Abstract
BACKGROUND: This study aimed to evaluate the incidence and risk factors for early transient intraocular pressure (IOP) elevation after penetrating canaloplasty (PCP) in patients with primary open-angle glaucoma (POAG), primary angle-closure glaucoma (PACG) and secondary glaucoma (SG). METHODS: This retrospective study included 198 eyes of 198 patients with glaucoma. Participants were classified as normal IOP, early transient high IOP (E-HIOP [Tst]), early persistent IOP elevation, late transient high IOP, and late persistent IOP elevation, based on the period and persistence of postoperative IOP elevation. RESULTS: E-HIOP (Tst) developed in 34.8%, 33.3%, and 40.9% of eyes with POAG, PACG, and SG, respectively. In comparison with normal IOP group, we observed the following variations in E-HIOP (Tst) cohorts: 8 - 10 years younger in patients with POAG and PACG; higher prevalence of hyphema (45.5% vs. 20.5%) in POAG; higher baseline IOP in PACG and SG (7 - 8 mmHg); higher preoperative IOP maximum (IOP(pre-max)) in SG (all p < 0.05). Higher IOP(pre-max) was a risk factor for E-HIOP (Tst) in PACG and SG (p < 0.05). CONCLUSIONS: Nearly 30 - 40% of eyes developed E-HIOP (Tst) after PCP. E-HIOP (Tst) tended to develop in younger participants and those with higher preoperative IOP. A higher IOP(pre-max) was a risk factor for E-HIOP (Tst) in PACG and SG.