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• W1844765511 abstract "Cocaine abuse has been associated with pathologic cardiovascular events including acute myocardial infarction (AMI) and sudden death. Although coronary vasospasm has been proposed as a possible mechanism, the ability of cocaine to induce coronary spasm has not been conclusively demonstrated. In these studies, isolated rat hearts were perfused with cocaine (100 micrograms to 500 micrograms/ml) for 1 minute, perfusion-fixed with glutaraldehyde, and histologically assessed for evidence of coronary spasm through light and electron microscopy. Light micrographs revealed that cocaine induced spasm in coronary arterioles up to 65 microns in diameter, whereas larger caliber vessels did not constrict. Ultrastructurally, vacuolation was observed in the endothelial and smooth muscle cells of constricted arterioles. Endothelial integrity was maintained and interendothelial junctions remained intact. Morphologic evidence of constriction was supported by data obtained from Langendorff-heart preparations in which cocaine reduced myocardial flow rate under constant pressure conditions and increased aortic perfusion pressure under constant flow conditions. Spasm induced by cocaine was prevented by the calcium entry blocker nitrendipine, but not by phentolamine, an alpha-adrenergic antagonist. The finding of small vessel spasm in this study may explain the significant number of clinical cases of cocaine-associated AMI in which the main coronary arteries appear angiographically normal." @default.
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• W1844765511 date "1989-07-01" @default.
• W1844765511 modified "2023-09-27" @default.
• W1844765511 title "Cocaine-induced small vessel spasm in isolated rat hearts." @default.
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• W1844765511 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1880230" @default.
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