A 6-week-old boy is brought to the emergency department by his parents after a witnessed 1… — USMLE Step 2 CK

A $6$ -week-old boy is brought to the emergency department by his parents after a witnessed $15$ -second episode of absent breathing associated with perioral cyanosis at home. The parents report he has had progressive nasal congestion, clear rhinorrhea, and decreased feeding over the past three days. He was born at $39$ weeks gestation with no perinatal complications. His rectal temperature is $37.7^\circ\text{C}$ ( $99.9^\circ\text{F}$ ), pulse is $165/\text{min}$ , and respirations are $70/\text{min}$ . Pulse oximetry shows an oxygen saturation of $90\%$ on room air. Physical examination reveals an appropriately grown infant with copious nasal secretions, marked subcostal and intercostal retractions, and diffuse fine crackles with scattered expiratory wheezes on auscultation. Which of the following are the most appropriate immediate steps in the management of this patient? (Select exactly two)

Admission to the hospital for continuous cardiorespiratory monitoring and fluid supportAnswer
Initiation of heated humidified high-flow nasal cannula (HFNC) or continuous positive airway pressure (CPAP)Answer
C
Administration of empiric intravenous ampicillin and gentamicin
D
Trial of nebulized albuterol to assess for clinical response
E
Administration of intravenous dexamethasone to reduce airway inflammation

Answer

Admission to the hospital for continuous cardiorespiratory monitoring and the initiation of heated humidified high-flow nasal cannula (HFNC) or continuous positive airway pressure (CPAP).

The correct answers involve admission for continuous monitoring and the initiation of noninvasive respiratory support. Viral bronchiolitis is the most common lower respiratory tract infection in infants. In infants under 2 months of age, it carries a uniquely high risk of life-threatening apnea, often presenting before the peak of respiratory symptoms. Therefore, admission for continuous cardiorespiratory monitoring is essential. Furthermore, this patient exhibits severe respiratory distress (respiratory rate of 70/min, marked retractions) and hypoxemia (SpO2 90% on room air). The standard of care for severe bronchiolitis with increased work of breathing and hypoxemia is noninvasive positive pressure ventilation, such as heated humidified high-flow nasal cannula (HFNC) or continuous positive airway pressure (CPAP), which helps stent the airways open, clear secretions, and improve oxygenation.

Step-by-Step Solution

Diagnose the patient's condition based on the clinical presentation.

The patient has severe viral bronchiolitis complicated by an apneic episode.

The combination of young age, upper respiratory symptoms, diffuse wheezing, crackles, and a witnessed apneic event is classic for RSV bronchiolitis.

Assess the severity and risk factors.

The patient is at high risk due to his age (under 2 months) and history of apnea, and currently has severe respiratory distress (SpO2 90%, RR 70/min, marked retractions).

Identifying severe disease and high-risk features dictates the need for inpatient management and advanced respiratory support.

Determine the appropriate management bundle.

Select supportive care with noninvasive respiratory support (HFNC/CPAP) and continuous monitoring, while explicitly avoiding asthma medications and antibiotics.

Evidence-based guidelines emphasize supportive care for bronchiolitis and strongly recommend against the use of albuterol, corticosteroids, and empiric antibiotics.

Key Concept

Severe viral bronchiolitis in young infants, especially those presenting with apneic episodes, requires hospital admission for continuous cardiorespiratory monitoring and noninvasive respiratory support (such as HFNC or CPAP). Bronchodilators, systemic corticosteroids, and empiric antibiotics are contraindicated in typical presentations.

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