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Difficulty: MediumPediatric Infectious Diseases

A 5-month-old boy is brought to the clinic in late January with a 3-day history of worsening nasal congestion, clear rhinorrhea, and a mild cough. Over the past 12 hours, his parents have noticed that he is breathing more rapidly than usual and appears fussy. He was born at 39 weeks gestation and has no underlying medical conditions. He has received all recommended age-appropriate vaccinations. His temperature is 37.8°C (100.0°F), pulse is 148/min, and respiratory rate is 64/min. Pulse oximetry shows 94% on room air. Physical examination reveals flaring of the nasal alae, mild subcostal retractions, and prolonged expiration. Lung auscultation demonstrates diffuse bilateral wheezing and scattered fine crackles. The remainder of the examination is unremarkable. Which of the following is the most appropriate next step in management?

  1. Supportive care with nasal suctioning and hydrationAnswer
  2. B
    Inhaled albuterol therapy
  3. C
    Oral amoxicillin
  4. D
    Oral dexamethasone
  5. E
    Chest radiography

Answer

Supportive care with nasal suctioning and hydration
The correct answer emphasizes that acute viral bronchiolitis is a self-limiting illness requiring only supportive care in the absence of severe respiratory distress or hypoxia (SpO2 < 90%). Because this 5-month-old infant is maintaining an oxygen saturation of 94% on room air and only exhibits mild increased work of breathing, interventions should be limited to optimizing upper airway patency (nasal suctioning) and ensuring adequate oral fluid intake to prevent dehydration.

Step-by-Step Solution

1
Analyze the clinical presentation and demographics.
The patient is an infant presenting in winter with a viral prodrome followed by lower respiratory tract symptoms (tachypnea, retractions, wheezing, and crackles).
Identifying the classic age (<2 years), season (winter), and physical exam findings establishes a clinical diagnosis of acute viral bronchiolitis (most commonly caused by RSV).
2
Assess the severity of the respiratory distress.
The infant is tachypneic with mild retractions, but is maintaining an oxygen saturation of 94% on room air without signs of impending respiratory failure.
Determining the severity guides whether the patient requires inpatient admission, supplemental oxygen, or can be managed with outpatient supportive care.
3
Select the appropriate evidence-based intervention.
The best step is to provide supportive care consisting of nasal suctioning and adequate hydration.
Pharmacologic interventions (bronchodilators, steroids, antibiotics) and routine imaging are not supported by current guidelines for uncomplicated bronchiolitis.

Key Concept

Diagnosis and management of acute viral bronchiolitis
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Topics

Pediatric Infectious Diseases

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