Analysis On The Effect Of Points Of PRP In Vitrectomy For Proliferative Diabetic Retinopathy (â…¥)

Objective: Retrospective analysis of effects of points of panretinalphotocoagulation (PRP) in pars plana vitrectomy (PPV) for proliferativediabetic retinopathy.Methods: The sample size of58eyes undergone pars plana vitrectomy forproliferative diabetic retinopathy （VI）were divided into three groups accor-ding to points of PRP，including group A（<800points）,group B（800~1500points）and group C（>1500points）. The relation between PRP and thecorrected visual acuity, intraocular pressure (IOP)， recurrent vitreoushemorrhage，retinal nonperfusion and other complications were analysed.Results:(1) There was no statistical difference in postoperative correctvisual acuity In preoperation between three groups（P=0.642）.14eyes（73.68%）in groupA，19eyes（86.36%）in group B and14eyes（82.35%）in group C improved after Vitrectomy in postoperative correct visual acuity.(2)The sample size with high intraocular pressure were divided into two types,including a short term and a long term.There are30eyes（51.72%）,including9eyes（47.37%）in group A，13eyes（59.10%）in group B and8eyes（47.06%）in group C after Vitrectomy. These groups were no significantly differences(P=0.677) in a short term. After a month, there groups were different in a longterm (P=0.043).(3) In a short term,13eyes (22.41%）after vitrectomy presentedrecurrent vitreous hemorrhage including5eyes（23.32%） in group A,4eyes（18.18%） in group B and4eyes（23.53%） in group C.There were nostatistical differences among different tamponade in vitreous cavity (P=0.857).In a long term,There was a significant difference on recurrent vitreous hemorrhage among5eyes（26.31%）in group A，only1eye（4.55%）in groupB and no eyes in group C (P=0.020).（4）The eyes with anatomically retinalattachment after one surgery were55(94.83%), including17eyes (97.62%) inB group，21eye (95.45%) in B group and no eyes (100%) in C group.Conclusions:(1) PRP can effectively reduce the risk for visual loss aboutproliferative diabetic retinopathy patients.(2) Making the right amount ofpanretinal photocoagulation in vitrectomy effectively prevents recurrentvitreous hemorrhage. And moderate amounts of panretinal photocoagulationchanged blood support，delaying the progress of diabetic retinopathy.（3）Shortage of amounts of PRP could increase the risk of recurrent vitreoushemorrhage and lose control of intraocular pressure.（4）There is no obviousrelation to postoperative visual acuity between different groups of PRP.