银杏叶提取物对大鼠机械通气所致肺损伤SOD、MDA的影响

摘要

Objective To investigate the effect of EGB on SOD, MDA of ventilator-induced lung injury in rats and its possible mechanisms. Methods Thirty male SD rats were randomly divided into 3 groups: control group (C group), high tidal ventilation group (H group) and EGB group (E group). The setting mechanical ventilation was VT=30 mL/kg, RR=40/min, I/E=1/3, PEEP=0 cmH2 O and FiO2=21%. The broncho-alveolar lavage fluid (BLAF) and serum were obtained for determination of the levels of SOD and MDA at the end of 4 h mechanical ventilation. The Lungs were removed, and the wet-to-dry weight ratio (W/D) and pulmonary pathologic changes were measured. Results As compared with C group, W/D and the levels of MDA were significantly increased in H group, but the levels of SOD were reduced in H group. As compared with H group, W/D and the levels of MDA were significantly decreased in E group, but the levels of SOD were increased in E group. Pulmonary pathologic changes were alleviated in E group comparing with H group. Conclusion EGB injection may have a protective role against hyperoxia and induced pulmonary damage in rats.%目的：研究银杏叶提取物对大鼠机械通气所致肺损伤超氧化物歧化酶（ SOD ）、丙二醛（ MDA ）的影响及机制。方法：将30只雄性SD大鼠随机分为3组：对照组（C组）、大潮气量组（H组）和银杏叶提取物组（ E 组）。H 组和 E 组设置机械通气潮气量30 mL/kg ，呼吸频率40次/min ， I/E 为1/3，呼气末正压为0 cmH2O，吸入氧浓度为21％。机械通气4 h 后收集支气管肺泡灌洗液和血清测定SOD和MDA 的水平，取肺组织测定肺湿/干重比（W/D），观察肺组织病理改变。结果：H 组与C组相比，MDA、W/D水平均显著增高，SOD水平则显著降低；E组与H组相比，大鼠MDA、W/D水平均显著降低，SOD水平则显著升高。肺组织病理改变显示E组的病理损害明显比H组减轻。结论：银杏叶提取物能减轻肺水肿，减少机械通气所致的肺损伤。