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Brainstem auditory evoked potentials in postconcussion dizziness

M J Rowe, C Carlson

    Archives of Neurology
    |November 1, 1980
    PubMed
    Summary
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    Minor head or neck injuries can cause brainstem dysfunction, even with normal clinical exams. Brainstem auditory evoked potential studies revealed prolonged latencies in patients with postconcussion dizziness, indicating objective neurological changes.

    Area of Science:

    • Neurology
    • Audiology
    • Neuroscience

    Background:

    • Postconcussion syndrome often presents with subjective symptoms like dizziness.
    • Minor head or neck injuries are frequently underestimated in their potential for neurological sequelae.
    • Objective diagnostic tools are needed to confirm neurological dysfunction in concussion patients.

    Purpose of the Study:

    • To investigate objective brainstem dysfunction in patients with postconcussion dizziness.
    • To correlate subjective symptoms with electrophysiological findings following minor head or neck trauma.

    Main Methods:

    • Brainstem Auditory Evoked Potential (BAEP) studies were performed on 27 patients.
    • Patients experienced dizziness after minor head or neck injury.
    • BAEPs were analyzed for interpeak latencies, comparing them to normal control limits.

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    Main Results:

    • Three patients showed prolonged interpeak latencies beyond the 99% tolerance limit.
    • Group mean interpeak latencies (1-3, 2-3, and 1-5) were significantly prolonged.
    • Clinical examinations at the time of study were normal for all patients.

    Conclusions:

    • Minor head or neck injuries can lead to objectively demonstrable brainstem dysfunction.
    • BAEP studies can reveal subclinical neurological deficits in postconcussion dizziness.
    • Electrophysiological testing is valuable for diagnosing brainstem dysfunction after trauma.