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Vulnerability for reentry in a three dimensional model of human atria: a simulation study

机译:人体心房三维模型中的折返漏洞:模拟研究

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Atrial tachycardias are the most common cardiac arrhythmias in clinical practice, which induce changes in atrial properties that help to perpetuate them. These changes are called “atrial remodeling”. Recent studies have shown that rapid ectopic activity principally on the pulmonary veins can trigger reentrant mechanisms and lead to atrial tachycardias. However, the influences of ectopic foci location, the number of ectopic beats and its frequency on the likelihood of triggering reentries are not well known. In this work the effects of electrical remodeling were incorporated in an atrial cell model and integrated in a three-dimensional model of human atria, to develop a study of vulnerability for reentries. To carry out the study, an ectopic beat and a burst of six ectopic beats at two different frequencies were applied in six different locations in the atria. The results show greater vulnerability in the left pulmonary veins when we applied a single ectopic beat. When we increase the number of ectopic beats to six, a greater width of the vulnerable window was observed when ectopic focus frequency was high. The location, the number of ectopic beats and their frequency affect the vulnerability for reentry.
机译:房性心动过速是临床实践中最常见的心律不齐,可引起房性变化,从而使房性永久性心律失常。这些变化称为“心房重构”。最近的研究表明,主要在肺静脉上的快速异位活动可触发折返机制并导致房性心动过速。但是,异位灶的位置,异位搏动的数量及其频率对触发再入的可能性的影响尚不清楚。在这项工作中,电重构的作用被整合到心房模型中,并整合到人心房的三维模型中,以研究折返的脆弱性。为了进行这项研究,在心房的六个不同位置应用了异位搏动和两个不同频率的六个异位搏动。结果显示,当我们应用单个异位搏动时,左肺静脉中的脆弱性更大。当我们将异位搏动的数量增加到六个时,当异位聚焦频率很高时,观察到更大的脆弱窗口宽度。位置,异位搏动的数量及其频率会影响重新进入的脆弱性。

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