Micropulse transscleral cyclophotocoagulation in canine glaucoma: A retrospective study evaluating sweep velocity

Abstract

AbstractObjectiveTo report preliminary results of MP‐TSCP in canine patients with glaucoma while evaluating sweep velocity, treatment efficacy, and safety utilizing standardized surgical parameters.Animal studiedClient‐owned dogs that underwent MP‐TSCP at a veterinary referral hospital.ProcedureMedical records of 19 eyes (14 dogs) treated with MP‐TSCP were reviewed. Eleven eyes were treated with a 10 s/sweep (s) velocity and 8 eyes with a 20 s/s. Laser duty cycle was set at 31.3%, mean laser energy was 2766 mW, and mean duration was 120 s per hemisphere. Minimum post‐operative follow‐up was 6 months. Outcomes of intraocular pressure (IOP), vision status, degree of antiglaucoma medications, and complications were evaluated.ResultsThere was a significantly lower median (IQR) IOP (<25 mmHg) at each timepoint postoperatively compared to IOP pre‐operatively (p < 0.05). The overall success rate for IOP control at 6 months was 84%, 100% for the 10 s/s and 62.5% for the 20 s/s. Vision was preserved in 10/11 (90%) eyes from the 10 s/s group and 4/8 (50%) eyes from the 20 s/s group at 6 months. Average number of glaucoma medications in the 10 s/s group decreased from 4.4 to 1.5 and from 3.3 to 2.5 in the 20 s/s group. Post‐operative complications were mild and resolved within 1 week.ConclusionsMP‐TSCP is a non‐invasive treatment alternative for canine glaucoma. Employing higher energy levels rendered long‐term IOP control while retaining a high safety profile with minimal postoperative complications. There was no statistical difference between a 10 s/s and 20 s/s surgical velocity, both leading to successful surgical outcomes up to 6 months post‐operatively.