Cataract surgery in patients with glaucoma drainage implants: the hooked tube technique.

Cataract surgery has been reported to adversely affect the IOP control in eyes with the glaucoma drainage implant (GDI). One reason might be the flow of lens debris/viscoelastic material through the GDI tube into the bleb. This pilot study was conducted to determine the clinical results of a novel technique for temporary occlusion of the GDI tube with an iris retractor hook during phacoemulsification. Retrospective analysis of 15 patients (control group) who underwent phacoemulsification between January 2005 and December 2010 and 17 patients (treatment group) who underwent phacoemulsification with the hooked tube technique between January 2011 and April 2016 with a minimum 1-year follow-up. The IOP remained within 4 mmHg of the preoperative level in all eyes of the treatment group. Three eyes exhibited IOP spikes (≥ 10 mmHg) among controls. The mean postoperative IOP at 1 month was statistically significantly increased in the control group compared with the treatment group (P = 0.040). The number of antiglaucoma medications at 3 and 6 months was significantly increased in the control group (1.4 ± 1.1 vs. 1.7 ± 1.1; P = 0.041, 1.4 ± 1.1 vs. 2.3 ± 1.2; P = 0.017, respectively). After phacoemulsification, there was a significant increase in the mean number of antiglaucoma medications used at 6 months in the control group compared with the treatment group (P = 0.049). In both groups, one eye developed corneal decompensation. The hooked tube technique seems to provide an effective way to reduce the risk of the IOP spikes after cataract surgery in eyes with GDI.