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Efficacy and mechanisms of biventricular and left/right direct cardiac compression in acute heart failure sheep.

机译:急性心力衰竭绵羊双心室和左/右直接心脏压迫的功效和机制。

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摘要

Direct cardiac compression (DCC) with implanted heart patches has previously demonstrated efficacy of biventricular (BiV) support in acute heart failure (HF) sheep. We hypothesized that this was primarily due to a left ventricular (LV) effect. This study compared BiV, LV, and right ventricular (RV) assists in terms of hemodynamic and energetic response. Ten sheep underwent instrumentation and device implantation at least 1 week prior to study. HF (50% reduction in cardiac output) was maintained with intravenous esmolol infusion. BiV, LV, and RV assists were activated randomly with intervening stable HF periods. BiV assist was more effective than either LV or RV assist in restoring hemodynamic parameters; however, there was no difference in efficacy of LV and RV support. RV assist preserved left coronary flow patterns and chamber geometry compared to other assist conditions, but increased LV preload. These results suggest that LV and RV support each make a significant contribution to the efficacy of BiVassist, albeit through different mechanisms.
机译:植入心脏补丁的直接心脏压缩(DCC)先前已证明双心室(BiV)支持在急性心力衰竭(HF)绵羊中的功效。我们假设这主要是由于左心室(LV)效应。这项研究比较了BiV,LV和右心室(RV)的血流动力学和精力充沛反应。在研究前至少1周,对10只绵羊进行了仪器和设备植入。静脉注射艾司洛尔可维持HF(心输出量减少50%)。 BiV,LV和RV辅助在干预稳定的HF期间随机激活。在恢复血液动力学参数方面,BiV辅助比LV或RV辅助更有效。但是,左室和右室支持的疗效没有差异。与其他辅助条件相比,RV辅助保留了左冠状动脉血流模式和腔室几何形状,但增加了LV预负荷。这些结果表明,尽管通过不同的机制,LV和RV的支持均对BiVassist的功效做出了重大贡献。

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