Published online before print May 31, 2005, doi: 10.1161/CIRCULATIONAHA.104.526673
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(Circulation. 2005;111:2898-2905.)
© 2005 American Heart Association, Inc.
Arrhythmia/Electrophysiology |
Appropriate and Inappropriate Ventricular Therapies, Quality of Life, and Mortality Among Primary and Secondary Prevention Implantable Cardioverter Defibrillator Patients
Results From the Pacing Fast VT REduces Shock ThErapies (PainFREE Rx II) Trial
From Brigham and Women’s Hospital and Harvard Medical School, Boston, Mass (M.O.S.); Vanderbilt University Medical Center, Nashville, Tenn (M.S.W.); University of Pennsylvania, Philadelphia, Pa (K.V.); Amarillo Heart Group, Amarillo, Tex (I.A.); and Medtronic, Inc, Minneapolis, Minn (P.J.D., M.F.O., A.J.S.).
Correspondence to Michael O. Sweeney, MD, Cardiac Arrhythmia Service, Brigham and Women’s Hospital, 75 Francis St, Boston, MA 02115. E-mail mosweeney{at}partners.org
Received November 30, 2004; revision received February 3, 2005; accepted March 1, 2005.
Background— Implantable cardioverter defibrillators (ICDs) reduce mortality in primary and secondary prevention. Quality of life, mortality, appropriate therapies for specific ventricular rhythms, and inappropriate therapies for supraventricular tachycardia (SVT) were compared among 582 patients (primary prevention=248; secondary prevention=334) in PainFREE Rx II, a 634-patient prospective, randomized study of antitachycardia pacing or shocks for fast ventricular tachycardia (FVT).
Methods and Results— ICDs were programmed identically with 3 zones (ventricular tachycardia [VT] <188 bpm; FVT=188 to 250 bpm; ventricular fibrillation [VF] >250 bpm) but randomized to antitachycardia pacing or shock as initial therapy for FVT. All treated episodes with electrograms were adjudicated. Primary prevention patients had lower ejection fractions and more coronary artery disease. ß-Blocker use, antiarrhythmic drug use, and follow-up duration were similar. Over 11±3 months, 1563 treated episodes were classified as VT (n=740), FVT (n=350), VF (n=77), and SVT (n=396). The distribution of VT, FVT, and VF was not different between primary and secondary prevention patients (respectively, VT 52% versus 54%, FVT 35% versus 35%, and VF 14% versus 10%). More secondary prevention patients had appropriate therapies (26% versus 18%, P=0.02), but among these patients, the median number of episodes per patient was similar. Inappropriate therapies occurred in 15% of both groups and accounted for similar proportions of all detected and treated episodes (46% in primary prevention patients versus 34% in secondary prevention patients, P=0.09). Quality of life improved modestly in both groups, and mortality was similar.
Conclusions— Primary prevention patients are slightly less likely to have appropriate therapies than secondary prevention patients, but episode density is similar among patients with appropriate therapies. SVT resulted in more than one third of therapies in both groups, but quality of life and mortality were similar.
Key Words: death, sudden • mortality • defibrillators, implantable • tachycardia, ventricular • tachycardia, supraventricular
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