Key result
Adding ephaptic coupling enables rapid conduction and small discordant alternans domains in cardiac models.
Why the study?
Standard gap junction-based cardiac models cannot simultaneously reproduce the small discordant alternans domain sizes and rapid action potential propagation speeds observed experimentally.
This computational study demonstrates that ephaptic coupling is a critical mechanism for reproducing realistic cardiac conduction velocities and repolarization gradients.
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Supports ephaptic coupling in cardiac models; leaves open its role in human arrhythmias pending experimental validation.
Otani et al. (2023) studied Discordant alternans and ventricular fibrillation. Ephaptic coupling computational model vs. Standard gap-junction coupling computational model was evaluated on Discordant alternans domain size and action potential propagation speed. Incorporating ephaptic coupling in a computational model of cardiac cells allowed for the simultaneous reproduction of rapid action potential propagation speeds and small discordant alternans domain sizes.
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