Outcomes of 39 Canine Eyes Treated With Combined Endoscopic Cyclophotocoagulation and Ahmed Valve Gonioimplantation for Glaucoma.

Combined ECP and Ahmed valve implantation provides durable IOP control and vision preservation in canine glaucoma over 36 months.

This retrospective study evaluated long-term outcomes of combined endoscopic cyclophotocoagulation (ECP) and Ahmed valve gonioimplantation (AVG) in 39 canine eyes (32 dogs) with glaucoma, with a median follow-up of 26 months (range 12–65 months). IOP control (target <25 mmHg) was excellent throughout the study period: 96.9% at 12 months, 95.7% at 18 months, and 100% at 24, 30, and 36 months. Vision preservation, assessed via menace response, was maintained in approximately 69–75% of eyes at most time points, though it declined to 57.1% at 30 months before recovering. Notably, preoperative vision status was a significant predictor of postoperative visual outcome, while outcomes did not differ significantly between glaucoma types. Antiglaucoma medication burden decreased substantially, from a median of 3 medications preoperatively to 1 at 36 months postoperatively. Common complications included IOP spikes (46.2%), intraocular fibrin (23.1%), corneal ulceration (23.1%), uveitis (20.5%), and corneal edema (17.9%). Despite these complications, the combined ECP/AVG approach demonstrated durable IOP control and reasonable vision preservation over more than one year, supporting its use as an effective surgical strategy for canine glaucoma management. Preoperative patient selection, particularly assessing existing visual function, appears critical for optimizing postoperative outcomes.

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