A method of assessing auditory and brainstem function in horses.
Abstract: Brainstem auditory evoked potential (BAEP) waveforms were recorded as a means of objectively evaluating auditory and brainstem function in horses. BAEP recordings were readily and repeatably recorded from horses, under minimal restraint, using signal averaging equipment. Clearly identified BAEP waveforms were obtained with compression clicks of 30-100 dB (HHL) at 10 Hz applied in the external auditory meatus of one ear and masking white noise (10 dB lower) in the other ear. Vertex positive (upwards) waveforms I through V were obtained with an active, subdermal electrode over the ipsilateral and contralateral zygomatic processes of the temporal bones and the reference electrode over the vertex. Recording sweep duration was 10 ms, amplifier sensitivity 10 microV/division, display gain x 10 and low and high amplifier filters set at 200 Hz to 2 kHz. Such recordings can be useful in evaluation of all clinical cases suspected of showing degrees of deafness, vestibular disease or brainstem disease, and in monitoring the progress of such cases.
Publication Date: 1990-11-01 PubMed ID: 2271908DOI: 10.1016/0007-1935(90)90054-7Google Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
- Brain
- Clinical Findings
- Clinical Pathology
- Clinical Study
- Diagnosis
- Diagnostic Technique
- Disease Diagnosis
- Disease Treatment
- Equine Diseases
- Equine Health
- Equine Science
- Horses
- Nerves
- Neurological Diseases
- Veterinary Care
- Veterinary Medicine
- Veterinary Practice
- Veterinary Procedure
- Veterinary Research
- Veterinary Science
Summary
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This study presents a method for objectively assessing auditory and brainstem function in horses using brainstem auditory evoked potential (BAEP) waveforms.
Research Summary
For this study, BAEP waveforms were recorded to evaluate auditory and brainstem function in horses. The recordings were done under minimal restraint, suggesting that the procedure doesn’t distress or greatly discomfort the animals. Moreover, recordings were repeatable, implying this method could be used over time or in different sessions for ongoing monitoring or to track the progress of a condition.
Method Used
- BAEP waveforms were captured using signal averaging equipment.
- The horses were exposed to compression clicks of 30-100 dB applied in one ear while masking white noise was used in the other ear, aside at 10 dB lower, to ensure the recordings were focused on the auditory response from the clicks, rather than background noise.
- The procedure used an active, subdermal electrode positioned over the ipsilateral and contralateral zygomatic processes of the temporal bones, with the reference electrode located over the vertex.
- Recording parameters were set with a sweep duration of 10 ms, amplifier sensitivity of 10 microV/division, display gain of x 10, and amplifier filters ranged from 200 Hz to 2 kHz.
Potential Applications
- This method of BAEP waveform recording could be useful in diagnosing and assessing the extent of potential hearing loss, vestibular disease or brainstem disease in horses.
- It might also be employed in monitoring the progress of these conditions over time or in response to treatment interventions.
This research provides an innovative approach to assessing auditory and brainstem functions in horses, addressing a key area in veterinary neurology. It lays a foundation for more precise and objective diagnostics and evaluations in these specific areas of equine health.
Cite This Article
APA
Mayhew IG, Washbourne JR.
(1990).
A method of assessing auditory and brainstem function in horses.
Br Vet J, 146(6), 509-518.
https://doi.org/10.1016/0007-1935(90)90054-7 Publication
Researcher Affiliations
- Department of Clinical Studies, Animal Health Trust, Newmarket, Suffolk.
MeSH Terms
- Animals
- Audiometry, Evoked Response / veterinary
- Electrodes / veterinary
- Evoked Potentials, Auditory, Brain Stem
- Horses / physiology
Citations
This article has been cited 6 times.- Harris C, White PJ, Mohler VL, Lomax S. Electroencephalography Can Distinguish between Pain and Anaesthetic Intervention in Conscious Lambs Undergoing Castration. Animals (Basel) 2020 Mar 4;10(3).
- McIlhone AE, Beausoleil NJ, Kells NJ, Johnson CB, Mellor DJ. Effects of halothane on the electroencephalogram of the chicken. Vet Med Sci 2018 May;4(2):98-105.
- McIlhone AE, Beausoleil NJ, Kells NJ, Mellor DJ, Johnson CB. Effects of noxious stimuli on the electroencephalogram of anaesthetised chickens (Gallus gallus domesticus). PLoS One 2018;13(4):e0196454.
- Tünsmeyer J, Hopster K, Kästner SB. Clinical Use of a Multivariate Electroencephalogram (Narcotrend) for Assessment of Anesthetic Depth in Horses during Isoflurane-Xylazine Anesthesia. Front Vet Sci 2016;3:25.
- Lecoq L, Gains M, Blond L, Parent J. Brainstem auditory evoked responses in foals: reference values, effect of age, rate of acoustic stimulation, and neurologic deficits. J Vet Intern Med 2015 Jan;29(1):362-7.
- Aleman M, Holliday TA, Nieto JE, Williams DC. Brainstem auditory evoked responses in an equine patient population: part I--adult horses. J Vet Intern Med 2014 Jul-Aug;28(4):1310-7.
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