A

Prinzmetal’s angina most frequently involves spasm of the right coronary artery, producing transient inferior-lead ST-segment elevation that mimics an inferior myocardial infarction, whereas spasm is usually at (not distal to) an atherosclerotic lesion and the ECG shows reversible ST changes rather than persistent Q-waves [Haywood, 1976, PMID 811819; Amiel, 1977, PMID 404423; MacAlpin, 1980, PMID 6770668; Weiner, 1978, PMID 679740].