心肌不连续性:用于生产虚拟电极的基板,这些电极通过冲击直接激发心肌
J B White1, G P Walcott, A E Pollard
1Department of Medicine, University of Alabama at Birmingham, USA.
Circulation
|May 20, 1998
概括
人工心肌不连续性在刺激时会产生激活前线,表明极化区域在边界形成. 这一发现支持了电刺激对心脏组织影响的理论模型.
科学领域:
- 心血管生理学心血管生理学
- 心脏电生理学 心脏电生理学
背景情况:
- 理论模型提出,电刺激在心肌不连续性周围产生极化区域 (去极化/超极化).
- 这项研究实验性地研究了这些极化区域的存在,使用人工断续.
研究的目的:
- 为了确定人工心肌断裂是否会在电刺激时产生激活前线.
- 为了验证这个激活前线是否与理论上的极化区域一致.
主要方法:
- 在六只狗中,通过穿刺切口创建了心肌断裂.
- 在切口前后使用504个电极的斑块进行了心上激活映射.
- 应用了具有不同S2刺激强度和极性的刺激协议.
主要成果:
- 在切口前,刺激只在电极附近直接激活组织,激活前线在边界形成.
- 切口后,刺激激活了与不连续性相邻的组织,强度较低 (45%的阴极,39%的阳极).
- 激活前线起源于不连续性,并向刺激部位或远离刺激部位传播.
结论:
- 心肌不连续性可以在电刺激后诱导激活前线.
- 实验结果支持对心肌不连续性相邻的极化区域的假设.
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