Original Article Surgical Results of Trabeculectomy and Ahmed Valve Implantation Following a Previous Failed Trabeculectomy in Primary Congenital Glaucoma Patients

Abstract

Purpose: To compare the surgical results of trabeculectomy and Ahmed glaucoma valve implantation after a previous failed trabeculectomy. Methods: A retrospective comparative case series review was performed on 31 eye surgeries in 20 patients with primary congenital glaucoma who underwent trabeculectomy or Ahmed glaucoma valve implantation af-ter a previous failed trabeculectomy with mitomycin C. Results: The preoperative mean intraocular pressure was 25.5 mmHg in the trabeculectomy group and 26.9 mmHg in the Ahmed glaucoma valve implantation group (p = 0.73). The 48-month postoperative mean intra-ocular pressure was 19.6 mmHg in the trabeculectomy group and 20.2 mmHg in the Ahmed glaucoma valve implantation group (p = 0.95). The 12-month trabeculectomy success rate was 69%, compared with 64 % for Ahmed glaucoma valve implantation, and the 48-month success rates were 42 % and 36 % for trabeculectomy and valve implantation, respectively. The success rates following the entire follow-up period were not signifi-cantly different between the two groups (p> 0.05 by log rank test). Postoperative complications occurred in 25 % of the trabeculectomy-operated eyes and 9 % of the Ahmed-implanted eyes (p = 0.38). Conclusions: There was no significant difference in surgical outcome between the trabeculectomy and Ahmed glaucoma valve implantation groups, neither of which had favorable results. However, the trabeculectom

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