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QRS Duration Does Not Predict Occurrence of Ventricular Tachyarrhythmias in Patients With Implanted Cardioverter-Defibrillators

Alfred E. Buxton, MD, FACC^_*,_*, Michael O. Sweeney, MD, FACC, Mark S. Wathen, MD, Mark E. Josephson, MD, FACC, Mary F. Otterness, MS^||, Elaine Hogan-Miller, PhD, RN^||, Alice J. Stark, PhD, RN^||, Paul J. DeGroot, MS^|| for the PainFREE Rx II Investigators

^_* Cardiology Division, Department of Medicine, Brown Medical School, Providence, Rhode Island
Brigham and Women’s Hospital, Boston, Massachusetts
Vanderbilt University Medical Center, Nashville, Tennessee
Beth Israel Deaconess Medical Center, Boston, Massachusetts
^|| Medtronic, Inc., Minneapolis, Minnesota

View larger version (7K): [in a new window]   Figure 1 Time to ventricular tachycardia/ventricular fibrillation by QRS duration (QRSd) in days. There were 95 patients with events, and the log-rank p value was 0.85. Solid line = QRSd >120 ms group; broken line = QRSd 120 ms group.

View larger version (7K): [in a new window]   Figure 2 Time to ventricular tachycardia/ventricular fibrillation or all-cause death by QRS duration (QRSd). There were 129 patients with events, and the log-rank p value was 0.20. Solid line = QRSd >120 ms group; broken line = QRSd 120 ms group.