Measurement of intraocular pressure in healthy anesthetized horses during hoisting

Monk, Caroline S.; Brooks, Dennis; Granone, Tiffany D.; Garcia‐Pereira, Fernando; Melesko, Alexander; Plummer, Caryn E.

doi:10.1016/j.vaa.2016.10.001

Cited by 6 publications

(17 citation statements)

References 27 publications

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“…The reference range for horses using tonometry is reported as 15-37 mmHg (Komáromy et al, 2006;Monk et al, 2017). Several factors such as the time of day, sedation, anesthetic agents and head position influence the IOP (Hall et al, 2000;Stine et al, 2014;Arıcan et al, 2015;Monk et al, 2017). In the present study, there were no statistical differences seen in IOP values at the 0th, 5th, 15th, 30th and 60th minutes of anaesthesia between and within groups.…”

Section: Discussionmentioning

confidence: 43%

“…The effects of sevoflurane on CNS are lower than isoflurane and compared to other inhalation anesthetics the suppression effect is greater at increasing doses. Sevoflurane reduces systemic vascular resistance, arterial blood pressure and mean pulmonary arterial pressure during IOP; intraocular pressure, Reference; Komáromy et al, 2006;Monk et al, 2017 In general anaesthesia, anaerobic metabolism begins to produce lactate due to decreased perfusion in tissues and an increase in the amount of lactate during anaesthesia. Along with anaerobic metabolism Glu levels increase due to sympathetic stimulation and lipolysis (Edner et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…The IOP measurement is part of the routine eye examination in horses with tonometry and has become more widely used in recent years. The reference range for horses using tonometry is reported as 15-37 mmHg (Komáromy et al, 2006;Monk et al, 2017). Several factors such as the time of day, sedation, anesthetic agents and head position influence the IOP (Hall et al, 2000;Stine et al, 2014;Arıcan et al, 2015;Monk et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Intraocular pressure (IOP) is defined as the equilibrium between production and drainage of humor aqueous in the ciliary processes of the eye. The anaesthetic agents may cause changes in IOP (Komáromy et al, 2006;Monk et al, 2017). The aim of this study was to investigate the effects of xylazine, detomidine, isoflurane and sevoflurane anesthetic combinations on clinical, laboratory, and cardiovascular parameters as well as their effects on IOP in horses.…”

Section: Introductionmentioning

confidence: 99%

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The investigation of xylazine, detomidine, isoflurane and sevoflurane anaesthetic combinations on clinical, laboratory and cardiovascular parameters and on intraocular pressure in horses

Erol

Arican

2019

J Hellenic Vet Med Soc

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The aim of this study was to investigate the effects of anaesthetic combinations of xylazine, detomidine, sevoflurane and isoflurane on clinical, laboratory, and cardiovascular parameters as well as their effects on intraocular pressure in horses. Twenty-four mixed-breed horses (twelve male and twelve female) were used for this study. The horses were allocated into four groups (six horses in each group): XS (xylazine-sevoflurane), XI (xylazine-isoflurane), DS (detomidine-sevoflurane) and DI (detomidine-isoflurane). Clinical evaluations, hematological, biochemical tests and measurement of intraocular pressure were done before (0th), during (5th, 15th and 30th min) and at the end of anaesthesia (60th min). The detected differences were statistically evaluated. In conclusion, this study shows that the anaesthetic combinations of sevoflurane and isoflurane with xylazine and detomidine provided safe and suitable anaesthesia in horses. Our study did not reveal any statistical differences in intraocular pressure measurements. However, it should be noted that intraocular pressures were measured with the animals lying down and our results do not rule out changes in intraocular pressures in a standing position. We concluded that these anaesthesia protocols are suitable for ophthalmic surgery.

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Section: Discussionmentioning

confidence: 43%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The investigation of xylazine, detomidine, isoflurane and sevoflurane anaesthetic combinations on clinical, laboratory and cardiovascular parameters and on intraocular pressure in horses

Erol

Arican

2019

J Hellenic Vet Med Soc

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“…There are multiple possible deleterious consequences of fluctuations in IOP that threaten vision and viability of the globe. In patients with deep ulceration, laceration, or penetrating foreign bodies, IOP changes may provoke corneal perforation and globe rupture, 9 which has been associated with poor prognoses for vision and ocular survival in this species 10 . Management of IOP is therefore critical for anesthetized veterinary patients with ocular disease when a fragile globe may be susceptible to large changes in IOP.…”

Section: Introductionmentioning

confidence: 99%

Effect of multiple head positions on intraocular pressure in healthy, anesthetized horses during hoisting

Alling

Cremer

Liu

et al. 2020

Veterinary Ophthalmology

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Objective To evaluate changes in intraocular pressure (IOP) with variable head position in healthy, anesthetized horses in hoisted inversion and to assess the influence of various cofactors (age, sex, body weight, body condition score, and neck length) on IOP changes during hoisting. Animals studied Seventeen healthy adult horses without significant ocular abnormalities. Procedures Subjects were administered intravenous xylazine/butorphanol premedication and ketamine/midazolam induction with xylazine/ketamine boluses for anesthetic maintenance. While hoisted, IOP was measured in triplicate for each eye via rebound tonometry (TonoVet) at neutral head position (ie, eyes level with the withers), at multiple 5 cm increments above and below neutral (−20 cm through +20 cm) using foam pads for head support, and with eyes above heart level via manual support. Results In hoisted positions, IOP ranged from 18 to 51 mmHg. Intraocular pressure significantly decreased with head position elevated ≥+15 cm from neutral and significantly increased when lowered ≤−5 cm from neutral. Neck length significantly influenced IOP (P = .0328) with linear regression indicating a median (range) increase of 0.244 (0.034‐0.425) mmHg in IOP for every 1 cm increase in neck length. Age, sex, breed, body weight, body condition score, and eye (OD vs OS) did not significantly influence IOP. Intraocular pressure only varied significantly between eyes at +10 cm above neutral (OS > OD, 1.7 ± 0.6 mm Hg, P = .0044). Conclusions Intraocular pressure in healthy, anesthetized horses varies with head position during hoisting; increased neck length may be associated with larger changes in IOP during hoisting.

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Anesthetic Management for Ocular Interventions

Martins¹,

Martin‐Flores²

2022

Equine Anesthesia and Co‐Existing Disease

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Measurement of intraocular pressure in healthy anesthetized horses during hoisting

Cited by 6 publications

References 27 publications

The investigation of xylazine, detomidine, isoflurane and sevoflurane anaesthetic combinations on clinical, laboratory and cardiovascular parameters and on intraocular pressure in horses

The investigation of xylazine, detomidine, isoflurane and sevoflurane anaesthetic combinations on clinical, laboratory and cardiovascular parameters and on intraocular pressure in horses

Effect of multiple head positions on intraocular pressure in healthy, anesthetized horses during hoisting

Anesthetic Management for Ocular Interventions

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