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Related Experiment Videos

Progress toward controlling in vivo fibrillating sheep atria using a nonlinear-dynamics-based closed-loop feedback

Daniel J. Gauthier1, G. Martin Hall, Robert A. Oliver

  • 1Department of Physics and Department of Biomedical Engineering, Duke University and Center for Nonlinear and Complex Systems, Box 90305, Durham, North Carolina 27708.

Chaos (Woodbury, N.Y.)
|June 5, 2003
PubMed
Summary

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This study explored controlling atrial fibrillation in sheep using closed-loop feedback pacing. The protocol aimed to regularize heart rhythms but was found ineffective due to refractory period issues.

Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Control Systems

Background:

  • Atrial fibrillation (AF) is a complex cardiac arrhythmia.
  • Controlling cardiac dynamics in vivo presents significant challenges.
  • Physiologically relevant models are crucial for developing effective interventions.

Purpose of the Study:

  • To investigate the feasibility of controlling in vivo atrial fibrillation using a closed-loop feedback protocol.
  • To assess the effectiveness of pacing interventions in regularizing cardiac dynamics.
  • To explore the application of control algorithms in a physiologically relevant cardiac preparation.

Main Methods:

  • Utilized a closed-loop feedback system to monitor and control sheep atrial dynamics.
  • Applied single-site electrical pacing perturbations to suppress fibrillation.

Related Experiment Videos

  • Measured spatial-temporal responses using a multi-channel electronic recording system.
  • Employed a control algorithm to adjust shock timing based on inter-activation intervals.

    • Main Results:

    • The closed-loop feedback protocol was not effective in regularizing atrial fibrillation dynamics.
    • The control system often attempted to pace the atrium during its refractory period, failing to induce activation.
    • Probability distributions indicated a lack of significant regularization of inter-activation time intervals.

    Conclusions:

    • The described single-sided pacing feedback protocol failed to suppress or regularize in vivo atrial fibrillation in sheep.
    • The refractory period of cardiac tissue poses a significant challenge for real-time feedback control systems.
    • Further research is needed to refine control strategies for cardiac arrhythmias, potentially involving dual-sided pacing or alternative sensing methods.