Background Black patients with heart failure have a poorer prognosisthan white patients, a difference that has not been adequatelyexplained. Whether racial differences in the response to drugtreatment contribute to differences in outcome is unclear. Toaddress this issue, we pooled and analyzed data from the Studiesof Left Ventricular Dysfunction (SOLVD) prevention and treatmenttrials, two large, randomized trials comparing enalapril withplacebo in patients with left ventricular dysfunction.
Methods We used a matched-cohort design in which up to fourwhite patients were matched with each black patient accordingto trial, treatment assignment, sex, left ventricular ejectionfraction, and age. A total of 1196 white patients (580 fromthe prevention trial and 616 from the treatment trial) werematched with 800 black patients (404 from the prevention trialand 396 from the treatment trial). The average duration of follow-upwas 35 months in the prevention trial and 33 months in the treatmenttrial.
Results The black patients and the matched white patients hadsimilar demographic and clinical characteristics, but the blackpatients had higher rates of death from any cause (12.2 vs.9.7 per 100 person-years) and of hospitalization for heart failure(13.2 vs. 7.7 per 100 person-years). Despite similar doses ofdrug in the two groups, enalapril therapy, as compared withplacebo, was associated with a 44 percent reduction (95 percentconfidence interval, 27 to 57 percent) in the risk of hospitalizationfor heart failure among the white patients (P<0.001) butwith no significant reduction among black patients (P=0.74).At one year, enalapril therapy was associated with significantreductions from base line in systolic blood pressure (by a mean[±SD] of 5.0±17.1 mm Hg) and diastolic blood pressure(3.6±10.6 mm Hg) among the white patients, but not amongthe black patients. No significant change in the risk of deathwas observed in association with enalapril therapy in eithergroup.
Conclusions Enalapril therapy is associated with a significantreduction in the risk of hospitalization for heart failure amongwhite patients with left ventricular dysfunction, but not amongsimilar black patients. This finding underscores the need foradditional research on the efficacy of therapies for heart failurein black patients.
Source Information
From the Cardiovascular Research Group, University of Calgary, Calgary, Alta., Canada (D.V.E.); the Cardiovascular Research Group, University of Texas Southwestern Medical School, Dallas (D.L.D.); the Clinical Trials Research Group, National Heart, Lung, and Blood Institute, Bethesda, Md. (D.V.E., D.L.D., M.J.D.); and the Cardiovascular Division, Department of Medicine, University of Minnesota Medical School, Minneapolis (J.N.C.).
Address reprint requests to Dr. Exner at the University of Calgary, 3330 Hospital Dr. NW, Rm. G208, Calgary, AB T2N 4N1, Canada, or at exner{at}ucalgary.ca.
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