鼠标捆绑分支中的不连续传导是由捆绑-分支架构引起的
Toon A B van Veen1, Harold V M van Rijen, Marjan J A van Kempen
1Department of Medical Physiology, University Medical Center Utrecht, Utrecht, The Netherlands. A.A.B.vanVeen@med.uu.nl
Circulation
|October 6, 2005
概括
鼠标捆枝 (BBs) 中传导速度的降低是由于BB几何学的路径长度增加,而不是改变的电特性. 这一发现阐明了心脏中电信号传播减缓背后的机制. 关键词:捆绑分支传导速度,心脏电活动,心脏电生理学.
科学领域:
- 心脏电生理学 心脏电生理学
- 心血管解剖学 心血管解剖学
背景情况:
- 鼠标捆枝 (BBs) 的电气记录显示,与近端BB相比,中侧区域的传导速度 (CV) 较慢.
- 这种观察到的导电减速的潜在机制需要阐明.
研究的目的:
- 为了研究导致小鼠BB中部部分心血管功能减弱的机制.
- 为了将BB几何和连接素分布与CV特征相关联.
主要方法:
- 用247点电极阵列绘制隔离的,经兰登多夫浸透的小鼠心脏 (n=16).
- 使用过早刺激来评估传导速度的恢复.
- 分析了连接素表达 (Cx40,Cx43,Cx45) 和BB形态.
主要成果:
- 与近接BB相比,中部BB CV减少了50%,CV恢复情况类似.
- 连接素的表达有所变化,Cx43只存在于远端BB.
- 中部和远部BB表现出复杂的交织纤维网络,与近端BB的平行纤维形成鲜明对比.
结论:
- 由于复杂的光纤网络,BB几何学,特别是增加的路径长度,解释了中 septal 区域的 CV 减少.
- 亚细胞间隙连接分布的差异也可能有助于.
- 这些发现突出了结构因素在心脏电传导中的作用.
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