SPIRAL FORMATION IN A BELOUSOV-ZHABOTINSKY MEDIUM BY PREMATURE RE-EXCITATION: VULNERABILITY

Autor:	Vicente Pérez-Muñuzuri, V.I. Krinsky, Vicente Pérez-Villar, G. Fernández-García, Alberto P. Muñuzuri, C.F. Starmer, Moncho Gómez-Gesteira
Rok vydání:	1994
Předmět:	Physics Applied Mathematics Isotropy Test stimulus Mechanics Stimulus (physiology) Critical value Heart Rhythm Modeling and Simulation Cardiac structure Spatial extent Engineering (miscellaneous) Excitation Simulation
Zdroj:	International Journal of Bifurcation and Chaos. :1193-1204
ISSN:	1793-6551 0218-1274
DOI:	10.1142/s0218127494000897
Popis:	Spiral waves can be initiated in cardiac tissue by first stimulating it with a conditioning stimulus and then by a test stimulus at a different site. Because the resulting heart rhythm can be life threatening, this behaviour has been widely treated and the interval of time between conditioning and test stimuli has been labelled vulnerability. We hypothesize that the anisotropic cardiac structure was not essential for spiral initiation and reproduced it in a Belousov-Zhabotinsky (BZ) medium, which is continuous and characterized by isotropic diffusion coefficients. We observe that the different spatial extent of the medium (systems “quasi” 1D, 2D or 3D) influences the evolution of the test wave front. Even when the spatial extent of the third dimension exceeds a critical value, the region of vulnerability can disappear.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::662a12f1c4f4e825c2b47b62dec2cb96 https://doi.org/10.1142/s0218127494000897 Zobrazit plný text záznamu