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  • Title: Somatosensory cerebral potentials evoked by stimulation of the lumbo-sacral spinal cord in normal subjects and in patients with conus medullaris and cauda equina lesions.
    Author: Ertekin C, Sarica Y, Uçkardeşler L.
    Journal: Electroencephalogr Clin Neurophysiol; 1984 Feb; 59(1):57-66. PubMed ID: 6198165.
    Abstract:
    Somatosensory cerebral evoked potentials were recorded by intrathecal stimulation of the lumbo-sacral cord and roots in 16 normal subjects and patients having cauda/conus injury (group A, 15 cases), compressive lesions of cauda equina (group B, 13 cases) and lesions of both types covering the lumbar cord (group C, 24 cases). The shape of the intrathecally evoked cerebral potential (IECP) was basically the same as that obtained by posterior tibial nerve stimulation from 12 normal subjects except that the early components were 10-15 msec shorter in latency in the former potential, with an average of 12 msec. IECPs were easily recorded in groups A and B, but a significant delay was found in both groups, especially group A. It was difficult to obtain the IECP in group C, When it could be recorded the latency increase was apparent. These findings were explained on the basis of degeneration of the ascending spinal nerve fibers proximal to the lesion site.
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