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Towards Detailed Tissue-Scale 3D Simulations of Electrical Activity and Calcium Handling in the Human Cardiac Ventricle

机译:走向人体心脏电活动和钙处理的详细组织规模3D模拟

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We adopt a detailed human cardiac cell model, which has 10000 calcium release units, in connection with simulating the electrical activity and calcium handling at the tissue scale. This is a computationally intensive problem requiring a combination of efficient numerical algorithms and parallel programming. To this end, we use a method that is based on binomial distributions to collectively study the stochastic state transitions of the 100 ryanodine receptors inside every calcium release unit, instead of individually following each ryanodine receptor. Moreover, the implementation of the parallel simulator has incorporated optimizations in form of code vectorization and removing redundant calculations. Numerical experiments show very good parallel performance of the 3D simulator and demonstrate that various physiological behaviors are correctly reproduced. This work thus paves way for high-fidelity 3D simulations of human ventricular tissues, with the ultimate goal of understanding the mechanisms of arrhythmia.
机译:我们采用详细的人体心脏细胞模型,该模型具有10000个钙释放单元,可以模拟组织规模的电活动和钙处理。这是一个计算量很大的问题,需要结合有效的数值算法和并行编程。为此,我们使用基于二项式分布的方法来集体研究每个钙释放单元内100个ryanodine受体的随机状态转变,而不是单独跟随每个ryanodine受体。此外,并行模拟器的实现已以代码矢量化的形式并入了优化,并删除了多余的计算。数值实验表明3D模拟器具有非常好的并行性能,并证明正确再现了各种生理行为。因此,这项工作为人类心室组织的高保真3D模拟铺平了道路,最终目的是了解心律不齐的机制。

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