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To determine the importance of usual risk factors of coronary artery disease (CAD) in patients with coronary artery spasm, 40 patients with vasospastic angina (VA), normal or nearly normal coronary arteries and without previous myocardial infarction were compared with 2 control groups of 40 patients each, matched for age and sex: 1 group with CAD and 1 without heart disease. Ninety percent of patients with VA were cigarette smokers and 70% were heavy smokers (more than 20 cigarettes daily), compared with 53% and 33% in patients with CAD (p less than 0.001) and 30% and 15% in those without heart disease (p less than 0.001). Except for cigarette smoking, the risk factor profile of patients with VA appeared more like the profile of patients without heart disease than that of patients with CAD. The results suggest that cigarette smoking may play a role in CAD independent of atherosclerosis and possibly favoring coronary artery spasm.
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