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3D parallel computer simulations of cardiac electrical propagation with sub-cellular resolution

Computer modeling provides a tool to assess the contribution of sub-cellular structure and physiology to normal and pathological cardiac conduction. Previous simulations have been too computationally demanding to model macroscopic tissue sections while retaining the sub-cellular resolution of interest. A new method for numerical simulations of cardiac electrical activity was developed which allows larger and more complex models to be examined. Sub-cellular resolution and physiology is incorporated into the cable model of cardiac tissue, which assumes a network of passive resistances linking ionic and capacitive membrane elements. This method adapts the model for three dimensional (3D) simulations in high performance parallel or vector computing environments. The authors' data demonstrates the numerical convergence of the technique, and validation with experiment and previous computer models.