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A Model for the Propagation of Action Potentials in Non-Uniformly Excitable Media

โœ Scribed by A. Rabinovitch; I Aviram; N. Gulko; E. Ovsyshcher

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
202 KB
Volume
196
Category
Article
ISSN
0022-5193

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โœฆ Synopsis

Electrophysiological properties of cardiac tissue change as a function of position. We define the ''excitability'' as the propagation velocity of an excitation pulse through the tissue, and study a simple FitzHugh-Nagumo (FHN) model of heart tissue whose excitability changes with position. The propagation velocity is shown to be a good continuous measure of the excitability for both limit cycle and excitable tissues. The influence of the spatial dependence of the excitability is examined for several normal and pathological situations. A novel transient effect is observed for a train of pulses propagating across an excitability step.

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