myocardial hibernation
A protective state of chronically reduced myocardial function in response to persistent hypoperfusion, potentially reversible with revascularization.
Full Definition
Myocardial hibernation represents an adaptive response to chronic coronary hypoperfusion where viable myocardium downregulates its contractile function to match reduced oxygen supply. Unlike myocardial stunning, hibernating myocardium maintains cellular viability but operates at a reduced functional level to prevent irreversible injury. This condition is most commonly seen in patients with severe coronary artery disease and can be detected through stress testing, metabolic imaging, or dobutamine echocardiography. During cardiac anesthesia for revascularization procedures, hibernating myocardium may show delayed recovery of function, and anesthetic management must account for potentially impaired contractile reserve until perfusion is restored.
Usage
Usage note: Distinguish from stunning (acute vs. chronic); emphasize reversibility with revascularization.
In Context
- "Preoperative viability studies confirmed myocardial hibernation in the anterior wall territory." — Cardiac catheterization report
- "The patient's hibernating myocardium showed gradual improvement in function following successful revascularization." — Postoperative follow-up