Glaucoma Surgery Comparison: SIBS Microshunt Versus Gelatin 45 µm Microstent Versus Trabeculectomy as Primary Surgical Interventions.

PURPOSE

Compare surgical success, risk factors, and postoperative course of the SIBS microshunt, gelatin 45 μm microstent, and trabeculectomy with mitomycin C (MMC) as a primary surgical intervention in patients with glaucoma. We present a multicenter,12-month, retrospective, nonrandomized, interventional case series.

DESIGN

Multicenter,12-month, retrospective, nonrandomized, interventional case series.

METHODS

Consecutive patients with glaucoma on maximally tolerated medical therapy received either primary SIBS microshunt, gelatin 45 µm microstent, or trabeculectomy with MMC as a stand-alone procedure at one of six participating centers (Canada, Italy, the Netherlands, Belgium, Singapore, Dominican Republic) from August 2015 to August 2020. Main outcome measures were proportion of eyes at 12-months with (1) no two consecutive intraocular pressures (IOPs) > 17 mm Hg or clinical hypotony (IOP < 6 mm Hg with a loss of> 2 lines of vision), without (complete) or with (qualified) glaucoma medications; and (2) ≥20% reduction from baseline IOP. Secondary outcomes included IOP thresholds of 14 and 21 mm Hg, median IOP, medications, risk factors, postoperative interventions, complications, and reoperations.

RESULTS

Records from 577 eyes from 521 patients with SIBS microshunt (n = 235), gelatin 45 μm microstent (n = 201), or trabeculectomy (n = 141) were included. Baseline decision IOP was lower in the SIBS group, and baseline number of glaucoma medications was also lower in the SIBS and trabeculectomy groups. After 12-month follow-up, complete success occurred in 68.8% of patients with SIBS microshunt, 46.2% with gelatin 45 μm microstent, and 58.0% with trabeculectomy (P = .0002). Qualified success occurred in 89.7%, 70.1%, and 83.6% of eyes, respectively (P = .0002). In the multivariate analysis, eyes receiving a gelatin 45 μm microstent relative to SIBS microshunt (hazard ratio [HR] 2.0; 95% confidence interval [CI] 1.5-2.7), trabeculectomy relative to SIBS microshunt (HR 1.6; 95% CI 1.2-2.2), or intraoperative MMC dose less than 0.4 mg/mL (HR 1.5; 95% CI 1.1-2.0) was significantly associated with failure. Complications occurred in 33.6%, 42.8% and 56% of eyes (P = .0001); needling in 12.3%, 29.9% and 22% (P < .0001); revisions in 10.6%, 8.5% and 8.5% (P = .68); and reoperations in 5.5%, 13.9% and 7.8% (P < .001) with SIBS microshunt, gelatin 45 μm microstent, or trabeculectomy, respectively.

CONCLUSIONS

Overall, patients with the SIBS microshunt achieved higher success rates compared to both trabeculectomy and the gelatin 45 μm microstent group, with fewer postoperative complications, interventions, and reoperations for glaucoma.