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Delayed auditory brainstem responses in diabetes mellitus

M W Donald, C E Bird, J S Lawson

    Journal of Neurology, Neurosurgery, and Psychiatry
    |July 1, 1981
    PubMed
    Summary

    Diabetic patients show delayed auditory brainstem responses, indicating a central neuropathy. This auditory pathway delay is independent of hearing loss or blood sugar levels.

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    Area of Science:

    • Neuroscience
    • Diabetology
    • Audiology

    Background:

    • Diabetes mellitus is a systemic disease with potential neurological complications.
    • Auditory pathway integrity can be affected by metabolic and vascular changes associated with diabetes.

    Purpose of the Study:

    • To investigate brainstem auditory evoked responses (BAERs) in diabetic patients compared to controls.
    • To determine if delays in BAERs correlate with clinical hearing loss or glycemic control.
    • To localize the site of auditory pathway dysfunction in diabetes.

    Main Methods:

    • Brainstem auditory evoked responses (BAERs) were recorded in diabetic patients and age-matched healthy controls.
    • Interpeak latencies of BAER waves (I-V) were analyzed.
    • Correlation analysis was performed between BAER latencies, audiometric thresholds, and blood glucose levels.

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    Main Results:

    • Diabetic patients exhibited significantly longer interpeak latencies between waves II and V of the BAERs compared to controls.
    • No significant differences were found in waves I and II latencies between groups.
    • The observed delays in BAERs did not correlate with the degree of clinical hearing loss or current blood glucose levels.

    Conclusions:

    • The findings suggest a central auditory neuropathy in diabetic patients, affecting brainstem and midbrain auditory processing.
    • The eighth cranial nerve's conduction velocity is likely preserved.
    • Diabetes-related central neuropathy impacts auditory signal transmission beyond the peripheral auditory nerve.