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Chest, Vol 94, 290-295, Copyright © 1988 by American College of Chest Physicians

ARTICLES

The effect of cigarette smoking on the pattern of coronary atherosclerosis. A case-control study

R Vander Zwaag, GF Lemp, JP Hughes, KB Ramanathan, JM Sullivan, EC Schick and DM Mirvis
Department of Health Services Research, Baptist Memorial Hospital, Memphis.

Cigarette smoking is a risk factor for development of coronary atherosclerosis. We examined the relationship between smoking and the anatomic location of coronary artery stenosis in 8,705 patients undergoing cardiac catheterization for suspected coronary artery disease (CAD). The smoking history of patients with CAD (greater than or equal to 70 percent stenosis) was compared with that of control subjects (0 percent stenosis) for each of nine anatomic locations (proximal, middle, and distal segments of right [RCA], anterior descending [LAD], and circumflex arteries [LCX]), using a case-control method. The odds ratio (OR) estimate of relative risk of CAD for smokers relative to nonsmokers was 2.8, with a 95 percent confidence interval (CI) of 2.5 to 3.1. Relative risk was greater for RCA stenosis (OR = 5.8; CI = 4.6-7.2) than for LCX (OR = 3.5; CI = 2.7-4.5) or LAD (OR = 2.1; CI = 1.8-2.4) lesions when comparing smokers with nonsmokers. After control for age, gender, history of diabetes mellitus, and serum cholesterol level, the adjusted relative risk for an RCA lesion (Mantel-Haenszel odds ratio [MOR] = 4.9) was significantly elevated (p less than 0.05) compared with the LAD (MOR = 1.9) but not with the LCX (MOR = 3.1). The relative risks of CAD were the same (p greater than 0.05) for the proximal, middle, and distal coronary segments. Thus, smoking increased the risk of all coronary lesions but did so more for the RCA than for other vessels, suggesting a spatial pattern to the increased risk produced by smoking.


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