Article ID Journal Published Year Pages File Type
767489 Communications in Nonlinear Science and Numerical Simulation 2009 8 Pages PDF
Abstract

An investigation of the nonlinear dynamics of a heart model is presented. The model compartmentalizes the heart into one part that beats autonomously (the x oscillator), representing the pacemaker or SA node, and a second part that beats only if excited by a signal originating outside itself (the y oscillator), representing typical cardiac tissue. Both oscillators are modeled by piecewise linear differential equations representing relaxation oscillators in which the fast time portion of the cycle is modeled by a jump. The model assumes that the x oscillator drives the y   oscillator with coupling constant αα. As αα decreases, the regular behavior of y oscillator deteriorates, and is found to go through a series of bifurcations. The irregular behavior is characterized as involving a large amplitude cycle followed by a number n   of small amplitude cycles. We compute critical bifurcation values of the coupling constant, αnαn, using both numerical methods as well as perturbations.

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Physical Sciences and Engineering Engineering Mechanical Engineering
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