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Related Experiment Videos

Simulated sinoatrial exit blocks explained by circle map analysis.

P Ostborn1, G Ohlén, B Wohlfart

  • 1Department of Mathematical Physics, Lund University, Lund, S-221 00, Sweden. per.ostborn@matfys.lth.se

Journal of Theoretical Biology
|July 11, 2001
PubMed
Summary

Simulations show that sinus node arrhythmias, like those seen in poor coupling, can be replicated by replacing the inner sinus node with a stimulator. This reveals generic properties of cardiac arrhythmias.

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Area of Science:

  • Computational biology
  • Cardiac electrophysiology
  • Nonlinear dynamics

Background:

  • Cardiac arrhythmias can arise from impaired intercellular coupling in the sinus node.
  • A two-element model with leakage current mimicked arrhythmias observed in poor coupling scenarios.

Purpose of the Study:

  • To investigate the dynamics of the sinus node periphery using a periodic stimulator.
  • To identify the phase response curves and bifurcations leading to cardiac arrhythmias.

Main Methods:

  • Simulated phase response curves for sinus node elements with leakage under varying depolarizing stimuli.
  • Utilized circle maps based on simulated curves to model system dynamics.
  • Analyzed sequences of exit block and identified bifurcations.

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Main Results:

  • Simulations replicated the sequence of exit block progression observed in reduced coupling.
  • Circle map dynamics mirrored the two-element system's behavior as coupling strength decreased.
  • Phase response curve properties were linked to fundamental membrane current characteristics.

Conclusions:

  • The dynamics of the sinus node periphery are predictable via phase response curves.
  • Observed cardiac rhythms and bifurcations appear to be generic phenomena.
  • This suggests underlying universal principles governing sinus node function and dysfunction.