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Local heterogeneities in cardiac systems suppress turbulence by generating multi-armed rotors

Title: Local heterogeneities in cardiac systems suppress turbulence by generating multi-armed rotors.
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Name(s): Zhang, Zhihui, author
Steinbock, Oliver, author
Type of Resource: text
Genre: Text
Date Issued: 2016-05-12
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Ventricular fibrillation is an extremely dangerous cardiac arrhythmia that is linked to rotating waves of electric activity and chaotically moving vortex lines. These filaments can pin to insulating, cylindrical heterogeneities which swiftly become the new rotation backbone of the local wave field. For thin cylinders, the stabilized rotation is sufficiently fast to repel the free segments of the turbulent filament tangle and annihilate them at the system boundaries. The resulting global wave pattern is periodic and highly ordered. Our cardiac simulations show that also thicker cylinders can establish analogous forms of tachycardia. This process occurs through the spontaneous formation of pinned multi-armed vortices. The observed number of wave arms N depends on the cylinder radius and is associated to stability windows that for N = 2, 3 partially overlap. For N =. 1, 2, we find a small gap in which the turbulence is removed but the pinned rotor shows complex temporal dynamics. The relevance of our findings to human cardiology are discussed in the context of vortex pinning to more complex-shaped anatomical features and remodeled myocardium.
Identifier: FSU_libsubv1_wos_000377191300001 (IID), 10.1088/1367-2630/18/5/053018 (DOI)
Keywords: cardiac arrhythmia, cardiac dynamics, Dynamics, excitable media, excitation, fiber rotation, model, numerical simulation, pattern formation, reaction-diffusion, scroll waves, spiral waves, tachycardia, transition, ventricular fibrillation, ventricular-fibrillation
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1088/1367-2630/18/5/053018
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000377191300001
Owner Institution: FSU
Is Part Of: New Journal of Physics.
1367-2630
Issue: vol. 18

Choose the citation style.
Zhang, Z., & Steinbock, O. (2016). Local heterogeneities in cardiac systems suppress turbulence by generating multi-armed rotors. New Journal Of Physics. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000377191300001