Nonlinear Sciences – Adaptation and Self-Organizing Systems
Scientific paper
2008-03-18
Nonlinear Sciences
Adaptation and Self-Organizing Systems
27 pages, 10 figures, 61 references; A version of this paper (same results) is to appear in the Journal of Theoretical Biology
Scientific paper
A two-component model is developed that consists of a discrete loop of cardiac cells that circulates action potentials together with a cardiac pacing mechanism. Physiological properties of cells such as restitutions of refractoriness and of conduction velocity are given via experimentally measured functions. The dynamics of circulating pulses and their interactions with the pacer are regulated by two threshold relations. Patterns of spontaneous initiations and terminations of reentry (SITR) generated by this system are studied through numerical simulations and analytical observations. These patterns can be regular or irregular; causes of irregularities are identified as the threshold bistability of reentrant circulation (T-bistability) and in some cases, also phase-resetting interactions with the pacer.
Baumgarten C. M.
Cain John W.
Chan D. M.
Cheng Charles C. K.
Sedaghat Hassan
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