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Related Experiment Videos

Evidence for chaotic behavior in driven ventricles.

G V Savino1, L Romanelli, D L González

  • 1Bioingeniería, Instituto Superior de Investigaciones Biológicas, Universidad Nacional de Tucumán, Buenos Aires.

Biophysical Journal
|August 1, 1989
PubMed
Summary
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Cardiac tissue exhibits universal chaotic dynamics, with bifurcations and irregular behavior observed in toad ventricles. These findings suggest a link between chaotic dynamics and cardiac fibrillation.

Area of Science:

  • Cardiology
  • Nonlinear Dynamics
  • Computational Biology

Background:

  • Cardiac tissue exhibits complex electrophysiological dynamics.
  • Understanding these dynamics is crucial for diagnosing and treating arrhythmias.

Purpose of the Study:

  • To investigate the dynamic characteristics of cardiac ventricles under periodic stimulation.
  • To identify potential chaotic dynamics within cardiac electrophysiology.

Main Methods:

  • Recording monophasic action potential (MAP) signals from excised and in situ toad ventricles.
  • Applying external periodic electrical pulses and systematically increasing stimulation frequency.
  • Analyzing MAP signals using techniques like power spectrum, autocorrelation function, Poincaré map, and phase portrait.

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Main Results:

  • Observed phase-locking and period-doubling sequences leading to chaotic behavior.
  • Identified subharmonic bifurcations (order one and two) and chaotic-like behavior in MAP signals within a specific frequency range.
  • Demonstrated no qualitative differences in dynamics between excised and in situ ventricles.

Conclusions:

  • Bifurcations and irregular behavior indicate local universal chaotic dynamics in cardiac tissue.
  • Cardiac fibrillation may be related to observed chaotic dynamics, though further research is needed to confirm equivalence.
  • The study provides insights into the complex nonlinear dynamics governing cardiac electrophysiology.