Transmural conduction time in an early repolarization syndrome model

Yoon,Namsik; Jeong,Hyung Ki; Lee,Ki Hong; Park,Hyung Wook; Cho,Jeong Gwan

doi:10.3892/etm.2020.9061

Transmural conduction time in an early repolarization syndrome model

Authors:
- Namsik Yoon
- Hyung Ki Jeong
- Ki Hong Lee
- Hyung Wook Park
- Jeong Gwan Cho
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Affiliations: Department of Cardiovascular Medicine, Heart Center of Chonnam National University Hospital, Chonnam National University Medical School, Chonnam National University, Dong‑gu, Gwangju 61469, Republic of Korea
Published online on: July 28, 2020 https://doi.org/10.3892/etm.2020.9061
Pages: 3064-3071
Copyright: © Yoon et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 4.0].

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Abstract

In the pathological aspect of J wave syndrome, delayed depolarization is defined as the difference in local conduction velocity of the ventricular myocardium. If polymorphic ventricular tachycardia is induced without local conduction velocity heterogeneity, this contradicts the delayed depolarization theory. In the present study, the transmural conduction time at was evaluated at several transmural locations in a canine early repolarization model. The transmural pseudo‑electrocardiogram and endocardial/epicardial action potentials were recorded from coronary‑perfused canine left ventricular wedge preparations (n=18). The Ito agonist NS5806 (9‑10 µM), Ca2+ channel blocker verapamil (2 µM) and acetylcholine (ACh) (2 µM) were used to pharmacologically mimic early repolarization syndrome genotypes. The transmural conduction times were measured at five fixed epicardial unipolar electrodes before and after the perfusion of provocative agents. The transmural conduction time was defined as the time from endocardial stimulation to the maximal negative deflection (dV/dt) of the endocardial electrogram at the unipolar electrode. Polymorphic ventricular tachycardia developed in 14/18 preparations. In the transmembrane action potentials, there was no definite delayed phase 0 upstroke in any induced polymorphic ventricular tachycardia preparations. In all preparations, the transmural conduction time increased significantly after perfusing the Ito agonist NS5806, verapamil and Ach; however, the increase was only 2.6±0.4 msec, and dispersion of the transmural conduction time did not exhibit significant heterogeneity (7.16±0.93 vs. 7.76±1.21 msec; P=0.240). In the early repolarization model, polymorphic ventricular tachycardia was induced without any regional conduction velocity heterogeneity. This finding suggests that local depolarization heterogeneity would not be a major contributor to the generation of ventricular arrhythmia in the early repolarization syndrome wedge preparation model.

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