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(Circulation. 2002;106:184.)
© 2002 American Heart Association, Inc.

Clinical Investigation and Reports

Predisposition to Atherosclerosis by Infections

Role of Endothelial Dysfunction

Abhiram Prasad, MD, MRCP; Jianhui Zhu, MD, PhD; Julian P.J. Halcox, MB, MRCP; Myron A. Waclawiw, PhD; Stephen E. Epstein, MD; Arshed A. Quyyumi, MD, FRCP

From the Cardiology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md, and National Heart, Lung, and Blood Institute, Cardiovascular Research Institute, Medstar Research Institute (J.Z., S.E.E.), Washington Hospital Center, Washington, DC.

Correspondence to Arshed A. Quyyumi, MD, Professor of Medicine (Cardiology), Emory University Hospital, Suite F606, 1364 Clifton Road NE, Atlanta, GA 30322.

Background— Several microorganisms have been implicated in the pathogenesis of atherosclerosis. We hypothesized that infections may predispose to atherosclerosis by inflicting endothelial injury.

Methods and Results— Of 375 patients undergoing coronary angiography, 218 had assessment of endothelial function using intracoronary acetylcholine (ACH) and of endothelium-independent function with sodium nitroprusside and adenosine. Immunoglobulin-G antibody titers to cytomegalovirus, Chlamydia pneumoniae, Helicobacter pylori, hepatitis A virus, and herpes simplex virus-1 were measured. Pathogen burden was defined as the number of positive antibodies. Although positive serology to individual pathogens tended to be associated with increased incidence of coronary arteriosclerosis (CAD), the pathogen burden correlated with the presence of CAD, even after adjustment for risk factors (OR 1.3; 95% CI, 1.05 to 1.6, P=0.018). Moreover, the severity of CAD was independently associated with the pathogen burden (P=0.001). Pathogen burden was an independent predictor of endothelial dysfunction, determined as the percent change in coronary vascular resistance in response to ACH (P=0.009) but not the responses to sodium nitroprusside or adenosine. Pathogen burden was also an independent determinant of endothelial function in the subgroup with angiographically normal coronary arteries.

Conclusions— The immunoglobulin-G antibody response to multiple pathogens (pathogen burden) is an independent risk factor for endothelial dysfunction and the presence and severity of CAD. Endothelial dysfunction provides the crucial link by which pathogens may contribute to atherogenesis.

Key Words: atherosclerosis • infection • viruses • endothelium • coronary disease

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