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Difficulty: MediumPediatric Respiratory Disorders

A 4-year-old girl is evaluated in the emergency department for severe shortness of breath and wheezing. Her mother reports that the child developed a runny nose and a low-grade fever two days ago, which progressed to a persistent, tight cough and difficulty breathing this morning. The patient's medical history includes atopic dermatitis and allergic rhinitis, for which she uses emollients and as-needed oral antihistamines. Her immunizations are up-to-date. On arrival, her temperature is 37.3°C (99.1°F), pulse is 138/min, respirations are 44/min, and blood pressure is 95/60 mm Hg. Pulse oximetry shows 91% on room air. Physical examination reveals a distressed, tachypneic child sitting upright. There are prominent intercostal and subcostal retractions. Lung auscultation demonstrates a prolonged expiratory phase with diffuse, bilateral polyphonic wheezing. Which of the following is the most appropriate next step in management?

  1. Initiation of inhaled albuterol and oral dexamethasoneAnswer
  2. B
    Supportive care with deep nasal suctioning and observation
  3. C
    Delivery of aerosolized racemic epinephrine
  4. D
    Prescription for oral azithromycin and discharge home
  5. E
    Intravenous furosemide and bedside echocardiography

Answer

The most appropriate next step in management is the initiation of inhaled albuterol and oral dexamethasone.
This patient is presenting with a classic acute asthma exacerbation, characterized by a viral prodrome leading to acute respiratory distress, tachypnea, hypoxia, retractions, and bilateral expiratory wheezing. Her history of atopic dermatitis and allergic rhinitis places her at high risk for asthma. The most appropriate initial management for a moderate-to-severe asthma exacerbation includes supplemental oxygen (to maintain SpO2 >90-92%), inhaled short-acting beta-agonists (albuterol) for immediate bronchodilation, and early administration of systemic corticosteroids (such as oral dexamethasone or prednisone) to decrease airway inflammation and prevent relapse.

Step-by-Step Solution

1
Analyze the patient's demographics, medical history, and presenting symptoms.
The patient is a 4-year-old girl with a history of atopic dermatitis and allergic rhinitis who presents with acute respiratory distress, expiratory wheezing, and hypoxia following a viral upper respiratory infection.
Identifying the classic 'atopic march' and the viral trigger helps establish the underlying pathophysiology as reactive airway disease.
2
Differentiate the clinical findings from other common pediatric respiratory emergencies.
The age of 4 years makes bronchiolitis less likely (typically affects infants <2 years). The presence of a prolonged expiratory phase and polyphonic wheezing points to lower airway obstruction (asthma), effectively ruling out croup, which causes upper airway obstruction (inspiratory stridor).
Accurate localization of the airway obstruction (upper vs. lower) is critical to selecting the correct pharmacotherapy.
3
Determine the appropriate intervention for the established diagnosis and severity.
The patient has a severe acute asthma exacerbation, evidenced by retractions, marked tachypnea, and an oxygen saturation of 91%. She requires immediate treatment with inhaled short-acting beta-agonists (albuterol) for bronchodilation and systemic corticosteroids (dexamethasone) to reduce acute inflammation.
Delaying bronchodilators and steroids in a patient with severe asthma exacerbation and hypoxia can lead to respiratory failure.

Key Concept

Diagnosis and acute management of pediatric asthma exacerbation
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Topics

Pediatric Respiratory Disorders

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