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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
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Mechano-electrical feedback explains T-wave morphology and optimizes cardiac pump function: insight from a

Evelien Hermeling1, Tammo Delhaas, Frits W Prinzen

  • 1Department of Biomedical Engineering, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands. e.hermeling@maastrichtuniversity.nl

Progress in Biophysics and Molecular Biology
|July 28, 2012
PubMed
Summary

Mechano-electrical feedback (MEF) explains T-wave memory, a phenomenon where ECG T-waves change after ventricular pacing. This slow-acting feedback mechanism optimizes cardiac function by coordinating electrical and mechanical activity in the left ventricle.

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Area of Science:

  • Cardiology
  • Computational Biology
  • Physiology

Background:

  • T-wave memory, characterized by discordant T- and R-waves post-ventricular pacing, is known to be mechanically mediated.
  • The precise mechanism underlying T-wave memory remains incompletely understood.

Purpose of the Study:

  • To investigate the hypothesis that slow-acting mechano-electrical feedback (MEF) explains T-wave memory.
  • To elucidate the role of MEF in cardiac electrophysiology and mechanical function.

Main Methods:

  • A mathematical model simulating electromechanical behavior of the left ventricle (LV) was developed.
  • The model incorporated ionic membrane currents, calcium handling, excitation-contraction coupling, and MEF by adjusting L-type calcium current conductivity based on local external work.
  • Simulations included normal sinus rhythm (SR), acute ventricular pacing (VP), sustained VP with MEF, and restored SR.

Main Results:

  • MEF resulted in T-wave concordance during normal SR and discordant T-waves immediately after restoring SR, mimicking T-wave memory.
  • Simulated ECGs with 25-50% MEF adaptation closely matched in vivo T-wave memory experiments.
  • Optimal systolic and diastolic function was achieved with 25-50% MEF adaptation.

Conclusions:

  • Slow-acting MEF in the LV can explain T-wave memory.
  • MEF accounts for small variations in systolic shortening and mechanical work during SR, minimal repolarization time dispersion, and T-wave concordance.
  • The physiological distribution of electrophysiological properties, influenced by MEF, optimizes cardiac pump function.