氪激光联合Nd:YAG激光行激光虹膜切除术后一过性眼压升高发病机制

目的:研究氪激光联合Q-开关Nd:YAG激光行激光虹膜切除术后一过性眼压升高的发病机制.方法:选取由本院动物实验中心提供的健康家兔42只84眼,其中雌兔18只,雄兔24只;平均质量2.24±0.31kg;随机分为6组,每组7只14眼,其中A、B、C、D、E组分别为激光虹膜切除术后20min,2、6、18、24h组;F组为正常对照组.观察各组术前及术后眼压和房水内丙二醛(malondialdehyde,MDA)、一氧化氮(nitric oxide,NO)、超氧化物歧化酶(superoxide dismutase,SOD)、6-酮-前列腺素F1α(6-酮-PGF1α)和一氧化氮合酶(nitric oxide synthase,NOS)含量的变化.结果:手术前各组眼压、房水内NO、NOS、SOD、MDA、6-酮-PGF1α含量对比差异均无统计学意义(P>0.05).术后6h内眼压升高,A、B、C组分别与F组比较,差异均有统计学意义(P<0.05),术后6h以后呈下降趋势,D、E组分别与F组比较,差异均无统计学意义(P>0.05).术后房水内NO、NOS、SOD含量呈下降趋势,A、B、C组分别与F组比较,差异均有统计学意义(P<0.05),术后6h以后慢慢恢复,D、E组分别与F组比较,差异均无统计学意义(P>0.05).术后房水内MDA和6-酮-PGF1α含量呈上升趋势,A、B、C组分别与F组比较,差异均有统计学意义(P<0.05),术后6h以后慢慢恢复,D、E组分别与F组比较,差异均无统计学意义(P>0.05).结论:激光虹膜切除术后一过性眼压升高与术后房水内MDA、6-酮-PGF1α含量升高和SOD、NO降低相关.

Study on the pathogenesis of transient intraocular pressure after laser iridectomy with Krypton laser combined with Q-switched Nd:YAG laser

·AIM:To study the pathogenesis of transient intraocular pressure ( IOP ) after laser iridectomy with Krypton laser combined with Q-switched Nd:YAG laser.· METHODS: Totally 42 healthy rabbits ( 84 eyes ) provided by the Animal Experimental Center of our hospital were selected, including 18 female rabbits, 24 male rabbits, average weight 2. 24±0. 31kg, and they were randomly divided into 6 groups, 7 rats in each group (14 eyes) . We observed the change of intraocular pressure after laser iridectomy surgery at 20min, 2, 6, 18, 24h and the nitric oxide ( NO ) , malondialdehyde ( MDA ) , superoxide dismutase ( SOD) , 6-keto-prostaglandin ( 6-keto-PGF1α) and nitric oxide synthase ( NOS) content in aqueous.· RESULTS: There was no significant difference in intraocular pressure, NO, NOS, SOD, MAD and 6-keto-PGF1α before operation ( P > 0. 05 ). The intraocular pressure increased after operation, and the difference was statistically significant (P<0. 05) at 20min, 2 and 6h after operation, and decreased at 18h after operation, 24h after operation (P>0. 05). The levels of NO, NOS and SOD in the aqueous humor of the two groups decreased 20min, 2 and 6h after the operation (P<0. 05), while increased after 6h, increased more at 18 and 24h. The difference with control group was no more significant (P>0. 05). The levels of MDA and 6-keto-prostaglandin in the aqueous humor increased after the operation, and the difference was statistically significant at 20min, 2 and 6h after operation (P<0. 05), while decreased at 18 and 24h and the difference with control group was not significant ( P>0. 05).· CONCLUSION: The increase of transient intraocular pressure after laser iridectomy may relate to the increase of malondialdehyde, 6-keto-prostaglandin content and the decrease of superoxide dismutase and nitric oxide in the aqueous humor after operation.