Cardiac-Resynchronization Therapy with or without an Implantable Defibrillator in Advanced Chronic Heart Failure
Michael R. Bristow, M.D., Leslie A. Saxon, M.D., John Boehmer, M.D., Steven Krueger, M.D., David A. Kass, M.D., Teresa De Marco, M.D., Peter Carson, M.D., Lorenzo DiCarlo, M.D., David DeMets, Ph.D., Bill G. White, Ph.D., Dale W. DeVries, B.A., Arthur M. Feldman, M.D., Ph.D., for the Comparison of Medical Therapy, Pacing, and Defibrillation in Heart Failure (COMPANION) Investigators
Background We tested the hypothesis that prophylactic cardiac-resynchronizationtherapy in the form of biventricular stimulation with a pacemakerwith or without a defibrillator would reduce the risk of deathand hospitalization among patients with advanced chronic heartfailure and intraventricular conduction delays.
Results As compared with optimal pharmacologic therapy alone,cardiac-resynchronization therapy with a pacemaker decreasedthe risk of the primary end point (hazard ratio, 0.81; P=0.014),as did cardiac-resynchronization therapy with a pacemakerdefibrillator(hazard ratio, 0.80; P=0.01). The risk of the combined end pointof death from or hospitalization for heart failure was reducedby 34 percent in the pacemaker group (P<0.002) and by 40percent in the pacemakerdefibrillator group (P<0.001for the comparison with the pharmacologic-therapy group). Apacemaker reduced the risk of the secondary end point of deathfrom any cause by 24 percent (P=0.059), and a pacemakerdefibrillatorreduced the risk by 36 percent (P=0.003).
Conclusions In patients with advanced heart failure and a prolongedQRS interval, cardiac-resynchronization therapy decreases thecombined risk of death from any cause or first hospitalizationand, when combined with an implantable defibrillator, significantlyreduces mortality.
Source Information
From the University of Colorado Health Sciences Center, Denver (M.R.B.); the University of Southern California, Los Angeles (L.A.S.); Milton S. Hershey Medical Center, Hershey, Pa. (J.B.); Bryan Memorial Hospital, Lincoln, Nebr. (S.K.); Johns Hopkins Hospital, Baltimore (D.A.K.); Moffit Hospital, University of California, San Francisco, San Francisco (T.D.M.); Washington, D.C., Veterans Affairs Medical Center, Washington, D.C. (P.C.); Pfizer Global Research and Development, Ann Arbor, Mich. (L.D.); University of WisconsinMadison Medical School, Madison (D. DeMets); Clinical Cardiovascular Research, Gaithersburg, Md. (B.G.W.); Guidant Corporation, St. Paul, Minn. (D. DeVries); and Jefferson Medical College, Philadelphia (A.M.F.).
Address reprint requests to Dr. Bristow at the Division of Cardiology, University of Colorado Health Sciences Center, 4200 E. Ninth Ave., Denver, CO 80262, or at michael.bristow{at}uchsc.edu.
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