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Difficulty: MediumPediatric Infectious Diseases

A 5-month-old male infant is brought to the emergency department in January due to a 3-day history of nasal congestion, clear rhinorrhea, and low-grade fever. Over the last 24 hours, he has developed a persistent, wet-sounding cough and poor feeding, taking only half of his usual formula volume. His temperature is 37.8°C (100.0°F), pulse is 155/min, respiratory rate is 68/min, and oxygen saturation is 93% on room air. Physical examination reveals an irritable but consolable infant with nasal flaring and mild subcostal retractions. Auscultation of the lungs demonstrates diffuse expiratory wheezes and scattered bilateral fine crackles. There is no stridor at rest. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Administer a trial of nebulized albuterol
  2. B
    Administer nebulized racemic epinephrine
  3. Provide supportive care with nasal suctioning and fluid supplementationAnswer
  4. D
    Administer oral dexamethasone
  5. E
    Prescribe a course of oral azithromycin

Answer

Provide supportive care with nasal suctioning and fluid supplementation
The correct approach for an infant presenting with typical viral bronchiolitis is supportive care. This condition, most commonly caused by Respiratory Syncytial Virus (RSV), involves inflammation, edema, and necrosis of the epithelial cells lining the small airways, leading to mucus production and variable obstruction. High-quality evidence and pediatric guidelines emphasize that pharmacologic interventions such as bronchodilators (albuterol), corticosteroids (dexamethasone), and antibiotics do not alter the disease course or meaningfully reduce hospital admission rates. Instead, management focuses on maintaining adequate oxygenation and hydration. Nasal suctioning helps clear the upper airway—a crucial step since young infants are obligate nose breathers—and fluid supplementation addresses the poor feeding caused by respiratory distress.

Step-by-Step Solution

1
Analyze the patient's age and clinical presentation to determine the most likely diagnosis.
A 5-month-old infant with rhinorrhea, fever, wheezing, and fine crackles during winter months has the classic presentation of acute viral bronchiolitis, typically caused by Respiratory Syncytial Virus (RSV).
Establishing the correct diagnosis is critical because management pathways for pediatric respiratory distress vary significantly depending on the etiology.
2
Evaluate the severity of the illness based on vital signs and physical examination.
The patient has tachypnea (68/min), increased work of breathing (nasal flaring, retractions), and a borderline oxygen saturation (93%), indicating a mild-to-moderate case of bronchiolitis with secondary poor feeding.
Severity assessment determines whether the patient requires inpatient admission, supplemental oxygen, or can be managed with supportive care.
3
Determine the evidence-based management for this specific condition.
Pediatric guidelines strongly advise against the routine use of bronchodilators, corticosteroids, and antibiotics for a first episode of uncomplicated bronchiolitis. The recommended next step is supportive care.
Pharmacologic interventions have not been shown to alter the disease course of bronchiolitis. Supportive care directly addresses the patient's symptoms (poor feeding and upper airway congestion).

Key Concept

Management of acute viral bronchiolitis in infants
Estimated Time:1m 0s
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Topics

Pediatric Infectious Diseases

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