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Control of scroll-wave turbulence using resonant perturbations
S W Morgan1, I V Biktasheva, V N Biktashev
1Department of Mathematical Sciences, University of Liverpool, Liverpool L69 7ZL, United Kingdom.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2008
Summary
This study shows resonant frequency perturbations can suppress scroll wave turbulence in 3D excitable media, offering a faster and less energy-intensive method for cardiac defibrillation.
Area of Science:
- Physics
- Applied Mathematics
- Biomedical Engineering
Background:
- Scroll wave turbulence is a form of spatiotemporal chaos in 3D excitable media like cardiac tissue.
- This chaotic behavior is implicated in cardiac fibrillation, a life-threatening condition.
- Current defibrillation methods often use high-energy single pulses.
Purpose of the Study:
- To investigate methods for suppressing scroll wave turbulence in 3D excitable media.
- To evaluate the efficacy of resonant frequency perturbations compared to non-resonant ones.
- To explore potential improvements for cardiac defibrillation strategies.
Main Methods:
- Investigated two stimulation types: modulation of excitability and extra transmembrane current.
- Applied single pulses and repetitive extra currents with constant and feedback-controlled frequencies.
- Compared resonant versus non-resonant frequency perturbations for turbulence suppression.
Main Results:
- Resonant modulation of excitability and resonant extra current effectively terminate scroll wave turbulence.
- Resonant frequency perturbations are significantly more probable and up to 50 times faster than non-resonant ones.
- Resonant perturbation requires one order of magnitude less strength than clinical single-pulse defibrillation.
Conclusions:
- Resonant frequency perturbations offer a robust and efficient method for controlling 3D scroll wave turbulence.
- This approach demonstrates potential for developing improved, lower-energy cardiac defibrillation techniques.
- The findings extend the understanding of resonant control of chaotic spatiotemporal dynamics to 3D systems.
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