Generation and escape of local waves from the boundary of uncoupled cardiac tissue.

Biophysical Journal
V N BiktashevNarine Sarvazyan

Abstract

We aim to understand the formation of abnormal waves of activity from myocardial regions with diminished cell-to-cell coupling. En route to this goal, we studied the behavior of a heterogeneous myocyte network in which a sharp coupling gradient was placed under conditions of increasing network automaticity. Experiments were conducted in monolayers of neonatal rat cardiomyocytes using heptanol and isoproterenol as means of altering cell-to-cell coupling and automaticity, respectively. Experimental findings were explained and expanded using a modified Beeler-Reuter numerical model. The data suggest that the combination of a heterogeneous substrate, a gradient of coupling, and an increase in oscillatory activity of individual cells creates a rich set of behaviors associated with self-generated spiral waves and ectopic sources. Spiral waves feature a flattened shape and a pin-unpin drift type of tip motion. These intercellular waves are action-potential based and can be visualized with either voltage or calcium transient measurements. A source/load mismatch on the interface between the boundary and well-coupled layers can lock wavefronts emanating from both ectopic sources and rotating waves within the inner layers of the coupling ...Continue Reading

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Citations

Mar 4, 2008·American Journal of Physiology. Heart and Circulatory Physiology·Matthew KayNarine Sarvazyan
Jul 29, 2015·Tissue Engineering. Part a·Zaruhi KarabekianNarine Sarvazyan
May 6, 2009·Biophysical Journal·Nima Badie, Nenad Bursac
Jan 15, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·S SridharAlexander V Panfilov
Nov 14, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·B BezekciV N Biktashev

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