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Mol Med Rep:缝隙连接抑制剂庚醇在不影响复极性能和不应期的情况下,通过减慢传导速度,增加室性心律失常

2018-03-04 李华宇 “罂粟花”微信号

第一次证明使用低浓度庚醇(0.05mM)可单独抑制缝隙连接从而降低CV,其单独使用足以通过减少λ而提前刺激导致VT的发生,且这在发生心律失常的倾向中具有重要决定作用。

背景与目的

本研究的目的是探讨在大鼠离体心脏灌注中缝隙连接抑制剂庚醇(0.05mM)的致心律失常效应。

方  法

右心室起搏时从左心室心外膜记录心肌单相动作电位。观察使用庚醇之前和之后12只心脏在8 Hz起搏期间的常规活动。

结  果

相比之下,庚醇处理后使用S1S2刺激方案(Fisher's精确检验; P <0.05)观察到有6只心脏诱发出室性心动过速(VT)。 庚醇的致心律失常作用与激活潜伏期从13.2±0.6增加到19.4±1.3ms(方差分析,P <0.001)和传导速度(CVs)从0.23±0.01降低到0.16±0.01ms(方差分析,P <0.001)相关,APDx = 90%(38.0±1.0 vs 38.3±1.8ms),70%(16.8±1.0 vs 19.5±0.9ms),50%(9.2±0.8 vs 10.1±0.6ms)或30%(4.8±0.5 vs 6.3±0.6ms)或有效不应期(ERPs)(39.6±1.9 vs 40.6±3.0ms)(P> 0.05)。 因此,兴奋波长(λ; CV x ERP)从9.1±0.6减少到6.5±0.6 mm(P <0.01),但再兴奋的临界间期(APD90 - ERP)差异无统计学意义(-1.1±2.4 vs -2.3±1.8ms; P> 0.05)。

结  论

据我们所知,该观察结果第一次证明使用低浓度庚醇(0.05mM)可单独抑制缝隙连接从而降低CV,其单独使用足以通过减少λ而提前刺激导致VT的发生,且这在发生心律失常的倾向中具有重要决定作用。

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    2018-10-29 jklm09
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    2018-03-04 wqkm

    ^_^^_^^_^

    0

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