endothelial dysfunction
Pathological alteration in endothelial cell function resulting in impaired vasodilation and increased thrombotic risk.
Full Definition
Endothelial dysfunction represents a fundamental pathophysiological process characterized by impaired endothelial cell function, particularly reduced nitric oxide bioavailability and subsequent vasodilatory capacity. This condition involves multiple abnormalities including decreased endothelium-dependent vasodilation, increased oxidative stress, enhanced inflammatory responses, and prothrombotic surface expression. Endothelial dysfunction is recognized as an early marker of atherosclerosis and cardiovascular disease, often preceding structural arterial changes. Assessment methods include flow-mediated dilation testing, pharmacological vasodilation studies, and biomarker evaluation. The condition is associated with traditional cardiovascular risk factors and serves as both a therapeutic target and prognostic indicator.
Usage
Usage note: Distinguish from structural endothelial damage; represents functional rather than anatomical abnormality.
In Context
- "Flow-mediated dilation testing revealed significant endothelial dysfunction in the brachial artery." — Cardiovascular research study
- "The presence of endothelial dysfunction predicted future cardiovascular events in this patient cohort." — Prognostic assessment