title: Intraocular Pressure Control after Implantation of an Ahmed Glaucoma Valve in Eyes with a Failed Trabeculectomy.
abstract: OBJECTIVE
  To evaluate the results of Ahmed glaucoma valve (AGV) in eyes with a failed trabeculectomy.
  
  
  METHODS
  This retrospective study evaluated 61 eyes with a failed trabeculectomy that underwent implantation of an AGV due to uncontrolled intraocular pressure (IOP) on maximal medical therapy. Success was defined as IOP ≤ 21 mm Hg (criterion 1) or 20% reduction in IOP (criterion 2) with or without antiglaucoma medications. Persistent hypotony, loss of light perception, and reoperation for IOP control were defined as failure.
  
  
  RESULTS
  Mean preoperative IOP and mean lOPs at 6, 12, and 24 months were 21.93 ± 6.32 mm Hg (n = 61), 14.15 ± 4.33 mm Hg (n = 59), 13.21 ± 4.44 mm Hg (n = 56), and 13.60 ± 3.27 mm Hg (n = 25) respectively. Mean number of antiglaucoma medications preoperatively and at 6, 12, and 24 months was 3.95 ± 0.85, 2.19 ± 1.38, 2.48 ± 1.44, and 2.40 ± 1.32 respectively. The reductions in the number of medications and IOP measurements were statistically significant at all time intervals (p < 0.001, Wilcoxon signed rank test). According to criterion 1, the Kaplan-Meier survival curve disclosed success rates of 75% at 12 and 24 months. According to criterion 2, the success rates were 57% at 12 months and 55% at 24 months. The most frequent complications were hypertensive phase (18%) and shallow anterior chamber (16.4%).
  
  
  CONCLUSIONS
  The AGV may effectively reduce IOP in eyes that had a failed trabeculectomy.
  
  
  CONCLUSIONS
  The AGV is an alternative in eyes with a failed trabeculectomy.
  Schimiti RB, Abe RY, Tavares CM, Vasconcellos JPC, Costa VP. Intraocular Pressure Control after Implantation of an Ahmed Glaucoma Valve in Eyes with a Failed Trabeculectomy. J Curr Glaucoma Pract 2016;10(3):97-103.
authors.affiliation: Professor and Assistant, Department of Ophthalmology, Pontifical University; Eye Hospital of Londrina (HOFTALON), Londrina, PR, Brazil University of Campinas, São Paulo, Brazil.
authors.forename: Rui B
authors.initials: RB
authors.lastname: Schimiti
authors.affiliation: Postgraduate Student, Department of Ophthalmology, University of Campinas, São Paulo, Brazil.
authors.forename: Ricardo Y
authors.initials: RY
authors.lastname: Abe
authors.affiliation: Resident, Department of Ophthalmology, University of Campinas, São Paulo, Brazil.
authors.forename: Carla M
authors.initials: CM
authors.lastname: Tavares
authors.affiliation: Professor, Department of Ophthalmology, University of Campinas, São Paulo, Brazil.
authors.forename: Jose Pc
authors.initials: JP
authors.lastname: Vasconcellos
authors.affiliation: Professor, Department of Ophthalmology, University of Campinas, São Paulo, Brazil.
authors.forename: Vital P
authors.initials: VP
authors.lastname: Costa
keywords: Ahmed glaucoma valve; Glaucoma surgery; Intraocular pressure; Retrospective study.