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Difficulty: MediumPediatric Respiratory Disorders

An 8-year-old girl is evaluated in the emergency department due to rapidly worsening shortness of breath. She has a known history of moderate persistent asthma. Two days ago, she developed rhinorrhea, a mild cough, and a low-grade fever. Over the past hour in the emergency department, she has received three consecutive nebulized albuterol-ipratropium treatments and a dose of intravenous methylprednisolone, but her work of breathing continues to increase. She is up to date on all childhood immunizations. Vital signs show a temperature of 37.4∘C37.4^\circ\text{C} (99.3∘F99.3^\circ\text{F}), a heart rate of 152/min152/\text{min}, a respiratory rate of 44/min44/\text{min}, and an oxygen saturation of 89%89\% on 4 L/min4\text{ L/min} supplemental oxygen via nasal cannula. On physical examination, she is diaphoretic, visibly fatigued, and sitting forward. There are prominent supraclavicular and intercostal retractions. Lung auscultation reveals markedly diminished air entry bilaterally without audible wheezing. Which of the following interventions are indicated as part of the immediate management bundle for this patient? (Select all that apply)

  1. Initiation of continuous nebulized albuterol therapyAnswer
  2. Intravenous administration of magnesium sulfateAnswer
  3. C
    Prescription of empiric intravenous ceftriaxone
  4. D
    Nebulization of hypertonic (3%) saline
  5. E
    Intravenous administration of furosemide

Answer

The correct interventions are the initiation of continuous nebulized albuterol therapy and the intravenous administration of magnesium sulfate.
This patient is presenting with status asthmaticus, characterized by a severe asthma exacerbation that is refractory to standard initial emergency therapy (repeated doses of short-acting beta-agonists and systemic corticosteroids). The presence of a 'silent chest' (diminished air entry without audible wheezing), visible fatigue, diaphoresis, and persistent hypoxemia indicates critical airway obstruction and impending respiratory failure. The appropriate next steps in the management bundle include escalating to continuous nebulized albuterol to provide sustained bronchodilation, and administering an intravenous smooth muscle relaxant such as magnesium sulfate. Magnesium sulfate acts by competing with calcium at the voltage-gated calcium channels of smooth muscle, leading to further bronchodilation. If these interventions fail, the patient may require non-invasive positive pressure ventilation (NIPPV) or intravenous terbutaline.

Step-by-Step Solution

1
Interpret the clinical presentation and physical exam findings.
The patient has a history of asthma and presents with fatigue, hypoxia, severe retractions, and a 'silent chest' (diminished air entry without wheezing) after failing initial bronchodilator and corticosteroid therapy.
These findings establish a diagnosis of severe status asthmaticus with critical airway obstruction and impending respiratory failure.
2
Determine the appropriate escalation in the management pathway.
Escalate to continuous short-acting beta-agonists and administer an intravenous adjunct therapy like magnesium sulfate.
Standard intermittent therapies have failed; aggressive bronchodilation with continuous albuterol and smooth muscle relaxation with magnesium are required while preparing for potential non-invasive or invasive ventilatory support.

Key Concept

Management of acute severe asthma exacerbation (status asthmaticus) refractory to initial emergency department therapies.
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Topics

Pediatric Respiratory Disorders

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