hyperkinesis
Pronunciation: HY-per-ki-NEE-sis
Exaggerated myocardial contraction exceeding normal wall motion and thickening parameters.
Full Definition
Hyperkinesis refers to exaggerated myocardial contraction characterized by increased wall motion and systolic thickening beyond normal parameters. This compensatory mechanism often occurs in myocardial segments adjacent to areas of dysfunction (compensatory hyperkinesis) or in response to increased contractility from catecholamine stimulation. Hyperkinetic segments demonstrate vigorous inward motion during systole with marked wall thickening, often appearing as hyperdynamic contraction on echocardiography. While hyperkinesis may represent normal physiologic response to exercise or stress, it can also indicate compensatory mechanisms in the setting of regional dysfunction or early signs of catecholamine excess. Global hyperkinesis may suggest hyperdynamic circulation states.
Usage
Usage note: May be physiologic (compensatory) or pathologic; distinguish from tachycardia effects.
In Context
- "Compensatory hyperkinesis of the posterior wall was noted adjacent to the akinetic anterior segments." — Post-MI echocardiography report
- "Global hyperkinesis during stress testing may indicate hyperdynamic response rather than ischemia." — Stress test interpretation