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Spinal evoked potential in the monkey.

M H Feldman, R Q Cracco, P Farmer

    Annals of Neurology
    |March 1, 1980
    PubMed
    Summary

    Computer-averaged evoked potentials (EPs) reveal distinct patterns in monkey spinal cords, showing how nerve signals propagate and are affected by lesions and asphyxia.

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    Area of Science:

    • Neuroscience
    • Spinal Cord Physiology
    • Evoked Potentials

    Background:

    • Evoked potentials (EPs) are crucial for assessing neural pathway integrity.
    • Understanding EPs in the context of spinal cord lesions and physiological stress is vital for clinical applications.

    Purpose of the Study:

    • To characterize computer-averaged evoked potential responses (EPs) following sciatic nerve and cervical spinal cord stimulation in monkeys.
    • To investigate the impact of chronic spinal cord lesions and asphyxia on these EPs.

    Main Methods:

    • Recorded EPs from dura and skin over the cauda equina and spinal cord in seven monkeys.
    • Utilized sciatic nerve and cervical spinal cord stimulation.
    • Introduced chronic spinal cord lesions and controlled asphyxia in some subjects.

    Main Results:

    • Sciatic EPs showed predominantly negative triphasic propagated potentials, greatest over the cauda equina and caudal spinal cord.
    • Conduction velocity varied along spinal cord segments.
    • EPs exhibited differential sensitivity to asphyxia and stimulation rates, with some potentials being abolished or attenuated.
    • Spinal cord transection resulted in nonpropagated EPs rostral to the lesion.
    • Partial hemisection led to increased latency, reduced amplitude, and poor definition of ipsilateral sciatic EPs.

    Conclusions:

    • EPs provide valuable insights into spinal cord function and the effects of injury.
    • Propagated and nonpropagated potentials exhibit distinct characteristics and sensitivities.
    • EP analysis can detect functional deficits caused by spinal cord lesions.

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