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Evoked potentials in experimental myelopathy.

S J Larson, P R Walsh, A Sances

    Spine
    |July 1, 1980
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    Somatosensory evoked potentials reliably detect spinal cord dysfunction from mechanical or vascular insults. Spinal cord responses persist longer than cerebral responses during aortic occlusion.

    Area of Science:

    • Neuroscience
    • Spinal Cord Physiology
    • Surgical Monitoring

    Background:

    • Evoked potentials (EPs) reflect the functional integrity of neural pathways.
    • Spinal cord dysfunction can occur during surgical procedures.
    • Distinguishing mechanical from vascular insults to the spinal cord is clinically important.

    Purpose of the Study:

    • To investigate the effect of vertebral column distraction and flexion on EPs.
    • To assess the impact of aortic occlusion on cerebral and spinal cord EPs.
    • To evaluate the utility of EPs in detecting spinal cord dysfunction during surgery.

    Main Methods:

    • Recorded somatosensory evoked potentials (SEPs) from the cerebral cortex and spinal cord.
    • Applied peripheral stimulation and induced vertebral column distraction and flexion.

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  • Induced aortic occlusion and observed changes in EP amplitudes over time.

    • Main Results:

    • Both vertebral distraction and flexion reversibly reduced EP amplitudes.
    • Cerebral EPs were lost within 2 minutes of aortic occlusion; spinal cord EPs persisted for ~10 minutes.
    • Early changes in EPs during aortic occlusion were similar for mechanical and vascular insults.

    Conclusions:

    • Somatosensory evoked potential recordings are a reliable method for detecting spinal cord dysfunction.
    • EPs can potentially differentiate between mechanical and vascular spinal cord insults based on response latency.
    • SEP monitoring may enhance surgical safety for procedures involving the spinal cord.