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Auditory brain stem response testing in anesthetized horses.

S L Rolf, S M Reed, W Melnick

    American Journal of Veterinary Research
    |June 1, 1987
    PubMed
    Summary
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    Auditory brain stem response (ABR) testing in horses reveals that higher sound intensity reduces wave latencies. This ABR analysis provides insights into equine auditory function under anesthesia.

    Area of Science:

    • Veterinary Neurology
    • Auditory Neuroscience
    • Equine Physiology

    Background:

    • Auditory brain stem response (ABR) is a non-invasive electrophysiological test to assess the auditory pathway.
    • Understanding ABR characteristics in horses is crucial for diagnosing hearing impairments and neurological conditions.

    Purpose of the Study:

    • To characterize the auditory brain stem response in healthy horses under general anesthesia.
    • To investigate the effect of varying sound intensity on ABR wave latencies in equine subjects.

    Main Methods:

    • Ten healthy horses underwent ABR testing using insert earphones and click stimuli of alternating polarity at 25 clicks/s.
    • Waveforms (I-V) were identified, and peak latencies were measured across a range of sound pressure levels (SPL) from 87 to 136 dB.

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  • Least-squares regression analysis was performed to determine the relationship between stimulus intensity and wave latencies.

    • Main Results:

    • All five ABR waves (I-V) were consistently identified.
    • Wave latencies significantly decreased with increasing stimulus intensity (P < 0.05 for waves I-IV).
    • Latency decrease ranged from 0.13 to 0.004 ms/dB; waves became unrecognizable below 87 dB SPL.

    Conclusions:

    • Auditory brain stem response testing is feasible and informative in anesthetized horses.
    • Increasing sound intensity significantly reduces ABR wave latencies in horses, indicating a dose-dependent auditory pathway response.
    • These findings establish normative latency data and highlight the impact of intensity on ABR measures in equine auditory assessment.