SHORT-LATENCY MEDIAN NERVE SOMATOSENSORY-EVOKED POTENTIAL (SEP) - INCREASE in STIMULATION FREQUENCY FROM 3 TO 30 HZ

SHORT-LATENCY MEDIAN NERVE SOMATOSENSORY-EVOKED POTENTIAL (SEP) - INCREASE in STIMULATION FREQUENCY FROM 3 TO 30 HZ

Author Manzano, G. M. Google Scholar
Denavarro, J. M. Google Scholar
Nobrega, JAM Google Scholar
Novo, N. F. Google Scholar
Juliano, Y. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract Somatosensory evoked potentials were obtained by electrical stimulation of the median nerve in 10 normal subjects at 3 and 30 Hz. At the higher rate of stimulation, a reduction was observed in amplitudes and prolongation of latencies of the N9,N/P13 and N20 components as well as increase of the interpeak latency N9-N/P13. A significant increase between the onsets of the N11 and N20 components was also seen; however, no significant increase of the N/P13-N20 interpeak latency was observed. Analysis suggested that an important reason for this last finding was related to the fact that in some cases different fast frequency components (FFC) determined the N20 peak in the different situations. It was further observed that, in those cases in which at least 3 peaks in the fast frequency components were detected (7/10), a significantly different increase in latency between the first and the third peaks was noted. A possible thalamo-cortical generation of the FFC is discussed.
Keywords SOMATOSENSORY EVOKED POTENTIALS
MEDIAN NERVE
CENTRAL CONDUCTION TIME
STIMULATION FREQUENCY
FAST FREQUENCY COMPONENTS
Language English
Date 1995-05-01
Published in Evoked Potentials-electroencephalography and Clinical Neurophysiology. Clare: Elsevier Sci Publ Ireland Ltd, v. 96, n. 3, p. 229-235, 1995.
ISSN 0168-5597 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 229-235
Origin http://dx.doi.org/10.1016/0168-5597(94)00271-F
Access rights Closed access
Type Article
Web of Science ID WOS:A1995QZ16100004
URI http://repositorio.unifesp.br/handle/11600/25491

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