肺动脉灌注低温肺保护液抑制肺组织细胞凋亡的研究

目的探讨体外循环（cardiopulmonary bypass,CPB）期间肺动脉灌注低温肺保护液对肺组织细胞凋亡的影响。方法将20例风湿性二尖瓣病变患者随机分为肺保护组和对照组,每组10例。2组患者均在CPB下行单纯二尖瓣人工机械瓣置换术。肺保护组CPB期间经肺动脉灌注低温肺保护液,对照组CPB期间经肺动脉灌注等量生理盐水。监测2组患者CPB术后0、6、122、4 h呼吸功能,取动脉血1 mL进行血气分析,计算氧合指数。同时于CPB术前及停止CPB术后分别取2组患者右下肺组织（1.0 cm×1.0 cm×1.0 cm）活检标本,原位DNA末端标记法（TUNEL法）检测肺组织细胞凋亡情况。结果肺保护组CPB术后0、6、12、24 h氧合指数均高于对照组（P〈0.01或P〈0.05）。2组CPB术后肺组织细胞凋亡率均较CPB术前明显增多（P均〈0.01）。肺保护组、对照组CPB术后肺组织细胞凋亡率分别为（10.46±1.96）%、（18.68±1.34）%,2组比较差异有统计学意义（P〈0.01）。结论（1）常规低温CPB术可以诱导肺组织细胞的细胞凋亡。（2）CPB期间经肺动脉灌注低温肺保护液可显著抑制肺组织细胞的凋亡,减轻CPB肺损伤,提示其具有肺保护作用。

Research of Pulmonary Artery Perfusion with Hypothermic Lung-protective Solution Inhibits Apoptosis in Lung Tissue Cell

Objective To explore effects of pulmonary artery perfusion with hypothermic lung-protective solution on the apoptosis of lung tissue cells during cardiopulmonary bypass(CPB).Methods Twenty cases undergoing mitral valve replacement(MVR) were randomly divided into lung protective group and control group with 10 cases in each group.The patients were replaced mechanical mitral valve under CPB.Hypothermic lung-protective solution was infused to the main pulmonary artery in the lung protective group,and sodium ch...