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Brain stem auditory-evoked responses in the dog.

R D Bodenhamer, J F Hunter, P J Luttgen

    American Journal of Veterinary Research
    |August 1, 1985
    PubMed
    Summary

    Brain stem auditory-evoked responses (BAER) in dogs provide a baseline for hearing assessment. Factors like stimulus intensity and body temperature significantly influence these auditory brainstem responses.

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    Area of Science:

    • Veterinary Neuroscience
    • Auditory Physiology
    • Neurodiagnostics

    Background:

    • Brain stem auditory-evoked responses (BAER) are crucial for evaluating auditory pathway function.
    • Establishing normative BAER data in healthy dogs is essential for accurate clinical interpretation.
    • Understanding factors influencing BAER is vital for reliable diagnostic assessments in canine patients.

    Purpose of the Study:

    • To establish baseline Brain stem auditory-evoked responses (BAER) values in a cohort of healthy dogs.
    • To investigate the influence of nonpathologic factors, such as stimulus intensity and body temperature, on BAER.
    • To provide normative data for canine BAER to aid in the diagnosis of hearing deficits.

    Main Methods:

    • Recorded BAER from 58 dogs with no known history of hearing impairment.
    • Utilized acoustic clicks at 60-dB hearing level to elicit responses.
    • Measured peak latencies and amplitudes, and analyzed the effects of stimulus intensity and body temperature.

    Main Results:

    • Normal BAER waveforms consisted of 4-5 peaks with a mean amplitude of approximately 3.0 microV.
    • Peak latencies were recorded, with Peak V latency at 5.55 +/- 0.37 ms at 60-dB HL.
    • Decreased stimulus intensity and lower body temperature led to increased peak latencies and reduced amplitudes.

    Conclusions:

    • The study provides normative BAER data for healthy dogs.
    • Stimulus intensity and body temperature are significant nonpathologic factors affecting canine BAER.
    • These findings are critical for the accurate interpretation of BAER tests in veterinary neurology and audiology.

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