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J Am Coll Cardiol, 2002; 39:408-412 © 2002 by the American College of Cardiology Foundation |
* Division of Cardiology, Department of Medicine, Harbor-UCLA Medical Center, Torrance, California, USA
Life Expectancy Project, San Francisco, California, USA
Bend Medical Clinic, Bend, Oregon, USA
Manuscript received May 10, 2001; revised manuscript received October 15, 2001, accepted November 1, 2001.
* Reprint requests and correspondence: Dr. Matthew Budoff, Division of Cardiology, Harbor-UCLA Research and Education Institute, 1124 West Carson Street, Bldg. RB-2, Torrance, California 90502-2064, USA.
mbudoff{at}rei.edu
OBJECTIVES: The study was done to evaluate whether ethnic differences exist in the prevalence of coronary artery calcification (CAC), and to determine whether differences in calcification correlate with the degree of coronary obstruction.
BACKGROUND: Electron beam tomography (EBT) can be used to quantitate the amount of CAC and assist in prognostication of future cardiac events. It is unclear whether ethnic differences in coronary mortality are related to differences in the prevalence of coronary obstruction and CAC.
METHODS: A total of 782 symptomatic subjects underwent both EBT and angiography. A 50% luminal narrowing defined an angiographic obstruction.
RESULTS: We observed substantial ethnic differences in prevalence of both CAC and angiographic stenosis. In whites (n = 453), prevalence of CAC (score >0) was 84%, and significant obstruction on angiogram was 71%. Compared with whites, blacks (n = 108) had a significantly lower prevalence of CAC (62%, p < 0.001) and angiographic disease (49%, p < 0.01). Hispanics (n = 177) also had a lower prevalence of CAC (71%, p < 0.001) and angiographic obstruction (58%, p < 0.01). Asians (n = 44) were not significantly different in regard to CAC (73%, p = 0.06) or angiographic stenosis (64%, p = 0.30). These ethnic differences remained after simultaneously controlling (by use of multiple logistic regression) for age, gender and cardiac risk factors.
CONCLUSIONS: As compared with whites, blacks and Hispanics had significantly lower prevalence of CAC and obstructive coronary disease. Ethnic differences in risk-factor profiles do not explain these differences. This study demonstrated that whites have a higher atherosclerotic burden than blacks and Hispanics, independent of risk-factor differences among symptomatic patients referred for angiography.
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