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Related Experiment Videos

A computer model of the electrogram: what causes fractionation?

M D Lesh1, J F Spear, M B Simson

  • 1Cardiovascular Section, Hospital of the University of Pennsylvania, Philadelphia 19104.

Journal of Electrocardiology
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Fractionated electrograms in ventricular tachycardia patients can arise from uniform activation encountering increased cellular coupling resistance. This biophysical model explains how local activation may not align with the largest electrogram deflections.

Area of Science:

  • Biophysics
  • Computational Modeling
  • Cardiac Electrophysiology

Background:

  • Fractionated electrograms are common during ventricular tachycardia mapping in coronary artery disease patients.
  • Understanding the generation of these complex signals is crucial for accurate arrhythmia localization.

Purpose of the Study:

  • To develop a biophysically based computer model of electrogram generation.
  • To investigate the mechanisms underlying the formation of fractionated electrograms.

Main Methods:

  • Utilized a computer model simulating volume conductor fields and cellular electrophysiology.
  • Simulated uniform activation wavefronts encountering regions with altered cellular coupling resistance.

Main Results:

Related Experiment Videos

  • Demonstrated that increased cellular coupling resistance can produce fractionated electrograms from uniform activation wavefronts.
  • Showed that local activation timing may not correlate with the most prominent deflections in fractionated electrograms.

Conclusions:

  • Increased cellular coupling resistance is a plausible biophysical mechanism for fractionated electrogram generation.
  • The model provides insights into the complex relationship between electrical activation and recorded electrogram morphology during ventricular tachycardia.