Modelling electrical activity from cell to body surface

Presents a modelling framework in which the interaction of the passive external tissue with the extracellular potentials of the myocardium can be studied. The procedure involves iterating between solutions of the bidomain equations, valid in the myocardium, and Laplace's equation, valid in the passive tissue, until continuity of potential and current flow has been achieved across the heart's surfaces. Initial simulations on a two-dimensional cross section of a human torso shows that the iterative process readily converges.