Withdrawal of Digoxin from Patients with Chronic Heart Failure Treated with Angiotensin-Converting-Enzyme Inhibitors
Milton Packer, Mihai Gheorghiade, James B. Young, Peter J. Costantini, Kirkwood F. Adams, Robert J. Cody, L. Kent Smith, Lucy Van Voorhees, Lynn A. Gourley, M. King Jolly, for The RADIANCE Study
Background Although digoxin is effective in the treatment ofpatients with chronic heart failure who are receiving diureticagents, it is not clear whether the drug has a role when patientsare receiving angiotensin-converting-enzyme inhibitors, as isoften the case in current practice.
Methods We studied 178 patients with New York Heart Associationclass II or III heart failure and left ventricular ejectionfractions of 35 percent or less in normal sinus rhythm who wereclinically stable while receiving digoxin, diuretics, and anangiotensin-converting-enzyme inhibitor (captopril or enalapril).The patients were randomly assigned in a double-blind fashioneither to continue receiving digoxin (85 patients) or to beswitched to placebo (93 patients) for 12 weeks. Otherwise, theirmedical therapy for heart failure was not changed.
Results Worsening heart failure necessitating withdrawal fromthe study developed in 23 patients switched to placebo, butin only 4 patients who continued to receive digoxin (P<0.001).The relative risk of worsening heart failure in the placebogroup as compared with the digoxin group was 5.9 (95 percentconfidence interval, 2.1 to 17.2). All measures of functionalcapacity deteriorated in the patients receiving placebo as comparedwith those continuing to receive digoxin (P = 0.033 for maximalexercise tolerance, P = 0.01 for submaximal exercise endurance,and P = 0.019 for New York Heart Association class). In addition,the patients switched from digoxin to placebo had lower quality-of-lifescores (P = 0.04), decreased ejection fractions (P = 0.001),and increases in heart rate (P = 0.001) and body weight (P<0.001).
Conclusions These findings indicate that the withdrawal of digoxincarries considerable risks for patients with chronic heart failureand impaired systolic function who have remained clinicallystable while receiving digoxin and angiotensin-converting-enzymeinhibitors.
Source Information
From the Mount Sinai School of Medicine, New York (M.P.); Henry Ford Hospital, Detroit (M.G.); Baylor College of Medicine, Houston (J.B.Y.); the University of Medicine and Dentistry of New Jersey, Camden (P.J.C.); the University of North Carolina, Chapel Hill (K.F.A.); Ohio State University School of Medicine, Columbus (R.J.C.); the Arizona Heart Institute, Tucson (L.K.S.); the Washington Hospital Center, Washington, D.(L.V.V.); G.H. Besselaar Associates, Princeton, N.J. (L.A.G.); and Burroughs Wellcome Co., Research Triangle Park, N.(M.K.J.).
Address reprint requests to Dr. Packer at the Division of Circulatory Physiology and Center for Heart Failure Research, Columbia University, College of Physicians and Surgeons, 630 W. 168th St., New York, NY 10032.
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