Surgical Results of Trabeculectomy among Groups Stratified by Prostaglandin-Associated Periorbitopathy Severity

Abstract

To report the role of prostaglandin-associated periorbitopathy (PAP) severity in the surgical effectiveness of trabeculectomy (LEC). Retrospective observational case series. A total of 139 consecutive eyes of 139 Japanese subjects (74 men, 65 women; mean age ± standard deviation, 65.7 ± 10.6 years) who underwent LEC were included. All had primary open-angle glaucoma (POAG), no history of conjunctival incisional surgery, completed all postoperative visits for 12 months, and information on the PAP severity using the Shimane University PAP Grading System (SU-PAP). Data were collected from a medical chart review at 2 hospitals. Comparison of surgical success rates among groups stratified by SU-PAP grades 0 to 3 by survival curve analysis using the definitions of failure based on surgical intervention other than laser suture lysis (LSL), intraocular pressure (IOP) reduction below 20%, postoperative IOP exceeding 15 mmHg (definition A) or 12 mmHg (definition B), and a postoperative IOP below 6 mmHg. Twelve months postoperatively, the success rates of grades 0, 1, 2, and 3 were 86%, 68%, 40%, and 0%, respectively, for definition A (P < 0.0001, log-rank test) and 86%, 61%, 36%, and 0%, respectively, for definition B (P < 0.0001). Interventions other than LSL (P < 0.0001, Cochran-Armitage trend test), IOP reduction less than 20% (P= 0.010), and IOP exceeding 15 mmHg (P= 0.016) or 12 mmHg (P < 0.0001) were associated with surgical failure; IOP under 6 mmHg was not (P= 0.31). The proportional hazard model for definition A showed that compared with grade 0, grade 2 (risk ratio [RR], 5.82, P= 0.0043) and grade 3 (RR, 12.2, P= 0.0003) were associated with surgical failure. For definition B, grade 1 (RR, 3.53, P= 0.040), grade 2 (RR, 6.65, P= 0.0021), and grade 3 (RR, 12.0, P= 0.0003) were associated with surgical failure. Differences in age, gender, preoperative IOP and medications, refractive error, and simultaneous cataract surgery were not associated with surgical failure in both models. The preoperative presence of severe PAP worsens the 1-year success rate of LEC in patients with POAG. To retain the surgical effectiveness, treating physicians should prevent patients from progressing to severe PAP, an avoidable side effect, by switching or stopping the causative medications. Proprietary or commercial disclosure may be found after the references.