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Pacing-facilitated Short-long-short Sequences Leading to Ventricular Tachyarrhythmias: A Brief Report.
J Innov Card Rhythm Manag
September 2024
Heart Rhythm Services, Division of Cardiovascular Diseases, St. Rita's Medical Center, Lima, OH, USA.
Pacing-induced recurrent short-long-short sequences constitute an important yet overlooked mechanism for triggering ventricular tachyarrhythmias in patients with cardiovascular implantable electric devices. A careful and thorough retrospective analysis of patients' electrograms allows for a timely diagnosis with appropriate management.
View Article and Find Full Text PDFInappropriate ventricular pacing-induced ventricular fibrillation in a long QT type 3 syndrome patient with implantable cardioverter-defibrillator.
HeartRhythm Case Rep
August 2024
Department of Cardiorenal and Cerebrovascular Medicine, Faculty of Medicine, Kagawa University, Kagawa, Japan.
Spatially discordant alternans due to periodic pacing site alternation.
Heart Rhythm
July 2024
Department of Pharmacology, University of California, Davis, California. Electronic address:
Background: Bidirectional ventricular tachycardia (BVT) is a rare type of ventricular tachycardia that is characterized by a beat-to-beat alternation in the QRS axis. Previous studies have shown that it is caused by alternating focal activities from 2 locations.
Objective: This study proposes a novel mechanism for the formation of spatially discordant alternans (SDA) due to the periodic pacing site alternation that occurs in BVT.
Increased heart rate fragmentation in those with Williams-Beuren syndrome suggests nonautonomic mechanistic contributors to sudden death risk.
Am J Physiol Heart Circ Physiol
August 2024
Translational Vascular Medicine Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States.
Williams-Beuren syndrome (WBS) is a rare genetic condition caused by a chromosomal microdeletion at 7q11.23. It is a multisystem disorder characterized by distinct facies, intellectual disability, and supravalvar aortic stenosis (SVAS).
View Article and Find Full Text PDFBackground: The effect of cardiac resynchronization therapy (CRT) on the risk of ventricular arrhythmias is controversial. Several studies reported a decreased risk, but some studies reported a potential proarrhythmic effect of epicardial left ventricular pacing resolved upon discontinuation of biventricular pacing (BiVp).
Case Summary: A 67-year-old woman with a history of heart failure due to nonischemic cardiomyopathy and left bundle branch block was hospitalized for CRT device implantation.
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