JACC:左室负荷降低可减少房性心律失常发生率

2018-08-13 MedSci MedSci原创

左心房(LA)的生理机能是受到左心室(LV)的功能和负荷影响的。本研究的目的旨在评估亚急性心梗状态下LV负荷的快速变化对LA生理机能的影响。本研究对19只实验猪进行了心梗建模,心梗后1-2周,通过经皮LV辅助装置(Impella)对14只猪进行了急性左室负荷的降低,剩余的5只猪通过经皮诱导主动脉反流引起急性左室负荷增高,通过压力负荷导管对LA进行实时的监测,并检测LA尼克酰胺腺嘌呤二核苷酸磷酸氧化

左心房(LA)的生理机能是受到左心室(LV)的功能和负荷影响的。本研究的目的旨在评估亚急性心梗状态下LV负荷的快速变化对LA生理机能的影响。

本研究对19只实验猪进行了心梗建模,心梗后1-2周,通过经皮LV辅助装置(Impella)对14只猪进行了急性左室负荷的降低,剩余的5只猪通过经皮诱导主动脉反流引起急性左室负荷增高,通过压力负荷导管对LA进行实时的监测,并检测LA尼克酰胺腺嘌呤二核苷酸磷酸氧化酶(NOX)和碱受体的磷酸化水平,以评估氧化应激水平。分析结果显示,急性左室负荷的降低可以减少左室舒张末期的压力,从而降低LA的平均压力和最大容积。在急性左室负荷降低之前,有71%的猪可诱导为心律不齐,而左室负荷的降低使这一比例减少为29%(p=0.02)。相反,增加左室负荷可以增加LA的压力,但不影响心房的心律。分子水平结果显示心梗后NOX2的表达水平升高,急性左室负荷降低可以减少NOX2表达水平。

研究结果显示,在亚急性心梗状态下,急性左室负荷降低可以缓解左房的伸张性,减少心房心律失常的发生率。

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    2019-03-26 hbwxf
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