Why the study?
Abnormalities in cardiomyocyte action potentials cause arrhythmia and potentially sudden death, making mathematical model studies important to investigate mechanisms of arrhythmogenesis.
This mathematical modeling study elucidates the bifurcation mechanisms underlying the transition from normal action potentials to early afterdepolarizations by altering L-type calcium channel conductance.
Cardiac model results on afterdepolarizations flag arrhythmia risks; leaves open clinical validation.
Electrical activity occurs in the cell membrane of cardiomyocytes. This electrical activity forms the action potential that generates pumping of the heart. An abnormality in the action potential turns into arrhythmia, which may cause sudden death. Studies of arrhythmias using mathematical models are important to reduce the risk of sudden death. In this study, we investigate bifurcations related to the generation of early afterdepolarizations (EADs) in a mathematical model. We clarify the transition process from a normal state to a persistent EAD through a transient EAD while changing only one parameter (multiple of conductance of L-type calcium channel current) value. The dependence of the transient EAD generation on parameters is shown through bifurcation analysis in a [Na]i-parameterized system.
No takes yet. Share an insight, caveat, or question.
Kitajima et al. (2021) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: