hibernating myocardium
Chronically ischemic but viable cardiac muscle that exhibits reduced contractility but retains potential for recovery with revascularization.
Full Definition
Hibernating myocardium represents a state of chronic myocardial dysfunction resulting from prolonged but reversible ischemia. The affected cardiac tissue maintains cellular viability and metabolic function at a reduced level, with contractile function proportionally decreased to match the limited oxygen supply. This adaptive mechanism protects the myocardium from irreversible damage, and function can be restored through successful revascularization procedures such as coronary artery bypass grafting or percutaneous coronary intervention.
Usage
Usage note: Distinguish from 'stunning' which is acute and temporary, whereas hibernation is chronic and adaptive.
In Context
- "Viability testing revealed hibernating myocardium in the inferior wall, suggesting potential benefit from revascularization." — Cardiology consultation note
- "The patient's hibernating myocardium showed improved contractility six months post-CABG." — Follow-up echocardiogram report