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  • Title: Diagnostic value of cervical somatosensory evoked potentials recorded from the intervertebral discs after median and ulnar nerve stimulation in cervical spondylotic myelopathy.
    Author: Ueta E, Tani T, Taniguchi S, Ishida K, Ushida T, Yamamoto H.
    Journal: J Spinal Disord; 1998 Dec; 11(6):514-20. PubMed ID: 9884297.
    Abstract:
    We have studied the cervical somatosensory evoked potentials (CSEPs) recorded referentially from serial intervertebral discs after stimulation of the median nerve or the ulnar nerve at the wrist in cervical spondylosis. In seven unilateral radiculopathies, the CSEPs evoked by stimulation on the asymptomatic side normally consisted of the P1-N1 and the P2-N2 components, which represented the potentials arising from the white matter and the gray matter, respectively. Of 21 myelopathies, the CSEPs revealed the white matter involvement with conduction block identified by abrupt P1-N1 amplitude reduction in 7, the gray matter involvement identified by P2-N2 amplitude reduction in 3, or a combination of both in 11. The CSEPs were useful not only for determining the level responsible for myelopathy but also for localizing the lesion in the transverse plane of the spinal cord.
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