Published online before print June 6, 2005, doi: 10.1161/01.HYP.0000169972.96201.8e
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(Hypertension. 2005;46:124.)
© 2005 American Heart Association, Inc.
Original Articles |
Left Ventricular Hypertrophy Is More Prevalent in Blacks Than Whites in the General Population
The Dallas Heart Study
From the Heart Failure Research Unit (M.H.D., D.L.D.), Donald W. Reynolds Cardiovascular Clinical Research Center (M.H.D., D.L.D., R.G.V., R.M.P., C.K., F.K., D.W.), and Divisions of Cardiology (M.H.D., D.L.D., R.M.P., C.K., F.K., D.W.) and Hypertension (R.G.V.), Department of Internal Medicine University of Texas Southwestern Medical Center, Dallas; and the Department of Preventive Medicine and Epidemiology (R.S.C.), Loyola University, Maywood, Ill.
Reprint requests to Dr Mark Drazner, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390-9047. E-mail Mark.Drazner{at}utsouthwestern.edu
Although recent studies have suggested that blacks compared with whites have an increased prevalence of left ventricular hypertrophy, it remains uncertain whether this is true despite adjustment for body composition (fat mass and fat-free mass) and when assessed by cardiac MRI in the general population. The Dallas Heart Study is a population-based study of Dallas County in which 1335 black and 858 white participants 30 to 67 years of age underwent detailed assessment including dual-energy x-ray absorptiometry scan to measure body composition and cardiac MRI. Left ventricular hypertrophy, whether defined by indexation to body surface area (P<0.001), fat-free mass (P=0.002), or height2.7 (P<0.001) was 2- to 3-fold more common in black versus white women. Similar results were seen when comparing black and white men (P<0.001 when left ventricular hypertrophy was indexed to body surface area or height2.7 and P=0.05 when indexed to fat-free mass). Ethnic disparities in left ventricular mass persisted in multivariable models despite adjustment for fat mass, fat-free mass, systolic blood pressure, age, gender, and measures of socioeconomic status. We conclude that blacks compared with whites have increased left ventricular mass and a 2- to 3-fold higher prevalence of left ventricular hypertrophy in the general population, as assessed by cardiac MRI. The ethnic differences in left ventricular mass are independent of differences in body composition.
Key Words: hypertrophy • ethnic groups • epidemiology • obesity
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