title: Ultrasound biomicroscopy in recently postoperative 23-gauge transconjunctival vitrectomy sutureless self-sealing sclerotomy.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Ophthalmology, Vision Institute, Paulista School of Medicine, Federal University of São Paulo (UNIFESP), São Paulo, Brazil. apinto@doheny.org
authors.forename: Anderson
authors.initials: A
authors.lastname: Teixeira
authors.forename: Norma
authors.initials: N
authors.lastname: Allemann
authors.forename: Ana C N
authors.initials: AC
authors.lastname: Yamada
authors.forename: Fausto
authors.initials: F
authors.lastname: Uno
authors.forename: Andre
authors.initials: A
authors.lastname: Maia
authors.forename: Pedro P
authors.initials: PP
authors.lastname: Bonomo
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003228:Conjunctiva; D019773:Epiretinal Membrane / Q000601:surgery; D005260:Female; D006801:Humans; D007906:Lens Subluxation / Q000601:surgery; D008297:Male; D033401:Microscopy, Acoustic; D008866:Microsurgery / Q000379:methods*; D008875:Middle Aged; D011184:Postoperative Period; D011446:Prospective Studies; D012163:Retinal Detachment / Q000601:surgery; D012590:Sclera / Q000000981:diagnostic imaging* / Q000601:surgery*; D012599:Sclerostomy / Q000379:methods*; D012827:Silicone Oils / Q000008:administration & dosage; D013536:Suture Techniques; D014821:Vitrectomy / Q000379:methods*; D014945:Wound Healing
chemical_list: D012827:Silicone Oils