乌司他丁对体外循环肺损伤的保护作用

目的：研究乌司他丁对体外循环肺损伤的保护作用并探讨其机制。方法：风湿性心脏病患者30例，随机分成2组，乌司他丁组（U组，n=15）给予乌司他丁2×104U/kg,于切皮后至CPB前缓慢静注半量，另半量加入预充液中随转机进入体内；对照组（C组，n=15）用等量生理盐水代替。术后2h行支气管肺泡灌洗，分别测定支气管肺泡灌洗液（BALF）中中性粒细胞弹性蛋白酶(PMNE)，肿瘤坏死因子-α（TNF-α）和丙二醛（MDA）含量以及术前、CPB后1，4h肺氧合指数。结果：乌司他丁组BALF中PMNE，TNF-α和MDA含量较对照组明显降低(P<0.05)，术后肺氧合指数较对照组显著降低(P<0.05)，2组CPB后1，4h肺氧合指数均较同组术前显著增高(P<0.05)。结论：乌司他丁可能通过抑制PMNE，减轻肺部炎症反应，清除氧自由基等，对体外循环所致肺损伤提供保护作用。

Protective effects of ulinastatin on the lung injuryduring cardiopulmonary bypass

OBJECTIVE: To determine the protective effects and mechanism of ulinastatin on the lung injury during cardiopulmonary bypass (CPB). METHODS: Thirty patients with rheumatic heart disease (RHD) were divided into 2 groups randomly. The ulinastatin group (Group U, n = 15) received 1 x 10(4)U/kg ulinastatin intravenously before the CPB and the same amount of ulinastatin was added into the primary solution. The control group (Group C,n = 15) received normal saline instead of ulinastatin. A brochioalveolar lavage was performed at 2 h after the cardiopulmonary bypass. Polymorphonuclear neutrophil elastase, tumor necrosis factor-alpha and MDA contents in the brochioalveolar lavage fluids were measured, and the lung oxygenate index was measured preoperatively and at 1 and 4 h after CPB termination. RESULTS: Polymorphonuclear neutrophil elastase, tumor necrosis factor-alpha and MDA contents of Group U in the brochioalveolar lavage fulids were significantly lower than those of Group C (P < 0.05), and the lung oxygenate index of Group U at 1 and 4 h after CPB termination was also significantly lower than that of Group C. A significant increase of lung oxygenate index occurred in both groups at 1 and 4 h after CPB when compared with the same group at the baseline before CPB (P < 0.05). CONCLUSION: Ulinastatin has the protective effects on the lung injury during CPB by decreasing polymorphonuclear neutrophil elastase, alleviating lung inflammatory reaction and reducing oxygen free radicals.