title: Postextrasystolic changes in the complexity of the QRS complex and T wave.
abstract: 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.
authors.affiliation: The Division of Cardiac and Vascular Sciences, St. George's University of London, Cranmer Terrace, London, United Kingdom. vbatchva@sgul.ac.uk
authors.forename: Velislav N
authors.initials: VN
authors.lastname: Batchvarov
authors.forename: A John
authors.initials: AJ
authors.lastname: Camm
mesh_terms: D000328:Adult; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D018879:Ventricular Premature Complexes / Q000503:physiopathology*