Duplex doppler and spectral flow analysis of racial differences in cerebrovascular atherosclerosis

Abstract

We compared carotid artery disease in 99 black and 106 white patients using duplex ultrasonography (B-mode imaging and Doppler spectral analysis). Blacks had significantly less stenosis of the extracranial internal carotid artery than whites. Among the risk factors investigated, hypertension alone, ischemic heart disease, diabetes mellitus, and smoking failed to explain the racial difference. Although carotid stenosis of ≥40% correlated significantly with age in both races (p =0.001 in whites and p=0.005 in blacks), blacks had significantly less carotid stenosis of any degree even when age was taken into account Multivariate analysis showed that race is a significant and independent risk factor for carotid stenosis (p<0.0001). Hypertension interacting with race was also significant Our results require verification in population-based studies. Carotid duplex ultrasonography offers a n on invasive method for carrying out such studies. © 1990 American Heart Association, Inc.