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Lateral STEMI — RACP Adult Medicine MCQ

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ModerateCardiologyLateral STEMIRACP Adult Medicine

A 65-year-old man presents with acute chest pain and ST elevation in leads I and aVL with reciprocal changes in leads III and aVF. Which vessel is most likely occluded?

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Correct answer: B — Left circumflex artery

ST elevation in leads I and aVL with reciprocal inferior changes is characteristic of a lateral STEMI. The left circumflex artery supplies the lateral wall of the left ventricle and its occlusion produces this ECG pattern.

Reference: CSANZ – 2025 – ACS Guidelines