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A method of assessing auditory and brainstem function in horses.

I G Mayhew1, J R Washbourne

  • 1Department of Clinical Studies, Animal Health Trust, Newmarket, Suffolk.

The British Veterinary Journal
|November 1, 1990
PubMed
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Brainstem auditory evoked potential (BAEP) tests objectively evaluate auditory and brainstem function in horses. These repeatable BAEP recordings aid in diagnosing deafness, vestibular, or brainstem disorders.

Area of Science:

  • Veterinary Neurology
  • Neurophysiology

Background:

  • Objective assessment of auditory and brainstem function in horses is crucial for diagnosing neurological disorders.
  • Traditional methods may be invasive or subjective, necessitating reliable electrophysiological techniques.

Purpose of the Study:

  • To establish and validate the use of Brainstem Auditory Evoked Potential (BAEP) recordings for objective evaluation of auditory and brainstem function in horses.
  • To demonstrate the utility of BAEP in clinical settings for diagnosing and monitoring neurological conditions.

Main Methods:

  • BAEP waveforms were recorded from horses under minimal restraint using signal averaging equipment.
  • Stimuli included compression clicks (30-100 dB HL) in one ear and masking white noise in the other.
  • Electrodes were placed subdermally over the zygomatic processes and vertex, with a 10 ms sweep duration and specific filter settings.

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Main Results:

  • BAEP recordings were readily and repeatably obtained in horses.
  • Clearly identifiable vertex positive waveforms (I-V) were consistently observed.
  • The technique proved reliable for assessing auditory pathway integrity.

Conclusions:

  • BAEP is a valuable, objective tool for evaluating auditory and brainstem function in horses.
  • These recordings can aid in the diagnosis and monitoring of deafness, vestibular disease, and brainstem disorders in equine patients.