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Titolo:
VITAMIN-C ATTENUATES ABNORMAL VASOMOTOR REACTIVITY IN SPASM CORONARY-ARTERIES IN PATIENTS WITH CORONARY SPASTIC ANGINA
Autore:
KUGIYAMA K; MOTOYAMA T; HIRASHIMA O; OHGUSHI M; SOEJIMA H; MISUMI K; KAWANO H; MIYAO Y; YOSHIMURA M; OGAWA H; MATSUMURA T; SUGIYAMA S; YASUE H;
Indirizzi:
KUMAMOTO UNIV,SCH MED,DIV CARDIOL,HONJO 1-1-1 KUMAMOTO 8608556 JAPAN
Titolo Testata:
Journal of the American College of Cardiology
fascicolo: 1, volume: 32, anno: 1998,
pagine: 103 - 109
SICI:
0735-1097(1998)32:1<103:VAAVRI>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITRIC-OXIDE ACTIVITY; VARIANT ANGINA; ENDOTHELIAL DYSFUNCTION; CIGARETTE-SMOKING; SUPEROXIDE ANION; RELAXING FACTOR; ACETYLCHOLINE; RISK; HYPERCHOLESTEROLEMIA; ANTIOXIDANT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
K. Kugiyama et al., "VITAMIN-C ATTENUATES ABNORMAL VASOMOTOR REACTIVITY IN SPASM CORONARY-ARTERIES IN PATIENTS WITH CORONARY SPASTIC ANGINA", Journal of the American College of Cardiology, 32(1), 1998, pp. 103-109

Abstract

Objectives. This study sought to examine effect of vitamin C, an antioxidant, on the abnormal vasomotor reactivity in spasm coronary arteries. Background. Oxygen free radicals generated in the arterial walls have been shown to cause endothelial vasomotor dysfunction. Methods. Responses of the epicardial arterial diameters of the left coronary arteries to the intracoronary infusion of acetylcholine (ACh) (10 and 50 mu g/min) were measured by quantitative coronary angiography before andduring combined intracoronary infusion of vitamin C (10 mg/min) or saline as a placebo in 32 patients with coronary spastic angina and in 34 control subjects. Results. Vitamin C infusion suppressed the constrictor response of the epicardial diameter to ACh in spasm coronary arteries but had no significant effect in the control coronary arteries (percent change in distal diameter in response to 10 mu g/min of ACh [constriction (-), dilation (+), mean a SEM] before vitamin C: -8.2 +/- 2.9% in spasm arteries, +8.4 +/- 2.9% in control arteries; during vitamin C: +0.2 +/- 3.8% in spasm arteries, +7.2 +/- 1.3%* in control arteries [p < 0.01 vs. spasm arteries before vitamin C]). The coronary sinus-arterial difference in plasma thiobarbituric acid reactive substances during ACh infusion, an indicator of lipid peroxidation in coronary circulation, was higher in patients with coronary spastic angina than in control subjects (p < 0.01) but was suppressed in patients with coronary spastic angina to comparable levels in control subjects by combined infusion of vitamin C. Saline infusion had no effect. Conclusions. The results indicate that vitamin C attenuates vasomotor dysfunction in epicardial coronary arteries in patients with coronary spastic angina. Oxygen free radicals may at least in part play a role in the abnormal coronary vasomotor reactivity in response to ACh in spasm coronary arteries. (C) 1998 by the American College of Cardiology.

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Documento generato il 30/11/20 alle ore 06:44:07