Key result
Reducing gate variables in 2D cardiac models induces dynamic instability by accelerating wave propagation.
Why the study?
Spiral wave dynamics in cardiac tissue are critically implicated in the pathogenesis of arrhythmias, but the ionic mechanisms modulating their stability require investigation.
Modulating calcium and potassium currents and reducing gate variables in a computational cardiac model induces dynamic instability and spiral wave breakup, providing theoretical insights into arrhythmogenesis.
Answers are grounded in this paper and cite their sources.
Suggests ionic modulation promotes instability in models; leaves open relevance to clinical arrhythmogenesis.
Spiral wave dynamics in cardiac tissue are critically implicated in the pathogenesis of arrhythmias. This study investigates the effects of modulating calcium and potassium currents on spiral wave stability in a two-dimensional cardiac model. The gate variable that dynamically regulates the opening probability of ion channels also plays a significant role in the control of the spiral wave dynamics. We demonstrate that reducing gate variables accelerates wave propagation, thins spiral arms, and shortens action potential duration, ultimately inducing dynamic instability. Irregular electrocardiogram (ECG) patterns and altered action potential morphology further suggest an enhanced arrhythmogenic potential. These findings elucidate the ionic mechanisms underlying spiral wave breakup, providing both theoretical insights and practical implications for the development of targeted arrhythmia treatments.
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Yuan et al. (2025) studied Arrhythmias. Modulating calcium and potassium currents was evaluated on Spiral wave stability. Reducing gate variables in a two-dimensional cardiac model accelerates wave propagation, thins spiral arms, and shortens action potential duration, ultimately inducing dynamic instability.
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