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Difficulty: MediumPediatric Respiratory Disorders

A 6-month-old male infant, born prematurely at 3232 weeks gestation, is evaluated in the emergency department in mid-January. For the past four days, he has had profuse rhinorrhea and a low-grade fever. Today, he developed significant breathing difficulty and has been unable to breastfeed. Vital signs show a temperature of 37.8∘C37.8^\circ\text{C} (100.0∘F100.0^\circ\text{F}), heart rate of 165/min165/\text{min}, respiratory rate of 68/min68/\text{min}, and oxygen saturation of 88%88\% on room air. Physical examination reveals marked intercostal and subcostal retractions, nasal flaring, and head bobbing. Lung auscultation demonstrates diffuse coarse crackles and prolonged expiratory wheezing bilaterally. Which of the following are appropriate interventions for this patient's acute management? (Select all that apply)

  1. Initiation of heated, humidified high-flow nasal cannula oxygen therapyAnswer
  2. Provision of maintenance fluid hydration via nasogastric tube or intravenous lineAnswer
  3. C
    Scheduled administration of nebulized albuterol
  4. D
    Administration of a multi-day course of intravenous methylprednisolone
  5. E
    Initiation of empiric intravenous ceftriaxone therapy

Answer

The correct management consists of providing respiratory support with heated, humidified high-flow nasal cannula oxygen therapy and ensuring adequate hydration via a nasogastric tube or intravenous line.
The clinical picture is highly characteristic of severe viral bronchiolitis, typically caused by Respiratory Syncytial Virus (RSV). Because the infant is hypoxemic (SpO2<90%SpO_2 < 90\%) and exhibits a significantly increased work of breathing, supplemental oxygen is required. High-flow nasal cannula is advantageous because it provides both oxygen and mild continuous positive airway pressure (CPAP), which helps keep the inflamed bronchioles open. Furthermore, a respiratory rate greater than 60/min60/\text{min} precludes safe oral feeding due to a high risk of aspiration. Ensuring adequate hydration via a nasogastric tube or intravenous fluids is a mandatory component of supportive care in this setting.

Step-by-Step Solution

1
Analyze the patient's presentation and demographics to establish the diagnosis.
An infant presenting in the winter months with a viral prodrome followed by lower respiratory tract signs (tachypnea, crackles, wheezing) strongly indicates severe viral bronchiolitis.
Recognizing the classic clinical pattern prevents misdiagnosis as asthma or bacterial pneumonia, which require fundamentally different treatments.
2
Assess the severity of the respiratory compromise to determine the need for admission and intervention.
The infant exhibits impending respiratory failure (respiratory rate 68/min68/\text{min}, severe retractions) and hypoxemia (SpO2SpO_2 88%88\%).
Objective vital signs dictate the intensity of the required supportive care.
3
Select the appropriate evidence-based interventions for severe viral bronchiolitis.
Management is exclusively supportive. Oxygenation is supported with high-flow nasal cannula, and hydration is maintained enterally (via nasogastric tube) or parenterally since oral feeding is unsafe.
Guidelines emphasize supportive care over pharmacological interventions like bronchodilators or steroids, which lack efficacy in this disease process.

Key Concept

Management of severe viral bronchiolitis in infants
Estimated Time:1m 30s
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Topics

Pediatric Respiratory Disorders

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