stunning
Reversible myocardial dysfunction following ischemia-reperfusion, despite restored blood flow.
Full Definition
Myocardial stunning is a clinical syndrome characterized by prolonged but reversible mechanical dysfunction of viable myocardium following an ischemic episode, despite restoration of normal coronary flow. The phenomenon occurs due to transient metabolic and contractile impairment caused by ischemia-reperfusion injury, with recovery of function occurring over hours to weeks. Stunning is distinguished from hibernating myocardium by the presence of normal or near-normal perfusion at rest. Common causes include percutaneous coronary intervention, cardiac surgery, stress testing, or spontaneous coronary spasm. Recognition is important to avoid unnecessary interventions in viable myocardium.
Usage
Usage note: Often qualified as 'myocardial stunning' in formal reports; distinct from hibernation.
In Context
- "Post-procedural echocardiography showed myocardial stunning in the RCA territory following PCI." — Post-intervention report
- "The patient's wall motion abnormalities likely represent stunning rather than infarction given the preserved perfusion." — Clinical interpretation