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Atrial Anatomy Influences Onset and Termination of Atrial Fibrillation: A Computer Model Study

机译:心房解剖学影响房颤的发作和终止:计算机模型研究

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Vulnerability to atrial fibrillation (AF) is increased in acutely dilated atria and is related to stretch-activated channels (SACs). To investigate the role of atrial anatomy in AF, we apply a computer model of human atrial electromechanics that includes SACs and contraction of the sarcomeres. Trabecular bundle structures are modeled by varying atrial wall thickness in a triangular mesh representing the human atria. Vulnerability to AF is investigated by application of overall stretch, while stimulating near the pulmonary veins. Due to contraction of some areas, stretch increases in other areas, leading to a variation in effective refractory period (ERP). Onset and perpetuation of AF in our model is explained by an increased dispersion in ERP, conduction slowing, and local conduction block. Atrial contraction attributes to the termination of AF through mechanoelectric feedback. We conclude that onset and termination of AF episodes under stretch are related to atrial structure and mechanoelectric feedback.
机译:在急性扩张的心房中,房颤(AF)的脆弱性增加,并且与拉伸激活通道(SAC)有关。为了研究房颤在房颤中的作用,我们应用了包括心电图和肉瘤收缩在内的人房机电模型。通过改变代表人心房的三角形网眼的心房壁厚来模拟小梁束结构。通过在肺静脉附近刺激的同时进行总体拉伸研究对AF的脆弱性。由于某些区域的收缩,其他区域的拉伸增加,导致有效不应期(ERP)的变化。在我们的模型中,房颤的发作和永存是由ERP离散度增加,传导减慢和局部传导阻滞引起的。心房收缩归因于通过机械电反馈终止房颤。我们得出结论,拉伸下房颤发作的发作和终止与心房结构和机电反馈有关。

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