The effect of prophylactic 180～ peripheral laser retinopexy during primary vitrectomy surgery on inferior rhegmatogeuous retinal redetachment after silieone oil removal

Objective To investigate the effect of prophylactic 180°peripheral laser retinopexy dur- ing primary vitrectomy surgery on inferior rhegmatogenous retinal redetachment after silicone oil removal. Methods The clinical data of 142 patients who undertaken previous vitreetomy combined with silicone oil tamponade and later silicone oil removal surgery were retrospectively analyzed.Eighty-one patients (photoco- agulation group) was take prophylactic 180-degree dykelike laser retinopexy during the previous vilreoretinal surgery before the secondary silicone oil removal while 61 patients (control group) weren't.The incidence,time.the cause of retinal redetaehment and the complications of laser retinopexy after silicone oil removal intwo groups were observed.Results The duration of silicone oil tamponade was 7-24 weeks,averaging 11.8-2.6 weeks.During the period above.16 cases of retinal redetachment occurred;among them,there were 6 cascs (7.4%) in the photoeoagulation group (4 proliferative vitreoretinopathy cases,1 new break case,l un- known case) and 10 cases (16.4%) in the control group (7 cases resulted from omission of small retinal breaks or reopening of original hole.3 proliferative vitreoretinopathy cases).The difference belween two groups Was statistically significant(P<0.05).Eleven cages of retinal redetachment were recorded after silicone oil removal,including 3 casos (3.7%) in photocoagulation group (2 cases resulted from new tractional hole by nearby proliferative membrane.1 photocoagulation spot hole case) and 8 cases (11.4%) in control group (4 proliferative vitreoretinopathy Cases,2 reopening of primary retinal break cases,and 2 newly formed breaks beside the primary retinal breaks).Conclusions Prophylactic 180-degree peripheral laser retinopexy during primary vitrectomy surgery on inferior rhegmatogenous retinal redetachment is associated with a decrease of the incidence of retinal redetachment after removal of silicone oil. Key words: Retinal detachraent/prevention continal; Retinal detachment/surgery; Laser coagulation;