The clinical analysis of the pre-macular residual vitreous in pars plana vitrectomy

Abstract

Objective To analyse the clinical features of patients who had the pre-macular residual vitreous in pars plana vitrectomy (PPV). Methods Triamcinolone acetonide-assisted pars plana vitrectomy was performed on 509 eyes of 484 cases. The front and central vitreous body was removed, and the Triamcinolone acetonid (TA) was injected to check if there was posterior vitreous detachment. The pre-macular residual vitreous was observed during the operation. The relationship between residual vitreous and age, primary disease and the duration of the disease was analyzed. Results Of the 509 eyes, the pre-macular residual vitreous occurred in 34 eyes and the residual rate was 6.68%. The rates of the pre-macular residual vitreous in different ages were 18.64% in 0~20 years group, 7.88% in 21~40 years group, 4.17% in 41~60 years group, 2.15% in 60~76 years group. OR value of Logistic regression analysis of binary classification variables was 0.445, and 95% confidence interval was 0.298-0.666. The residual rate in rhegmatogenous retinal detachment (RRD) group was 11.61%.The residual rate in ocular trauma group was 10.52%. The difference in residual rate of RRD and ocular trauma cases was significantly highter than the other cases (χ2=16.104, P<0.001). The average occurrence time of RRD group and ocular trauma group were (10.39±6.02) days and (10.90±4.70) days respectively. Conclusion The pre-macular residual vitreous is easier to occur in patients who have RRD, ocular trauma, younger age, and at the early stages of diseases. Key words: Vitrectomy; Residual vitreous; Triamcinolone acetonide