ECG finding	Acute pericarditis	Myocardial infarction	Early repolarization
ST-segment shape	Concave upward	Convex upward	Concave upward
Q waves	Absent	Present	Absent
Reciprocal ST-segment changes	Absent	Present	Absent
Location of ST-segment elevation	Limb and precordial leads	Area of involved artery	Precordial leads
ST/T ratio in lead V6*	>0.25	N/A	<0.25
Loss of R-wave voltage	Absent	Present	Absent
PR-segment depression	Present	Absent	Absent