Reliability of somatosensory evoked potentials in intraoperative localization of the central sulcus in patients with perirolandic mass lesions

1997 ◽  
Vol 11 (5) ◽  
pp. 411-417 ◽  
Author(s):  
K. S. BABU, M. J. CHANDY
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Central Sulcus ◽  
Intraoperative Localization ◽  
Mass Lesions

Intraoperative localization of the central sulcus by cortical somatosensory evoked potentials in brain tumor

1992 ◽  
Vol 76 (5) ◽  
pp. 867-870 ◽  
Author(s):  
Akifumi Suzuki ◽  
Nobuyuki Yasui
Keyword(s):  
Brain Tumor ◽  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Topographic Mapping ◽  
Central Sulcus ◽  
Content Type ◽  
Accurate Localization ◽  
Intraoperative Localization ◽  
Sep Waves ◽  
Stimulation Of

✓ Perplexing findings of cortical somatosensory evoked potentials (SEP's) for determining the central sulcus during a craniotomy are reported in a case of brain tumor. On stimulation of the contralateral median nerve in that patient, phase-reversal of SEP waves N1 and P2 was observed not only across the central sulcus but also across the precentral sulcus. In topographic mapping of the N1-P2 amplitude, the sulcus dividing the maximum polarity was the central sulcus; this was confirmed by the cortical stimulation-evoked motor responses. For accurate localization of the central sulcus by cortical SEP's, the distribution of potentials must be analyzed with extensive exposure of the sensorimotor cortex.

Scalp topography of the short-latency components of the respiratory-related evoked potential in children

1996 ◽  
Vol 80 (5) ◽  
pp. 1785-1791 ◽  
Author(s):  
P. W. Davenport ◽  
I. M. Colrain ◽  
P. M. Hill
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Evoked Potential ◽  
Central Sulcus ◽  
Normal Children ◽  
Polarity Inversion ◽  
Negative Peak ◽  
Scalp Topography ◽  
Scalp Distribution ◽  
Latency Range

Respiratory-related evoked potentials (RREPs) have been elicited by inspiratory occlusion and recorded at electroencephalographic (EEG) sites overlying the somatosensory cortex in adults. The present study was the first to be conducted in normal children and was designed to identify the scalp distribution of the early RREP components. EEG responses to occlusion were recorded from CZ-C3, CZ-C4, and 17 sites referenced to the linked earlobes. The RREP was observed in all subjects in the CZ-C3 and CZ-C4 electrode pairs. The earlobe-referenced recordings revealed two RREP patterns. The P1 and N1 peaks were found in C3, C4, P3, P4, T3, and T4. The RREPs recorded from the F3, F4, F7, and F8 electrodes did not exhibit either the P1 or N1 peaks. A negative peak (NF) occurred approximately 13 ms after the P1 peak. The results show that the RREPs to inspiratory occlusions were present bilaterally but diminished greatly over midline sites. Furthermore, consistent with mechanically and electrically elicited somatosensory evoked potentials, the RREP displayed a polarity inversion over the central sulcus in the early component latency range.

Intraoperative Localization of the Subthalamic Nucleus Using Long-Latency Somatosensory Evoked Potentials

2017 ◽  
Vol 21 (6) ◽  
pp. 582-587 ◽  
Author(s):  
Carlos Trenado ◽  
Saskia Elben ◽  
Lena Friggemann ◽  
Stefan Jun Groiss ◽  
Jan Vesper ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Subthalamic Nucleus ◽  
Somatosensory Evoked Potentials ◽  
Long Latency ◽  
Intraoperative Localization

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.

Limiting the Current Density During Localization of the Primary Motor Cortex by Using a Tangential-Radial Cortical Somatosensory Evoked Potentials Model, Direct Electrical Cortical Stimulation, and Electrocorticography

Neurosurgery ◽  
2011 ◽  
Vol 69 (4) ◽  
pp. 893-898 ◽  
Author(s):  
Faisal R Jahangiri ◽  
Jonathan H Sherman ◽  
Jason Sheehan ◽  
Mark Shaffrey ◽  
Aaron S Dumont ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Primary Motor Cortex ◽  
Cortical Stimulation ◽  
Cortical Mapping ◽  
Mapping Technique ◽  
Central Sulcus ◽  
Sensory Cortices ◽  
Radial Model ◽  
The University

Abstract BACKGROUND: Traditionally, the dual-radial model, which requires high cortical stimulation intensities and may evoke intraoperative seizures, is used for mapping during resection of lesions within or near the central sulcus. OBJECTIVE: To examine the potential utility of using the multimodal tangential-radial triphasic model, which may increase the accuracy and reliability of cortical mapping at lower stimulation intensities. METHODS: We performed a retrospective review of intracranial neuromonitoring cases at the University of Virginia. The tangential-radial triphasic model used direct electrical cortical stimulation (DECS), electrocorticography, and somatosensory evoked potentials with an additional P25 peak for waveform interpretation, instead of the older dual-radial model with N20 and P30 peaks alone. The central sulcus and sensory cortex were localized by generating multiple sensory maps. DECS with 50-Hz frequency was applied. Electrocorticography was used for detection of afterdischarges. RESULTS: Fifteen consecutive intracranial cases were identified. The patients consisted of 8 males and 7 females ranging in age from 12 to 74 years (median, 53 years). Fourteen patients had an intra-axial cortical mass, and 1 patient had a cortical arteriovenous malformation. The DECS thresholds ranged from 3.7 to 12 mA (median, 6.2 mA). Localization of motor and sensory cortices was accurately performed at low thresholds with bipolar DECS in all patients. Intraoperative seizures occurred in 1 patient (7%), and new permanent postoperative functional deficits occurred in 1 patient (7%). CONCLUSION: Our mapping technique appears safe and reliable for resection near the central sulcus. The tangential-radial triphasic model allows for lower stimulation intensities, reducing the risk of intraoperative seizures.

Intraoperative transdural functional mapping

1994 ◽  
Vol 80 (4) ◽  
pp. 756-758 ◽  
Author(s):  
Daniel L. Silbergeld
Keyword(s):  
Evoked Potentials ◽  
General Anesthesia ◽  
Somatosensory Evoked Potentials ◽  
Cerebral Injury ◽  
Brain Swelling ◽  
Content Type ◽  
Cortical Stimulation Mapping ◽  
Dural Opening ◽  
Mass Lesions ◽  
Fine Print

✓ During craniotomy for supratentorial intraparenchymal space-occupying lesions, with the patient either under general anesthesia or awake, a smaller durotomy designed to expose only the region of resection may be desirable because of brain swelling. Similarly, during repeat craniotomy or craniotomy following cerebral injury or infection, pial-dural adhesions increase the risk of damage to essential cortex, making a limited dural opening desirable. Intraoperative transdural somatosensory evoked potentials and transdural cortical stimulation mapping permit localization of functional cortex prior to durotomy. These techniques can be combined with intraoperative transdural ultrasonography to identify topographical landmarks and borders of mass lesions.

Tumors localized near the central sulcus may cause increased somatosensory evoked potentials

2006 ◽  
Vol 117 (6) ◽  
pp. 1359-1366 ◽  
Author(s):  
Ivana Štetkárová ◽  
Lubor Stejskal ◽  
Markus Kofler
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Central Sulcus

scholarly journals Functional localization of sensorimotor cortex by somatosensory evoked potentials produced by femoral nerve stimulation

1996 ◽  
Vol 1 (3) ◽  
pp. E7 ◽  
Author(s):  
Akifumi Suzuki ◽  
Kimio Yoshioka ◽  
Hiromi Nishimura ◽  
Nobuyuki Yasui
Keyword(s):  
Evoked Potentials ◽  
Median Nerve ◽  
Nerve Stimulation ◽  
Somatosensory Evoked Potentials ◽  
Sensorimotor Cortex ◽  
Femoral Nerve ◽  
Central Sulcus ◽  
Functional Localization ◽  
Postcentral Gyrus ◽  
Interhemispheric Fissure

Cortical somatosensory evoked potentials (SSEPs) can be used to localize the central sulcus during a craniotomy. In particular, contralateral median nerve stimulation producing SSEPs can disclose the location of the central sulcus around the sensorimotor hand representation area. However, the median nerve cannot be stimulated in patients who undergo craniotomy at locations other than the hand representation area. The present study attempts to localize the central sulcus in the lateral surface of the brain near the interhemispheric fissure by stimulating the contralateral femoral nerve to produce SSEPs. Somatosensory evoked potentials were recorded between the superior lip of the interhemispheric fissure and 1.5 to 2 cm laterally in the cortex. Only seven of the 12 patients studied showed a phase reversal of the initial component across the central sulcus. The polarity was negative in the postcentral gyrus and positive in the precentral gyrus. The other five patients did not show a phase reversal of the initial component across the central sulcus. The amplitude was highest in the postcentral gyrus and the polarity was positive. Based on these results, the authors hypothesize that stimulating the contralateral femoral nerve to produce SSEPs and then analyzing the distribution of the SSEPs may provide a method for functional localization of the sensorimotor cortex around the interhemispheric fissure during craniotomy.

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