myocardial stunning
Temporary myocardial dysfunction that persists after restoration of coronary blood flow following ischemia.
Full Definition
Myocardial stunning is a reversible form of myocardial dysfunction that occurs when viable myocardium exhibits prolonged contractile dysfunction despite restoration of normal coronary blood flow and absence of irreversible tissue damage. This phenomenon is commonly observed in cardiac surgery patients following cardiopulmonary bypass and cardioplegic arrest, where the myocardium may take hours to days to recover normal contractile function. Stunning is distinguished from hibernating myocardium (chronic adaptive response to reduced flow) and myocardial infarction (irreversible damage). Understanding stunning is important for postoperative management and predicting recovery of cardiac function.
Usage
Usage note: Distinguish from hibernating myocardium and myocardial infarction. Emphasize reversible nature.
In Context
- "The patient experienced myocardial stunning postoperatively, requiring inotropic support for 48 hours." — ICU progress note
- "Myocardial stunning should be differentiated from irreversible ischemic damage when assessing post-bypass function." — Educational material