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Somatosensory evoked potential from S1 nerve root stimulation.

Somatosensory evoked potential from S1 nerve root stimulation.

Authors :
Wu XD
Zhu Y
Chen WJ
Jin X
Tsai N
Huang HY
Jiang JY
Zhu DQ
Li PY
Weber R
Yuan W
Chen HJ
Wu, Xiao-Dong
Zhu, Yu
Chen, Wen-Jun
Jin, Xiang
Tsai, Nicholas
Huang, Huang-Yuan
Jiang, Jian-Yuan
Zhu, Dong-Qing
Source :
European Spine Journal; Oct2011, Vol. 20 Issue 10, p1613-1619, 7p
Publication Year :
2011

Abstract

The objective of this study was to detect cerebral potentials elicited by proximal stimulation of the first sacral (S1) nerve root at the S1 dorsal foramen and to investigate latency and amplitude of the first cerebral potential. Tibial nerve SEP and S1 nerve root SEP were obtained from 20 healthy subjects and 5 patients with unilateral sciatic nerve or tibial nerve injury. Stimulation of the S1 nerve root was performed by a needle electrode via the S1 dorsal foramen. Cerebral potentials were recorded twice to document reproducibility. Latencies and amplitudes of the first cerebral potentials were recorded. Reproducible cerebral evoked potentials were recorded and P20s were identified in 36 of 40 limbs in the healthy subjects. The mean latency of P20 was 19.8 ± 1.6 ms. The mean amplitude of P20-N30 was 1.2 ± 0.9 μV. In the five patients, P40 of tibial nerve SEP was absent, while well-defined cerebral potentials of S1 nerve root SEP were recorded and P20 was identified from the involved side. This method may be useful in detecting S1 nerve root lesion and other disorders affecting the proximal portions of somatosensory pathway. Combined with tibial nerve SEP, it may provide useful information for diagnosis of lesions affecting the peripheral nerve versus the central portion of somatosensory pathway. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09406719
Volume :
20
Issue :
10
Database :
Complementary Index
Journal :
European Spine Journal
Publication Type :
Academic Journal
Accession number :
104582134
Full Text :
https://doi.org/10.1007/s00586-011-1768-8