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    Asthma is a heterogeneous condition characterized by airway hyperresponsiveness and inflammation that result in variable patterns of reversible airway obstruction with symptoms that vary over time. It occurs in approximately 10% of children. Symptoms typically are...

    Lower Respiratory Tract Infections

    Bronchiolitis, a lower respiratory tract infection, commonly affects infants and children younger than 2 years. Respiratory syncytial virus is the most common cause. Nasal congestion, rhinorrhea, and mild fever occur in the first 1 to 3 days. Symptoms worsen for several days...


    The most important issue in diagnosing stridor in infants and children is determining whether it is acute or chronic. The most common cause of acute stridor is croup, a viral infection with a straightforward diagnosis when patients have typical signs and symptoms (ie,...

    Nonasthma Chronic Lung Disease

    Bronchopulmonary dysplasia (BPD) is a chronic lung disease that results from impaired lung development or lung injury from ventilatory support. It primarily is seen in infants born prematurely. Approximately 95% of infants with BPD had a low birth weight (ie, less than 1,500...



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