dyskinesis
Pronunciation: dis-kih-NEE-sis
Paradoxical outward movement of myocardial segments during systole, indicating severe wall motion abnormality.
Full Definition
Dyskinesis refers to abnormal myocardial wall motion characterized by paradoxical outward bulging during systolic contraction, when the segment should normally move inward. This represents the most severe form of wall motion abnormality and typically indicates transmural myocardial infarction with aneurysm formation or severe ischemia. Dyskinetic segments not only fail to contribute to cardiac output but actually impair overall ventricular function by expanding during systole. This finding is associated with poor prognosis and may require surgical intervention such as aneurysmectomy. Dyskinesis can be detected on echocardiography, cardiac MRI, or ventriculography and is often accompanied by thinning of the myocardial wall.
In Context
- "The apical segments showed dyskinesis with aneurysmal dilatation on the echocardiogram." — Echocardiogram report
- "Surgical repair was considered given the extensive dyskinesis and reduced ejection fraction." — Cardiothoracic surgery consultation