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Difficulty: MediumPediatric Infectious Diseases

A 10-week-old boy is brought to the emergency department in mid-January by his parents due to a 3-day history of nasal congestion and a worsening cough. Over the past 12 hours, he has been feeding poorly and breathing rapidly. The family recently immigrated to the United States, and the infant has not received any immunizations. His temperature is 37.9°C (100.2°F), heart rate is 156/min, respiratory rate is 68/min, and oxygen saturation is 89% on room air. On physical examination, the infant appears mildly lethargic and is using accessory respiratory muscles. Copious clear rhinorrhea is present. Lung auscultation reveals diffuse polyphonic wheezing and crackles bilaterally. Skin examination shows multiple scattered erythematous papules and pustules on his cheeks, which the parents state have been present since he was 3 weeks old. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Administer a trial of nebulized albuterol and oral dexamethasone
  2. B
    Prescribe topical acyclovir for the facial skin lesions
  3. Admit to the hospital, provide supplemental oxygen, and perform nasal suctioningAnswer
  4. D
    Obtain blood cultures and initiate intravenous ceftriaxone and vancomycin
  5. E
    Administer the live-attenuated measles, mumps, and rubella vaccine

Answer

Admit to the hospital, provide supplemental oxygen, and perform nasal suctioning
The correct answer provides the standard of care for severe viral bronchiolitis. This infant's presentation of a viral prodrome progressing to lower respiratory tract signs (wheezing, crackles, retractions) in the winter is classic for respiratory syncytial virus (RSV) bronchiolitis. Because the infant has significant respiratory distress and hypoxemia (oxygen saturation of 89%), inpatient admission for supportive care, primarily supplemental oxygen and nasal suctioning to clear copious secretions, is the most appropriate management.

Step-by-Step Solution

1
Identify the primary clinical syndrome
The infant presents with a viral prodrome followed by respiratory distress, polyphonic wheezing, and hypoxemia during the winter season, which is classic for viral bronchiolitis (most commonly due to RSV).
Accurate syndromic diagnosis prevents the administration of inappropriate medications like bronchodilators or antibiotics.
2
Assess disease severity and indications for admission
The patient has an oxygen saturation of 89%, severe tachypnea (RR 68/min), and accessory muscle use, indicating impending respiratory failure.
Hypoxemia (SpO2 < 90%) and significant work of breathing are absolute indications for inpatient supportive care, including supplemental oxygen and secretion clearance.
3
Evaluate concurrent exam findings to rule out alternative or concurrent diagnoses
The facial rash is recognized as benign neonatal cephalic pustulosis, and the temperature of 37.9°C (100.2°F) is below the 38.0°C threshold for a neonatal sepsis evaluation.
Understanding these findings avoids unnecessary diagnostic testing (like lumbar puncture or blood cultures) and prevents the initiation of empiric antimicrobial therapy.

Key Concept

Management of viral bronchiolitis in infants relies on supportive care (supplemental oxygen and nasal suctioning) while strictly avoiding ineffective medications such as bronchodilators, corticosteroids, and unnecessary broad-spectrum antibiotics.
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Topics

Pediatric Infectious Diseases

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