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Postextrasystolic Changes in the Complexity of the QRS Complex and T Wave

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We tested the hypothesis that ventricular repolarization of the first sinus beat following a ventricular premature beat (VPB) can be modulated in the absence of clearly discernible T-wave changes. We applied principal component analysis (PCA) to assess QRS and T-wave complexity of sinus beats preceding and following VPBs in multiple 10-second resting 12-lead electrocardiograms of two subjects with frequent VPBs and no apparent heart disease. In both subjects, T-wave complexity of the first post-VPB beat was significantly increased compared to the beats preceding the VPB.

Ann Noninvasive Electrocardiol 2008;13(4):421–425
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Keywords: T wave; postextrasystolic T wave changes; ventricular repolarization

Document Type: Research Article

Affiliations: Division of Cardiac and Vascular Sciences, St. George's University of London, Cranmer Terrace, London, United Kingdom

Publication date: October 1, 2008

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