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Unexpected response to a common pacing maneuver during tachycardia.
Heart Rhythm
November 2024
University of Alabama at Birmingham, Birmingham, Alabama; VA Health Care System, Birmingham, Alabama. Electronic address:
In the case of adenosine-sensitive atrial tachycardia originating near the atrioventricular (AV) node, overdrive pacing from the anterior right atrium showed constant and progressive fusion, indicating that the pacing site is proximal to slow conduction. Shortening the pacing cycle length prolonged conduction times to the orthodromic capture sites; they remained unchanged at the antidromic capture sites. Limited decremental conduction property in the slow conduction zone supports the hypothesis that AV node-like tissue remnants along the AV annulus are involved.
View Article and Find Full Text PDFSinoatrial node heterogeneity and fibroblasts increase atrial driving capability in a two-dimensional human computational model.
Front Physiol
July 2024
Department of Electrical, Electronic, and Information Engineering "Guglielmo Marconi", University of Bologna, Cesena, Italy.
Cardiac pacemaking remains an unsolved matter from many perspectives. Extensive experimental and computational studies have been performed to describe the sinoatrial physiology across different scales, from the molecular to clinical levels. Nevertheless, the mechanism by which a heartbeat is generated inside the sinoatrial node and propagated to the working myocardium is not fully understood at present.
View Article and Find Full Text PDFRipple map delineation of the reentrant circuit in a tricuspid annular atrial tachycardia mimicking focal activity.
Indian Pacing Electrophysiol J
June 2024
Cardiovascular Center, Sakurabashi Watanabe Hospital, Osaka, Japan. Electronic address:
A 70-year-old man with hypertensive heart disease underwent catheter ablation of persistent atrial fibrillation. After completing the pulmonary vein isolation, atrial burst pacing induced an annular atrial tachycardia (AT). Overdrive pacing exhibited constant fusion, indicating a macroreentrant mechanism of the AT.
View Article and Find Full Text PDFAtrial overdrive pacing during right bundle branch tachycardia: What is the mechanism?
HeartRhythm Case Rep
April 2024
Section of Cardiac Electrophysiology, Cardiovascular Medicine Division, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.
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