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European Heart Journal 1997 18(6):949-953;
Copyright © 1997 by the European Society of Cardiology.
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© 1997 The European society of Cardiology

Intravascular ultrasonic evidence by constant cross-sectional area of atherosclerotic plaques during coronary vasomotion in humans

Y. Matsu-ura, Y. Kijima, K. Hashimura, Y. Kato, T. Ueda, T. Yasuda, I. Mori, S. Hoshida* and M. Hori*

Cardiovascular Division, Ishinkai Yao General Hospital Osaka, Japan
*First Department of Medicine, Osaka University School of Medicine Osaka, Japan

Received 17 December 1996; accepted 19 December 1996.

Correspondence: Yoshiyuki Kijima, MD, PhD, Cardiovascular Division, Ishinkai Yao General Hospital, 1-41 Numa Yao, Osaka 581, Japan

Abstract

AIMS: This study aims to visualize ultrasonically deformation of atherosclerotic plaques in human coronary arteries during vasoconstriction and vasodilatation.

METHODS AND RESULTS: Intravascular ultrasound detected occult atherosclerosis in angiographically normal coronary arteries of eight patients with chest pain at rest. During the acetylcholine provocative test, intravascular ultrasound monitored deformation of the atherosclerotic plaques. At the last step of the test, intracoronary injection of isosorbide dinitrate caused vasodilation. Under control, acetylcholine-treated, and isosorbide dinitrate-treated conditions, cross-sectional areas of sonolucent circle and vessel lumen were measured. Subtraction of the latter from the former gave the area of atherosclerotic plaque. In the process of vasoconstriction and vasodilation, the plaque area did not change significantly.

CONCLUSION: The cross-sectional area of the atherosclerotic plaque appeared to be constant during vasomotion of human coronary arteries.

Key Words: Intravascular ultrasound • atherosclerosis • vasospastic angina • geometric theory


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