A method of assessing auditory and brainstem function in horses.

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.