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Related Experiment Videos

Altered T wave dynamics in a contracting cardiac model.

Nicolas P Smith1, Martin L Buist, Andrew J Pullan

  • 1Institute of Bioengineering, Department of Engineering Science, The University of Auckland, Auckland, New Zealand. np.smith@auckland.ac.nz

Journal of Cardiovascular Electrophysiology
|February 6, 2004
PubMed
Summary

Mechanical deformation of the heart, modeled with coupled electromechanical equations, shifts the T wave on the electrocardiogram (ECG). Cell stretch significantly impacts this temporal shift, influencing cardiac electrical activity.

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Area of Science:

  • Computational biology
  • Biophysics
  • Cardiovascular modeling

Background:

  • Investigating the impact of mechanical deformation on body surface potentials.
  • Utilizing a coupled biophysically based model for analysis.

Purpose of the Study:

  • To analyze the implications of mechanical deformation on calculated body surface potentials.
  • To understand the effect of cardiac contraction on electrical activity and ECG.

Main Methods:

  • Embedding a cardiac excitation-contraction cellular model in a 2D cardiac and torso model.
  • Solving bidomain and finite deformation equations with realistic boundary conditions.
  • Calculating body surface potentials using Laplace's equation.

Main Results:

Related Experiment Videos

  • Cardiac deformation reduces action potential duration by 7 msec in single-cell models.
  • The T wave on the ECG occurs 18 msec earlier in coupled electromechanical models.
  • Separating activation sequence and tissue deformation revealed key contributors to ECG changes.

Conclusions:

  • Mechanical contraction in heart models shifts the ECG T wave earlier.
  • Myocardial deformation reduces T wave amplitude, but cell stretch is the primary driver of temporal shifts.