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Difficulty: HardPediatric Infectious Diseases

A mother brings her 4-week-old infant to the pediatric emergency department during the winter season. Over the past three days, the infant has developed a progressive cough, copious clear rhinorrhea, and fast breathing. Today, the mother noticed the baby is having difficulty feeding and seems unusually lethargic. The infant was born at 39 weeks of gestation following an uncomplicated pregnancy and delivery. Family history is significant for a father with severe persistent asthma.

Vital signs reveal a temperature of 37.3°C (99.1°F), a heart rate of 152/min, a respiratory rate of 70/min, and an oxygen saturation of 91% on room air. Physical examination demonstrates an infant in moderate respiratory distress with nasal flaring and marked intercostal retractions. Auscultation reveals prolonged expiration with diffuse bilateral wheezing and fine crackles. Skin examination shows scattered, blotchy, erythematous macules with central tiny pale papules on the trunk, which the mother states have intermittently appeared and resolved since the first week of life.

Based on the clinical presentation, which of the following is the most appropriate next step in management?

  1. Admit the patient for supportive care including supplemental oxygen and hydrationAnswer
  2. B
    Administer nebulized albuterol and systemic corticosteroids
  3. C
    Obtain blood cultures and initiate empiric intravenous ampicillin and cefotaxime
  4. D
    Initiate intravenous acyclovir and place the patient in contact isolation
  5. E
    Administer the first dose of the live-attenuated rotavirus vaccine prior to admission

Answer

Admit the patient for supportive care including supplemental oxygen and hydration
The correct action is to admit the patient for supportive care including supplemental oxygen and hydration. This 4-week-old infant presents with a classic clinical picture of viral bronchiolitis, likely due to Respiratory Syncytial Virus (RSV), given the winter season, rhinorrhea, tachypnea, wheezing, and crackles. Because the infant has significant respiratory distress, hypoxemia (oxygen saturation of 91% on room air), and poor feeding, admission is required. Supportive care, consisting of supplemental oxygen (to maintain saturations >90-92%) and fluid management, is the only evidence-based intervention for typical viral bronchiolitis. Additionally, the infant's rash is erythema toxicum neonatorum (ETN), a benign, self-limiting condition characterized by erythematous macules with central eosinophil-filled papules or pustules, which requires no treatment.

Step-by-Step Solution

1
Identify the primary respiratory pathology based on age, symptoms, and season.
The combination of winter onset, rhinorrhea, tachypnea, wheezing, and crackles in a 4-week-old afebrile infant points strongly to viral bronchiolitis, most commonly caused by Respiratory Syncytial Virus (RSV).
Recognizing the classic clinical syndrome prevents unnecessary diagnostic testing and inappropriate pharmacological interventions.
2
Evaluate the description of the infant's dermatologic findings.
The finding of blotchy, erythematous macules with central tiny pale papules that wax and wane is pathognomonic for Erythema Toxicum Neonatorum (ETN), a benign, self-limited newborn rash.
Differentiating benign neonatal rashes from serious infectious vesicular rashes (like HSV) dictates whether invasive testing and antivirals are required.
3
Determine the appropriate management strategy for the diagnosed conditions.
Bronchiolitis management is strictly supportive. Because the infant has hypoxemia (O2 sat 91%), significant tachypnea (70/min), and poor feeding, hospital admission for supplemental oxygen and fluid management is indicated.
Current pediatric guidelines explicitly recommend supportive care as the only routine intervention for viral bronchiolitis, advising against the use of albuterol, steroids, and antibiotics.

Key Concept

Diagnosis and evidence-based management of viral bronchiolitis and benign neonatal dermatoses.
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Topics

Pediatric Infectious Diseases

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