skip to main content

Oxygen use in STEMI — DipIMC MCQ

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

ModeratePre-hospital PharmacologyOxygen use in STEMIDipIMC

A 60-year-old with chest pain has oxygen saturations of 98% on air, normal work of breathing and an ECG showing STEMI. A responder reaches for a non-rebreather mask. What is the most appropriate immediate action?

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

Reveal the answer and explanation

Correct answer: C — Do not give routine oxygen; monitor and give oxygen if hypoxaemia develops

Oxygen is indicated for hypoxaemia or respiratory distress, not routinely for normoxic STEMI. Aspirin and reperfusion pathway activation remain important. Oxygen should be treated as a titrated drug rather than a harmless default. The pearl is that normal saturations allow focus on antiplatelet therapy, analgesia and destination.

Reference: JRCALC Guidelines 2025; NICE Acute Coronary Syndromes NG185