Effect of topical tropicamide on tear production as measured by Schirmer's tear test in normal dogs and cats (original) (raw)
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Open Veterinary Journal
Background: Cyclopentolate is not commonly used as mydriatic drug in veterinary medicine because of limited data on the local and systemic effects in animals.Aim: To determine the effects of topical 1% cyclopentolate hydrochloride on intraocular pressure (IOP), horizontal pupil diameter (HPD) and tear production in the cat and rabbit’s eye during the first hour and up to 36 hours after treatment.Methods: One drop of 1% cyclopentolate hydrochloride was used in the left eye in 10 clinically and ophthalmologically healthy domestic cats and 10 rabbits. IOP and HPD were recorded every 5 minutes during the first hour, then every 2 hours during the following 12-hour period, and at 24 and 36 hours after application. Schirmer tear test (STT) was measured at 30 and 60 minute after treatment, then in same time points as IOP and HPD. Rebound tonometer (TonoVet®) was used to assess IOP, Jameson calliper to measure HPD and STT to determine the tear production.Results: 1% cyclopentolate increased ...
TURKISH JOURNAL OF VETERINARY AND ANIMAL SCIENCES
This study was conducted to investigate the effect of topical tacrolimus (0.1%) ointment in stimulating tear production in dogs with keratoconjunctivitis sicca (KCS). Thirty-six dogs (58 eyes) diagnosed with KCS were included in this study. KCS was grouped as early (E, n = 21 eyes), late (L, n = 21 eyes), and reflex tear due to corneal ulceration (R, n = 16 eyes) based on Schirmer tear test (STT) readings. The dogs in each group were randomly allotted treatment with either tacrolimus 0.1% ointment applied once daily (ET, n = 11 eyes; LT, n = 10 eyes; RT, n = 6 eyes) or cyclosporine (CsA) 0.05% eye drops instilled five times daily (EC, n = 10 eyes; LC, n = 11 eyes; RC, n = 10 eyes) for 2 months. The efficacy of the treatments was evaluated and comparison was made based on complete ophthalmic examination and a scoring system for various parameters like menace reflex, palpebral reflex, pupillary light reflex, conjunctival hyperemia, ocular discharge, corneal clarity, corneal ulceration, corneal vessel length, corneal vessel density, corneal pigmentation area, corneal pigmentation density, STT readings, fluorescein dye test, and Rose Bengal dye test. The effect of treatment was evaluated on day 15, 30, and 60 after treatments. Good quality digital photographs from a fixed distance were taken at each interval to aid subjective evaluation. Data were analyzed using one-way and repeated-measures ANOVA followed by Tukey's HSD test, Wilcoxon signed rank test, and Kruskal-Wallis test followed by Dunn's test to identify significant interactions. The level of significance was set to P < 0.05. Improvement in menace reflex and pupillary light reflex was observed in both treatment groups. Conjunctival hyperemia and ocular discharge decreased significantly after treatment with both of the drugs. There was no significant difference in improvement in tear production between treatment groups but tacrolimus 0.1% ointment significantly arrested the progression of pigments. The study concluded that both tacrolimus 0.1% ointment and CsA 0.05% eye drops improve tear production in KCS-affected dogs. Topical tacrolimus 0.1% ointment effectively arrests the progression of pigmentation compared to CsA 0.05% eye drops in KCS-affected dogs.
Journal of Feline Medicine and Surgery, 2018
Objectives This study aimed to investigate the effects of intramuscular medetomidine and xylazine on tear flow in healthy cats. Methods Five cats each received medetomidine 10, 20, 40 and 80 µg/kg IM; xylazine 1.0, 2.0, 4.0 and 8.0 mg/kg IM; and physiological saline (2.0 ml IM) in a randomised order separated by intervals of at least 1 week. The Schirmer tear test (STT) I was performed in both eyes before and 0.25, 0.5, 0.75, 1, 2, 3, 4, 5, 6, 7, 8 and 24 h after each dose. Results The STT I value decreased significantly at 0.5 and 1.0 h and at 0.75 and 1.0 h in both eyes after administration of medetomidine at 10 or 40 µg/kg. After administration of medetomidine 80 µg/kg, there was a significant decrease in the STT I reading at 0.75, 2 and 3 h in the left eye and 0.75, 1, 2 and 3 h in the right eye. The STT I value decreased significantly at: 0.5, 0.75, 1 and 2 h in the left eye and 0.75 h in the right eye after administration of xylazine 1.0 mg/kg; 0.5, 0.75, 1 and 2 h in the left...
Veterinary Ophthalmology, 2015
This study was performed to evaluate the effect of topical 1% cyclopentolate hydrochloride on tear production (STT), intraocular pressure (IOP), and vertical pupil diameter (VPD) in healthy Turkman horses. Forty eyes of 20 clinically normal horses were used for this study which randomly assigned to two groups. Prior to instillation of 1% cyclopentolate, the baseline STT, IOP and VPD of each group were recorded. Then, one drop of cyclopentolate was instilled randomly into one eye of each animal and the contralateral eye served as control. Measurements were repeated at 20 minss, 60 minss, 90 minss, 120 minss, 12 hrs, and 24 hrs, and every 24 hrs up to 120 hrs post drug instillation in all animals. There was no significant effect on STT over the time course measured in both the treated and untreated eyes of the treatment groups after unilateral instillation of 1% cyclopentolate when compared to baseline values. A significant increase in the IOP was observed after 20 mins, which persisted more than 90 minss; then, the IOP insignificantly decreased below the baseline values after 120mins. Maximum VPD was recognized at 12 hrs post instillation in treated eyes (15.8±2.3 mm) which was significantly different in comparison to the baseline (P=0.07). Cyclopentolate could be considered as a long term and potent cycloplegic drug in horses when taking into account the possible side effect of atropine.
American journal of veterinary research, 2016
OBJECTIVE To determine the temporal effects on tear flow measurements obtained by use of a Schirmer tear test (STT) I after IM administration of various doses of medetomidine or xylazine to healthy dogs. ANIMALS 5 healthy purpose-bred male Beagles. PROCEDURES Each dog received IM injections of 2.0 mL of physiologic saline (0.9% NaCl) solution (control treatment); 0.1% medetomidine hydrochloride (5, 10, 20, and 40 μg/kg), and 2.0% xylazine hydrochloride (0.5, 1.0, 2.0, and 4.0 mg/kg). Treatments were injected into the semimembranosus muscles; there was at least a 1-week interval between successive injections. Order of treatments was determined via a randomized Latin square crossover design. The STT I was performed on both eyes before (baseline) and 0.25, 0.50, 0.75, 1, 2, 3, 4, 5, 6, 7, 8, and 24 hours after each injection. RESULTS STT I values decreased significantly within 45 minutes after injection of medetomidine or xylazine, which was followed by gradual recovery. The lowest mea...
Veterinary Ophthalmology, 2006
Medetomidine is a commonly used sedative in veterinary medicine whether administered alone or in combination with an opioid such as butorphanol. There are no previous studies that look at the effects of this drug on sequential Schirmer tear test (STT) 1 readings in dogs, including effects on tear production after reversal of the drug. The present study looked at two groups of 10 dogs each that were sedated with intravenous medetomidine or a combination of medetomidine and butorphanol. All dogs had tear readings taken presedation, 15 min postsedation, and 15 min after reversal of medetomidine with atipamezole. Results revealed that intravenous sedation with medetomidine and medetomidine-butorphanol in dogs with no history of ophthalmic disease and presedation STT 1 readings above 15 mm/min, causes a significant decrease in tear production that is measurable at 15 min postsedation. Readings returned to near presedation values within 15 min postreversal in most cases. It is therefore recommended that all eyes be treated with a tear substitute from the time the sedative is given until at least 15 min after reversal.
Veterinary Sciences, 2021
Tear film provides lubrication and protection to the ocular surface. The sedation reduces tear production, often leading to perioperative exposure keratopathy. The aim of the present study was to report the effects of intramuscular dexmedetomidine on canine tear production, measured by STT-1, for an experimental period of 8 h after sedation. Ten dogs who underwent sedation for routine radiologic assessment were recruited for the study. In all animals, tear production in right and left eyes was measured 15 min before sedation (T0: basal values) and 20 min (T20), 1 h (T1), 2 h (T2), 4 h (T4) and 8 h (T8) after drug administration. Analysis of variance and post hoc Bonferroni test (p < 0.05) were performed. A significant effect of time on canine tear production was found. The tear production returned to basal values at T8. So, it is recommended to treat the canine eyes with tear substitutes during and up to 12 h after sedation.
Effects of short-term oral administration of propranolol on tear secretion in clinically normal dogs
The Canadian Veterinary Journal La Revue Veterinaire Canadienne, 2011
This study evaluated the effects of short-term oral administration of propranolol on tear secretion in 15 clinically normal crossbreed dogs. The treatment group (n = 8) received propranolol (2 mg/kg q8h) orally for 7 days. The control group (n = 7) received placebo during the study. Schirmer I tear tests were performed on both eyes 1 d prior to drug administration (T0), at 1 (T1), 3 (T3), and 7 (T7) days of treatment. Tear production in dogs, measured by STT, was not significantly reduced in both groups.
Objective To evaluate the effect of topical 2% dorzolamide alone, and in combination with topical 0.5% timolol, on intraocular pressure (IOP) in normal cats. Animals Twenty-four healthy Domestic Short-haired cats. Procedure Baseline values of IOP were established at 7 , 10 , 1 , 5 and 9 during pretreatment phase (days 1–2). During treatment phase (days 3–10) cats received 2% dorzolamide HCl q 12 h in group A (n = 6), q 8 h in group B (n = 6), and combined with 0.5% timolol maleate q 12 h in group C (n = 6). Cats in control group D (n = 6) received artificial tears q 8 h. During treatment phase IOP measurements were continued at the same time-points as in the pretreatment phase. Results Mean pretreatment IOP in all cats was 18.46 ± 2.99 mmHg. Mean IOP decreased significantly (P < 0.0086) in all treatment groups compared to pretreatment values (group A: 16.40 ± 0.49 mmHg, group B: 16.04 ± 0.49 mmHg, group C: 17.76 ± 0.49 mmHg). IOP did not decrease in control group D (18.55 ± 0.49 mmHg). The difference in IOP between treatment groups (A, B, C) was not statistically significant, but comparison of IOP between each treatment group and the control group was statistically significant (A–D; P = 0.0057; B–D, P = 0.0012; C–D, P = 0.0212). Conclusion Topical 2% dorzolamide significantly lowers IOP in normal cats but the effect is mild. Concomitant application of 2% dorzolamide and 0.5% timolol does significantly decrease IOP, but the effect is not significantly greater than q 8 h administration of dorzolamide alone.