the likelihood of respiratory tract infections. Recurrent pulmonary infections in the child with CF result in greater the damage to the airways; small airways are destroyed, causing bronchiectasis.
The most common pathogens responsible for pulmonary infections are P. aeruginosa, B. cepacia, S. aureus, H. influenzae, E. coli, and K. pneumoniae. P. aeruginosa and B. cepacia are particularly pathogenic for children with CF, and infections with these organisms are difficult to clear. In addition, children with CF who are chronically colonized with these organisms have poorer survival rates than children who are not colonized (Boat and Acton, 2007). Colonization and infection with methicillin-resistant S. aureus (MRSA) has recently emerged as a critical factor in lung infection and pulmonary function in patients with CF. Patients with MRSA required longer hospitalization and multiple antibiotic regimens (Ren, Morgan, Konstan, et al, 2007). Fungal colonization with Candida or Aspergillus organisms in the respiratory tract is also common in CF patients.
Airway Clearance Therapy: Prevention of pulmonary infection involves a daily routine of CPT to maintain pulmonary hygiene. (See Chapter 31.) CPT is usually performed on average twice daily (on rising and in the evening) and more frequently if needed, especially during pulmonary infection. The Flutter mucus clearance device is a small, hand-held plastic pipe with a stainless-steel ball on the inside that facilitates removal of mucus (Fig. 32-15). It has the advantages of increasing sputum expectoration and being used without assistance. Hand-held percussors and mechanical percussors may be used to loosen secretions. Another method to clear mucus is high-frequency chest compression, in which the child temporarily wears a mechanical vest device that provides high-frequency chest wall oscillation. Some children and adolescents with an implantable port may experience localized pain with the vest.
Patients with CF have been found to regress when conventional CPT is discontinued. Therefore, although it is time consuming for the child and family, CPT remains the cornerstone of pulmonary therapy. Forced expiration, or “huffing,” with the glottis partially closed helps move secretions from the small airways so that subsequent coughing can move secretions forcefully from the large airways. This maneuver enhances the pulmonary function of patients with CF. Autogenic drainage involves a variety of breathing techniques, which the older child can use to force mucus in lower lobes up into the airways so it can be successfully expelled. Another mucus-clearing technique involves use of a positive expiratory pressure mask; this technique involves breathing into a mask attached to a one-way valve, which creates resistance—as the patient exhales, the airway is kept open by the pressure and mucus is forced into the upper airway for expulsion.
Bronchodilator medication delivered in an aerosol opens bronchi for easier expectoration and is administered before CPT when the patient exhibits evidence of reactive airway disease or wheezing. Another aerosolized medication is recombinant human deoxyribonuclease (DNase, known generically as dornase alfa [Pulmozyme]), which decreases the viscosity of mucus. It is well tolerated and has no major adverse effects; minor reactions are voice alterations and laryngitis. This medication, given once or twice daily via nebulization, has resulted in improvements in spirometry, PFTs, dyspnea scores, and perceptions of well-being and has reduced the viscosity of sputum (Redding, 2009). Nebulized hypertonic saline (6% to 7%) has been shown to be effective in improving airway hydration and increases mucus clearance in patients with CF; this treatment, however, causes bronchospasm and may not be recommended for patients with severe disease (Redding, 2009; Rowe and Clancy, 2006). Clinical trials are in progress to examine the effects of inhaled dry powdered mannitol for improving mucociliary clearance in CF by rehydrating the airway (Minasian, Wallis, Metcalfe, et al, 2008).
Physical exercise is an important adjunct to daily CPT. Exercise stimulates mucus excretion and provides a sense of well-being and increased self-esteem. Any aerobic exercise that the patient enjoys should be encouraged. The ultimate aim of exercise is to increase lung vital capacity, remove secretions, increase pulmonary blood flow, and maintain healthy lung tissue for effective ventilation.
Colonization with P. aeruginosa and B. cepacia signals progressive involvement. Although the bacteria are impossible to eradicate, they can be successfully controlled. Inhaled antibiotics are administered as a prophylactic measure in some centers, but once the organisms have become established, antibiotic therapy is most effective when given intravenously. Patients with CF metabolize antibiotics more rapidly than normal; therefore drug dosage is often higher than would be expected. Depending on its sensitivity, P. aeruginosa is usually treated with aminoglycosides in combination with antipseudomonal β-lactam antibiotics (ticarcillin, piperacillin, ceftazidime). Antibiotic treatment of B. cepacia should be based on susceptibility and synergy testing. The duration of therapy depends on the patient’s response, measured by clinical indicators, including cough, fatigue, and exercise intolerance, in addition to tests such as PFTs, chest radiography, and oxygen and carbon dioxide measurements.
Pulmonary infections are treated as soon as they are recognized. In CF patients characteristic signs of pulmonary infection—fever, tachypnea, and chest pain—may be absent. Therefore a careful history and physical examination are essential. The presence of anorexia, weight loss, and decreased activity alert the practitioner to pulmonary infection and the need for an antibiotic regimen (Boat and Acton, 2007). Aerosolized antibiotics such as tobramycin, ticarcillin, and gentamicin are beneficial for patients with frequent pulmonary exacerbations (Redding, 2009). These medications are usually administered by jet or ultrasonic nebulizers after CPT is performed. This type of delivery system allows for direct antimicrobial application with little systemic absorption. It is not uncommon for the hospitalized child with CF to be placed on as many as two or three antibiotics and one antifungal medication to treat coexisting pulmonary infections.
IV antibiotics may be administered at home as an alternative to hospitalization. The use of peripherally inserted central catheters (PICCs) for the administration of antibiotics in children with CF is a viable option with limited complications and fewer needle punctures to obtain blood specimens and to maintain often lengthy treatment with parenteral antibiotics (Tolomeo and Mackey, 2003). Alternatively, an implanted port offers the advantage of access for blood draws and antibiotic infusion. Patients may receive antibiotic therapy at home and continue daily activities with minimum disruptions. However, when pulmonary function does not improve with outpatient management, hospitalization may be recommended for continued antibiotic therapy and vigorous CPT and postural drainage. Oxygen administration is used for children with acute episodes but must be used cautiously because many children with CF have chronic carbon dioxide retention, and the unsupervised use of oxygen can be harmful. (See Oxygen Therapy, Chapter 31.) With repeated infection and inflammation, bronchial cysts and emphysema may develop. These cysts may rupture, resulting in a pneumothorax (see Box 32-10).
Blood streaking of the sputum is usually associated with increased pulmonary infection and often requires no specific treatment. Hemoptysis greater than 250 ml/24 hr for the older child (less for a younger child) indicates a potentially life-threatening event and needs to be treated immediately. Sometimes bleeding can be controlled with bed rest, IV antibiotics, replacement of acute blood loss, IV conjugated estrogens (Premarin) or vasopressin (Pitressin), and correction of any coagulation defects with vitamin K or fresh frozen plasma. If hemoptysis persists, the site of bleeding should be localized via bronchoscopy and cauterized or embolized.
Children and adolescents with CF should be given the age-appropriate immunizations, including the annual influenza virus vaccine. The trivalent inactivated influenza virus vaccine is appropriate for such individuals.
Treatment of nasal polyps includes intranasal corticosteroids, oral antihistamines, and decongestants. If these measures are ineffective, surgical interventions may be necessary.
Because pulmonary damage in patients with CF is believed to be caused by the inflammatory process that occurs with frequent infections, the use of corticosteroids has been studied; however, treatment with corticosteroids found only a modest efficacy and numerous side effects, including linear growth restriction, glucose tolerance abnormalities, and cataract formation (Boat and Acton, 2007). Antiinflammatory medications such as the NSAID ibuprofen have shown significant benefits particularly in younger patients with mild disease (Boat and Acton, 2007). Long-term daily ibuprofen given in a dose sufficient to achieve a peak plasma concentration between 50 and 100 mcg/ml has been shown to slow the rate of decline in pulmonary function and to decrease the need for IV antibiotics in young patients with mild pulmonary involvement Although this therapy is generally well tolerated, careful monitoring for adverse effects (gastrointestinal bleeding) is essential (Boat and Acton, 2007).
Lung transplantation is a final therapeutic option for many CF patients with severe disease. Heart-lung and double-lung procedures have been successfully performed in children with advanced pulmonary vascular disease and hypoxia; however, whether such procedures significantly improve quality of life and survival rates in children with CF is debated in the current literature. Some experts state that infections such as B. cepacia represent a negative factor for long-term survival after transplant (Kotloff, 2009; Liou, Adler, Cox, et al, 2007). Data show that 5-year survival in adults with CF and without B. cepacia is less than 50% (Kotloff, 2009). The obstacles surrounding this technique are availability of donated organs; complications from surgery; and recurrence of pulmonary infections and obstructive bronchiolitis, which decreases transplanted lung function. Living-donor lobar transplantation is an alternative to cadaveric transplantation for those who might otherwise succumb to pulmonary and cardiac failure while waiting for a transplant (Goldberg and Deykin, 2007).
Management of Gastrointestinal Problems: The principal treatment for pancreatic insufficiency is replacement of pancreatic enzymes, which are administered with meals and snacks to ensure that digestive enzymes are mixed with food in the duodenum. Enteric-coated products prevent the neutralization of enzymes by gastric acids, thus allowing activation to occur in the alkaline environment of the small bowel. The amount of enzymes depends on the severity of the insufficiency, the child’s response to enzyme replacement, and the practitioner’s philosophy. Usually one to five capsules are administered with a meal, and fewer are taken with snacks. Capsules can be swallowed whole or taken apart, and the contents sprinkled on a small amount of food to be taken at the beginning of the meal. The amount of enzyme is adjusted to achieve normal growth and a decrease in the number of stools to one or two per day. Pancreatic enzymes should be taken within 30 minutes of eating. The enteric-coated beads should not be chewed or crushed, since destroying the enteric coating can lead to inactivation of the enzymes and excoriation of oral mucosa. The powder form should be used cautiously because inhalation of the powder may precipitate acute bronchospasm. Enzymes are mixed into cereal or fruit such as applesauce for small children.
One issue of concern with pancreatic enzymes is that generic enzymes are not considered adequate and only proprietary enzymes should be given to children with CF (Stallings, Stark, Robinson, et al, 2008). Because the uptake of fat-soluble vitamins is decreased, water-miscible forms of these vitamins (A, D, E, and K) are given, along with multivitamins and the pancreatic enzymes. When high-fat foods are eaten, the child is encouraged to add extra enzymes.
Children with CF require a well-balanced, high-protein, high-caloric diet, with unrestricted fat (because of the impaired intestinal absorption). Improved nutrition in children with CF has been associated positively with improved lung function. To meet his or her energy requirements, the patient with minimal pulmonary disease must consume 5% to 10% more than the recommended dietary allowance (RDA); for those with severe lung disease energy requirements may be as high as 20% to 50% or more of the RDA (American Academy of Pediatrics, 2009a). A group of experts recently recommended that children and adolescents with CF 2 to 20 years of age have an energy intake of 110% to 200% of standards for healthy persons (Stallings, Stark, Robinson, et al, 2008). Regular nutritional monitoring should be a standard part of the medical care of the child with CF and should occur every 3 to 4 months (American Academy of Pediatrics, 2009a). Breast-feeding with enzyme supplementation should be continued whenever possible and, when necessary, supplemented with a higher-calorie-per-ounce (e.g., 24 kcal/oz) formula. For formula-fed infants, commercial cow’s milk–based formulas may be adequate to achieve desired growth, but additional caloric intake may be required. In older children with CF three daily meals and three snacks are recommended to meet energy and growth requirements (American Academy of Pediatrics, 2009a).
Growth failure despite adequate nutritional support may indicate deterioration of pulmonary status. Data indicate that better forced expiratory volume in 1 second (FEV1) status (≥80%) strongly correlates with body mass index percentiles above 50th percentile; therefore the target weight for children with CF 2 to 20 years old should be ideally maintained above the 50th percentile (Stallings, Stark, Robinson, et al, 2008). A persistent weight loss over 6 months to 1 year or persistent malnutrition requires aggressive nutritional therapy to prevent declining pulmonary and general physical health status (American Academy of Pediatrics, 2009a). Patients with CF may experience frequent anorexia as a result of the copious amounts of mucus produced and expectorated, persistent cough, effect of medications, fatigue, and sleep disruption. They may be placed on nighttime (or continuous) supplemental gastrostomy feedings or parenteral alimentation in an effort to build up nutritional reserves if there has been a history of inability to maintain weight. Enzyme supplement is encouraged with gastrostomy feedings; these may be given at the initiation of the infusion, at bedtime, and at the conclusion of the feeding infusion (American Academy of Pediatrics, 2009a).
Meconium ileus and meconium ileus equivalent, or total or partial intestinal obstruction, can occur at any age. Constipation is often the result of a combination of malabsorption (either from inadequate pancreatic enzyme dosage or a failure to take the enzymes), decreased intestinal motility, and abnormally viscous intestinal secretions. These problems usually do not require surgical interventions and may be treated with GoLYTELY or Colyte (osmotic solutions given orally or by nasogastric tube), other laxatives, stool softeners, or rectal administration of diatrizoate meglumine (Gastrografin).
Rectal prolapse occurs in a small number of children with CF. The first episode of rectal prolapse is frightening to both parents and child. Its reduction usually requires immediate guidance and intervention, which is managed by simply guiding the rectum back into place with a gloved, lubricated finger with the child lying on her or his side. Further management usually involves attempting to decrease the bulk of daily stools through pancreatic enzyme replacement.
Children with CF often experience transient or chronic gastroesophageal reflux, which should be treated with the appropriate histamine-receptor antagonist and gastrointestinal motility drug, dietary modifications, and an upright position after feedings or meals (Hazle, 2010).
Management of Endocrine Problems: The management of CFRD is critical in the therapeutic treatment of the child with CF. CFRD presents a combination of insulin resistance and insulin deficiency, with unstable glucose homeostasis in the presence of acute lung infection and treatment. Children with CFRD require close monitoring of blood glucose, administration of oral glucose-lowering agents or insulin injections, and diet and exercise management; children with CF may be at increased risk for glucose management problems as a result of decreased nutrient absorption, anorexia, and severity of pulmonary illness. The prevalence of CFRD increases with age, and there is increased morbidity and mortality among children with CFRD compared to those without (Strausbaugh and Davis, 2007). Microvascular complications such as retinopathy and nephropathy may occur in children and adolescents with CFRD (Schwarzenberg, Thomas, Olsen, et al, 2007). However, ketoacidosis is reported to be rare in individuals with CFRD (Boat and Acton, 2007).
Bone health is of concern in children and adults with CF. The pancreatic insufficiency of CF and chronic steroid use present potential risks for less than optimum bone growth in such children. Assessment of bone health by history and bone mass density evaluation should be considered in assessing the child’s (≥8 years old) health status to detect and prevent osteoporosis or osteopenia (Borowitz, Baker, and Stallings, 2002).
The administration of growth hormone (somatropin [Nutropin]) is being investigated as a nutritional adjunct in children with CF to achieve optimum growth; one small study sample suggests an improvement in CF clinical status (Hardin, Rice, Ahn, et al, 2005). One randomized study indicates that the drug is well tolerated but does not result in short-term improvement of FEV in CF patients (Schnabel, Grasemann, Staab, et al, 2007).
Prognosis: In 1966 the median life expectancy for individuals with CF was 7.5 years. The median survival age for the CF patient in 2008 was 37.4 years, and approximately 45% of all patients with CF are 18 years old and older (Cystic Fibrosis Foundation, 2009b).
Lung, heart, pancreas, and liver transplantation have increased survival rates among some CF patients. Heart-lung and double-lung procedures have been successfully performed in children with advanced pulmonary vascular disease and hypoxia. In 2008 estimates of 5-year survival after transplantation were approximately 60% (Hazle, 2010). The obstacles surrounding this technique are availability of donated organs; complications from surgery; pulmonary infections; and recurrence of obstructive bronchiolitis, which decreases transplanted lung function.
Despite considerable progress and a recent surge in new treatment modalities, CF remains a progressive and incurable disease. The pulmonary involvement ultimately determines the patient’s outcome because pancreatic enzyme deficiency is less of a problem if adequate nutrition is ensured. With advances in technology, parents and adolescents are challenged to set future goals that may include college, careers, social relationships, and marriage. Concurrently they are faced with increasing morbidity and higher rates of CF complications as they grow older.
Assessment of the child with CF involves comprehensive assessment of all affected systems with special focus on pulmonary and gastrointestinal systems. Pulmonary assessment is the same as that described for asthma, with special attention to lung sounds, observation of cough, and evidence of decreased activity or fatigue. Gastrointestinal assessment primarily involves observing the frequency and nature of the stools and abdominal distention. The observer is also alert to evidence of growth failure (e.g., weight loss, muscle wasting, pallor, anorexia, decreased activity [from baseline norm]). Family members are interviewed to determine the child’s eating and eliminating habits and confirm a history of frequent respiratory tract infections or bowel obstruction in infancy.
The nurse assesses the newborn for feeding and stooling patterns, which may indicate a potential problem such as meconium ileus. The nurse also participates in diagnostic testing such as the initial newborn screening, IRT, DNA analysis, or sweat chloride test.
Parents are often anxious and puzzled about the diagnostic tests and the possible implications of the test results. They need careful explanations of the disease, how it might affect their family, and what they can do to provide the best possible care for their child. It is crucial to involve the parents in the follow-up for early diagnostic testing; the neonate may require several follow-up visits in the first few weeks of life if initial test results are not conclusive.
The uncertainty, fear, and initial shock associated with the diagnosis are overwhelming to parents. They must face the impact of the chronic, life-threatening nature of the disease and the prospect of intensive treatment, for which they must assume a major part of the responsibility and for which they are ill prepared. They often fear that they will be unable to provide the care the child needs.
Hospital Care: Most patients with CF require hospitalization only for treatment of pulmonary infection, uncontrolled diabetes, or a coexisting medical problem that cannot be treated on an outpatient basis. Therefore, when patients with CF are hospitalized, implement Standard Precautions with meticulous hand washing to decrease the nosocomial spread of organisms to the CF patient and between hospitalized CF patients (especially when MRSA is prevalent). Contact Precautions may be required for specific infections.
When the child with CF is hospitalized for diagnosis or treatment of pulmonary complications, aerosol therapy, chest percussion therapy, and postural drainage are instituted or continued. Respiratory therapists often initiate, supervise, and provide these treatments; however, it is the nurse’s responsibility to monitor the patient’s tolerance to the procedure and evaluate its effectiveness in relation to treatment goals. The nurse may at times administer aerosol therapy, perform CPT, assist with airway clearance interventions such as the mechanical vest, and teach breathing exercises. CPT should not be performed before or immediately after meals. Planning CPT so that it does not coincide with meals is difficult in the hospital situation but is essential to the effectiveness of this treatment.
Administer supplemental oxygen therapy to the child with mild or moderate respiratory distress, and assess the child’s tolerance to the procedure. Noninvasive pulse oximetry provides valuable data about the patient’s oxygenation status, but nursing assessments, including observation of respiratory pattern, work of breathing, and lung auscultation, are vital.
One of the nursing challenges in the care of the child with CF is encouraging compliance with the therapeutic medication regimen, which often involves a significant number of medications; pancreatic enzymes; vitamins A, D, E, and K; oral antifungals for Candida infection; antihistamines; antiinflammatory agents; and oral antibiotics. This may be overwhelming to the child. Factor in multiple inhaled bronchodilators, CPT and aerosol treatments, blood glucose monitoring and insulin administration, various other medications, and increased mucus production during the acute phase, and it is not uncommon for the child with CF to rebel and be noncompliant with this regimen.
Gentle coaxing, positive reinforcement, and frank negotiation may be required to enlist cooperation for effective medication compliance. The child’s sleep is disrupted frequently by hospital routines; therefore nursing care should be flexible enough to allow him or her some quiet time without affecting vital care. In some cases a daily schedule of events, including medication administration, CPT, aerosolized therapy, and dressing changes, may need to be mutually developed with the child, nurses, and physician so that the child feels he or she has some control of the care.
The diet for the child with CF represents another challenge; careful planning with a pediatric dietitian and the child’s input may help decrease the loss of appetite and weight loss that are often part of the condition. Patients with CF, especially adolescents, enjoy foods brought from home or an occasional fast food of choice (provided these meet therapeutic requirements). Children in the early stages of CF often have a good appetite. With infection and increased lung involvement, their appetite diminishes, and eventually it becomes a challenge to tempt failing appetites. Age-appropriate nutrition education with specific nutritional goals for CF patients may increase compliance with prescribed enzyme therapy and nutritional supplements (Pitts, Flack, and Goodfellow, 2008).
When dietary intake fails to meet the child’s needs for growth, enteral feedings or supplements may be considered (Borowitz, Baker, and Stallings, 2002). These feedings may be administered via gastrostomy tube during the night to minimize the disruption of daily activities, including school. Additional pancreatic enzymes are required with supplemental feedings to obtain best results. A skin-level feeding gastrostomy affords the child few activity restrictions and minimum disruption of body image in comparison to a nasogastric tube or conventional gastrostomy tube. The child and parents are encouraged to perceive this therapy not as a last-ditch effort but as an adjunct therapy to maintain optimum growth and prevent excessive weight loss (Borowitz, Baker, and Stallings, 2002). In some cases adolescents are taught to insert a nasogastric tube for nighttime supplemental feedings; the tube may then be removed in the morning.
The child needs support during the many treatments and tests that are a part of the hospitalization. IV fluids, IV antibiotics and antifungals, and blood tests are almost always a part of the acute care treatment, and the child soon associates hospitalization with these stress-provoking procedures.
Providing support to both the child and the family is essential. The progressive nature of the disease makes each illness requiring hospitalization a potentially life-threatening event. Skilled nursing care and sympathetic attention to the emotional needs of the child and family help them cope with the stresses associated with repeated respiratory tract infections and hospitalizations.
The child or adolescent who is immobilized as a result of CF requires the same care and attention as the child with immobility from any other chronic or acute illness, including skin care, bowel management, passive range of motion, and positioning.
Home Care: Most children and adolescents with CF can be managed at home. The goals of care include normalization and daily activities, including school and peer involvement. The care plan should be flexible so that family activities are disrupted as little as possible. Parents may initially require assistance finding and contacting durable medical equipment companies that provide home care equipment. They also need opportunities to learn how to use the equipment and to solve problems they may encounter while delivering therapy at home. The many aspects of home care for the child with CF are similar to those of home care for other children. (See Chapter 25.)
Patients and family members need education about the preferred diet of nutritious meals with tolerated fat, increased protein and carbohydrate, and the administration of pancreatic enzymes. For infants and young children, the enzymes can be mixed with pureed fruit such as applesauce and fed with a spoon. Capsules are usually suitable for older children. It is important to stress to parents that the enzymes, in the amount regulated to the child’s needs, should be administered at the beginning of all meals and snacks.
One of the most important aspects of educating parents for home care is teaching techniques for airway clearance (CPT, mechanical vest, forced expiration) and breathing exercises. The success of a therapy program depends on conscientious performance of these treatments regularly as prescribed. The number of times these therapies are performed each day is determined on an individual basis, and often parents readily learn to adjust the number and intensity of the treatments to the child’s needs. For pulmonary infection, home IV antibiotics may be prescribed. Home IV care may be preferred for willing and competent families, since it reduces tension and usually brings a sense of belonging to the family members; however, this option depends on a number of factors, including availability of an agency with adequate staff to perform multiple daily home antibiotic infusions. With use of the venous access devices such as PICC lines and implanted ports, the parents and child learn the technique of direct administration into the IV line. Around-the-clock administration may be difficult for families and requires certain adjustments such as waking at least once during the night to give the drug.
For the child or adolescent with chronic sinusitis, daily nasal lavage with sterile normal saline may be helpful. Caution parents to avoid commercial saline preparations with benzyl alcohol, since these may burn the nasal mucosa (Manning, 2005). A dental jet irrigator may be used or a bulb syringe to inject the saline into the paranasal sinuses; slightly tilt the child’s head back for instillation, then have the child lean forward to drain the saline into an emesis basin or the bathroom sink. Adolescents need instruction on performing this procedure themselves.
Families also need information about medications and possible side effects. If a child is receiving ibuprofen, serum drug levels need to be monitored closely to establish therapeutic dosages, and observations for side effects such as gastrointestinal irritation are essential.
Children and adolescents with CF should receive routine primary care with special attention to diet, growth and development, and immunizations. Primary care providers should be alert to any weight loss or flattening in the growth curve associated with loss of appetite, which could indicate a pulmonary exacerbation in children with CF (Hazle, 2010). In addition to all the recommended routine immunizations, CF patients should be immunized against influenza starting at age 6 months and followed by an annual booster (American Academy of Pediatrics, 2009b). Anticipatory guidance concerning issues of discipline, how to incorporate aspects of the treatment regimen into the school environment, and delayed pubertal development are also important considerations for the primary care provider.
Home palliative care for the child or adolescent with CF who is in the terminal stages may be carried out with the assistance of hospice. (See Chapter 23.)
The nurse can assist the family in contacting resources that provide help to families with affected children. Various special child health services, many local clinics, private agencies, service clubs, and other community groups offer equipment and medications either free or at reduced rates. The Cystic Fibrosis Foundation* has chapters throughout the United States to provide education and services to families and professionals.
Family Support: The most challenging aspect of providing care for the family of a child or adolescent with CF is meeting the emotional needs of the child and family. The diagnosis, treatment, and prognosis for CF are often associated with many problems and frustrations. The diagnosis can evoke feelings of guilt and self-recrimination in parents.
The long-range problems for an infant, child, or adolescent with CF are those encountered in any chronic illness. (See Chapter 22.) Both the child and the family must make many adjustments, the success of which depends on their ability to cope and also on the quality and quantity of support they receive from outside sources. Combined efforts of a variety of health professionals are needed to provide the most comprehensive services to families. It is often the nurse who assesses the home situation, organizes and coordinates these services, and collects the data needed to evaluate the effectiveness of the services.
The persistent need for treatment several times a day places tremendous strain on the family. When the child is young, a family member must perform postural drainage and CPT. Children often balk at these treatments, and the parents are in the position of insisting on adherence. The stress and anxiety related to this routine may produce feelings of resentment in both the child and the family members. When possible, occasional trusted respite care should be available to allow parents to leave the situation for short periods without undue anxiety about the child’s welfare.
The affected child or adolescent may become resentful about the disease, its relentless routine of therapy, and the necessary restrictions it places on activities and relationships. The child’s activities are interrupted or built around treatments, medications, and diet. This imposes hardships and influences his or her quality of life. The nurse should encourage the child to attend school and join age-appropriate peer groups to live as normally and productively as possible. Sports are often an important part of the child’s and adolescent’s life; interaction with peers is a valuable life experience, especially to adolescents. The child or adolescent with CF should be encouraged to participate in sports activities as much as physical and pulmonary health allows. Exercise is encouraged to increase pulmonary vital capacity, promote muscle development, and enhance cardiovascular function.
Depression, anxiety, and disturbed self-image may occur in children and adolescents with CF; young adults with severe symptoms may be especially prone to depression as they face the poor prognosis and the reality of unmet life expectations and goals. Nurses should monitor adolescents with CF for signs of eating disturbances. One study found that 24% of the adolescents in the study group had eating disturbance, but most did not fit the criteria for anorexia or bulimia (Bryon, Shearer, and Davies, 2008). One study found that psychologic problems, including depression and anxiety, increased in adult CF patients with disease progression (Shanmugam, Bhutani, Khan, et al, 2007).
As the disease progresses, however, family stress should be expected, and the patient may become angry and noncompliant. It is important for the nurse to recognize the family’s changing needs and the grief they may experience as the CF worsens. Families should be made aware of resources for counseling. Patients need to be guided into activities that enable them to express anger, sorrow, and fear without guilt.
Transition to Adulthood: As life expectancy continues to rise for children and adolescents with CF, issues related to marriage, sexuality, childbearing, and career choice become more pressing. Males must be informed at some point that they will often be unable to produce offspring. It is important that the distinction be made between sterility and impotence. Normal sexual relationships can be expected. Female patients may be able to bear children but should be informed of the possible harmful effects on the respiratory system created by the burden of pregnancy. They also need to know that their children will be carriers of the CF gene; therefore genetic counseling for those planning on having children is essential. Adolescent females should be offered counseling concerning the use of oral contraceptives and other contraceptive options (Hazle, 2010).
Adolescents with CF should take personal ownership and management of the illness to maximize their life’s potential. Many adolescents and young persons with the illness enroll in college or vocational and technical training school and complete degrees by either distance learning or attending a local school. Young people should set life goals and live normal lives to the extent their illness allows. Adolescents who have had lung transplantation are encouraged to continue taking antirejection medications even though they may feel as though their respiratory status has improved to the point that these medications are no longer necessary.
Life as an independent adult should be encouraged for children with CF. From the time that children can take partial responsibility for their own care (e.g., CPT and taking enzymes), independence and accountability should be fostered. Although the prognosis for these children has improved, many will need continued support as they cope with the demands of surviving with CF.
Anticipatory grieving and other aspects related to care of a child with a terminal illness are also part of nursing care. For example, it is important to prepare the child and family members for end-of-life decisions and care. Families may need information about specific interventions such as hospice and treatments for pain and dyspnea. (See Chapter 23.)
Pediatric obstructive sleep-disordered breathing reportedly affects between 10% and 12% of children ages 2 to 8 years; obstructive sleep may occur in as many as 2% of all children (Benninger and Walner, 2007). However, Au and Li (2009) suggest that the true prevalence of obstructive sleep apnea syndrome (OSAS) is between 1% and 4%. Obstructive sleep-disordered breathing is said to form a continuum of respiratory conditions that are exacerbated during sleep and, if left untreated, may result in significant morbidity (Au and Li, 2009). Sleep-disordered breathing problems in this spectrum range from partial obstruction of the upper airway to continuous episodes of complete upper airway obstruction, with the most severe form being OSAS (Benninger and Walner, 2007).
Obstructive sleep apnea is defined by the American Thoracic Society (1996) as a disorder of breathing during sleep with prolonged partial upper airway obstruction and/or complete obstruction that disrupts normal respiration during sleep and normal sleep patterns. The American Academy of Pediatrics (2002) published a clinical practice guideline for the diagnosis and management of OSAS in children; this discussion focuses only on obstructive sleep apnea syndrome as defined by the academy (2002).
Adenotonsillar hypertrophy has been postulated to be the main cause of OSAS, but some have suggested there may also be an impaired central nervous system response to mechanical stimulation of the respiratory system because many children without tonsils and adenoids continue to have OSAS (Au and Li, 2009). OSAS in children is a distinctly separate condition from OSAS in adults with regard to etiology, clinical manifestations, and treatment (Au and Li, 2009).
Common symptoms of OSAS include nightly snoring, interrupted or disturbed sleep patterns, enuresis, and daytime neurobehavioral problems (American Academy of Pediatrics, 2002; Chan, Edman, and Koltai, 2004). OSAS is to be distinguished from primary snoring, which is snoring without obstructive apnea, frequent sleep arousals, or abnormalities in gas exchange (American Academy of Pediatrics, 2002). Interestingly, children with OSAS do not exhibit daytime sleepiness as do adults; the exception may be obese children (Chan, Edman, and Koltai, 2004). If left untreated, OSAS may result in complications such as growth failure, cor pulmonale, hypertension, poor attention span, hyperactivity, behavioral problems, attention deficit hyperactivity disorder, and death.
The diagnosis of OSAS is made by an overnight sleep study (polysomnography), which provides evidence of sleep disturbance, respiratory pauses, and changes in oxygenation. The six-channel polysomnography can be performed in children of all ages with videotaping or audiotaping, and abbreviated (versus full-night sleep study) polysomnography may be useful; however, this latter method does not predict the severity of OSAS (American Academy of Pediatrics, 2002). Polysomnography can distinguish between OSAS and primary snoring (Owens, 2007).
A common treatment for OSAS in children is T&A (adenotonsillectomy), provided there is evidence of adenotonsillar hypertrophy (Benninger and Walner, 2007; Owens, 2007). Cure rates following adenotonsillectomy are reported to range between 75% and 100% in normal healthy children (Owens, 2007). Complications of these surgical interventions are discussed previously in this chapter. Continuous positive airway pressure (CPAP) and bilevel (cycles between high and low pressure) positive airway pressure (BiPAP) may be helpful in older children with OSAS whose condition persists after surgical intervention. CPAP is a long-term therapy with frequent assessments to evaluate the required amount of pressure and the overall effectiveness of the intervention.
Surgical interventions such as tracheotomy or mandibular distraction may be required for children with craniofacial syndromes such as Goldenhar, Pierre Robin, Apert, and Crouzon, in which there is partial or complete upper airway obstruction (Chan, Edman, and Koltai, 2004; Owens, 2007).
Nursing care of the child with OSAS involves early detection by observation of the infant’s or child’s sleep patterns and active participation in the diagnostic polysomnography. Important nursing roles are inserting the pH probe into the esophagus, ensuring accurate placement by radiography, and monitoring the sleep study and the patient’s response to diagnostic therapy. Counseling families of children with OSAS may involve dietary counseling for exercise programs and weight management, use of the CPAP or BiPAP equipment, and direct postoperative care after the surgical intervention of tonsillectomy or adenoidectomy. The nurse can be instrumental in helping the child and family cope with the chronic illness diagnosis should intervention such as CPAP or BiPAP be required.
• Acute infection of the respiratory tract is the most common cause of illness in infancy and childhood.
• The incidence and severity of respiratory tract infections are influenced by the infectious agent involved, the child’s age, and the child’s natural defenses.
• Symptoms of respiratory tract infections include fever, anorexia, vomiting, abdominal pain, nasal blockage and discharge, wheezing, cough, adventitious respiratory sounds, and sore throat.
• Common respiratory tract infections of childhood include acute nasopharyngitis, acute pharyngitis, influenza, tonsillitis, and OM.
• Severe bleeding from the tonsil site can occur within 6 hours to 5 to 10 days after tonsillectomy.
• Factors that predispose children to OM are the shape and position of eustachian tubes, undeveloped cartilage lining, abundant pharyngeal lymphoid tissue, immature humoral defense mechanisms, exposure to tobacco smoke, and the recumbent position (in infants) for feeding.
• The most common URIs are categorized as croup syndromes, which include acute LTBI, acute spasmodic laryngitis, and acute epiglottitis.
• Epiglottitis is a medical emergency and is characterized by fever, anxious appearance, stridor, and difficulty swallowing.
• The primary nursing function in the care of children with croup is observation for signs of respiratory (airway) compromise and relief of anxiety.
• Lower airway conditions constitute the majority of respiratory problems in children and are usually viral in nature (excluding FB aspiration).
• Common infections of the lower airway include bacterial tracheitis, asthmatic bronchitis, bronchitis, bronchiolitis, and pneumonia.
• Pneumonias are generally classified either by site (lobar, bronchial, or interstitial) or by etiologic agent (viral, bacterial, mycoplasmal, or associated with FBs).
• Management of uncomplicated bronchiolitis and viral pneumonia is symptomatic in otherwise healthy infants.
• In TB, resistance to the bacillus can be altered by heredity, gender, age, stress states, poor nutrition, intercurrent infection, and noncompliance with therapy.
• Signs of choking include inability to speak, color change, and decreased level of activity.
• Inhaled objects are rarely coughed up spontaneously; therefore they must be removed by direct bronchoscopy or laryngoscopy.
• Inducing a child to vomit is contraindicated in the event of hydrocarbon ingestion because of the danger of hydrocarbon aspiration.
• Asthma is the leading cause of chronic illness in children.
• General therapeutic management of asthma includes allergen control, drug therapy, exercise, and sometimes hyposensitization.
• Support for the family of the child with asthma includes education about the disease and its therapy and facilitation of self-management.
• CF is the most frequently occurring inherited disease of Caucasian children and is transmitted by an autosomal recessive gene located on chromosome 7.
• Diagnosis of CF may be based on a number of criteria, including family history, absence of pancreatic enzymes, chronic pulmonary involvement, laboratory identification of CF mutations, positive newborn screening test, and abnormally high sweat chloride concentration (pilocarpine test [or sweat test]).
1. Yes, there are sufficient data to arrive at a possible conclusion in this situation.
2. a. Epiglottitis is a serious obstructive inflammatory process that occurs in children 2 to 5 years of age.
b. Symptoms of epiglottitis include throat pain, restlessness, drooling, and a desire to sit upright and lean forward.
c. Because epiglottitis can quickly progress to severe respiratory distress, the nurse should not examine the child’s throat with a tongue depressor or take a throat culture until the child is examined by a practitioner.
d. Nursing interventions for the child with epiglottitis include monitoring the child’s respiratory status, allowing the child to remain in the position that is most comfortable, having an artificial airway (e.g., tracheotomy) and emergency equipment available, and assisting with insertion of an intravenous line and administration of antibiotics.
3. The suspicion of epiglottitis constitutes an emergency. The priority for nursing care at this time is to maintain the child’s airway.
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*A parent guide (94-0624) and more detailed clinical practice guidelines (94-0620) are available in English and Spanish from AHRQ Publications Clearinghouse, OME/AAP, PO Box 8547, Silver Spring, MD 20907; 800-358-9295; www.ahrq.gov.
*1301 Pennsylvania Ave., NW, Washington, DC 20004; 202-785-3355, 800-548-8252; www.lungusa.org.
*For a copy of the Environmental Protection Agency report Respiratory Health Effects of Passive Smoking, visit http://cfpub.epa.gov/ncea/CFM/recordisplay.cfm?deid=2835.
*8201 Corporate Drive, Suite 1000, Landover, MD 20785; 800-727-8462; www.aafa.org.
†1301 Pennsylvania Ave., NW, Washington, DC 20004; 202-785-3355, 800-548-8252; www.lungusa.org.
‡NHLBI Health Information Center, PO Box 30105, Bethesda, MD 20824-0105; 301-592-8573; fax: 240-629-3246; www.nhlbi.nih.gov.
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*6931 Arlington Road, 2nd floor, Bethesda, MD 20814-3205; 301-951-4422 or 800-344-4422; www.cff.org. In Canada: Canadian Cystic Fibrosis Foundation, 2221 Yonge St., Suite 601, Toronto, Ontario M4S 2B4; www.cysticfibrosis.ca. Two excellent publications available from the Cystic Fibrosis Foundation are What Everyone Should Know About Cystic Fibrosis, and Cystic Fibrosis: A Summary of Symptoms, Diagnosis, and Treatment. For information about specialized medications, especially dornase alfa, and equipment for CF and other pulmonary diseases, contact Cystic Fibrosis Pharmacy, HHCS Health Group, 3901 E. Colonial Drive, Orlando, FL 32803; 888-307-4427; www.cfpharmacy.com.