在体体外膜肺氧合辅助再循环对猪心脏死亡后肝脏的保护作用

Repair function of extracorporeal membrane oxygenation recirculation in vivo for swine liver after cardiac death

目的 探讨在体体外膜肺氧合（ECMO）对猪心脏死亡30min后肝脏的保护作用.方法 长白猪10头,体质量为30～40 kg,随机分为实验组和对照组,麻醉后使用气管夹闭法使心脏停跳30 min,建立心脏死亡热缺血模型.实验组经右侧髂动、静脉置入动、静脉插管,连接ECMO体外循环管道;经左侧髂动脉,置入球囊导管至膈肌平面;启动ECMO建立再循环,灌注腹腔器官;同时调节循环酸碱度及电解质平衡.监测并记录循环流量、腹腔器官灌注压、静脉血液气体、电解质、转氨酶、胆汁量等指标.对照组热缺血30 min后原位冷灌注,UW液中冷储存肝脏.肝脏组织切片HE染色,观察其病理改变.结果 热缺血30 min后,肝脏呈现明显的乌黑淤血外观,病理切片显示肝窦扩张,血细胞淤滞,红细胞聚集.循环血液血液气体分析显示严重酸中毒.启动ECMO再循环后,循环流量能够维持在1 L/min,肝脏逐渐恢复鲜红色,病理切片显示肝窦扩张消失,淤滞的血细胞被驱散.经历30 min心脏停跳热缺血后,循环中天冬氨酸转氨酶明显升高至（226.0±28.0）U/L,应用ECMO 4 h后下降至（150.0±30.0）U/L.平均胆汁分泌量为7.75 ml/h.结论 ECMO再循环对心脏停跳30 min的猪肝脏具有保护作用.

Objective To investigate the repair function of extracorporeal membrane oxygenation （ECMO） in vivo for the liver after cardiac death with warm ischemia injury for 30 min from cardiac death swinc.Method Ten landraces,30 to 40 kg,randomized to experimental group and control group,were used to make 30-min cardiac death models through clamping trachea after deep anesthesia.An intravenous cannula was placed through right iliac arteries and veins,and connected to ECMO extracorporeal circulation pipes in experimental group.The balloon catheter was placed to diaphragm plane through left femoral artery.The ECMO was performed to infuse abdominal organs,and pH and electrolyte were adjusted.The circulation flow rate,intraperitoneal organ perfusion pressure,venous blood gas,electrolyte,transaminase,and bile product,etc.were monitored and recorded.The livers of control group were retrieved after 30-min cardiac arrest and stored in cold UW for 4 h.Pathological tissue was sliced and stained by HE.Result After 30-min cardiac arrest,the liver showed obvious congestion appearance; pathologically,there were hepatic sinus expansion,blood cells clog,and erythrocyte aggregation.Circulating blood gas analysis revealed severe acidosis.After the ECMO recirculation started,circulation flow rate maintained to 1 L/min,the liver gradually restored bright red,pathological biopsy showed that hepatic sinus expansion disappeared,and clogged blood cells dispelled.AST was markedly increased to （226.0 ± 28.0） U/L after 30-min cardiac arrest and reduced to （150.0 ± 30.0） U/L 4 h after the ECMO recirculation.Average bile production was 7.75 ml/h.Conclusion ECMO recirculation in vivo can repair the injured livers from cardiac death donor with 30-min cardiac arrest.