hibernating myocardium
Chronically dysfunctional but viable myocardial tissue that can recover function following revascularization.
Full Definition
Hibernating myocardium refers to cardiac muscle tissue that has adapted to chronic ischemia by reducing its contractile function while maintaining cellular viability. This adaptive mechanism preserves myocyte survival in the setting of reduced coronary blood flow. The tissue appears hypokinetic or akinetic on imaging but retains metabolic activity and can recover normal function after restoration of adequate blood supply through revascularization procedures. Identification of hibernating myocardium is crucial for determining which patients will benefit from coronary intervention.
Usage
Usage note: Distinguish from stunned myocardium, which is acute and reversible without revascularization.
In Context
- "PET imaging revealed extensive hibernating myocardium in the anterior wall, supporting surgical revascularization." — Viability assessment report
- "The presence of hibernating myocardium was confirmed by low-dose dobutamine echocardiography showing contractile reserve." — Cardiac imaging interpretation