Prognosis observation on pars plana vitrectomy for proliferative diabetic retinopathy

Objective:To retrospectively review the clinical outcome of pars plana vitrectomy(PPV) for patients with proliferative diabetic retinopathy(PDR).Methods:Data of 242 patients(288eyes) at Beijing Tongren Eye Center from 2002 to 2006 were retrospectively reviewed.According to the B-mode ultrasonic observation before surgery and ocular fundus during surgery,the reviewed cases were divided into four groups: vitreous hemorrhage but without retinal detachments,extensive fibrovascular vitreous membranes with limited traction retinal detachment but not involving the macular area,traction retinal detachment involving the macular,and combined phacoemusification and PPV.Results:Visual improvements were as follows: 84.9% in the group of patients with vitreous hemorrhage without retinal detachments(groupⅠ),81.1% in the group of patients with extensive fibrovascular vitreous membranes with limited traction retinal detachment but not involving the macular area(groupⅡ),41.9% in the group of patients with traction retinal detachment involving the macular(groupⅢ),and 72% in the group of patients with combined phacoemusification and PPV(groupⅣ).The visual improvement between groupⅠ and groupⅡ had no statistical difference through χ2 test(χ2=0.529,P=0.467),while the visual improvement difference of group,Ⅱand Ⅳ had statistical significance(P=0.000 1,0.000 1,0.016 respectively).Conclusion:Pars plana vitrectomy is an effective treatment for PDR and the treatment may acquire an ideal vision prognosis as the macular area is not obviously involved.