Cocaine-induced myocardial infarction in patients with normal coronary arteries.
OBJECTIVE
To review the reported cases of myocardial infarction temporally related to recreational and topical anesthetic use of cocaine, with special regard for underlying etiologic factors in patients subsequently found to have normal coronary arteries.


METHODS
Personal records of three cases and a comprehensive literature review using MEDLINE and supplemented by Index Medicus and the bibliographies of case reports.


RESULTS
A total of 114 cases of cocaine-induced myocardial infarction were identified. The coronary anatomy was defined by angiography or autopsy in 92 patients, 38% of whom had normal coronary arteries. In these 35 patients (average age, 32; range, 21 to 60 years), myocardial infarction typically involved the anterior left ventricular wall (77%). Moderate cigarette smoking with one or fewer associated coronary risk factors was prevalent (68%). Focal coronary vasospasm was shown convincingly in only two cases. Intracoronary thrombus was initially found on 9 of 11 angiograms (82%) done within 12 hours of the myocardial infarction. Experimental evidence suggests that cocaine has direct and indirect sympathomimetic effects on vascular smooth muscle, attenuates endothelium vasodilator capacity, exerts a potent depressant effect on cardiac myocytes, and promotes atherogenesis.


CONCLUSIONS
Cocaine-induced myocardial infarction in patients with normal coronary arteries probably involves adrenergically mediated increases in myocardial oxygen consumption, vasoconstriction of large epicardial arteries or small coronary resistance vessels, and coronary thrombosis. Accelerated atherosclerosis and impairment of endothelium vasodilator function may occur after chronic cocaine use.
Department of Medicine, University of Iowa Hospitals and Clinics, Iowa City 52242.
R L
RL
Minor
B D
BD
Scott
D D
DD
Brown
M D
MD
Winniford
D000328:Adult; D000772:Anesthesia, Local / Q000009:adverse effects; D003042:Cocaine / Q000009:adverse effects*; D017023:Coronary Angiography; D003327:Coronary Disease / Q000139:chemically induced; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000139:chemically induced* / Q000000981:diagnostic imaging; D010036:Otolaryngology
D003042:Cocaine