myocardial stunning
Temporary contractile dysfunction of viable myocardium following acute ischemia-reperfusion.
Full Definition
Myocardial stunning refers to the temporary depression of myocardial contractile function that persists after restoration of coronary blood flow following a period of acute ischemia. Unlike irreversible myocardial infarction, stunning affects viable tissue that gradually recovers function over days to weeks. This phenomenon commonly occurs after successful reperfusion therapy for acute coronary syndromes, during cardiac surgery, or following severe stress. The underlying mechanism involves calcium handling abnormalities and oxidative stress rather than irreversible cellular damage. Recognition of stunning is important for prognosis and avoiding unnecessary interventions.
Usage
Usage note: Distinguish from hibernating myocardium by specifying acute versus chronic ischemia context.
In Context
- "The wall motion abnormality likely represented myocardial stunning rather than completed infarction." — Post-PCI echocardiography report
- "Serial imaging confirmed recovery of function consistent with myocardial stunning phenomenon." — Cardiology follow-up note