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arXiv 2302.05281math.NAcs.NAq-bio.TO
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心脏电生理学逐细胞模型的边界积分公式

Boundary Integral Formulation of the Cell-by-Cell Model of Cardiac Electrophysiology

Giacomo Rosilho de Souza, Rolf Krause, Simone Pezzuto

AI总结:

提出一种基于边界积分公式的边界元方法,用于精确求解心脏电生理学逐细胞(EMI)模型,消除了系统退化性并显著减少了自由度,同时证明了其空间指数收敛性。

摘要:

我们提出了一种边界元方法,用于精确求解电生理学的逐细胞双域模型。逐细胞模型,也称为细胞外-膜-细胞内(EMI)模型,是一个反应扩散方程组,描述了每个域内电势的演化:细胞内、细胞外空间和细胞膜。该系统是抛物型的但退化,因为时间导数仅在膜域中。在本工作中,我们采用边界积分公式来消除系统中的退化性,并将其转化为膜上的抛物方程。该公式在数值上也有优势,因为与原始模型相比,自由度数量显著减少。具体而言,我们证明了EMI模型的边界元离散化等价于一个常微分方程组,并考虑了基于多速率显式稳定Runge-Kutta方法的时间离散化。我们在数值上证明了我们的方案在单细胞情况下在空间上指数收敛。最后,我们提供了几个具有生物学意义的数值实验。

英文摘要:

We propose a boundary element method for the accurate solution of the cell-by-cell bidomain model of electrophysiology. The cell-by-cell model, also called Extracellular-Membrane-Intracellular (EMI) model, is a system of reaction-diffusion equations describing the evolution of the electric potential within each domain: intra- and extra-cellular space and the cellular membrane. The system is parabolic but degenerate because the time derivative is only in the membrane domain. In this work, we adopt a boundary-integral formulation for removing the degeneracy in the system and recast it to a parabolic equation on the membrane. The formulation is also numerically advantageous since the number of degrees of freedom is sensibly reduced compared to the original model. Specifically, we prove that the boundary-element discretization of the EMI model is equivalent to a system of ordinary differential equations, and we consider a time discretization based on the multirate explicit stabilized Runge-Kutta method. We numerically show that our scheme convergences exponentially in space for the single-cell case. We finally provide several numerical experiments of biological interest.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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