title: Baerveldt tube implantation following failed deep sclerectomy versus repeat deep sclerectomy.
abstract: OBJECTIVE
  To compare the surgical outcomes of repeat deep sclerectomy (DS) and the Baerveldt glaucoma implant (BGI) in eyes with failed primary deep sclerectomy.
  
  
  METHODS
  A retrospective comparative case-control study.
  
  
  METHODS
  Fifty-eight eyes of 56 glaucoma patients with previously failed DS underwent BGI (group BGI) and 58 eyes of 55 patients underwent repeat DS (group DS) at a tertiary referral centre. Visual acuity, intraocular pressure (IOP), number of glaucoma medications, surgical failure rates and complication rates were compared between groups. Surgical failure was defined as loss of IOP control, loss of light perception, or need for further glaucoma surgery.
  
  
  RESULTS
  Baseline demographics were similar between groups. Preoperatively, median IOP was lower in the DS than the BGI group (19 mmHg versus 21 mmHg, p = 0.10). Postoperatively at year 1, median IOP was significantly higher in the DS than BGI group (14 mmHg versus 11 mmHg, p = 0.02). There were no differences between the DS and BGI groups in mean number of medications preoperatively (2.3 versus 2.6) or postoperatively (1.3 versus 1.1). Complication rates were significantly higher in the DS group [41 % (n = 24) versus 14 % (n = 8); p = 0.01]. The failure rate at 1 year was higher in eyes with repeat DS than in eyes with BGI (30 vs. 21 %, respectively; p = 0.07).
  
  
  CONCLUSIONS
  Baerveldt implants were more effective in lowering IOP and resulted in significantly fewer complications than repeat deep sclerectomy in eyes with previously failed deep sclerectomy.
authors.affiliation: Jules-Gonin Hôpital Ophtalmique, Avenue de France 15, Lausanne, 1004, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Bergin
authors.affiliation: Jules-Gonin Hôpital Ophtalmique, Avenue de France 15, Lausanne, 1004, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Petrovic
authors.affiliation: Clinic Montchoisi, Lausanne, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Mermoud
authors.affiliation: Clinic Montchoisi, Lausanne, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Ravinet
authors.affiliation: Jules-Gonin Hôpital Ophtalmique, Avenue de France 15, Lausanne, 1004, Switzerland. eamon.sharkawi@fa2.ch.
authors.forename: E
authors.initials: E
authors.lastname: Sharkawi
mesh_terms: D000368:Aged; D005260:Female; D005901:Glaucoma / Q000503:physiopathology / Q000601:surgery*; D020327:Glaucoma Drainage Implants; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D019919:Prosthesis Implantation; D012189:Retrospective Studies; D012590:Sclera / Q000601:surgery*; D012599:Sclerostomy; D014065:Tonometry, Ocular; D017211:Treatment Failure; D014792:Visual Acuity / Q000502:physiology
keywords: Baerveldt tube; Deep sclerectomy; Glaucoma filtration surgery; Repeat surgery