Acute Bronchiolitis

Acute bronchiolitis is a common respiratory condition primarily affecting infants and young children, characterized by inflammation of the bronchioles, typically caused by viral infections, most commonly respiratory syncytial virus (RSV). Key clinical points include: 1) It usually presents in children under 2 years of age; 2) Symptoms include wheezing, cough, and difficulty breathing; 3) Diagnosis is often clinical, based on history and physical examination; 4) Severity can vary, necessitating hospitalization in some cases. The pathophysiology involves viral infection leading to airway inflammation, increased mucus production, and airway obstruction. Clinical presentation often includes a preceding upper respiratory infection followed by respiratory distress, tachypnea, and hypoxia. Typical use cases for this diagnosis code include outpatient visits for respiratory distress, emergency department evaluations, and inpatient admissions for severe cases requiring supportive care.