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Somatosensory Evoked Potentials

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https://www.readbyqxmd.com/read/28642996/central-conduction-abnormalities-in-patients-receiving-levodopa-carbidopa-intestinal-gel-infusion
#1
Francesco Bove, Marco Luigetti, Lara Gallicchio, Valentina Recchia, Antonella Petruzzellis, Riccardo Di Iorio, Filippo Tamma, Alfonso Fasano
In recent years, several studies have reported a relatively high frequency of polyneuropathy in patients with Parkinson's disease (PD), in particular, in patients receiving levodopa-carbidopa intestinal gel (LCIG) infusion. In spite of the several patients investigated with nerve conduction studies, no study has prospectively explored a possible central nervous system involvement of patients receiving LCIG infusion. We prospectively evaluated eight PD patients receiving LCIG infusion, who underwent neurophysiological evaluations with nerve conduction studies, visual, somatosensory and motor evoked potentials before LCIG infusion, and 1 and 6 months after...
June 22, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28634442/mild-traumatic-brain-injury-evokes-pyramidal-neuron-axon-initial-segment-plasticity-and-diffuse-presynaptic-inhibitory-terminal-loss
#2
Michal Vascak, Jianli Sun, Matthew Baer, Kimberle M Jacobs, John T Povlishock
The axon initial segment (AIS) is the site of action potential (AP) initiation, thus a crucial regulator of neuronal activity. In excitatory pyramidal neurons, the high density of voltage-gated sodium channels (NaV1.6) at the distal AIS regulates AP initiation. A surrogate AIS marker, ankyrin-G (ankG) is a structural protein regulating neuronal functional via clustering voltage-gated ion channels. In neuronal circuits, changes in presynaptic input can alter postsynaptic output via AIS structural-functional plasticity...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28633394/diagnostic-accuracy-of-somatosensory-evoked-potential-monitoring-in-evaluating-neurological-complications-during-endovascular-aneurysm-treatment
#3
William J Ares, Ramesh M Grandhi, David M Panczykowski, Gregory M Weiner, Parthasarathy Thirumala, Miguel E Habeych, Donald J Crammond, Michael B Horowitz, Brian T Jankowitz, Ashutosh Jadhav, Tudor G Jovin, Andrew F Ducruet, Jeffrey Balzer
BACKGROUND: Somatosensory evoked potential (SSEP) monitoring is used extensively for early detection and prevention of neurological complications in patients undergoing many different neurosurgical procedures. However, the predictive ability of SSEP monitoring during endovascular treatment of cerebral aneurysms is not well detailed. OBJECTIVE: To evaluate the performance of intraoperative SSEP in the prediction postprocedural neurological deficits (PPNDs) after coil embolization of intracranial aneurysms...
June 14, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28631147/the-motor-cortical-representation-of-a-muscle-is-not-homogeneous-in-brain-connectivity
#4
Jo Armour Smith, Alaa Albishi, Sarine Babikian, Skulpan Asavasopon, Beth E Fisher, Jason J Kutch
Functional connectivity patterns of the motor cortical representational area of single muscles have not been extensively mapped in humans, particularly for the axial musculature. Functional connectivity may provide a neural substrate for adaptation of muscle activity in axial muscles that have both voluntary and postural functions. The purpose of this study was to combine brain stimulation and neuroimaging to both map the cortical representation of the external oblique (EO) in primary motor cortex (M1) and supplementary motor area (SMA), and to establish the resting-state functional connectivity associated with this representation...
June 19, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28630880/prominent-lateral-spread-of-imaged-evoked-activity-beyond-cortical-columns-in-barrel-cortex-provides-foundation-for-coding-whisker-identity
#5
Nathan S Jacobs, Ron D Frostig
The posterior medial barrel subfield (PMBSF) of a rat primary somatosensory cortex exquisitely demonstrates topography and columnar organization, defining features of sensory cortices in the mammalian brain. Optical imaging and neuronal recordings in rat PMBSF demonstrate how evoked cortical activity following single whisker stimulation also rapidly spreads laterally into surrounding cortices, disregarding columnar and modality boundaries. The current study quantifies the spatial prominence of such lateral activity spreads by demonstrating that functional connectivity between laterally spaced cortical locations is actually stronger than between vertically spaced cortical locations...
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/28630252/alpha-band-brain-oscillations-shape-the-processing-of-perceptible-as-well-as-imperceptible-somatosensory-stimuli-during-selective-attention
#6
Norman Forschack, Till Nierhaus, Matthias M Müller, Arno Villringer
Attention filters and weights sensory information according to behavioral demands. Stimulus-related neural responses are increased for the attended stimulus. Does alpha-band activity mediate this effect and is it restricted to conscious sensory events (suprathreshold), or does it also extend to unconscious stimuli (subthreshold)? To address these questions, we recorded EEG in healthy male and female volunteers undergoing subthreshold and suprathreshold somatosensory electrical stimulation to the left or right index finger...
June 19, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28627417/regulation-of-primary-motor-cortex-excitability-by-repetitive-passive-finger-movement-frequency
#7
Ryoki Sasaki, Masaki Nakagawa, Shota Tsuiki, Shota Miyaguchi, Sho Kojima, Kei Saito, Yasuto Inukai, Mitsuhiro Masaki, Naofumi Otsuru, Hideaki Onishi
Somatosensory input induced by passive movement activates primary motor cortex (M1). We applied repetitive passive movement (RPM) of different frequencies to test if modulation of M1 excitability depends on RPM frequency. Twenty-seven healthy subjects participated in this study. Motor-evoked potentials (MEPs) elicited by transcranial magnetic stimulation (TMS) to left M1 were recorded from the right first dorsal interosseous muscle (FDI) to assess corticospinal excitability (experiment 1: n=15), and F-waves were measured from the right FDI as an index of spinal motoneuron excitability (experiment 2: n=15)...
June 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28621620/deep-brain-stimulation-for-the-early-treatment-of-the-minimally-conscious-state-and-vegetative-state-experience-in-14-patients
#8
Darko Chudy, Vedran Deletis, Fadi Almahariq, Petar Marčinković, Jasenka Škrlin, Veronika Paradžik
OBJECTIVE An effective treatment of patients in a minimally conscious state (MCS) or vegetative state (VS) caused by hypoxic encephalopathy or traumatic brain injury (TBI) is not yet available. Deep brain stimulation (DBS) of the thalamic reticular nuclei has been attempted as a therapeutic procedure mainly in patients with TBI. The purpose of this study was to investigate the therapeutic use of DBS for patients in VS or MCS. METHODS Fourteen of 49 patients in VS or MCS qualified for inclusion in this study and underwent DBS...
June 16, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28620788/comparison-of-intraoperative-neurophysiologic-monitoring-outcomes-between-cervical-and-thoracic-spine-surgery
#9
Shujie Wang, Yuan Tian, Xiangquan Lin, Zhifu Ren, Yu Zhao, Jiliang Zhai, Xiaojuan Zhang, Yanwei Zhao, Yingyue Dong, Congran Zhao, Ye Tian
PURPOSE: The objective is to compare the intraoperative monitoring (IOM) outcomes between degenerative cervical and thoracic spine decompression surgery. METHOD: A total of 97 patients with cervical compression myelopathy (CCM) and 75 patients with thoracic compression myelopathy (TCM) were prospectively collected between December 2012 and June 2015 in our spine center. Somatosensory-evoked potentials (SSEP) and motor-evoked potentials (MEP) were used for IOM. The postoperative neurologic status of each patient was assessed immediately after surgery...
June 15, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28619491/the-accuracy-of-multimodality-intraoperative-neuromonitoring-to-predict-postoperative-neurological-deficits-following-cervical-laminoplasty
#10
Junichi Oya, John F Burke, Todd Vogel, Boby Tay, Dean Chou, Praveen Mummaneni
BACKGROUND: Intraoperative neuromonitoring (IONM) has been reported to be sensitive and specific in the detection of neurological injury during spinal surgery. However, utilizing multimodality IONM to predict postoperative neural deficits following cervical laminoplasty remains unclear. OBJECTIVE: The purpose of this study is to clarify the incidence of C5 palsy utilizing multimodality IONM and to compare the accuracy of multimodality IONM to predict postoperative C5 palsy against isolated transcranial motor-evoked potential (MEP)...
June 12, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28614189/a-dose-response-study-of-topical-allyl-isothiocyanate-mustard-oil-as-human-surrogate-model-of-pain-hyperalgesia-and-neurogenic-inflammation
#11
H H Andersen, S Lo Vecchio, P Gazerani, L Arendt-Nielsen
Despite being a ubiquitous animal pain model, the natural TRPA1-agonist allyl-isothiocyanate (AITC, also known as "mustard oil") has only been sparsely investigated as a potential human surrogate model of pain, sensitization, and neurogenic inflammation. Its dose-response as an algogenic, sensitizing irritant remains to be elucidated in human skin. Three concentrations of AITC (10%, 50%, 90%) and vehicle (paraffin) were applied for 5 min to 3x3 cm areas on the volar forearms in 14 healthy volunteers, and evoked pain intensity (visual analog scale 0-100 mm) and pain quality were assessed...
June 9, 2017: Pain
https://www.readbyqxmd.com/read/28612398/polyethylene-glycol-induced-motor-recovery-after-total-spinal-transection-in-rats
#12
Shuai Ren, Ze-Han Liu, Qiong Wu, Kuang Fu, Jun Wu, Li-Ting Hou, Ming Li, Xin Zhao, Qing Miao, Yun-Long Zhao, Sheng-Yu Wang, Yan Xue, Zhen Xue, Ya-Shan Guo, Sergio Canavero, Xiao-Ping Ren
AIMS: Despite more than a century of research, spinal paralysis remains untreatable via biological means. A new understanding of spinal cord physiology and the introduction of membrane fusogens have provided new hope that a biological cure may soon become available. However, proof is needed from adequately powered animal studies. METHODS AND RESULTS: Two groups of rats (n=9, study group, n=6 controls) were submitted to complete transection of the dorsal cord at T10...
June 14, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28608136/early-impairment-of-intracranial-conduction-time-predicts-mortality-in-deeply-sedated-critically-ill-patients-a-prospective-observational-pilot-study
#13
Eric Azabou, Benjamin Rohaut, Nicholas Heming, Eric Magalhaes, Régine Morizot-Koutlidis, Stanislas Kandelman, Jeremy Allary, Guy Moneger, Andrea Polito, Virginie Maxime, Djillali Annane, Frederic Lofaso, Fabrice Chrétien, Jean Mantz, Raphael Porcher, Tarek Sharshar
BACKGROUND: Somatosensory (SSEP) and brainstem auditory (BAEP) evoked potentials are neurophysiological tools which, respectively, explore the intracranial conduction time (ICCT) and the intrapontine conduction time (IPCT). The prognostic values of prolonged cerebral conduction times in deeply sedated patients have never been assessed. Sedated patients are at risk of developing new neurological complications, undetected. In this prospective observational bi-center pilot study, we investigated whether early impairment of SSEP's ICCT and/or BAEP's IPCT could predict in-ICU mortality or altered mental status (AMS), in deeply sedated critically ill patients...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28606109/neurophysiological-assessment-of-spinal-cord-injuries-in-dogs-using-somatosensory-and-motor-evoked-potentials
#14
REVIEW
Maria Claudia Campos Mello Inglez de Souza, Ricardo José Rodriguez Ferreira, Geni Cristina Fonseca Patricio, Julia Maria Matera
Somatosensory evoked potentials (SSEPs) and motor evoked potentials (MEPs) are non-invasive neurophysiological tests that reflect the functional integrity of sensory and motor pathways. Despite their extensive use and description in human medicine, reports in veterinary medicine are scarce. SSEPs are obtained via peripheral stimulation of sensory or mixed nerves; stimulation induces spinal and cortical responses, which are recorded when sensory pathways integrity is preserved. MEPs can be obtained via transcranial electrical or magnetic stimulation; in this case, thoracic and pelvic limb muscle responses are captured if motor pathways are preserved...
June 12, 2017: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/28604088/effect-of-topical-anesthesia-using-an-adhesive-patch-and-anesthetic-solution
#15
Toshiyuki Kishimoto, Nobuyuki Matsuura, Masataka Kasahara, Tatsuya Ichinohe
We analyzed trigeminal somatosensory evoked potentials (TSEP) to the alveolar mucosa to investigate the efficacy of an amide local anesthetic, 2% lidocaine hydrochloride with 12.5 μg/mL epinephrine (Lido treatment) as a topical anesthetic. Eighteen consenting healthy adult volunteers were enrolled. A volume of 0.06 mL of Lido, 0.06 g of 20% benzocaine, or 0.06 mL of physiological saline (control) was instilled onto a hemostatic adhesive patch, which was then applied to the alveolar mucosa at the maxillary right canine for 5 minutes...
2017: Anesthesia Progress
https://www.readbyqxmd.com/read/28592077/-clinical-effects-of-microsurgery-in-spinal-cord-anaplastic-astrocytoma
#16
L Zhang, W Q Jia, D S Kong, Z F Zhang, J Yang
Objective: To investigate the surgical outcomes and prognosis of spinal cord anaplastic astrocytoma (AA). Methods: A total of 27 consecutive patients diagnosed as spinal cord AA between January 2008 and May 2015 in Department of Neurosurgery of Beijing Tiantan Hospital were retrospectively reviewed. There were 18 males and 9 females, the mean age was (30.7±13.0) years (ranging from 5 to 52 years). The lesions were located at cervical level in 8 patients, at thoracic level in 9 patients, at cervicothoracic level in 3 patients, and at thoracolumbar level in 7 patients, the average number of vertebral was 3...
June 1, 2017: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/28589067/intraoperative-dexmedetomidine-induced-polyuric-syndrome
#17
Shannon Granger, David Ninan
A 23-year-old male trauma patient with a cervical spine fracture underwent an anterior and posterior discectomy and spinal fusion surgery. The patient presented to the operating room with a stabilizing halo fixation device in place, and a fiberoptic intubation was performed with dexmedetomidine for sedation. During the surgical procedure, general anesthesia was maintained with a propofol and remifentanil infusion as the patient was monitored using somatosensory and motor evoked potentials. The patient's urine output increased gradually during the nine-hour surgical procedure from 150 mL/hour to over 700 mL/hour in the eighth hour of the procedure, where it remained until the end of the procedure...
May 3, 2017: Curēus
https://www.readbyqxmd.com/read/28586081/bed%C3%A3-mning-av-neuro%C3%A2-logisk-prognos-efter-hj%C3%A3-rtstopp-uppdaterade-rekommendationer-fr%C3%A3-n-svenska-hlr-r%C3%A3-dets-expertgrupp
#18
Christian Rylander, Hans Friberg, Elna-Marie Larsson, Lars Johan Liedholm, Sten Rubertsson, Tobias Cronberg
Assessment of neurologic prognosis after cardiac arrest. Updated recommendations from the Swedish CPR Council Expert Group European Resuscitation Council (ERC) issued updated guidelines for postresuscitation care in 2015. This paper provides updated Swedish recommendations for neurological prognostication of patients remaining unconscious after cardiac arrest (CA). The prognostication should be based on independent methods; clinical and neurophysiological examinations, imaging and biomarkers. It should not be performed earlier than three days after CA and any influence from sedatives must be negligible...
June 2, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28580648/paired-associative-stimulation-delivered-by-pairing-movement-related-cortical-potentials-with-peripheral-electrical-stimulation-an-investigation-of-the-duration-of-neuromodulatory-effects
#19
Sharon Olsen, Nada Signal, Imran Khan Niazi, Thomas Christensen, Mads Jochumsen, Denise Taylor
BACKGROUND: Novel paired associative stimulation (novel-PAS), delivered by pairing movement-related cortical potentials (MRCPs) with electrical stimulation of somatosensory afferents, is an innovative neuromodulatory intervention. Novel-PAS results in increased corticomotor excitability and has potential as a rehabilitative adjunct to improve outcomes following stroke. The duration of its excitatory effect has important implications for how this novel PAS intervention might be applied within a traditional therapy session, but previous research has not explored its effects beyond 30 min post-intervention...
June 5, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28576065/-chitosan-g-glycidyl-methacrylate-xanthan-hydrogel-implant-in-wistar-rats-for-spinal-cord-regeneration
#20
E A Elizalde-Peña, I A Quintero-Ortega, D G Zárate-Triviño, A Nuño-Licona, J Gough, I C Sanchez, D I Medina, G Luna-Barcenas
This work reports the results of in vivo assays of an implant composed of the hydrogel Chitosan-g-Glycidyl Methacrylate-Xanthan [(CTS-g-GMA)-X] in Wistar rats. Degradation kinetics of hydrogels was assessed by lysozyme assays. Wistar rats were subjected to laminectomy by cutting the spinal cord with a scalpel. After the surgical procedure, hydrogels were implanted in the injured zone (level T8). Somatosensory evoked potentials (SEPs) obtained by electric stimulation onto periphery nerves were registered in the corresponding central nervous system (CNS) areas...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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