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Evoked potential changes during brain retraction in dogs

M H Bennett, M S Albin, L Bunegin

    Stroke
    |July 1, 1977
    PubMed
    Summary
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    Brain retraction and hypotension can reduce cerebral blood flow. Monitoring cortical evoked potentials reliably indicates functional brain changes during neurosurgery, predicting patient outcomes.

    Area of Science:

    • Neurosurgery
    • Neurophysiology

    Background:

    • Brain retraction and induced hypotension are surgical techniques that can impair cerebral blood flow.
    • Understanding their impact on brain function is crucial for patient safety.

    Purpose of the Study:

    • To evaluate the effects of brain retraction and induced hypotension on brain function.
    • To determine the reliability of cortical evoked potentials as an indicator of brain compromise.

    Main Methods:

    • Assessed cortical evoked potentials, neurological status, and histological changes in dogs.
    • Varied levels of brain retractor pressure and systemic perfusion pressure.

    Main Results:

    • Cortical evoked potentials decreased with increased retraction pressure and reduced perfusion pressure.

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  • A 50% reduction in evoked potential amplitude after 60 minutes predicted postoperative deficits and pathology.

    • Conclusions:

    • Cortical evoked potentials are reliable indicators of functional effects from brain retraction under varying perfusion pressures.
    • Evoked potential monitoring is valuable during neurosurgical procedures involving hypotension and retraction.