We describe 3 patients with an initial diagnosis of myocardial infarct
ion, in whom a definitive diagnosis of myocarditis was subsequently es
tablished. All had precordial chest pain, electrocardiographic changes
, elevated cardiac enzyme levels and regional wall motion abnormalitie
s of the left ventricle compatible with myocardial infarction. During
follow-up, all symptoms subsided and electrocardiographic tracings nor
malized. Regional wall motion abnormalities disappeared in two and per
sisted in one patient. These findings show that myocarditis may mimic
myocardial infarction, and that the definitive diagnosis is generally
established retrospectively.