Pathophysiology, diagnosis and prognostic implications of endothelial dysfunction.
Endothelial dysfunction (ED) in the setting of cardiovascular risk factors such as hypercholesterolemia, hypertension, diabetes mellitus, chronic smoking as well as in patients with heart failure has been shown to be at least in part dependent on the production of reactive oxygen species (ROS) such as superoxide and the subsequent decrease in vascular bioavailability of nitric oxide (NO). Methods to quantify endothelial dysfunction include forearm plethysmography, flow-dependent dilation of the brachial artery, finger-pulse plethysmography, pulse curve analysis, and quantitative coronary angiography after intracoronary administration of the endothelium-dependent vasodilator acetylcholine. Superoxide sources include the NADPH oxidase, xanthine oxidase, and mitochondria. Superoxide produced by the NADPH oxidase may react with NO released by the endothelial nitric oxide synthase (eNOS) thereby generating peroxynitrite (ONOO-), leading to eNOS uncoupling and therefore eNOS-mediated superoxide production. The present review will discuss current concepts of how to assess endothelial function, prognostic implications of ED, mechanisms underlying ED with focus on oxidative stress and circulating biomarkers, which have been proposed to indicate endothelial dysfunction and/or damage, respectively.
Münzel
Thomas
T
II Clinic of Medicine, Cardiology, Angiology and Intensive Care, Johannes Gutenberg University Mainz, Mainz, Germany. tmuenzel@uni-mainz.de
Sinning
Christoph
C
Post
Felix
F
Warnholtz
Ascan
A
Schulz
Eberhard
E
D000818:Animals; D015415:Biomarkers; D002318:Cardiovascular Diseases / Q000503:physiopathology* / Q000517:prevention & control; D002986:Clinical Trials as Topic; D004730:Endothelium, Vascular / Q000503:physiopathology*; D006801:Humans; D018384:Oxidative Stress; D011322:Primary Prevention; D011379:Prognosis; D017382:Reactive Oxygen Species; D012307:Risk Factors
D015415:Biomarkers; D017382:Reactive Oxygen Species