Author/Editor		Prestor, B; Žgur, T; Dolenc, VV
Title		Epidural and subpial cortico-spinal potentials evoked by transcutaneous motor cortex stimulation during spinal cord surgery
Type		članek
Source		In: Rossini PM, Mauguiere F, eds. New trends and advanced techniques in clinical neurophysiology. Elsevier science publishers,
Vol. and No.		, št. Suppl 41
Publication year		1990
Volume		str. 348-51
Language		eng
Abstract		Cortico-spinal potentials (CSPs) to transcutaneous motor cortex stimulation were recorded epidurally and subpially in 8 patients undergoittg spinal cord surgery. In 6 patients without cortico-spinal tract involvement, a CSP consisted of a direct (D) wave, which was followed by indirect (I) waves at a higher stimulus intensity. The D wave appearcd at 25-50 per cent of the maximum stimulus intensity. With increasing stimulus its amplitude levelled off betwcen 10 and 30 micro V when recorded epidurally. At high stimulus a prominent indirect potential (I' wave) appeared which followed the D wave after 2.2-3.6 msec. lite D and I' wave conduction velocities calculated in 3 cascs werc idcntical - 65, 70 and 80 m/sec. Subpial records had largcr amplitudes than epidural ones but were of the same configuration. In 2 patients with spastic paraparesis the CSP changes were detected below the site of the cord lesion.
Descriptors		MOTOR CORTEX PYRAMIDAL TRACTS SPINAL CORD SPINAL CORD DISEASES EVOKED POTENTIALS TRANSCUTANEOUS ELECTRIC NERVE STIMULATION ADOLESCENCE ADULT ELECTRIC STIMULATION ELECTROENCEPHALOGRAPHY EPIDURAL SPACE PIA MATER REACTION TIME SPINAL CORD SPINAL CORD DISEASES