Racial Differences in the Outcome of Left Ventricular Dysfunction
Daniel L. Dries, M.D., M.P.H., Derek V. Exner, M.D., Bernard J. Gersh, M.B., Ch.B., D.Phil., Howard A. Cooper, M.D., Peter E. Carson, M.D., and Michael J. Domanski, M.D.
Background Population-based studies have found that black patientswith congestive heart failure have a higher mortality rate thanwhite patients with the same condition. This finding has beenattributed to differences in the severity, causes, and managementof heart failure, the prevalence of coexisting conditions, andsocioeconomic factors. Although these factors probably accountfor some of the higher mortality due to congestive heart failureamong blacks, we hypothesized that racial differences in thenatural history of left ventricular dysfunction might also havea role.
Methods Using data from the Studies of Left Ventricular Dysfunction(SOLVD) prevention and treatment trials, in which all patientsreceived standardized therapy and follow-up, we conducted aretrospective analysis of the outcomes of asymptomatic and symptomaticleft ventricular systolic dysfunction among black and whiteparticipants. The mean (±SD) follow-up was 34.2±14.0months in the prevention trial and 32.3±14.8 months inthe treatment trial among the black and white participants.
Results The overall mortality rates in the prevention trialwere 8.1 per 100 person-years for blacks and 5.1 per 100 personyears for whites. In the treatment trial, the rates were 16.7per 100 person-years and 13.4 per 100 person-years, respectively.After adjustment for age, coexisting conditions, severity andcauses of heart failure, and use of medications, blacks hada higher risk of death from all causes in both the SOLVD preventiontrial (relative risk, 1.36; 95 percent confidence interval,1.06 to 1.74; P=0.02) and the treatment trial (relative risk,1.25; 95 percent confidence interval, 1.04 to 1.50; P=0.02).In both trials blacks were also at higher risk for death dueto pump failure and for the combined end point of death fromany cause or hospitalization for heart failure, our two predefinedindicators of the progression of left ventricular systolic dysfunction.
Conclusions Blacks with mild-to-moderate left ventricular systolicdysfunction appear to be at higher risk for progression of heartfailure and death from any cause than similarly treated whites.These results suggest that there may be racial differences inthe outcome of asymptomatic and symptomatic left ventricularsystolic dysfunction.
Source Information
From the Clinical Trials Scientific Research Group, Division of Epidemiology and Clinical Application, National Heart, Lung, and Blood Institute, Bethesda, Md. (D.L.D., D.V.E., H.A.C., M.J.D.); the Division of Cardiology, Georgetown University Hospital, Washington, D.C. (B.J.G.); and the Department of Veterans Affairs, Washington, D.C. (P.E.C.).
Address reprint requests to Dr. Dries at Clinical Trials Scientific Research Group, NHLBI, 2 Rockledge Ctr., 6701 Rockledge Dr., Rm. 8149, Bethesda, MD 20892-7936, or at ddries{at}aol.com.
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