Why the study?
Although sodium channels form clusters in perinexi near gap junction plaques, the electrophysiological role and relevance of these perinexal clusters were unknown.
Population
3D finite element model of two longitudinally abutting cardiomyocytes
Comparison
Na+ channel cluster located in the perinexus vs remotely from the gap junction plaque
Design
Computational simulation study using a 3D finite element model
Key result
In a 3D finite element model, localization of Na+ channel clusters in narrowed perinexi of gap junction plaques facilitated cardiac impulse transmission via ephaptic coupling.
Authors
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Model supports perinexi-enabled ephaptic coupling when gap junctions weaken; hypothesis-generating, needs in vivo confirmation before clinical consideration.
A 3D computational model demonstrates that Na+ channel clusters in narrowed perinexi of gap junctions facilitate cardiac impulse transmission via ephaptic coupling, especially when gap junctional coupling is reduced.
Ivanovic et al. (2021) studied Cardiac impulse transmission. Localization of Na+ channel clusters in narrowed perinexi vs. Na+ channel cluster located remotely from the gap junction plaque was evaluated on Impulse transmission via ephaptic coupling. In a 3D finite element model, localization of Na+ channel clusters in narrowed perinexi of gap junction plaques facilitated cardiac impulse transmission via ephaptic coupling.
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