title: Incidence of postoperative hypotony in 25-gauge vitrectomy: oblique versus straight sclerotomies.
abstract: OBJECTIVE
  To compare the incidence of hypotony after oblique and straight sclerotomies in 25-gauge transconjunctival sutureless vitrectomy (TSV).
  
  
  METHODS
  Retrospective, comparative, interventional case series.
  
  
  METHODS
  Two hundred seventy-five eyes of 250 patients.
  
  
  METHODS
  We reviewed 275 consecutive cases of 25-gauge TSV. Oblique incisions were performed on 141 eyes and straight incisions on 134 eyes.
  
  
  RESULTS
  On postoperative day 1, there was no significant difference in the incidence of hypotony (9.9% vs. 9.2%; p = 0.85) between oblique and straight incisions. The type of incision showed no statistical effect on hypotony in eyes filled with fluid (p = 0.91) or air-gas (p = 0.81). Hypotony was significantly reduced using air-gas endotamponade (4.8%) as compared to fluid-filled eyes (20.0%; p = 0.0001).
  
  
  CONCLUSIONS
  Oblique incisions do not reduce the incidence of postoperative hypotony in fluid-filled eyes or with air-gas tamponade. Air-gas tamponade use results in a 4-fold reduction in the incidence of hypotony.
authors.affiliation: Centre Universitaire D'Ophtalmologie de Québec, Hôpital du Saint-Sacrement, Québec, Qué. serge.bourgault.1@ulaval.ca
authors.forename: Serge
authors.initials: S
authors.lastname: Bourgault
authors.forename: Eric
authors.initials: E
authors.lastname: Tourville
mesh_terms: D000368:Aged; D058450:Endotamponade; D005260:Female; D006801:Humans; D015994:Incidence; D007429:Intraocular Pressure; D008297:Male; D008866:Microsurgery; D008875:Middle Aged; D015814:Ocular Hypotension / Q000453:epidemiology* / Q000209:etiology; D011183:Postoperative Complications; D012189:Retrospective Studies; D012599:Sclerostomy / Q000379:methods*; D014065:Tonometry, Ocular; D014821:Vitrectomy; D057586:Vitreoretinal Surgery