(Circulation. 2001;104:2638.)
© 2001 American Heart Association, Inc.
Editorials |
Oxidant Stress as a Marker for Cardiovascular Events
Ox Marks the Spot
From the Department of Medicine, Emory University School of Medicine, and the Atlanta Veterans Administration Hospital, Atlanta, Ga.
Correspondence to David G. Harrison, MD, Division of Cardiology, Emory University School of Medicine, 1639 Pierce Dr, 319 WMB, Atlanta, GA 30322. E-mail dharr02@emory.edu
Key Words: Editorials • endothelium • oxidant stress • coronary disease • nitric oxide
During the past decade, numerous experimental and clinical studies have demonstrated that many common conditions predisposing to atherosclerosis, such as hypercholesterolemia, hypertension, diabetes, and smoking, are associated with a reduced vascular availability of nitric oxide (NO
). Nitric oxide not only produces vasodilation but also has potent antiatherogenic properties. These properties include inhibition of platelet aggregation, prevention of smooth muscle cell proliferation, reduction of lipid peroxidation, and inhibition of adhesion molecule expression. Thus, the loss of NO observed in these various conditions not only alters vascular tone but also may explain in part why these conditions are risk factors for atherosclerosis.
See p 2673
Given this apparent link between loss of nitric oxide and atherosclerosis, several groups have been interested in the concept that endothelium-dependent vasodilation, a surrogate for NO bioavailability, may predict cardiovascular events. Indeed, Suwaidi et al1 followed 157 patients with mildly diseased coronary arteries for an average of 28 months and observed cardiac events only in the patients with the lowest tertile of coronary vasodilation to acetylcholine. Similarly, in a study of 147 patients, Schächinger et al2 used 3 different stimuli for endothelial release of NO: acetylcholine, cold pressor testing, and increased blood flow. The authors showed that responses to each of these stimuli were independent predictors of cardiovascular events during a follow-up period of 
8 years. Perticone et al3 also demonstrated that endothelial dysfunction in the forearm circulation predicts cardiovascular events in hypertensive subjects.
There have been several explanations for why the various risk factors impair
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