Long-term Treatment Outcomes for Malignant Glaucoma

Abstract

To report the contributing factors to the successful long-term treatment outcomes of a large series of patients with malignant glaucoma (MG). Retrospective, interventional, consecutive case series SUBJECTS: This study used data collected from 1997 to 2022 from the Glaucoma Division of the Stein Eye Institute, University of California, Los Angeles (UCLA). All patients with MG who underwent treatment at UCLA were enrolled. The following demographic and clinical data were collected and analyzed for their relevance to successful treatment: age, gender, ethnicity, and glaucoma family history, visual acuity (VA), intraocular pressure (IOP), lens status, prior glaucoma diagnosis, prior ocular surgery, prior use of anti-glaucoma agents, ultrasonic axial length, qualitative anterior chamber (AC) depth, and treatment methods and outcomes. Anatomical success was defined as restoration of normal AC depth, indicating relief of the MG episode. Complete success was defined as anatomical success and the reduction of IOP to < 21mmHg without further surgery, with or without medications. A total of 74 eyes of 73 patients were identified with a diagnosis of MG. The median (interquartile range) age of the patients at the time of MG presentation was 70 years (19.5), and 49 (75.4%) patients were female. The most common prior diagnosis before MG was primary angle closure glaucoma (PACG) (34 eyes, 51.5%). The initiating event for 30 eyes (45.5%) was glaucoma surgery and for 21 eyes (31.8%) was cataract surgery. Most eyes were pseudophakic (57, 86.4%). Fifty-six eyes underwent medical treatment; MG resolved in 2 eyes with medical treatment alone. Nine eyes (7 eyes = treatment naïve; 2 eyes = failed medical treatment) underwent laser treatment and MG resolved in 5 eyes. Among the 55 eyes which had surgical treatment, 52 eyes failed medical treatment and 3 eyes were treatment naïve. The anatomical success rate with surgical treatment was 96.4% and the most commonly performed surgical procedure was combined pars plana antero-central vitrectomy, hyaloido-zonulectomy and iridectomy. Female gender, PACG, and glaucoma surgery were predisposing factors for the development of MG. Medical treatment alone for MG was inadequate in the vast majority of cases. A surgical technique consisting of combined pars plana antero-central vitrectomy, hyaloido-zonulectomy and iridectomy consistently produced high long-term success.