Superexcitability induced spiral breakup in excitable systems

Year: 1996

Authors: Giaquinta A., Boccaletti S., Arecchi F.T.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: We introduce a 2D coupled map lattice model which, besides simulating the two variable FitzHugh-Nagumo reaction diffusion mechanism, accounts also for a superexcitable period. Superexcitability in the threshold dynamics of excitable media has been recently observed in experiments on cardiac tissues. By this model, we can reproduce the transition from normal cardiac behavior toward fibrillating processes in a 2D assembly of cardiac cells. The role of superexcitability results in producing two states of wave propagation and a spiral breakup mechanism in qualitative agreement with the experimental evidence of coarse and fine fibrillation in human hearts.

Journal/Review: INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS

Volume: 6 (9)      Pages from: 1753  to: 1759

KeyWords: CARDIAC TISSUE; DYNAMICS; MODEL; PROPAGATION; ACTIVATION
DOI: 10.1142/S0218127496001089

Citations: 7
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