Acute pericarditis	Acute myocardial infarction	Early repolarization
ST-segment elevation in many leads, with no ST-segment depression Upward concave ST-segment elevation No T-wave inversion in leads with ST-segment elevation PR-segment depression Q waves during evolution	ST-segment elevation in anatomically contiguous leads, with possible reciprocal ST-segment depression Upward convex ST-segment elevation T-wave inversion in leads with ST-segment elevation as myocardial infarction evolves No PR-segment depression May have Q waves during evolution	ST-segment elevation in middle and left precordial leads, but may be widespread Upward convex ST-segment elevation May have T-wave inversion in leads with ST-segment elevation No PR-segment depression No Q waves