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Brain stem auditory evoked response and brain stem compression

A R MacKay, Y Hosobuchi, J S Williston

    Neurosurgery
    |June 1, 1980
    PubMed
    Summary
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    Brain stem auditory evoked response (BAER) changes reliably indicate expanding posterior fossa masses before critical Cushing responses. Monitoring BAER may aid in managing these critical neurological conditions.

    Area of Science:

    • Neurology
    • Neuroscience
    • Otolaryngology

    Background:

    • Expanding mass lesions in the posterior fossa can lead to critical increases in intracranial pressure.
    • Early detection of neurological compromise is vital for effective patient management.

    Purpose of the Study:

    • To investigate the utility of brain stem auditory evoked response (BAER) in detecting early intracranial pressure changes caused by expanding posterior fossa lesions.
    • To compare the timing of BAER alterations with the Cushing response.

    Main Methods:

    • Anesthetized cats underwent slow inflation of posterior fossa balloon catheters.
    • Supratentorial and infratentorial intracranial pressure and vital signs were continuously monitored.
    • Brain stem auditory evoked responses were recorded serially.

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    Main Results:

    • Reliable changes in BAER were observed preceding the development of the Cushing response.
    • These BAER alterations were reversible upon deflation of the balloon catheter.

    Conclusions:

    • Brain stem auditory evoked response changes serve as an early indicator of neurological compromise due to expanding posterior fossa masses.
    • Serial BAER monitoring could be a valuable tool in managing patients with suspected or known posterior fossa lesions.