Transient left posterior hemiblock during Prinzmetal's angina culminating in acute myocardial infarction

A 49-year-old man had transient left posterior hemiblock during Prinzmetal's angina with inferior ST-segment elevations; subsequently, left posterior hemiblock reappeared associated with acute inferior myocardial infarction. The electrocardiographic and electrophysiologic aspects of these findings are discussed.