A two-variable model robust to pacemaker behaviour for the dynamics of the cardiac action potential.

A two-variable model robust to pacemaker behaviour for the dynamics of the cardiac action potential.
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DOI:
10.1016/j.mbs.2016.08.010
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发表时间:
2016-11
影响因子:
4.3
通讯作者:
Niederer SA
Niederer SA
中科院分区:
生物学4区
文献类型:
--
作者:
Corrado C;Niederer SA

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简化心肌细胞电生理模型优化的病人特定的建模。修正Mitchell和Schaeffer模型。没有虚假的起搏器行为。适用于参数拟合。一致的领先顺序APD近似。具有两个状态变量的离子模型通常用于患者特定的电生理模拟,因为要约束的参数数量少,而且它们的计算易于处理。在这些模型中,Mitchell and Schaeffer (MS)动作电位模型由于能够再现动作电位的形状和恢复特性,在脑室电生理中经常被使用。然而,对于表征这种离子模型的一些参数的选择,存在不必要的起搏器行为。缺乏排除不稳定参数组合的先验准则会影响参数拟合算法,因为非生理解只能在后验中被丢弃。在本文中,我们提出了一种MS模型的适应性,该模型对任何参数组合都不会表现出起搏器行为。该模型对起搏器行为的鲁棒性使其适合于逆问题的应用。
Simplified cardiomyocyte electrophysiology model optimised for patient specific modelling. Modified Mitchell and Schaeffer model. No spurious pacemaker behaviour. Suitable for parameter fitting. Consistent leading order APD approximation. Ionic models with two state variables are routinely used in patient specific electro-physiology simulations due to the small number of parameters to be constrained and their computational tractability. Among these models, the Mitchell and Schaeffer (MS) action potential model is often used in ventricle electro-physiology due to its ability to reproduce the shape of the action potential and its restitution properties. However, for some choices of parameters characterising this ionic model, unwanted pacemaker behaviour is present. The absence of any a priori criterion to exclude unstable parameter combinations affects parameter fitting algorithms, as unphysiological solutions can only be discarded a posteriori. In this paper we propose an adaptation of the MS model that does not exhibit pacemaker behaviour for any combination of the parameters. The robustness to pacemaker behaviour makes this model suitable for inverse problem applications.
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