2021 journal article

Gonioscopic iridocorneal angle morphology and incidence of postoperative ocular hypertension and glaucoma in dogs following cataract surgery

VETERINARY OPHTHALMOLOGY, 24, 50–62.

By: A. Zibura n, J. Robertson n  & H. Westermeyer n 

co-author countries: United States of America πŸ‡ΊπŸ‡Έ
author keywords: canine; glaucoma; gonioscopy; iridocorneal angle; phacoemulsification; postoperative hypertension
MeSH headings : Age Factors; Animals; Cataract / complications; Cataract / pathology; Cataract / veterinary; Cornea / pathology; Dog Diseases / epidemiology; Dog Diseases / pathology; Dog Diseases / surgery; Dogs; Female; Glaucoma / epidemiology; Glaucoma / etiology; Glaucoma / pathology; Glaucoma / veterinary; Gonioscopy / veterinary; Incidence; Iris / pathology; Male; Ocular Hypertension / epidemiology; Ocular Hypertension / etiology; Ocular Hypertension / pathology; Ocular Hypertension / veterinary; Phacoemulsification / adverse effects; Phacoemulsification / veterinary; Postoperative Complications / epidemiology; Postoperative Complications / veterinary; Retrospective Studies; Risk Factors; Sex Factors
Source: Web Of Science
Added: July 27, 2020

Purpose To investigate the relationship between gonioscopic iridocorneal angle (ICA) morphology and the incidence of postoperative ocular hypertension (POH) and postoperative glaucoma in dogs undergoing cataract surgery. Animals studied Retrospective analysis of 138 eyes of 78 canine patients who underwent phacoemulsification at North Carolina State University from December 1, 2015 through April 30, 2017. Methods Medical records of all phacoemulsification patients with preoperative RetCam gonioscopic images were reviewed for preoperative, intraoperative, and postoperative variables. Gonioscopic angle indices were calculated using a novel (ZibWest) angle grading system, and these indices were analyzed for outcome-related significance. Results Increased surgeon experience was associated with increased probability of POH and vision loss. Higher average ZibWest Angle indices (ie, more open angles with less pectinate ligament dysplasia/ abnormality) were associated with a significantly decreased probability of medically unresponsive glaucoma. Increased patient age was significantly associated with an increased probability of both postoperative glaucoma and vision loss. Female dogs were significantly more likely to experience postoperative glaucoma compared to male dogs. Increased surgery time was significantly associated with increased probability of vision loss. Conclusions The ZibWest angle index may predict increased risk for developing medically unresponsive glaucoma with cataract surgery. Female sex, and increased patient age, surgical time, and surgeon experience were associated with increased postoperative morbidity.