Author + information
- Received April 10, 1996
- Revision received July 16, 1996
- Accepted August 14, 1996
- Published online December 1, 1996.
- Sami Viskin, MD (, )
- Karin Heller, MD,
- Hal V. Barron, MD,
- Ilan Kitzis, MD,
- Mohamed Hamdan, MD,
- Jeffrey E. Olgin, MD,
- Mary J. Wong, RN, MSN,
- Stanley E. Grant and
- Michael D. Lesh, MD, FACC⁎
- ↵⁎Address for correspondence: Dr. Michael D. Lesh, Cardiac Electrophysiology, University of California, MU East Tower 4th Floor, Box 1354, 500 Parnassus Avenue, San Francisco, California 94143.
Objectives We attempted to determine the correlation between the presence of postextrasystolic changes in the STU segment and a history of sustained ventricular arrhythmias.
Background Postextrasystolic U wave augmentation (a marked increment in U wave amplitude after premature ventricular complexes [PVCs]) is an adverse prognostic sign in the “pause-dependent long QT syndrome.” However, the prevalence of post-extrasystolic changes in patients without the long QT syndrome is unknown.
Methods We compared the configuration of the STU segment of the postextrasystolic beat (the sinus beat after a PVC) with the STU configuration during sinus rhythm in three patient groups: 1) 41 patients with spontaneous ventricular tachycardia/ fibrillation (VT/VF) (VT/VF group), 2) 63 patients with heart disease and high grade ventricular arrhythmias (control group), and 3) 29 patients with high grade ventricular arrhythmias but no heart disease (reference group).
Results Postextrasystolic T wave changes did not correlate with a history of ventricular tachyarrhythmias. However, postextrasys-tolic U wave changes were more common among the patients with VT/VF than among control subjects (39% vs. 8.7%, p < 0.001). By logistic multiple regression analysis, a low left ventricular ejection fraction (p < 0.001) and postextrasystolic U wave changes (p < 0.005) were independent predictors of ventricular tachyarrhythmias.
Conclusions Postextrasystolic T wave changes are common and lack predictive value. Postextrasystolic U wave changes may be a specific marker of a tendency to the development of spontaneous ventricular arrhythmias. Prospective studies should be performed to confirm this association.
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- Received April 10, 1996.
- Revision received July 16, 1996.
- Accepted August 14, 1996.
- American College of Cardiology