Wave-train induced unpinning of weakly anchored vortices in excitable media

Details Wave-train induced unpinning of weakly anchored vortices in excitable media Wave-train induced unpinning of weakly anchored vortices in excitable media

2009-02-23

arxiv.org/abs/0902.3891v2

Phys. Rev. E 81, 010901(R) (2010)

Physics

Biological Physics

Published version

Scientific paper

10.1103/PhysRevE.81.010901

A free vortex in excitable media can be displaced and removed by a wave-train. However, simple physical arguments suggest that vortices anchored to large inexcitable obstacles cannot be removed similarly. We show that unpinning of vortices attached to obstacles smaller than the core radius of the free vortex is possible through pacing. The wave-train frequency necessary for unpinning increases with the obstacle size and we present a geometric explanation of this dependence. Our model-independent results suggest that decreasing excitability of the medium can facilitate pacing-induced removal of vortices in cardiac tissue.

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