The utility of an amorphous model in computer simulation of myocardial propagation

Previously carried out simulation of myocardial exciting propagation used lattice structure models composed of square units or hexagonal units. These models were planar, and problematic in that the front of the excitement-propagating waveform became polygonal rather than circular. This problem cannot be resolved even by increased unit numbers. To solve this problem, the authors created an amorphous model. Nearly circular exciting wavefronts were successfully obtained in this amorphous model. In addition, when multiple (3) stimuli were applied to the two types of model simultaneously, in lattice-structured models, continued shifting of the three stimuli locations by 90 degrees provoked noticeable differences in the residual form of exciting waves, but in the amorphous model no such illogical phenomena were noted. Furthermore, when an area with an abnormal excitement propagation was established in a region of the models, simulated propagation brought about a different outcome between the lattice model and the amorphous model. A reentry mechanism could be shown in the amorphous model, but not on the previous lattice model. Further trials are continuing. Based on the foregoing information, the authors have confirmed the utility of an amorphous model.