Diabetes, Vol 42, Issue 7 1017-1025, Copyright © 1993 by American Diabetes Association

ARTICLES

Impairment of coronary vascular reserve and ACh-induced coronary vasodilation in diabetic patients with angiographically normal coronary arteries and normal left ventricular systolic function

A Nitenberg, P Valensi, R Sachs, M Dali, E Aptecar and JR Attali
Department of Cardiac Investigation, CHU Xavier-Bichat, Paris, France.

Evidence is increasing for small-vessel disease and disturbance of endothelium-dependent vasodilation in diabetic patients. The aim of this study was to compare coronary circulation in 11 diabetic patients (6 type I and 5 type II) and 7 control subjects. All patients had normal left ventricular systolic function and angiographically normal coronary arteries. To evaluate the maximal area of coronary microcirculation, coronary vascular reserve was determined by intracoronary Doppler and a maximally vasodilating dose of intracoronary papaverine (peak-to-resting coronary flow velocity ratio). To assess coronary endothelial function responses to stepwise intracoronary infusion of acetylcholine (10(-8) to 10(-5) M coronary estimated concentrations) were analyzed on four different segments in each patient by quantitative angiography. Peak-to-resting coronary flow velocity ratio was lower in diabetic patients than in control subjects (3.9 +/- 0.9 and 5.0 +/- 0.7, respectively, P < 0.02). Acetylcholine did not produce any diameter change at 10(-8) and 10(-7) M, but a progressive diameter reduction was observed at 10(-6) and 10(-5) M (-8.0 +/- 15.2%, P < 0.02 and -24.0 +/- 13.6%, P < 0.001, respectively). In control subjects, a progressive diameter dilation was produced from 10(-8) to 10(-6) M acetylcholine (5.1 +/- 3.4, 12.1 +/- 7.0, and 16.4 +/- 7.3%, respectively, all P < 0.001), and a moderate reduction was observed at 10(-5) M (-4.9 +/- 7.5%, P < 0.02). In the two groups, all segments dilated similarly after intracoronary isosorbide dinitrate.(ABSTRACT TRUNCATED AT 250 WORDS)
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