渐变模型对比的松耳节点的马赛克模型
H Zhang1, A V Holden, M R Boyett
1School of Biomedical Sciences, University of Leeds, Leeds, UK.
Circulation
|February 7, 2001
概括
鼻腔 (SA) 节点的马赛克模型没有得到计算分析的支持. 梯度模型更好地解释了SA节点内的电活动差异.
科学领域:
- 心脏电生理学心脏电生理学
- 计算生物学是一种计算生物学.
- 心血管研究的心血管研究.
背景情况:
- 讨论的是腔 (SA) 节点的区域电气差异.
- 马赛克模型提出了心房和SA节点细胞的混合.
- 梯度模型表明SA节点细胞的内在性质有所不同.
研究的目的:
- 为了计算评估SA节点马赛克模型.
- 为了比较马赛克和梯度模型的预测能力.
- 为了确定SA节点函数最准确的模型.
主要方法:
- 在2D网格中使用合普通微分方程网络 (CODE) 构建了一个计算马赛克模型.
- 格子节点被随机分配为心房或SA节点细胞.
- 模型预测与对电活动的实验观测进行了比较.
主要成果:
- 马赛克模型未能预测SA节点外围和中心之间的作用电位速率和形状观察到的差异.
- 梯度模型成功地预测了这些特征性的电差.
- 计算模拟有利于梯度模型而不是马赛克模型.
结论:
- 在SA节点的马赛克模型是不可持续的.
- 梯度模型充分描述了SA节点的功能和区域电气特性.
- 这些发现支持梯度模型对SA节点电生理学的解释.
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