PMID: 9654230Jul 8, 1998Paper

Origin of heat-induced accelerated junctional rhythm

Journal of Cardiovascular Electrophysiology
B ThibaultM J Janse

Abstract

The application of high-frequency current to the AV junctional area results in a temperature rise in the myocardium and may cause accelerated junctional rhythm (AJR). The aim of the study was to characterize heat-induced AJR in an in vitro animal model. Studies were performed in isolated perfused pig and rabbit hearts. Using a small heating probe, we could induce AJR from a discrete area located in the middle of the triangle of Koch, which was smaller than the area from which RF energy application could elicit AJR. Histology showed that the heat-sensitive area was located over, or close to, the compact AV node. It did not correspond with the areas where double potentials were found or with the site(s) of earliest atrial activation during VA conduction. Microelectrode recordings revealed that AJR arose in nodal-type cells. Heat increased the slope of the phase 4 depolarization and shortened the action potential duration. Two types of AJR were observed: the first one was regular and the second one showed irregularity in the intervals. Interaction of multiple foci and the presence of conduction block between the foci and the His bundle caused the irregularity of the His-His intervals during the second type of AJR. AJR observed dur...Continue Reading

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Citations

Feb 8, 2007·Heart and Vessels·Yuji OkuyamaKazuhisa Kodama
Nov 26, 1999·Journal of Cardiovascular Electrophysiology·T N James
Oct 9, 2013·Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing·Ataallah BagherzadehHamidreza Goodarzynejad
Dec 20, 2011·Journal of Pharmacological and Toxicological Methods·Jens KågströmAnn-Christin Ericson
Aug 19, 2008·Current Problems in Cardiology·Ken W LeeMelvin M Scheinman
Feb 9, 2008·Heart Rhythm : the Official Journal of the Heart Rhythm Society·Youhua Zhang, Todor Mazgalev
Sep 22, 2007·Journal of Electrocardiology·Mohammad Hossein NikooMohammad Ali Sadr-Ameli
Oct 6, 2007·Journal of Cardiovascular Electrophysiology·Nahum A Freedberg
Feb 14, 2006·Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·Eduardo Back Sternick, Luiz Márcio Gerken
Jul 19, 2020·Herzschrittmachertherapie & Elektrophysiologie·Satoshi HiguchiMelvin M Scheinman
Jul 13, 2006·Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology·Z IakobishviliB Strasberg
Apr 16, 2021·Journal of Cardiovascular Electrophysiology·Hariharan SugumarPeter M Kistler

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