Steroid-induced glaucoma treated with trabecular ablation in a matched comparison with primary open-angle glaucoma

Background: To evaluate the outcomes of trabectome-mediated ab interno trabeculectomy in patients with steroid-induced glaucoma (SIG). Design: A retrospective, observational cohort study performed in the Department of Ophthalmology, University of Pittsburgh Medical Center. Participants: The data of 60 patients with SIG and 484 controls with primary open-angle glaucoma (POAG) matched by age, gender and glaucoma index were collected from the Trabectome Study Group database. Methods: Reduction of intraocular pressure (IOP) and medications were compared between POAG and SIG by multivariate regression. Kaplan-Meier was used for survival analysis. Success was defined as IOP <= 21 mmHg and at least 20% IOP reduction from baseline for any two consecutive visits after 3 months without secondary glaucoma surgery. Postoperative IOP and number of medications were compared with baseline in the SIG subgroups by the Wilcoxon test. Main Outcome Measures: Intraocular pressure reduction and 1-year success rate. Results: Patients with SIG had a higher baseline IOP (31.4 +/- 10.4 vs. 24.1 +/- 7.6mmHg, P<0.01) and obtained a greater IOP reduction than controls with POAG (48.4% vs. 31.5%, P<0.01). Multivariate regression showed that patients with SIG had an IOP reduction of 6.7 +/- 1.1mmHg more than those with POAG. Survival rates at 12 months were comparable at 86% in the SIG group and 85% in the POAG group (P=0.47). Patients with SIG with a high baseline IOP, younger age and advanced glaucoma experienced a larger IOP drop. Conclusion: Trabectome appears to be an effective surgical treatment in reducing IOP for patients with SIG.