A 10-year-old asthmatic presents with severe exacerbation: speaks in phrases only, HR 130/min, RR 34/min, SpO2 91%, marked accessory muscle use, and silent chest on auscultation. Despite 3 doses of nebulized salbutamol and ipratropium, systemic corticosteroids, and IV magnesium sulfate, he is deteriorating. Which is the MOST appropriate next step?
- A IV aminophylline infusion
- B Immediate intubation with ketamine-facilitated RSI ✓
- C Nebulized heliox (helium-oxygen mixture)
- D Subcutaneous epinephrine 0.01 mg/kg
Explanation
A silent chest in a severe asthmatic indicates impending respiratory failure (air movement so limited that no wheeze is generated). Failure to respond to maximal medical therapy (bronchodilators, systemic steroids, IV magnesium) mandates immediate intubation. Ketamine is the preferred induction agent for RSI in asthma due to its bronchodilatory properties (stimulates catecholamine release, causing bronchial smooth muscle relaxation). IV aminophylline has a narrow therapeutic index with significant adverse effects and limited additional benefit after maxnesium. Heliox and subcutaneous epinephrine are options for near-fatal asthma but do not take priority over securing the airway in a deteriorating patient.
Reference: Ghai Essential Pediatrics, 10th ed.
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Written and medically reviewed by the StethoPrep medical team.