Outcomes of Wider Area Bleb Revision Using Bleb Knife With Adjunctive Mitomycin C

Wider area bleb revision using bleb knife with adjunctive mitomycin C (MMC) had a good success rate, according to strict success criteria, except in patients with neovascular glaucoma (NVG).

We determined the efficacy of wider area bleb revision after filtering surgery using bleb knife with adjunctive MMC.

In this retrospective single-center study, we analyzed 86 patients with glaucoma (46 primary open-angle, 18 exfoliations, 13 secondary, and 9 neovascular) after bleb revision using bleb knife with adjunctive MMC after a minimum follow-up of 6 months. A Kaplan-Meier survival analysis with log-rank tests and Cox proportional hazards regression analyses were performed. The main outcome measure was a successful initial bleb revision using bleb knife with adjunctive MMC, arbitrarily defined as intraocular pressure (IOP) control <15 mm Hg without any IOP-lowering medication, additional bleb revision, or glaucoma surgery.

The mean time since the initial filtering surgery was 243.8 days, and the mean prebleb revision IOP was 22.0±4.8 mm Hg. The total cumulative success rate of the bleb revision using bleb knife with MMC was 49% at 6 months and 30% at 1 year. Patients with primary open-angle glaucoma had the best success rate (64% at 6 mo and 40% at 1 y). Log-rank tests revealed that patients with NVG had the worst prognosis (P<0.01). NVG was the only significant risk factor identified for short survival time (odds ratio, 167.10; 95% confidence interval, 1.78-15620.44; P=0.027).

Wider area bleb revision using bleb knife with adjunctive MMC had a good success rate, according to strict success criteria, except in patients with NVG.