endothelial dysfunction
Pronunciation: en-doh-THEE-lee-al
Impaired function of the blood vessel lining that represents an early stage of atherosclerosis, characterized by reduced nitric oxide availability and increased vascular inflammation.
Full Definition
Endothelial dysfunction refers to the impaired ability of the endothelium (the inner lining of blood vessels) to regulate vascular tone, inflammation, and thrombosis. This condition is characterized by reduced nitric oxide bioavailability, increased oxidative stress, enhanced inflammatory responses, and altered vascular permeability. Endothelial dysfunction is considered one of the earliest manifestations of atherosclerosis and can be detected before structural changes in the vessel wall become apparent. Risk factors include diabetes, hypertension, smoking, dyslipidemia, and sedentary lifestyle. Assessment methods include flow-mediated dilation, endothelial-dependent vasodilation testing, and biomarkers. Therapeutic interventions that improve endothelial function include statins, ACE inhibitors, exercise, and dietary modifications.
Usage
Usage note: Hyphenate when used as a compound modifier (e.g., 'endothelial-dependent vasodilation'); maintain consistent terminology throughout documents.
In Context
- "Flow-mediated dilation testing revealed significant endothelial dysfunction despite normal coronary angiography." — cardiac catheterization report
- "Statin therapy improves endothelial dysfunction through both lipid-dependent and independent mechanisms." — clinical pharmacology review