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An 11-month-old 25.2-kg castrated male American Pit Bull Terrier was referred to the ophthalmology service of the University of California-Davis Veterinary Medical Teaching Hospital (VMTH) for a prolapsed gland of the nictitating membrane (“cherry eye”) in the right eye. The gland had been prolapsed for at least 7 months at the time of presentation and had been evaluated by the referring veterinarian (rDVM). Surgical correction had been attempted; however, during the anesthetic event, the rDVM noticed hypoxemia that was corroborated by results for oxygen saturation of hemoglobin measured with pulse oximetry (Spo2) < 90% and that did

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in Journal of the American Veterinary Medical Association

Abstract

OBJECTIVE To determine whether 2- or 3-times-daily application of topical ophthalmic 0.005% latanoprost solution is more effective at lowering intraocular pressure (IOP) in clinically normal dogs.

ANIMALS 9 clinically normal dogs.

PROCEDURES For each dog, I drop of latanoprost 0.005% solution was applied to 1 eye every 8 or 12 hours each day for 5 days; the contralateral eye received topical ophthalmic treatment with 1 drop of saline (0.9% NaCl) solution at the times of latanoprost application. Ocular examinations of both eyes were performed every 6 hours starting 48 hours prior to and ending 42 hours after the treatment period. Following a 5-week washout interval, the procedures were repeated but the previously latanoprost-treated eye of each dog received latanoprost application at the alternate frequency.

RESULTS Mean ± SD IOP reduction in the latanoprost-treated eyes was 31 ± 6.9% with 2-times-daily application and 33 ± 8.2% with 3-times-daily application. A 2-way repeated-measures ANOVA revealed significant differences in IOP with contributions by treatment (2 or 3 times daily), time of day (diurnal variation), and individual dog. The maximum mean daily IOP reduction in latanoprost-treated eyes was detected on day 3 of latanoprost treatment in each group. Eyes treated 3 times daily had significantly smaller pupil diameter and greater conjunctival hyperemia than eyes treated 2 times daily.

CONCLUSIONS AND CLINICAL RELEVANCE The clinical importance of the ocular hypotensive effects of 3-times-daily topical ophthalmic application of 0.005% latanoprost solution in dogs with glaucoma warrants investigation.

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in American Journal of Veterinary Research