Functional deficits of central sensory and motor pathways in patients with cervical spinal stenosis: a study of SEPs and EMG responses to non-invasive brain stimulation.

Electroencephalography and Clinical Neurophysiology
H MasurA C Ludolph

Abstract

The central conduction time of the descending and ascending fibers of the spinal cord were examined in patients with radiologically defined cervical spinal stenosis (antero-posterior diameter of the spinal canal less than 13 mm). Nineteen patients were examined, only 4 of whom showed clinical signs of spastic weakness or ataxia. The electromyographic response after non-invasive stimulation of the leg area of the motor cortex was delayed in 13 of the 15 clinically unaffected patients. The central latency (N21-P39) of the somatosensory evoked response after stimulation of the tibial nerve (tibialis SEP) was increased in 12 of the 15 individuals. The 4 patients with clinical signs showed abnormal latencies with both methods. The use of both techniques for the examination of the function of the spinal cord revealed increased latencies in the central motor and/or sensory pathways in all patients. The technique of non-invasive stimulation of the corticospinal system therefore provides an additional tool to detect and quantify subclinical and clinically apparent lesions in patients with defined cervical spinal stenosis.

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Citations

Oct 1, 1992·Electroencephalography and Clinical Neurophysiology·H MasurG G Brune
Sep 1, 1995·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·K C Hayes, D L Wolfe
Dec 19, 2000·Pediatric Neurology·Y NoguchiK Harada
Jan 1, 1992·Journal of Neurology, Neurosurgery, and Psychiatry·B BrouwerP Ashby
May 1, 1995·Italian Journal of Neurological Sciences·M De MatteiE Morgando
Jun 1, 1991·Electroencephalography and Clinical Neurophysiology·A EisenD Calne
Nov 1, 1994·Acta Neurologica Scandinavica·D Linden, P Berlit
Mar 10, 1999·Brain : a Journal of Neurology·M R MagistrisC W Hess

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