瑞芬太尼对失血性休克兔急性肺损伤时脂质过氧化反应的影响

目的 探讨瑞芬太尼对失血性休克兔急性肺损伤时脂质过氧化反应的影响.方法 健康成年兔32只,随机分为4组(n=8):假手术组(S组)、急性肺损伤组(ALI组)、低剂量瑞芬太尼组(LR组)和高剂量瑞芬太尼组(HR组).ALI组、LR组和HR组经10 min股动脉放血至35～45 mm Hg制备急性肺损伤模型,LR组、HR组分别于放血前15 min静脉输注瑞芬太尼0.66、1.32μg·kg-1·min-1至处死动物.ALI组给予等容量生理盐水.于放血即刻(T1)、放血开始后20(T2)、70(T3)和100 min(T4)时经左侧股动脉采集血样,行血气分析,随后处死,取肺组织,光镜下观察肺组织病理学结果,计算肺湿干重比(W/D),测定MDA含量和SOD活性.结果 与S组比较,ALI组W/D、MDA含量升高,SOD活性降低(P＜0.05);与ALI组比较,LR组T2时pH值、T2～4时PaO2升高,HR组T2-4时pH值和PaCO2升高,LR组和HR组W/D、MDA含量降低,SOD活性升高(P＜0.05);与LR组比较,HR组W/D、MDA含量降低,SOD活性升高(P＜0.05).LR组和HR组肺组织病理学损伤程度较ALI组减轻,HR组较LR组减轻.结论 瑞芬太尼可通过抑制脂质过氧化反应减轻失血性休克兔急性肺损伤.

Effects of remifentanil on lipid peroxidation during hemorrhagic shock-induced acute lung injury in rabbits

Objective To investigate the effects of remifentanil on lipid peroxidation druing hemorrhagic shock-induced acute lung injury (ALI) in rabbits. Methods Thirty-two healthy adult rabbits weighing 2.0-2.5 kg were randomly divided into 4 groups (n = 8 each): sham operation group (group S); ALI group; low-dose remifentanil group (group LR); high-dose remifentanil group (group HR). The left femoral artery was cannulated for blood-letting and blood sampling. The right femoral artery was cannulated for remifentanil administration. The model of hemorrhagic shock was established by modified Wigger' s methods. In group S, only cannulation was performed. In group LR and HR, remifentanil was infused intraperitoneally at 0.66 and 1.32 μg·kg-1 ·min-1 15 min before blood-letting respectively, while group ALI received equal volume of normal saline instead. Arterial blood samples were taken at 0, 20,70 and 100 min after blood-letting (T1-4) for blood gas analysis. The animals were then sacrificed and the lungs were immediately removed for histological examination with light microscope and determination of W/D lung weight ratio, MDA content and SOD activity. Results W/D ratio and MDA content were significantly increased, while SOD activity was significantly decreased in group ALI compared with group S (P ＜0.05). The pH value at T2 and PaO2 at T2-4 in group LR and the pH value and PaCO2 at T2-4 in group HR were significantly higher than those in group ALI (P ＜ 0.05). W/D ratio and MDA content were significantly lower,while SOD activity was significantly higher in group LR and HR than in group ALI, and in group HR than in group LR (P ＜ 0.05). Remifentanil infusion significantly attenuated the pathologic changes in a dose-dependent manner. Conclusion Remifentanil pretreatment can attenuate hemorrhagic shock-induced ALI through inhibiting lipid peroxidation in rabbits.