(Circulation. 1999;100:1502-1508.)
© 1999 American Heart Association, Inc.
Clinical Investigation and Reports |
A Positive Family History of Premature Coronary Artery Disease Is Associated With Impaired Endothelium-Dependent Coronary Blood Flow Regulation
From the Department of Internal Medicine IV, Division of Cardiology, and Department of Internal Medicine I (I.S.), Division of Angiology, J.W. Goethe University, Frankfurt, Germany.
Correspondence to Volker Schächinger, MD, Department of Internal Medicine IV, Division of Cardiology, J.W. Goethe University, Theodor-Stern-Kai 7, D-60590 Frankfurt, FRG. E-mail schaechinger{at}em.uni-frankfurt.de
Background—The aim of the study was to determine whether a positive family history of coronary artery disease is related to impaired coronary blood flow regulation.
Methods and Results—In 150 patients with angiographically normal or minimally diseased coronary vessels, risk factors for coronary artery disease, the extent of atherosclerosis and endothelium-dependent vasomotor responses to acetylcholine, and endothelium-independent blood flow regulation by papaverine or adenosine were assessed. Coronary blood flow responses to acetylcholine were reduced in a dose-dependent manner in patients with a positive family history (P=0.030). By multivariate analysis, hypercholesterolemia (P=0.001), age (P=0.002), and a positive family history (P=0.008) remained predictors of coronary blood flow increase to acetylcholine. The extent of atherosclerotic coronary artery disease was, by multivariate analysis, an additional independent predictor of acetylcholine-induced blood flow (P=0.014), but also of endothelium-independent blood flow regulation (P=0.001). A positive family history had additive effects in addition to the other risk factors, such as hypercholesterolemia or increased age. Angiotensin-converting-enzyme genotype polymorphism had no influence either on endothelium-dependent or endothelium-independent coronary blood flow responses. However, in a subset of 28 patients, homocysteine (which is, in part, genetically determined) was inversely related to maximal acetylcholine-induced blood flow regulation (r=-0.47, P=0.012).
Conclusions—The results of this study demonstrate, for the first time, that a positive family history of coronary artery disease is an important predictor of impaired endothelium-dependent coronary blood flow regulation in humans. The influence of a positive family history is independent of other well known risk factors but instead aggravates endothelial vasodilator dysfunction associated with hypercholesterolemia and increased age, suggesting important interacting effects between genetic and environmental risk factors.
Key Words: coronary disease • endothelium • circulation • acetylcholine • blood flow
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