title: Primary pars plana vitrectomy versus scleral buckle surgery for the treatment of pseudophakic retinal detachment: a randomized clinical trial.
abstract: OBJECTIVE
  To compare the anatomical and functional outcome of scleral buckle (SB) surgery with that of pars plana vitrectomy (PPV) alone in the treatment of primary rhegmatogenous pseudophakic retinal detachment (RD).
  
  
  METHODS
  In this prospective, randomized clinical trial, 150 eyes of 150 patients with pseudophakic RD and proliferative vitreoretinopathy (PVR) stage B or less were randomized to SB surgery (75 eyes) or primary PPV (75 eyes). SB surgery involved break localization, cryotherapy, placement of a circumferential 240 style 2.5-mm solid silicone band, combined with a local buckle when indicated, and transscleral drainage of subretinal fluid. PPV included extensive vitreous removal, perfluoro-n-octane injection or endodrainage of subretinal fluid to flatten the retina, cryopexy treatment of breaks, and fluid/air exchange with injection of 20% SF6. Postoperative follow-up was 1 year. Break diagnosis, operating time, intraoperative and postoperative complications, retinal reattachment rate for single as well as multiple surgeries, axial length changes, and best-corrected visual acuity at 1 year after surgery were the main outcome measures.
  
  
  RESULTS
  The number of eyes that were diagnosed with additional breaks inter-operatively was higher in the PPV group (P=0.004, chi test). Mean operating time was significantly less (P=0.0001, t-test) in the PPV group. With a single surgery, the retina was reattached in 62 eyes (83%) in the SB surgery group and in 71 eyes (94%) in the PPV group (P=0.037, Fisher exact test). With subsequent surgeries, final anatomical reattachment was achieved in 71 cases in the SB surgery group and in 74 cases in the PPV group (P=0.37, Fisher exact test). Mean axial length change at 1 year was 0.95 mm in the SB surgery group and 0.1 mm in the PPV group (P=0.0001, t-test). Mean final best-corrected visual acuity (logMAR) was 0.40 in the SB surgery group and 0.33 in the PPV group (P=0.26, t-test).
  
  
  CONCLUSIONS
  Primary PPV offers potential advantages over SB surgery in the treatment of pseudophakic RD, including less operating time, accurate diagnosis of breaks, higher reattachment rate with a single surgery, and no postoperative axial length changes. Retinal reattachment rate with multiple surgeries and final visual acuity at 1 year were similar for SB surgery and PPV.
authors.affiliation: Department of Ophthalmology, Aristotle University, Thessaloniki, Greece.
authors.forename: Periklis D
authors.initials: PD
authors.lastname: Brazitikos
authors.forename: Sofia
authors.initials: S
authors.lastname: Androudi
authors.forename: William G
authors.initials: WG
authors.lastname: Christen
authors.forename: Nikolaos Tr
authors.initials: NT
authors.lastname: Stangos
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005466:Fluorocarbons / Q000008:administration & dosage; D006801:Humans; D007267:Injections; D007431:Intraoperative Complications; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011446:Prospective Studies; D019591:Pseudophakia / Q000150:complications / Q000601:surgery*; D012086:Reoperation; D012163:Retinal Detachment / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D012591:Scleral Buckling / Q000379:methods*; D013459:Sulfur Hexafluoride / Q000008:administration & dosage; D016896:Treatment Outcome; D014792:Visual Acuity; D014821:Vitrectomy / Q000379:methods*
chemical_list: D005466:Fluorocarbons; C073608:perfluorooctane; D013459:Sulfur Hexafluoride