高温高湿环境犬肢体火器伤后超氧化物歧化酶和丙二醛含量的变化

目的探讨高温高湿环境下肢体火器伤后组织脂质过氧化与抗氧化酶变化的规律。方法将犬随机分为常温常湿组、热习服组、高温高湿组,分别在致伤前及火器伤后1、3、4、6、8、10、14、18、24h检测外周血和伤道骨骼肌中超氧化物歧化酶(SOD)和丙二醛(MDA)含量。结果(1)每组SOD、MDA的含量在伤后14h内呈正相趋势;(2)高温高湿组中MDA含量开始升高和其峰值的时间点提前,分别为3h和6h,峰值显著高于其他两组(P<0.05),SOD的含量则相反;(3)热习服组SOD含量较高温高湿组升高;(4)三组14h后SOD、18h后MDA含量无差异。结论高温高湿火器伤可使机体内脂质过氧化反应增强,热习服则明显减低这种作用。

Dynamic changes of SOD and MDA in canine limbs with gunshot wound in hot and humid environment: an experimental study

Objective To study the dynamic changes in lipid peroxidation and the activity of antioxidative enzyme in canine limbs with gunshot wound in hot and humid environment. Methods Eighteen dogs with gunshot wound were randomly as-signed into 3 groups with equal numbers. Dogs observed after injury in normal environment was designated as NE group, those in hot and humid environment as HHE group and those in hot and humid environment with preceding heat acclimatiza-tion training as HA group. Contents of superoxide dismutase (SOD) and malonaldehyde (MDA) in both the peripheral blood and muscular tissues from gunshot wound tract were measured at 0, 1, 3, 4, 6, 8, 10, 14, 18 and 24 h respectively after the dogs had been wounded. Results Positive correlation between SOD and MDA contents was observed in each group. Three hours after injury, MDA level in HHE group began to ascend, reaching the peak level at 6 h that was significantly higher than those in the other 2 groups (P<0.05); SOD level underwent a reverse change, which was significantly lower in HHE group than in the other groups with that in HA group being the highest. Comparable SOD levels in the groups occurred at the time of 14 h, which happened to MDA levels 4 h later. Conclusion Gunshot injuries in the limbs of dogs exposed to hot and humid environ-ment induces increased free oxygen and aggravated the lipid peroxidation, which can be alleviated by heat acclimatization.