Cataract Surgery After Trabeculectomy: The Effect on Trabeculectomy Function | Cataract and Other Lens Disorders | JAMA Ophthalmology | JAMA Network
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Clinical Sciences
Journal Club
Feb 2012

Cataract Surgery After Trabeculectomy: The Effect on Trabeculectomy Function

Journal Club PowerPoint Slide Download
Author Affiliations

Author Affiliations: Singapore National Eye Center and Singapore Eye Research Institute (Drs Husain, Liang, Oen, Seah, and Aung) and Yong Loo Lin School of Medicine, National University of Singapore (Drs Chew and Aung); and National Institute for Health Research Biomedical Research Centre for Ophthalmology at Moorfields Eye Hospital and University College London Institute of Ophthalmology, London, England (Drs Husain, Foster, Gazzard, Bunce, and Khaw).

Arch Ophthalmol. 2012;130(2):165-170. doi:10.1001/archophthalmol.2011.329
Abstract

Objective To determine whether the timing of cataract surgery after trabeculectomy has an effect on trabeculectomy function in terms of intraocular pressure control.

Methods This was a cohort study nested within a randomized clinical trial. There were 235 participants with glaucoma who had a single previous trabeculectomy augmented with either intraoperative 5-fluorouracil or placebo. Cataract surgery with intraocular lens implantation was performed on participants judged to have significant lens opacity. Cox regression was performed to evaluate the effect of time between trabeculectomy and cataract surgery on the time to trabeculectomy failure, after adjusting for other relevant risk factors. The main outcome measure was time to failure of trabeculectomy, defined as an intraocular pressure of greater than 21 mm Hg.

Results Of the 235 participants, 124 (52.7%) underwent subsequent cataract surgery. The median time from trabeculectomy to cataract surgery for these patients was 21.7 months (range, 4.6-81.9 months). The median follow-up period was 60 months (range, 28-84 months) for the cataract surgery group and 48 months (range, 12-84 months) for the non–cataract surgery group. Cox regression showed that the time from trabeculectomy to cataract surgery was significantly associated with time to trabeculectomy failure (hazard ratio, 1.73 [95% CI, 1.05-2.85]; P = .03). The adjusted declining hazard ratios for risk of subsequent trabeculectomy failure when cataract surgery was performed 6 months, 1 year, and 2 years after trabeculectomy were 3.00 (95% CI, 1.11-8.14), 1.73 (95% CI, 1.05-2.85), and 1.32 (95% CI, 1.02-1.69), respectively.

Conclusions Cataract surgery after trabeculectomy increases the risk of trabeculectomy failure, and this risk is increased if the time between trabeculectomy and cataract surgery is shorter.

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