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Wave emission on interacting heterogeneities in cardiac tissue
Marcel Hörning1, Seiji Takagi, Kenichi Yoshikawa
1Department of Physics, Kyoto University, Japan. marcel@chem.scphys.kyoto-u.ac.jp
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
Summary
Far-field pacing (FFP) can terminate cardiac arrhythmias by using tissue heterogeneities. This study shows that secondary obstacles and local depolarization sites significantly modulate FFP
Area of Science:
- Cardiovascular Science
- Biophysics
- Computational Biology
Background:
- Cardiac arrhythmias are linked to spiral waves that can become pinned to tissue heterogeneities.
- Far-field pacing (FFP) offers a potential method to terminate these waves by utilizing internal pacing sites.
- Understanding obstacle interactions is crucial for optimizing FFP efficacy.
Purpose of the Study:
- To investigate the role of multiple obstacles and their interactions during far-field pacing.
- To explore how secondary obstacles and local depolarization sites influence wave propagation and energy requirements.
- To validate theoretical findings using experimental cardiac tissue models.
Main Methods:
- Theoretical modeling of spiral wave dynamics and far-field pacing.
- Simulations incorporating multiple obstacles and varying tissue properties.
- Experimental validation using cardiomyocyte monolayers and tissue culture.
Main Results:
- A secondary obstacle significantly modulates the minimum electrical field required for FFP.
- Domain formation from isotropic cell distribution leads to localized depolarization sites.
- Both secondary obstacles and localized depolarization sites affect the energy needed to initiate wave propagation.
Conclusions:
- The interaction of obstacles and local depolarization patterns critically influences far-field pacing effectiveness.
- Cardiac tissue culture serves as a valid model for simulating heart activity and FFP.
- Findings provide insights for the future clinical application of FFP in treating cardiac arrhythmias.
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