endothelial dysfunction
Impaired function of the inner blood vessel lining, characterized by reduced nitric oxide availability and altered vascular reactivity.
Full Definition
Endothelial dysfunction represents an early pathological change in vascular disease where the endothelium loses its normal regulatory functions including vasodilation, anticoagulation, and anti-inflammatory properties. This condition is characterized by reduced nitric oxide bioavailability, increased oxidative stress, and enhanced inflammatory responses. It precedes structural vascular changes and is considered an early marker of atherosclerosis. Assessment methods include flow-mediated dilation testing and endothelial-dependent vasoreactivity studies.
Usage
Usage note: Often considered the earliest detectable stage of vascular disease.
In Context
- "Flow-mediated dilation testing revealed significant endothelial dysfunction in this diabetic patient." — Research study report
- "Endothelial dysfunction precedes the development of structural atherosclerotic changes." — Educational material