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Electrical heterogeneity within the ventricular wall.

C Antzelevitch1, J Fish

  • 1Masonic Medical Research Laboratory, Utica, NY 13501, USA. ca@mmrl.edu

Basic Research in Cardiology
|January 5, 2002
PubMed
Summary
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Cardiac M cells exhibit unique ionic properties, leading to longer action potential duration and increased transmural dispersion of repolarization. This cellular heterogeneity contributes to arrhythmias in conditions like long QT and Brugada syndromes.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Molecular and Cellular Biology

Background:

  • Ventricular myocardium comprises epicardial, M, and endocardial cells with distinct electrophysiological properties.
  • Epicardial and M cells show a phase 1 notch in action potentials due to transient outward current (I(to)).
  • M cells possess unique ionic currents, including smaller I(Ks) and larger late I(Na) and I(Na-Ca).

Purpose of the Study:

  • To elucidate the ionic basis of M cell electrophysiology and its contribution to cardiac arrhythmias.
  • To correlate cellular action potentials with electrocardiogram (ECG) waveforms using a canine ventricular wedge model.
  • To investigate the role of cellular electrical heterogeneity in congenital long QT and Brugada syndromes.

Main Methods:

  • Utilized the canine arterially perfused ventricular wedge model to record transmembrane action potentials.

Related Experiment Videos

  • Correlated cellular action potentials with ECG waveforms to understand the cellular etiology of ECG abnormalities.
  • Reviewed genetic mutations associated with long QT and Brugada syndromes.

    • Main Results:

    • M cells exhibit longer action potential duration (APD) and a steeper APD-rate relationship compared to other cell types.
    • M cell APD prolongation is exacerbated by Class III antiarrhythmic agents, increasing transmural dispersion of repolarization (TDR).
    • TDR, estimated by QTpeak-QTend interval on ECG, reflects cellular electrical heterogeneity.

    Conclusions:

    • Ionic differences in M cells underlie their unique electrophysiological behavior and contribute to TDR.
    • Amplification of intrinsic electrical heterogeneities is a common mechanism for lethal arrhythmias in long QT and Brugada syndromes.
    • Similar arrhythmogenic mechanisms are implicated in other cardiomyopathies, including heart failure, hypertrophy, ischemia, and infarction.