skip to main content

Life-threatening asthma — RCPSC EM MCQ

Instant feedback + full explanation. One question, done properly.

HardRespiratory emergenciesLife-threatening asthmaRCPSC EM

CTAS 1. A 17-year-old with asthma is exhausted and speaking single words. RR is 34, SpO2 is 88% on oxygen, and chest auscultation is quiet. ABG shows pH 7.21, PaCO2 58 mmHg. Salbutamol has been started. What is the most likely diagnosis?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: ALife-threatening asthma exacerbation

Exhaustion, quiet chest, hypoxaemia, and hypercapnia in a known asthmatic indicate life-threatening asthma with impending respiratory failure.

Reference: Canadian Thoracic Society asthma guidance; CAEP acute asthma resources