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Scroll-Wave Dynamics in Human Cardiac Tissue: Lessons from a Mathematical Model with Inhomogeneities and Fiber Architecture

Figure 21

Scroll-wave dynamics in the 3D TNNP model with fiber rotation and a cylindrical ionic inhomogeneity with radius cm.

Spacetime pseudocolor plots of are shown in (a.1), (b.1), and (c.1) at the representative point , for three positions of the obstacle when . (a.1) shows the plot for the obstacle at the center of the simulation domain; (b.1) shows the same for the case where the obstacle is at a corner away from the core of the scroll; and (c.1) shows the same for the case where the obstacle is at a corner that is close to the scroll-wave core. There is no indication of spatiotemporal chaos as can be seen from these illustrative space-time plots. Power spectra obtained from the time series recorded from the representative point for these three cases are illustrated in (a.2), (b.2), and (c.2); the peaks in these power spectra can be indexed as , with and two incommensurate frequencies, so the temporal evolution of the scroll wave, away from the ionic inhomogeneity, is quasi-periodic.

Figure 21