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VOLUME 10 , ISSUE 3 ( September-December, 2016 ) > List of Articles

Original Article

Intraocular Pressure Control after Implantation of an Ahmed Glaucoma Valve in Eyes with a Failed Trabeculectomy

Rui B Schimiti, Ricardo Y Abe, Carla M Tavares, Jose PC Vasconcellos, Vital P Costa

Keywords : Ahmed glaucoma valve, Glaucoma surgery, Intraocular pressure, Retrospective study

Citation Information : B Schimiti R, Y Abe R, M Tavares C, PC Vasconcellos J, P Costa V. 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.

DOI: 10.5005/jp-journals-10008-1209

License: CC BY-NC 4.0

Published Online: 01-08-2019

Copyright Statement:  Copyright © 2016; The Author(s).


Abstract

Aim: To evaluate the results of Ahmed glaucoma valve (AGV) in eyes with a failed trabeculectomy. Materials and 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%). Conclusion: The AGV may effectively reduce IOP in eyes that had a failed trabeculectomy. Clinical significance: The AGV is an alternative in eyes with a failed trabeculectomy.

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