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Cellular basis for QT dispersion

C Antzelevitch1, W Shimizu, G X Yan

  • 1Masonic Medical Research Laboratory, Utica, New York 13504, USA.

Journal of Electrocardiology
|April 16, 1998
PubMed
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Transmural dispersion of repolarization, measured by the T-wave peak-to-end interval, is a key factor in QT dispersion and arrhythmia risk. This study reveals how M cell action potential duration influences this dispersion in canine ventricles.

Area of Science:

  • Cardiac Electrophysiology
  • Cardiovascular Physiology
  • Arrhythmogenesis

Background:

  • QT interval dispersion on body surface ECGs is incompletely understood.
  • Ventricular repolarization heterogeneities, particularly transmural gradients, contribute to QT dispersion and arrhythmia risk.
  • Action potential duration (APD) differences along transmural, apicobasal, and anteroposterior axes influence repolarization time.

Purpose of the Study:

  • To investigate the cellular basis of transmural repolarization dispersion.
  • To correlate transmural repolarization gradients with T-wave morphology and QT dispersion.
  • To evaluate the T-wave peak-to-end interval as an index of arrhythmia risk.

Main Methods:

  • Utilized an arterially perfused canine left ventricular wedge preparation.

Related Experiment Videos

  • Recorded and analyzed action potentials and voltage gradients during repolarization.
  • Investigated the effects of drugs known to modulate QT dispersion on transmural repolarization.

    • Main Results:

    • Transmural voltage gradients during repolarization significantly contribute to T-wave inscription.
    • The T-wave peak-to-end interval accurately represents transmural dispersion of repolarization.
    • Drugs augmenting or diminishing QT dispersion preferentially affected M cell APD or epicardial/endocardial APD, respectively.
    • Abnormal T-wave morphology (broad, low amplitude, bifurcated) correlates with diminished repolarizing forces and increased arrhythmia risk.

    Conclusions:

    • Regional differences in M cell action potential duration are fundamental to QT dispersion under normal and long QT conditions.
    • The T-wave peak-to-end interval serves as a valuable index for assessing ventricular arrhythmia risk.
    • Abnormal T-wave characteristics, especially in long QT syndrome, indicate diminished repolarizing forces and predict EAD-induced triggered beats and torsade de pointes.