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Brainstem auditory evoked potentials in postconcussion syndrome

P Benna, B Bergamasco, C Bianco

    Italian Journal of Neurological Sciences
    |December 1, 1982
    PubMed
    Summary
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    Brainstem auditory evoked potentials (BAEPs) reveal objective evidence of reversible brainstem dysfunction in postconcussion syndrome (PCS) patients. Many patients showed abnormal BAEPs, which improved over time, indicating potential for recovery.

    Area of Science:

    • Neuroscience
    • Audiology
    • Neurology

    Background:

    • Postconcussion syndrome (PCS) can involve subclinical brainstem dysfunction.
    • Objective diagnostic tools are needed to assess brainstem involvement in PCS.

    Purpose of the Study:

    • To investigate brainstem auditory evoked potentials (BAEPs) for objective evidence of brainstem disorders in PCS patients.
    • To determine the reversibility of BAEP alterations in PCS.

    Main Methods:

    • BAEPs were recorded from 55 patients diagnosed with PCS.
    • Abnormal responses were identified based on prolonged interpeak latencies exceeding 99% confidence limits.
    • A subset of patients (14) were re-tested to assess response changes over time.

    Main Results:

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    • Fifteen patients (27.3%) exhibited abnormal BAEP responses (unilateral or bilateral).
    • Nine additional patients had borderline BAEP responses.
    • BAEP alterations did not correlate with dizziness or routine caloric test results.
    • A majority of re-tested patients showed improvement in BAEP responses over time.

    Conclusions:

    • BAEPs can provide objective evidence of brainstem dysfunction in PCS patients.
    • The observed improvements suggest that brainstem disorders associated with PCS may be reversible.
    • BAEPs may serve as a valuable tool for monitoring recovery in PCS.