Interference of vibrations with input transmission in dorsal horn and cuneate nucleus in man: a study of somatosensory evoked potentials (SEPs) to electrical stimulation of median nerve and fingers

1989 ◽  
Vol 75 (3) ◽  
Author(s):  
V. Iba�ez ◽  
M.P. Deiber ◽  
F. Maugui�re
Keyword(s):  
Electrical Stimulation ◽  
Evoked Potentials ◽  
Median Nerve ◽  
Dorsal Horn ◽  
Somatosensory Evoked Potentials ◽  
Cuneate Nucleus ◽  
Stimulation Of

Localization of Stereotactic Targets by Microrecording of Thalamic Somatosensory Evoked Potentials

Neurosurgery ◽  
1991 ◽  
Vol 28 (2) ◽  
pp. 223-230 ◽  
Author(s):  
Fumio Shima ◽  
Takato Morioka ◽  
Shozo Tobimatsu ◽  
Omiros Kavaklis ◽  
Motohiro Kato ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Median Nerve ◽  
Somatosensory Evoked Potentials ◽  
Practical Method ◽  
The Other ◽  
Basal Region ◽  
Thalamic Nuclei ◽  
Median Nerve Stimulation ◽  
Lower Amplitude ◽  
Stimulation Of

Abstract To improve the localization of stereotactic targets, somatosensory evoked potentials (SEPs) were recorded from the thalamus and subthalamic area using a specially designed semimicroelectrode in 61 patients and a conventional “macroclectrode” in 17 patients. By means of the semimicroelectrode, median nerve stimulation evoked two distinct SEPs, consisting of a diphasic wave with a huge positivity restricted to the nucleus ventrocaudalis (Vc) and a triphasic wave of lower amplitude with a major negativity in the ventral part of the nucleus ventrointermedius (Vim) and nucleus ventrooralis posterior (Vop) as well as the subthalamic lemniscal pathway. The Vim-Vc junction could thus be clearly delineated by an abrupt transition of SEPs from one type to the other with a precision of 1 mm. The parvicellular part of the Vc (Vcpc). situated in its basal region, was distinguishable from the Vc proper by a significant reduction of the positivity elicited by stimulation of the median nerve and by a rapid growth of a diphasic SEPs to stimulation of the posterior tibial nerve. In the other thalamic nuclei, stimulation of the median nerve elicited triphasic SEPs of a very small amplitude, suggesting a volume conduction current from the lemniscal pathway. With the macroclectrode, the positivity in the Vc was sensitive to electrode manipulation and the thalamic nuclei could not be distinctly outlined. SEP monitoring using the semimicroelectrode significantly improved the precision of target localization, which allowed minimizing of the volume of the therapeutic lesion without losing surgical effectiveness, while avoiding complications associated with increased penetration of the coagulating electrode. It is suggested that recording serial thalamic SEPs with the semimicroelectrode is a practical method to refine stereotactic targets in the thalamus.

Nitric Oxide Implicates c-Fos Expression in the Cuneate Nucleus Following Electrical Stimulation of the Transected Median Nerve

2011 ◽  
Vol 37 (1) ◽  
pp. 84-95 ◽  
Author(s):  
Hsin-Ying Wang ◽  
Yi-Ju Tsai ◽  
Seu-Hwa Chen ◽  
Chi-Te Lin ◽  
June-Horng Lue
Keyword(s):  
Nitric Oxide ◽  
Electrical Stimulation ◽  
Median Nerve ◽  
Cuneate Nucleus ◽  
Fos Expression ◽  
Stimulation Of

Features of the nervous system damage in the registration of somatosensory-evoked potentials in patients with vibration disease

2020 ◽  
Vol 99 (10) ◽  
pp. 1073-1078
Author(s):  
Larisa S. Vasileva ◽  
Dina V. Rusanova ◽  
Natalya V. Slivnitsyna ◽  
Oleg L. Lakhman
Keyword(s):  
Spinal Cord ◽  
Evoked Potentials ◽  
Median Nerve ◽  
Somatosensory Evoked Potentials ◽  
Tibial Nerve ◽  
Popliteal Fossa ◽  
The State ◽  
Group 2 ◽  
Stimulation Of ◽  
Group 1

Introduction. Objective data necessary for acquiring information about the localization and severity of the pathological process in afferent conductive structures can be obtained by registering somatosensory evoked potentials (SSEP). The goal is to identify neurophysiological features during the registration of SSEPs during stimulation of the median and tibial nerves in patients with the vibrational disease (VD). Material and methods. 140 people were examined: group 1 - 50 patients with VD associated with the combined effects of local and general vibration (aged 48.7 ± 3.1 years); Group 2 - 50 patients with VD associated with exposure to local vibration (aged 48.9 ± 2.8 years); Group 3 - control, including 40 relatively healthy men without the exposure to vibration (aged 49.1 ± 2.5 years). Registration of SSEP was carried out with stimulation of the median and tibial nerves. Statistical processing of the results is “Statistica 10.0” (StatSoft, USA, 2011). The differences in the mean values in the samples were estimated using the Wilcoxon criterion. The differences were considered statistically significant at p <0.05 and 0.01. Results. When the median nerve was stimulated, the latency of the SSVP components increased: for group 1 - indices N9, N10, N11, N13, N20, P25, N30, for group 2 - components N10, N11, N13, N30. A marked increase in latency and intervals was found in group 1. When the tibial nerve was stimulated in group 1, a statistically significant increase in the latency of components N18, N22, N30, characterizing the conduction from the popliteal fossa to the lumbar and then to the cervical level of the spine was revealed. Discussion. The results of the study are consistent with data from previous studies on SSEPs with stimulation of the median nerve. For the first time, it was revealed that in patients of group 1, the registration of SSEP during stimulation of the tibial nerve gives an increase in the time of the impulse at the peripheral level in the popliteal fossa. Conclusion. The SSVP registration method expands the state of afferent pathways. Changes in the state of neurons of the central afferent conducting structures in patients of groups 1 and 2 consisted of more pronounced functional changes at the level of the cervical spinal cord and somatosensory cortex in group 1. During stimulation of the tibial nerve, a slowing down of the afferent excitation wave from the distal sections and further along the ascending paths of the spinal cord to the posterior pillars of the cervical region was noted.

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