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  Vol. 289 No. 20, May 28, 2003 TABLE OF CONTENTS
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Combined Cardiac Resynchronization and Implantable Cardioversion Defibrillation in Advanced Chronic Heart Failure

The MIRACLE ICD Trial

James B. Young, MD; William T. Abraham, MD; Andrew L. Smith, MD; Angel R. Leon, MD; Randy Lieberman, MD; Bruce Wilkoff, MD; Robert C. Canby, MD; John S. Schroeder, MD; L. Bing Liem, DO; Shelley Hall, MD; Kevin Wheelan, MD; for The Multicenter InSync ICD Randomized Clinical Evaluation (MIRACLE ICD) Trial Investigators

JAMA. 2003;289:2685-2694.

Context  Cardiac resynchronization therapy (CRT) through biventricular pacing is an effective treatment for heart failure (HF) with a wide QRS; however, the outcomes of patients requiring CRT and implantable cardioverter defibrillator (ICD) therapy are unknown.

Objective  To examine the efficacy and safety of combined CRT and ICD therapy in patients with New York Heart Association (NYHA) class III or IV congestive HF despite appropriate medical management.

Design, Setting, and Participants  Randomized, double-blind, parallel-controlled trial conducted from October 1, 1999, to August 31, 2001, of 369 patients with left ventricular ejection fraction of 35% or less, QRS duration of 130 ms, at high risk of life-threatening ventricular arrhythmias, and in NYHA class III (n = 328) or IV (n = 41) despite optimized medical treatment.

Interventions  Of 369 randomized patients who received devices with combined CRT and ICD capabilities, 182 were controls (ICD activated, CRT off) and 187 were in the CRT group (ICD activated, CRT on).

Main Outcome Measures  The primary double-blind study end points were changes between baseline and 6 months in quality of life, functional class, and distance covered during a 6-minute walk. Additional outcome measures included changes in exercise capacity, plasma neurohormones, left ventricular function, and overall HF status. Survival, incidence of ventricular arrhythmias, and rates of hospitalization were also compared.

Results  At 6 months, patients assigned to CRT had a greater improvement in median (95% confidence interval) quality of life score (–17.5 [–21 to –14] vs –11.0 [–16 to –7], P = .02) and functional class (–1 [–1 to –1] vs 0 [–1 to 0], P = .007) than controls but were no different in the change in distance walked in 6 minutes (55 m [44-79] vs 53 m [43-75], P = .36). Peak oxygen consumption increased by 1.1 mL/kg per minute (0.7-1.6) in the CRT group vs 0.1 mL/kg per minute (–0.1 to 0.8) in controls (P = .04), although treadmill exercise duration increased by 56 seconds (30-79) in the CRT group and decreased by 11 seconds (–55 to 12) in controls (P<.001). No significant differences were observed in changes in left ventricular size or function, overall HF status, survival, and rates of hospitalization. No proarrhythmia was observed and arrhythmia termination capabilities were not impaired.

Conclusions  Cardiac resynchronization improved quality of life, functional status, and exercise capacity in patients with moderate to severe HF, a wide QRS interval, and life-threatening arrhythmias. These improvements occurred in the context of underlying appropriate medical management without proarrhythmia or compromised ICD function.


Author Affiliations: Cleveland Clinic Foundation, Cleveland, Ohio (Drs Young and Wilkoff); University of Kentucky, Lexington (Dr Abraham); Emory University School of Medicine, Atlanta, Ga (Drs Smith and Leon); Harper Hospital, Detroit, Mich (Dr Lieberman); Texas Cardiac Arrhythmia, Austin (Dr Canby); Stanford University Medical Center, Stanford, Calif (Drs Schroeder and Liem); and Baylor University Medical Center, Dallas, Tex (Drs Hall and Wheelan). Dr Abraham is now with Ohio State University, Columbus.


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Combining Resynchronization and Defibrillation Therapies for Heart Failure
David J. Bradley
JAMA. 2003;289(20):2719-2721.
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