Cited by 59Cardiac electrophysiology and arrhythmiasCardiac pacing and defibrillation studiesCardiac Arrhythmias and Treatments

Altered ventricular stretch contributes to initiation of cardiac memory

Sosunov, Eugene A., Anyukhovsky, Evgeny P., Rosen, Michael R.·2008·Heart Rhythm

Abstract

Background Cardiac memory is a change in T-wave morphology induced by ventricular pacing or arrhythmias that persist after resumption of normal AV conduction. Changing the pacemaker site from atrium to ventricle alters ventricular activation and the mechanical pattern of ventricular contraction. Either or both alterations affect T-wave configuration.Objective The purpose of this study was to study the role of altered contractile patterns on initiation of cardiac memory.Methods Isolated rabbit hearts were immersed in Tyrode's solution (37 degrees C) and aortically perfused at a constant pressure of 70 mmHg. Three orthogonal quasi-ECG leads were recorded via six Ag-AgCl electrodes located on the walls of the bath. Hearts were paced at a constant cycle length from either the right atrial appendage or left ventricle lateral wall. The pulmonary artery was sealed, and both ventricles contracted isovolumetrically. Cardiac memory was quantified as T-wave vector displacement expressed as distance between T-wave vector peaks during atrial pacing before and after ventricular pacing.Results Five minutes of ventricular pacing induced significant T-wave vector displacement that returned to control in 5 to 10 minutes. No significant changes in intraventricular pressure occurred during and after ventricular pacing. Interventions that decreased ventricular load (shunting both ventricles to the bath) or contractility (excitation-contraction uncoupler blebbistatin) significantly decreased developed pressure and eliminated T-wave vector displacement. Neither intervention affected ventricular activation during ventricular pacing. Locally applied left ventricular epicardial stretch induced T-wave vector displacement similar to that induced by ventricular pacing.Conclusion Altered ventricular activation during ventricular pacing initiates cardiac memory via induction of altered contractile patterns and altered stretch.

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Crossref · 10.1016/j.hrthm.2007.09.008

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  • Altered ventricular stretch and induction of altered contractile patterns contribute to the initiation of cardiac memory.

    “Altered ventricular stretch and induction of altered contractile patterns and altered ventricular stretch were demonstrated to contribute to the initiation of cardiac memory.35”

    From The Year of 2008 in Electrocardiology (2010) · cites this paper as [35]

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Authors
Sosunov, E. A., Anyukhovsky, E. P., & Rosen, M. R.
Affiliations
  • Columbia University Irving Medical Center (US)
  • Columbia University (US)
Venue
Heart Rhythm
Publisher
Elsevier BV
Published
2008-01
Volume
5
Issue
1
Pages
106-113
ISSN
1547-5271 (ISSN-L)
OpenAlex
W1993544662
Cited by
59
References
28
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2022: 2 · 2020: 4 · 2019: 4 · 2018: 4 · 2017: 2 · 2016: 2 · 2015: 4 · 2014: 4 · 2013: 2 · 2012: 7
FWCI
3.99
Type
journal article
Language
en
Open access
closed
Locations
  • Heart Rhythm (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL-67101, HL-28958)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac pacing and defibrillation studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Arrhythmias and Treatments
Keywords
cardiac memory, ventricular pacing, ventricular contractility, excitation-contraction uncoupling, blebbistatin, ventricular activation, T-wave morphology, isolated perfused heart
MeSH terms
Action Potentials, Animals, Cardiac Pacing, Artificial, Heart Conduction System, Male, Myocardial Contraction, Myocardium, Pericardium, Rabbits, Ventricular Function, Mechanotransduction, Cellular

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