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JACC:心室早搏相关性心肌病的病理生理研究

2018-12-15 MedSci MedSci原创

心室早搏(PVC)相关心肌病的病理生理机制尚不明确。本研究的目的旨在通过心律失常猪模型探究心肌病的发病机制。本研究对35例猪进行了起搏器的植入,其中一组于右心尖接受了长达14周的二联律起搏(RVA PVC; n = 10),一组于右心尖接受了规律140下/min的起搏刺激(RVA-140; n = 10),5例为对照。为了检测异位搏动不同步的作用,又进一步分组,一组与右室游离壁接受了长达12周的二

心室早搏(PVC)相关心肌病的病理生理机制尚不明确。本研究的目的旨在通过心律失常猪模型探究心肌病的发病机制。

本研究对35例猪进行了起搏器的植入,其中一组于右心尖接受了长达14周的二联律起搏(RVA PVC; n = 10),一组于右心尖接受了规律140下/min的起搏刺激(RVA-140; n = 10),5例为对照。为了检测异位搏动不同步的作用,又进一步分组,一组与右室游离壁接受了长达12周的二联律起搏(RVFW PVC; n = 5),一组于左室心外膜(LV Epi PVC; n = 5),一组于右心房(n=5)。14周后,RVA PVC组的左室射血分数明显低于RVA-140组和对照组(p < 0.05),左室射血分数降低幅度最大的是LV Epi PVC (65.2 ± 2.4% to 39.7 ± 3.0%; p < 0.01) 和RVFW PVC (66.1 ± 2.6% to 48.6 ± 2.7%; p < 0.01)。pRyR2, NCX-1, CaMKII-α和PLN蛋白水平在 LV Epi PVC组中明显增高,SERCA2a 蛋白水平明显下降(p < 0.05)。另外,异位搏动QRS持续时间越长和左室不同步程度越大与左室收缩功能下降越大呈相关性。

研究结果显示,在猪模型中,心室早搏引起的心肌病表现与心动过速引起的心肌病不一样,心肌病的严重程度与血流动力学紊乱程度呈相关性。

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    2019-11-13 hbwxf
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    2018-12-17 bioon7
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