Myocardial stunning is a mechanical dysfunction that persists after re
perfusion of previously ischemic tissue in the absence of irreversible
damage including myocardial necrosis. Myocardial stunning is an unfav
orable phenomenon that is manifest during reperfusion and is caused mo
stly by events associated with reperfusion. This dysfunction and the a
ccompanying contractile abnormalities delay the benefits of reperfusio
n therapy.