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Activation dynamics in anisotropic cardiac tissue via decoupling.
John C Clements1, Jukka Nenonen, P K J Li
1Department of Mathematics and Statistics, Dalhousie University, Halifax, Canada. john.clements@dal.ca
Annals of Biomedical Engineering
|August 10, 2004
Summary
A new decoupled model simplifies cardiac electrical activation simulation by omitting passive tissue effects. This approach may adequately represent cardiac dynamics in whole heart models.
Area of Science:
- Biophysics
- Computational Biology
- Cardiac Electrophysiology
Background:
- The bidomain theory models cardiac tissue as two interpenetrating anisotropic media.
- Electrical activation propagation involves complex coupled partial differential equations.
Purpose of the Study:
- To assess the impact of neglecting extracardiac tissue and blood masses on wave propagation.
- To develop and validate a simplified, decoupled model for cardiac activation simulation.
Main Methods:
- Developing a decoupling procedure for the bidomain model.
- Utilizing a dimensionless parameter epsilon for model justification.
- Performing numerical simulations comparing full, isolated, and decoupled bidomain models.
Main Results:
- The decoupled model offers a simplified approach to simulating cardiac electrical activation.
- Preliminary simulations suggest the decoupled model's adequacy for whole heart models.
- The decoupling procedure is independent of assumptions on anisotropic conductivities.
Conclusions:
- Neglecting passive extracardiac tissue and blood masses may be acceptable for certain whole heart models.
- The proposed decoupled model provides a computationally efficient alternative for studying cardiac dynamics.
- Further validation is warranted for diverse cardiac conditions.