Coronary vasomotor effects of serotonin in patients with angina. Relation to coronary stenosis morphology.

Abstract:

BACKGROUND:Previous experimental studies have shown that the effect of serotonin on a coronary stenosis depends on whether that stenosis is compliant or fixed. However, the relation between coronary stenosis morphology and the response to serotonin in patients with angina is not known. METHODS AND RESULTS:Using computerized quantitative coronary angiography, we studied the effects of intracoronary infusion of serotonin on 38 coronary stenoses of different morphologies (concentric, eccentric, complicated) in 11 patients with stable angina and 4 with variant angina. In response to the maximum infused concentration of serotonin, 100% of complicated stenoses and 50% of concentric stenoses constricted by > or = 20% (P < .05). The magnitude of constriction was greater at eccentric stenoses (32.08 +/- 4.1%) than concentric stenoses (15.68 +/- 2.8%, P < .05) and greater in complicated stenoses (57.69 +/- 7.6%, P < .05) than eccentric stenoses. At complicated stenoses, the constriction was greater (0.85 +/- 0.16 mm, P < .05) than at the adjacent reference segments (0.42 +/- 0.12 mm). It was similar to the reference segment for both concentric and eccentric stenoses. The constriction at the stenosis was greater for irregular (complicated) lesions than for smooth (concentric and eccentric) lesions in both patients with stable (51.8 +/- 7.3% versus 22.5 +/- 4.1%, P < .001) and those with variant (77 +/- 17% versus 28.2 +/- 8.1%, P < .05) angina. There was a weak correlation (r = .39) of magnitude of constriction with stenosis length but not with baseline stenosis severity (minimum diameter). CONCLUSIONS:In these patients, the magnitude of the vasoconstrictor response to serotonin at the site of an atheromatous coronary plaque depends on the morphological characteristics of the plaque and is more closely related to irregular contour than stenosis severity or length. This relation suggests that variations in receptor type or density or in the smooth muscle cell response to stimulation may determine the response to locally released serotonin in patients with coronary disease.

journal_name

Circulation

journal_title

Circulation

authors

Tousoulis D,Davies G,McFadden E,Clarke J,Kaski JC,Maseri A

doi

10.1161/01.cir.88.4.1518

subject

Has Abstract

pub_date

1993-10-01 00:00:00

pages

1518-26

issue

4 Pt 1

eissn

0009-7322

issn

1524-4539

journal_volume

88

pub_type

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