Key result
An extended bidomain model using spectral techniques successfully calculated transmembrane and potential distributions along a 50-cell fiber in response to a defibrillating current.
The extended bidomain model introduces periodic intracellular conductivity to better represent junctional discontinuities between myocytes, enabling more accurate simulation of cardiac tissue electrophysiology.
Extends fiber-scale defibrillation modeling; leaves open whole-heart validation before clinical translation.
The classical bidomain model of cardiac tissue views the intracellular and extracellular (interstitial) spaces as two coupled but separate continua. In the present study, the classical bidomain model has been extended by introducing a periodic conductivity in the intracellular space to represent the junctional discontinuity between abutting myocytes. In this model the junctional region of a myocyte is represented in a way that permits variation of junction size and conductivity profile. Employing spectral techniques, a new method was developed for solving the coupled differential equations governing the intracellular and extracellular potentials in a tissue preparation of finite dimensions. Different spectral representations are used for the aperiodic intra- and extracellular potentials (finite Fourier integral transform) and for the periodic intracellular conductivity (Fourier series). As a first application of the method, the response of a 50-cell, single interior fiber to a defibrillating current is examined under steady-state conditions. Transmembrane as well as intra- and extracellular potential distributions along the fiber were calculated.
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Trayanova et al. (1993) studied Cardiac tissue modeling. Extended bidomain model with periodic intracellular conductivity was evaluated on Transmembrane, intra- and extracellular potential distributions. An extended bidomain model using spectral techniques successfully calculated transmembrane and potential distributions along a 50-cell fiber in response to a defibrillating current.
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