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Endothelial function fluctuates with diurnal variation in the frequency of ischemic episodes in patients with variant angina.

Abstract：

OBJECTIVES:The aim of the present study was to investigate whether there is diurnal fluctuation in the endothelial function of patients with variant angina (VA). BACKGROUND:Coronary spasm is induced by acetylcholine and is promptly relieved by nitroglycerin. Thus, it is possible that endothelial dysfunction is involved in the pathogenesis of coronary spasm. Furthermore, the frequency of ischemic episodes is known to display diurnal variation. METHODS:Flow-mediated, endothelium-dependent vasodilation of the brachial arteries was measured in the early morning (6 AM), afternoon (2 PM) and evening (8 PM) in 20 patients with VA (mean age 54.5 years; 10 men and 10 women) and in 20 control subjects (mean age 54.2 years; 10 men and 10 women). All patients underwent 24-h ambulatory electrocardiographic monitoring during the study. RESULTS:Flow-mediated vasodilation in patients with VA was deteriorated by the early morning and improved by the afternoon (patients with VA at 8 PM vs. 6 AM vs. 2 PM: 7.8 +/- 2.1% (p < 0.01 vs. VA at 6 AM) vs. 5.4 +/- 2.3% vs. 8.8 +/- 1.9% (p < 0.01 vs. VA at 6 AM); control subjects: 9.5 +/- 2.8% vs. 9.0 +/- 2.2% vs. 9.9 +/- 1.9%, respectively). The frequency of spontaneous ischemic episodes was highest from midnight to morning and was lowest from morning to late afternoon (4 PM to midnight: 7 episodes; midnight to 8 AM: 25 episodes; 8 AM to 4 PM: 3 episodes). CONCLUSION:There is diurnal fluctuation in endothelial function, which is associated with variation in the frequency of ischemic episodes.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Kawano H,Motoyama T,Yasue H,Hirai N,Waly HM,Kugiyama K,Ogawa H

doi

10.1016/s0735-1097(02)01956-3

subject

Has Abstract

pub_date

2002-07-17 00:00:00

pages

266-70

issue

2

eissn

0735-1097

issn

1558-3597

pii

S0735109702019563

journal_volume

40

pub_type

杂志文章

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