首页> 外文期刊>Progress in Biophysics and Molecular Biology: An International Review Journal >Propagation of normal beats and re-entry in a computational model of ventricular cardiac tissue with regional differences in action potential shape and duration
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Propagation of normal beats and re-entry in a computational model of ventricular cardiac tissue with regional differences in action potential shape and duration

机译:正常搏动的传播和再进入在具有动作电位形状和持续时间区域差异的心室心脏组织计算模型中

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摘要

There is substantial experimental evidence from studies using both intact tissue and isolated single cells to support the existence of different cell types within the ventricular wall of the heart, each possessing different electrical properties. However other studies have failed to find these differences, and instead support the idea that electrical coupling in vivo between regions with different cell types smoothes out differences in action potential shape and duration. In this study we have used a computational model of electrical activation in heterogenous 2D and 3D cardiac tissue to investigate the propagation of both normal beats and arrhythmias. We used the Luo-Rudy dynamic model for guinea pig ventricular cells, with simplified Ca2+ handling and transmural heterogeneity in I-Ks and I-to. With normal cell-to-cell coupling, a layer of M cells was not necessary for the formation of an upright T wave in the simulated electrocardiogram, and the amplitude and configuration of the T wave was not greatly affected by the thickness and configuration of the M cell layer. Transmural gradients in repolarisation pushed re-entrant waves with an intramural filament towards either the base or the apex of the ventricles, and caused transient break up of re-entry with a transmural filament.
机译:来自研究的大量实验证据使用完整的组织和分离的单个细胞来支持心脏心室壁内不同细胞类型的存在,每种细胞具有不同的电特性。然而,其他研究未能找到这些差异,而是支持这样的想法,即具有不同细胞类型的区域之间的体内电耦合可以消除动作电位形状和持续时间的差异。在这项研究中,我们使用了异质2D和3D心脏组织中电激活的计算模型来研究正常搏动和心律不齐的传播。我们将Luo-Rudy动态模型用于豚鼠心室细胞,简化了Ca2 +处理,并在I-Ks和I-to中实现了透壁异质性。通过正常的细胞间耦合,在模拟心电图中不需要M层细胞即可形成直立的T波,并且T波的幅度和构型不会受到心电图厚度和构型的很大影响。 M细胞层。复极中的透壁梯度将带有壁内细丝的折返波推向心室的基部或心尖,并导致跨壁细丝的折返短暂分裂。

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