PURPOSE: To evaluate the ultrasound biomicroscopy (UBM) images of recent postoperative 23-gauge vitrectomy using single- and 2-step techniques. METHODS:Twelve consecutive eyes were randomized and submitted to 23-gauge sutureless transconjunctival vitrectomy surgery divided in 2 groups: 1) using a beveled trocar to insert the microcannula (single step) and 2) using a stiletto blade to perform first a tunnel incision and then insert the microcannula (2 steps). All patients underwent 3-port vitrectomy with a straight angled incision of 20 degrees to 30 degrees. Ultrasound biomicroscopy examination was performed after 8 days to 10 days of surgery to locate and document the sclerotomy sites. RESULTS: All patients had at least two diameters of the incision measured, and all wounds were constructed obliquely. Single-step sclerotomy mean size was 375.40 microm +/- 83.70 microm (range, 280.4-695 microm) and coefficient of variation (CV) was 0.21. Two-step sclerotomy mean size was 315.5 microm +/- 56.8 microm (range, 253.2-362.5 microm; CV = 0.26; P =0.556). Two patients had an intraocular 5,000 centistokes silicone oil injection, one for each group. Only in the single-step incision was silicone oil observed in the wound. CONCLUSION:Twenty-three-gauge single- and two-step sclerotomies showed no statistical difference in site diameter at UBM. Postoperative UBM examination allowed the evaluation of the wound architecture. A large sample size comparing both surgical techniques should provide a statistical difference.
RCT Entities:
PURPOSE: To evaluate the ultrasound biomicroscopy (UBM) images of recent postoperative 23-gauge vitrectomy using single- and 2-step techniques. METHODS: Twelve consecutive eyes were randomized and submitted to 23-gauge sutureless transconjunctival vitrectomy surgery divided in 2 groups: 1) using a beveled trocar to insert the microcannula (single step) and 2) using a stiletto blade to perform first a tunnel incision and then insert the microcannula (2 steps). All patients underwent 3-port vitrectomy with a straight angled incision of 20 degrees to 30 degrees. Ultrasound biomicroscopy examination was performed after 8 days to 10 days of surgery to locate and document the sclerotomy sites. RESULTS: All patients had at least two diameters of the incision measured, and all wounds were constructed obliquely. Single-step sclerotomy mean size was 375.40 microm +/- 83.70 microm (range, 280.4-695 microm) and coefficient of variation (CV) was 0.21. Two-step sclerotomy mean size was 315.5 microm +/- 56.8 microm (range, 253.2-362.5 microm; CV = 0.26; P =0.556). Two patients had an intraocular 5,000 centistokes silicone oil injection, one for each group. Only in the single-step incision was silicone oil observed in the wound. CONCLUSION: Twenty-three-gauge single- and two-step sclerotomies showed no statistical difference in site diameter at UBM. Postoperative UBM examination allowed the evaluation of the wound architecture. A large sample size comparing both surgical techniques should provide a statistical difference.