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Motor Evoked Potentials

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https://www.readbyqxmd.com/read/28327949/resection-of-navigated-transcranial-magnetic-stimulation-positive-prerolandic-motor-areas-causes-permanent-impairment-of-motor-function
#1
Tobias Moser, Lucia Bulubas, Jamil Sabih, Neal Conway, Noémie Wildschutz, Nico Sollmann, Bernhard Meyer, Florian Ringel, Sandro M Krieg
BACKGROUND: Navigated transcranial magnetic stimulation (nTMS) helps to determine the distribution of motor eloquent areas prior to brain surgery. Yet, the eloquence of primary motor areas frontal to the precentral gyrus identified via nTMS is unclear. OBJECTIVE: To investigate the resection of nTMS-positive prerolandic motor areas and its correlation with postsurgical impairment of motor function. METHODS: Forty-three patients with rolandic or prerolandic gliomas (WHO grade I-IV) underwent nTMS prior to surgery...
February 24, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28327942/evaluation-of-the-high-frequency-monopolar-stimulation-technique-for-mapping-and-monitoring-the-corticospinal-tract-in-patients-with-supratentorial-gliomas-a-proposal-for-intraoperative-management-based-on-neurophysiological-data-analysis-in-a-series-of-ninety
#2
Gerard Plans, Isabel Fernández-Conejero, Xavier Rifà-Ros, Alejandro Fernández-Coello, Aleix Rosselló, Andreu Gabarrós
BACKGROUND: Intraoperative identification and preservation of the corticospinal tract is often necessary for glioma resection. OBJECTIVE: To make a proposal for intraoperative management with the high-frequency monopolar stimulation technique for monitoring the corticospinal tract. METHODS: Ninety-two patients operated on with the assistance of the high-frequency monopolar stimulation. Clinical and neurophysiological data have been related with the motor status at 3 months to establish prognostic factors of motor deterioration...
January 13, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28327904/the-cost-of-brain-surgery-awake-vs-asleep-craniotomy-for-perirolandic-region-tumors
#3
Chikezie I Eseonu, Jordina Rincon-Torroella, Karim ReFaey, Alfredo Quiñones-Hinojosa
BACKGROUND: Cost effectiveness has become an important factor in the health care system, requiring surgeons to improve efficacy of procedures while reducing costs. An awake craniotomy (AC) with direct cortical stimulation (DCS) presents one method to resect eloquent region tumors; however, some authors assert that this procedure is an expensive alternative to surgery under general anesthesia (GA) with neuromonitoring. OBJECTIVE: To evaluate the cost effectiveness and clinical outcomes between AC and GA patients...
March 15, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28326007/evaluation-of-the-cortical-silent-period-of-the-laryngeal-motor-cortex-in-healthy-individuals
#4
Mo Chen, Rebekah L S Summers, George S Goding, Sharyl Samargia, Christy L Ludlow, Cecília N Prudente, Teresa J Kimberley
Objective: This work aimed to evaluate the cortical silent period (cSP) of the laryngeal motor cortex (LMC) using the bilateral thyroarytenoid (TA) muscles with transcranial magnetic stimulation (TMS). Methods: In 11 healthy participants, fine-wire electromyography (EMG) was used to record bilateral TA muscle responses to single pulse TMS delivered to the LMC in both hemispheres. Peripheral responses to stimulation over the mastoid, where the vagus nerve exits the skull, were collected to verify the central origin of the cortical stimulation responses by comparing the latencies...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28325700/the-relationship-between-preoperative-needle-electromyography-findings-and-muscle-power-restoration-after-surgery-in-severe-carpal-tunnel-syndrome-patients
#5
Yuki Hara, Yasumasa Nishiura, Naoyuki Ochiai, Shinji Murai, Masashi Yamazaki
PURPOSE: Needle electromyography provides essential information about the functional aspects of the muscle. But little attention has been given in the literature to needle electromyography examinations in carpal tunnel syndrome. We examined the relationship between preoperative needle electromyography findings and functional recovery of the abductor pollicis brevis (APB) muscle in severe carpal tunnel syndrome patients. METHODS: The subjects of this study were 49 patients, 58 hands, who fit the following 5 criteria: (1) idiopathic carpal tunnel syndrome; (2) pre-op MMT grade of the APB muscle was M0 or M1; (3) APB-CMAP (compound muscle action potential) was not evoked in a median nerve conduction study; (4) needle electromyography of the APB muscle had been done; (5) underwent carpal tunnel release only...
March 18, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28325034/modulation-of-motor-cortex-excitability-by-peripheral-magnetic-stimulation-of-different-stimulus-sites-and-frequencies
#6
A Sato, X Liu, T Torii, M Iwahashi, K Iramina
Peripheral stimulation is known to influence the state of cortical excitability. The purpose of this study is to investigate whether peripheral magnetic stimulation has similar effects on cortical excitability to transcranial magnetic stimulation (TMS). A magnetic stimulator with a flat figure-of-eight coil was used for both TMS, and peripheral magnetic stimulation applied to the bilateral forearms. TMS was performed on the left primary motor cortex to evaluate influence of the peripheral magnetic stimulation, and motor evoked potential (MEP) was measured from the right first dorsal interosseous...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28323091/age-related-differences-in-functional-synchronization-of-eeg-activity-as-evaluated-by-means-of-tms-eeg-coregistrations
#7
Florinda Ferreri, Fabrizio Vecchio, Andrea Guerra, Francesca Miraglia, David Ponzo, Luca Vollero, Giulio Iannello, Sara Maatta, Esa Mervaala, Paolo Maria Rossini, Vincenzo Di Lazzaro
It was recently demonstrated that the characteristics of EEG rhythms preceding a transcranial magnetic stimulation (TMS) of the motor cortex (M1) influence the motor-evoked potential (MEP) amplitude with a peculiar pattern, thus reflecting the M1 functional state. As physiological aging is related to a decrease in motor performance and changes in excitability and connectivity strength within cerebral sensorimotor circuits, we aimed to explore whether aging affects EEG-MEP interactions. Using MRI-navigated TMS and multichannel EEG, we compared the EEG-MEP interactions observed in healthy aged subjects with those observed in young volunteers...
March 16, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28320670/bci-use-and-its-relation-to-adaptation-in-cortical-networks
#8
Kaitlyn Casimo, Kurt E Weaver, Jeremiah Wander, Jeffrey G Ojemann
Brain-computer interfaces (BCIs) carry great potential in the treatment of motor impairments. As a new motor output, BCIs interface with the native motor system, but acquisition of BCI proficiency requires a degree of learning to integrate this new function. In this review, we discuss how BCI designs often take advantage of the brain's motor system infrastructure as sources of command signals. We highlight a growing body of literature examining how this approach leads to changes in activity across cortex, including beyond motor regions, as a result of learning the new skill of BCI control...
March 13, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28320257/academic-stress-disrupts-cortical-plasticity-in-graduate-students
#9
Carmen Concerto, Dhaval Patel, Carmenrita Infortuna, Eileen Chusid, Maria R Muscatello, Antonio Bruno, Rocco Zoccali, Eugenio Aguglia, Fortunato Battaglia
Medical education is a time of high stress and anxiety for many graduate students in medical professions. In this study, we sought to investigate the effect of academic stress on cortical excitability and plasticity by using transcranial magnetic stimulation (TMS). We tested two groups (n = 13 each) of healthy graduate medical students (mean age 33.7 ± 3.8 SE). One group was tested during a final exam week (High-stress group) while the other group was tested after a break, during a week without exams (Low-stress group)...
March 20, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28320184/reliability-of-single-and-paired-pulse-transcranial-magnetic-stimulation-for-the-assessment-of-knee-extensor-muscle-function
#10
John Temesi, Sandy N Ly, Guillaume Y Millet
This study examined inter-session and intra-session transcranial magnetic stimulation (TMS) reliability at two test stimulus intensities in the knee extensors. Strong and weak TMS was delivered via single- and paired- (3-ms and 100-ms inter-stimulus interval) pulses on the same day and different days. All stimuli were delivered during isometric contractions of the knee extensors at 20% of maximal voluntary force. Motor-evoked potentials (MEP) were assessed in quadriceps femoris muscles. Relative (intra-class correlation coefficient, ICC) and absolute (standard error of measurement, SEM) reliability and variability (coefficient of variation) were assessed...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28319877/modulating-motor-cortical-neuroplasticity-with-priming-paired-associative-stimulation-in-young-and-old-adults
#11
George M Opie, Aylin K Post, Michael C Ridding, Ulf Ziemann, John G Semmler
OBJECTIVE: To examine the effect of priming paired associative stimulation (PAS) on the modulation of motor cortex (M1) plasticity in young and old adults. METHODS: Fifteen young (20-27yrs) and 15 old (61-79yrs) subjects participated in 3 experimental sessions, with each session involving two consecutive PAS protocols separated by 10mins. The first (priming) protocol was either PASLTP (ISI=N20 latency+2ms), PASLTD (ISI=N20 latency-10ms), or PASControl (ISI=100ms), whereas the second (test) protocol was always PASLTP...
February 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28317837/inhibitory-responses-mediated-by-vagal-nerve-stimulation-are-diminished-in-stomachs-of-mice-with-reduced-intramuscular-interstitial-cells-of-cajal
#12
Elizabeth A H Beckett, Kenton M Sanders, Sean M Ward
Intramuscular interstitial cells of Cajal (ICC-IM) are closely associated with enteric motor nerve terminals and electrically coupled to smooth muscle cells within the gastric musculature. Previous studies investigating the role of ICC-IM in motor neurotransmission have used indiscriminate electric field stimulation of neural elements within the gastric wall. To determine the role of ICC-IM in transduction of vagally-mediated motor input to gastric muscles electrical and mechanical responses to selective electrical vagal stimulation (EVS) were recorded from gastric fundus and antral regions of wild type and W/W(V) mice, which lack most ICC-IM...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28316077/development-of-resistance-to-serotonin-induced-itch-in-bile-duct-ligated-mice
#13
Sattar Ostadhadi, Nazgol-Sadat Haddadi, Arash Foroutan, Ehsan Azimi, Sarina Elmariah, Ahmad-Reza Dehpour
Cholestatic itch can be severe and significantly impair the quality of life of patients. Serotonin system is implicated in cholestatic itch; however, the pruritogenic properties of serotonin have not been evaluated in cholestatic mice. Here, we investigated the serotonin-induced itch in cholestatic mice which was induced by bile duct ligation (BDL). Serotonin, sertraline or saline were administered intradermally to the rostral back area in BDL and sham-operated (SHAM) mice, and the scratching behavior was videotaped for 1 hour...
March 18, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28315613/parietomotor-connectivity-in-the-contralesional-hemisphere-after-stroke-a-paired-pulse-tms-study
#14
Etienne Allart, Arnaud Delval, Alexandre Caux-Dedeystere, Julien Labreuche, Romain Viard, Renaud Lopes, Hervé Devanne
OBJECTIVES: To assess the contralesional connectivity between the posterior parietal cortex (PPC) and the motor cortex (M1) in stroke patients, and to probe putative relationships with spatial neglect and motor impairment. METHODS: In 12 right-side stroke patients and 12 age-matched healthy controls, we used paired-pulse transcranial magnetic stimulation to assess the contralesional connectivity between three left-side PPC sites (the anterior intraparietal sulcus (aIPS), the posterior intraparietal sulcus and the superior parieto-occipital cortex (SPOC)) and M1...
March 1, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28303067/intraspinal-meningioma-with-malignant-transformation-and-distant-metastasis
#15
Kenyu Ito, Shiro Imagama, Kei Ando, Kazuyoshi Kobayashi, Yoji Shido, Yoshida Go, Hideyuki Arima, Shunsuke Kanbara, Takanori Hirose, Yukihiro Matsuyama, Yoshihiro Nishida, Naoki Ishiguro
Meningioma is typically considered to be a benign tumor. Malignant transformation and metastasis of meningiomas are rare. Moreover, most meningiomas are intracranial, and there are few reports on intraspinal meningiomas. This report aimed to describe the clinical features and pathological findings of a case of malignant transformation and distant metastasis of intraspinal meningioma, with a review of the literature. A 44-year-old man with a bilateral lower limb paresis was diagnosed with an intradural extramedullary tumor of the thoracic spine...
February 2017: Nagoya Journal of Medical Science
https://www.readbyqxmd.com/read/28293438/neuroplasticity-changes-on-human-motor-cortex-induced-by-acupuncture-therapy-a-preliminary-study
#16
Yi Yang, Ines Eisner, Siqi Chen, Shaosong Wang, Fan Zhang, Linpeng Wang
While neuroplasticity changes measured by transcranial magnetic stimulation have been proved to be highly correlated to motor recovery and have been tested in various forms of interventions, it has not been applied to investigate the neurophysiologic mechanism of acupuncture therapy. The aim of this study is to investigate neuroplasticity changes induced by a single session of acupuncture therapy in healthy adults, regarding the excitability change on bilateral primary motor cortex and interhemispheric inhibition...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28290507/inhibitory-interneuron-circuits-at-cortical-and-spinal-levels-are-associated-with-individual-differences-in-corticomuscular-coherence-during-isometric-voluntary-contraction
#17
Ryosuke Matsuya, Junichi Ushiyama, Junichi Ushiba
Corticomuscular coherence (CMC) is an oscillatory synchronization of 15-35 Hz (β-band) between electroencephalogram (EEG) of the sensorimotor cortex and electromyogram of contracting muscles. Although we reported that the magnitude of CMC varies among individuals, the physiological mechanisms underlying this variation are still unclear. Here, we aimed to investigate the associations between CMC and intracortical inhibition (ICI) in the primary motor cortex (M1)/recurrent inhibition (RI) in the spinal cord, which probably affect oscillatory neural activities...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28289648/diagnostic-challenge-of-diffusion-tensor-imaging-in-a-patient-with-hemiplegia-after-traumatic-brain-injury
#18
Hye Eun Shin, Hoon Chang Suh, Si Hyun Kang, Kyung Mook Seo, Don-Kyu Kim, Hae-Won Shin
A 51-year-old man showed hemiplegia on his right side after a traumatic brain injury (TBI). On initial brain computed tomography (CT) scan, an acute subdural hemorrhage in the right cerebral convexity and severe degrees of midline shifting and subfalcine herniation to the left side were evident. On follow-up brain magnetic resonance imaging (MRI), there were multiple microhemorrhages in the left parietal and occipital subcortical regions. To explain the occurrence of right hemiplegia after brain damage which dominantly on the right side of brain, we used diffusion tensor imaging (DTI) to reconstruct the corticospinal tract (CST), which showed nearly complete injury on the left CST...
February 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/28289399/auditory-and-vestibular-evoked-potentials-correlate-with-motor-and-non-motor-features-of-parkinson-s-disease
#19
Ali Soliman Shalash, Dalia Mohamed Hassan, Hanan Hani Elrassas, Mohamed Mosaad Salama, Edna Méndez-Hernández, José M Salas-Pacheco, Oscar Arias-Carrión
Degeneration of several brainstem nuclei has been long related to motor and non-motor symptoms (NMSs) of Parkinson's disease (PD). Nevertheless, due to technical issues, there are only a few studies that correlate that association. Brainstem auditory-evoked potential (BAEP) and vestibular-evoked myogenic potential (VEMP) responses represent a valuable tool for brainstem assessment. Here, we investigated the abnormalities of BAEPs, ocular VEMPs (oVEMPs), and cervical VEMPs (cVEMPs) in patients with PD and its correlation to the motor and NMSs...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28286677/motor-recovery-of-the-affected-hand-in-subacute-stroke-correlates-with-changes-of-contralesional-cortical-hand-motor-representation
#20
Jitka Veldema, Kathrin Bösl, Dennis Alexander Nowak
Objective. To investigate the relationship between changes of cortical hand motor representation and motor recovery of the affected hand in subacute stroke. Methods. 17 patients with motor impairment of the affected hand were enrolled in an in-patient neurological rehabilitation program. Hand motor function tests (Wolf Motor Function Test, Action Research Arm Test) and neurophysiological evaluations (resting motor threshold, motor evoked potentials, motor map area size, motor map area volume, and motor map area location) were obtained from both hands and hemispheres at baseline and two, four, and six weeks of in-patient rehabilitation...
2017: Neural Plasticity
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