首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Influence of Hypoxic and Hyperoxic Preconditioning on Endothelial Function in a Model of Myocardial Ischemia-Reperfusion Injury with Cardiopulmonary Bypass (Experimental Study)
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Influence of Hypoxic and Hyperoxic Preconditioning on Endothelial Function in a Model of Myocardial Ischemia-Reperfusion Injury with Cardiopulmonary Bypass (Experimental Study)

机译:缺氧和高氧化预处理对心肺旁路(实验研究)心肌缺血再灌注损伤模型内皮功能的影响(实验研究)

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摘要

The aim of the experiment was to evaluate the effect of preconditioning based on changes in inspiratory oxygen fraction on endothelial function in the model of ischemia-reperfusion injury of the myocardium in the condition of cardiopulmonary bypass. The prospective randomized study included 32 rabbits divided into four groups: hypoxic preconditioning, hyperoxic preconditioning, hypoxic-hyperoxic preconditioning, and control group. All animals were anesthetized and mechanically ventilated. We provided preconditioning, then started cardiopulmonary bypass, followed by induced acute myocardial infarction (ischemia 45 min, reperfusion 120 min). We investigated endothelin-1, nitric oxide metabolites, asymmetric dimethylarginine during cardiopulmonary bypass: before ischemia, after ischemia, and after reperfusion. We performed light microscopy of myocardium, kidney, lungs, and gut mucosa. The endothelin-1 level was much higher in the control group than in all preconditioning groups after ischemia. The endothelin-1 even further increased after reperfusion. The total concentration of nitric oxide metabolites was significantly higher after all types of preconditioning compared with the control group. The light microscopy of the myocardium and other organs revealed a diminished damage extent in the hypoxic-hyperoxic preconditioning group as compared to the control group. Hypoxic-hyperoxic preconditioning helps to maintain the balance of nitric oxide metabolites, reduces endothelin-1 hyperproduction, and enforces organ protection.
机译:实验的目的是评估前提条件基于对心肌旁路缺血再灌注损伤模型对内皮函数对内皮功能的影响。前瞻性随机研究包括32只兔子分为四组:缺氧预处理,过杀预处理,缺氧预防预处理和对照组。所有动物都被麻醉和机械通风。我们提供预处理,然后开始心肺心肺旁路,然后诱导急性心肌梗死(缺血45分钟,再灌注120分钟)。我们研究了内皮素-1,一氧化氮代谢物,心肺期间的不对称二甲基碱:在缺血,缺血后和再灌注后。我们对心肌,肾,肺和肠粘膜进行了光学显微镜。对照组内皮素-1水平高于所有预处理基团在缺血后的含量高得多。再灌注后内皮素-1甚至进一步增加。与对照组相比,所有类型的预处理后,一氧化氮代谢物的总浓度明显高。与对照组相比,心肌和其他器官的光学显微镜显微镜揭示了缺氧预处理组中的减少程度。缺氧 - 超氧的预处理有助于保持一氧化氮代谢物的平衡,降低内皮素-1大量生产,并实施器官保护。

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