PMID: 2492768Feb 1, 1989Paper

Redistribution of coronary microvascular resistance produced by dipyridamole

The American Journal of Physiology
W M ChilianM L Marcus

Abstract

This study assessed the redistribution of coronary microvascular resistance during vasodilation produced by dipyridamole. Measurements of microvascular diameter and pressure in the beating left ventricle of anesthetized cats were accomplished by means of a computer-controlled system that enabled measurements in the beating heart. Resistances of coronary arteries, microvessels, and veins were calculated from the quotients of the pressure gradient across each vascular compartment and myocardial perfusion (radioactive microspheres). Administration of dipyridamole increased coronary blood flow from 1.80 +/- 0.09 to 6.42 +/- 0.31 ml.min-1. g-1 (P less than 0.05). During control conditions, 25 +/- 8% of total resistance occurred in coronary arteries (proximal to 170 microns), 68 +/- 8% of total resistance was in coronary microvessels (between arterioles less than 170 microns in diameter and venules less than 150 microns in diameter), and 7 +/- 7% of resistance resided in veins (distal to 150 microns). There was a significant redistribution (P less than 0.05) of resistance in all vessel classes after dipyridamole: coronary arteries constituted 42 +/- 6%, microvessels contained 27 +/- 5%, and veins had 31 +/- 8% of total coronary resis...Continue Reading

Citations

Mar 1, 1995·Basic Research in Cardiology·D V DeFily, W M Chilian
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