The relationship between somatosensory evoked potentials and evoked potentials during surgery to estimate cervical cord function

1997 ◽  
Vol 103 (1) ◽  
pp. 119-120
Author(s):  
T Hayashida
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Cervical Cord ◽  
The Relationship

Intraoperative Localization of a Cervicomedullary Glioma from the Killed End Potential: Illustrative Case

Neurosurgery ◽  
1990 ◽  
Vol 26 (6) ◽  
pp. 1038-1041 ◽  
Author(s):  
Takato Morioka ◽  
Kiyotaka Fujii ◽  
Masamitsu Mitani ◽  
Masashi Fukui
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Cervical Cord ◽  
Illustrative Case ◽  
Recording Electrode ◽  
Positive Potential ◽  
Cervicomedullary Junction ◽  
Upper Cervical ◽  
Intraoperative Localization

Abstract We recorded the intraoperative somatosensory evoked potentials directly from the upper cervical cord and medulla in a patient with an intrinsic tumor at the region of the cervicomedullary junction. The killed end potential, a large positive potential, was obtained at the caudal end of the tumor. This type of potential occurs when an impulse approaches but never passes beyond the recording electrode. Myelotomy guided by the killed end potential enabled appropriate spinal and medullary dissection and led to early encounter with the cervicomedullary tumor.

The relationship in gating effects between short-latency and long-latency somatosensory-evoked potentials

Neuroreport ◽  
2011 ◽  
Vol 22 (18) ◽  
pp. 1000-1004 ◽  
Author(s):  
Hiroki Nakata ◽  
Kiwako Sakamoto ◽  
Masato Yumoto ◽  
Ryusuke Kakigi
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Short Latency ◽  
Long Latency ◽  
The Relationship

Dynamic somatosensory evoked potentials to determine electrophysiological effects on the spinal cord during cervical spine extension

2013 ◽  
Vol 19 (3) ◽  
pp. 288-292 ◽  
Author(s):  
Yuichiro Morishita ◽  
Takeshi Maeda ◽  
Takayoshi Ueta ◽  
Masatoshi Naito ◽  
Keiichiro Shiba
Keyword(s):  
Spinal Cord ◽  
Cervical Spine ◽  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Cervical Cord ◽  
Control Group ◽  
Neutral Position ◽  
Healthy Controls ◽  
Median Nerve Stimulation ◽  
Significant Difference

Object The goal of this prospective study was to investigate somatosensory evoked potentials (SSEPs) during dynamic motion of the cervical spine and to evaluate the efficacy of analyzing dynamic SSEPs for predicting dynamic effects on the spinal cord in patients with cervical spondylotic myelopathy (CSM). Methods In total, 40 human subjects (20 CSM patients and 20 healthy volunteers as a control group) were examined prospectively using dynamic SSEPs with median nerve stimulation. The CSM patients showed cervical myelopathy due to cervical cord compression at the C4–5 segment. The SSEPs were examined with the cervical spine in a neutral position and at a 20° extension for 10 and 20 minutes. Changes in the N20 latency and amplitude were determined and analyzed. The authors defined the changes in the N20 latency and N20 amplitude between the neutral and extension positions of the cervical spine as percent latency and amplitude, respectively. Results In the CSM patients, SSEPs tended to deteriorate after cervical spine extension, and a statistically significant deterioration of the N20 amplitude after the extension was observed. Moreover, the percent latency and amplitude progressively increased during cervical spine extension in these patients. In the healthy controls, SSEPs tended to deteriorate with cervical spine extension, but these changes did not result in statistically significant differences. Moreover, in this group the percent latency and amplitude were almost identical during the extension. When the CSM patients and the healthy controls were compared, a significant difference in the percent amplitude was observed between the 2 groups during the cervical spine extension. Conclusions This study suggests the potential of dynamic SSEPs as a useful neurophysiological technique to detect the effect of dynamic factors on the pathogenesis of CSM.

Estimation of cervical cord dysfunction by somatosensory evoked potentials

2000 ◽  
Vol 23 (10) ◽  
pp. 1589-1593 ◽  
Author(s):  
Tatsuro Hayashida ◽  
Taku Ogura ◽  
Hitoshi Hase ◽  
Toru Osawa ◽  
Yasusuke Hirasawa
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Cervical Cord

Selective Modification of Somatosensory Evoked Potential during Voluntary Finger Movement in Humans

1997 ◽  
Vol 85 (1) ◽  
pp. 259-266 ◽  
Author(s):  
Y. Nishihira ◽  
K. Funase ◽  
H. Araki ◽  
K. Imanaka
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Voluntary Movement ◽  
Evoked Potential ◽  
Somatosensory Evoked Potential ◽  
Finger Movement ◽  
The Third ◽  
Middle Latency ◽  
The Relationship

We examined changes in somatosensory evoked potentials (SEPs) during voluntary movement of fingers innervated by the stimulated nerve and those not innervated by the stimulated nerve and the relationship to the kind of movement modality. Analysis showed that the amplitude of most components at F3, C3', and P3, except for P45 at C3, N35 and P45 at P3, decreased during voluntary finger movement tasks. Further, we found that the components of P40 at F3, P45 at C3', and N35 at P3 were increased during the voluntary pulling movement of the second and the third digits compared to those during the voluntary pushing movement of the fourth and the fifth digits, whereas all other components were decreased at F3, C3', and P3. We also found that not all components of SEPs were decreased while some SEPs in middle latency were increased. In conclusion, we confirmed the selectivity in attenuation of the SEPs. Moreover, we noted an interesting finding that the selectivity of attenuation of the SEPs was most frequently observed in the N20, P30 (P25 at F3), N35 (N30 at F3), and P45 (P40 at F3) components at F3, C3', and P3.

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