Author/Editor		Prestor, B; Žgur, T; Dolenc, VV
Title		Subpially recorded cervical spinal cord evoked potentials in syringomyelia
Type		članek
Source		Electroencephalogr Clin Neurophysiol
Vol. and No.		Letnik 80
Publication year		1991
Volume		str. 155-8
Language		eng
Abstract		Intraoperative spinal cord evoked potentials (SCEPs) to median nerve stimulation were detected subpially from the dorsal surface of the cervical spinal cord in 5 patients with cervical syringomyelia and were compared to normal SCEPs obtained from the unaffected side in 6 patients during intraoperative monitoring of dorsal root entry zone lesion. Normal SCEP began with a positive deflection P9 and a complex N11/N13 with several low amplitude short potentials superimposed on the N11/N13. The complex was followed by a second negative potential N2 and a late prolonged positivity, P. In the 4 patients in whom median nerve somatosensory evoked potentials (SEPs) were present preoperatively, SCEP consisted of the N11 potential and the following low amplitude short (LAS) potentials, while the N13 wave was missing. In the fifth patient, in whom the preoperative median nerve SEP was missing, SCEPs were of much lower amplitude and shorter duration than normal. The potentials N2 and P were not recorded in any of our 5 patients. Changes in N13 wave, N2 and P potentials noted in syringomyelia were presumed to be the result of destruction of the spinal cord dorsal horn neurons caused by spinal cord central cavitation.
Descriptors		SYRINGOMYELIA EVOKED POTENTIALS, SOMATOSENSORY PIA MATER SPINAL CORD CERVICAL VERTEBRAE ELECTRIC STIMULATION ELECTROENCEPHALOGRAPHY MEDIAN NERVE ADULT MIDDLE AGE REACTION TIME