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Somatosensory Evoked Potentials

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https://www.readbyqxmd.com/read/27909403/cortical-sensorimotor-processing-of-painful-pressure-in-patients-with-chronic-lower-back-pain-an-optical-neuroimaging-study-using-fnirs
#1
Andrea Vrana, Michael L Meier, Sabina Hotz-Boendermaker, Barry K Humphreys, Felix Scholkmann
In this study we investigated sensorimotor processing of painful pressure stimulation on the lower back of patients with chronic lower back pain (CLBP) by using functional near-infrared spectroscopy (fNIRS) to measure changes in cerebral hemodynamics and oxygenation. The main objectives were whether patients with CLBP show different relative changes in oxy- and deoxyhemoglobin ([O2Hb] and [HHb]) in the supplementary motor area (SMA) and primary somatosensory cortex (S1) compared to healthy controls (HC). Twelve patients with CLBP (32 ± 6...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27903814/blink-associated-contralateral-eccentric-saccades-as-a-rare-sign-of-unilateral-brain-injury
#2
Ilaria Zivi, Eugenio Bertelli, Giacinta Bilotti, Ignazio Alessandro Clemente, Leopold Saltuari, Giuseppe Frazzitta
OBJECTIVE: To describe a rare sign of unilateral brain injury as a form of unwanted blink-associated contralateral eccentric saccades. METHODS: A 62-year-old patient who underwent an ischemic stroke affecting the entire right middle cerebral artery territory came to our attention 1 year after stroke, manifesting with transient contralateral conjugate gaze deviations associated with spontaneous blinking. We complemented the regular neurologic evaluation with brain MRI, study of evoked potentials, electroneurography of the facial nerve, and infrared video-oculoscopy...
November 30, 2016: Neurology
https://www.readbyqxmd.com/read/27874946/visual-and-somotosensory-evoked-potentials-in-asymptomatic-patients-with-vitamin-b12-deficiency
#3
B Gökçe Çokal, H N Güneş, S K Güler, T K Yoldaş
OBJECTIVE: Vitamin B12 deficiency may be asymptomatic or present with a wide range of neurological and hematological disorders. Our aim in this study is to evaluate visual (VEP) and somatosensory evoked potential (SEP) parameters in patients with vitamin B12 deficiency who had no clinical evidence of visual impairment or neurological syndrome findings and compare the findings with healthy controls to determine whether there is a correlation between VEP and SEP parameters and serum vitamin B12 levels...
November 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27861715/the-value-of-the-bulbocavernosus-reflex-and-pudendal-nerve-somatosensory-evoked-potentials-in-distinguishing-between-multiple-system-atrophy-and-parkinson-s-disease-at-an-early-stage
#4
Z-Y Cai, X-T Niu, J Pan, P-Q Ni, X Wang, B Shao
OBJECTIVES: This study was designed to investigate the clinical value of the bulbocavernosus reflex (BCR) and pudendal nerve somatosensory evoked potentials (PSEPs) in the differential diagnosis between multiple system atrophy (MSA) and Parkinson's disease (PD) in early stage. MATERIALS AND METHODS: A total of 31 patients with MSA, 45 patients with PD, and 60 healthy participants were included in this study. A Keypoint EMG/EP system was used for BCR and PSEP measurements...
November 10, 2016: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/27861447/diagnostic-accuracy-of-neuromonitoring-for-identification-of-new-neurologic-deficits-in-pediatric-spinal-fusion-surgery
#5
Victor M Neira, Kamyar Ghaffari, Srinivas Bulusu, Paul J Moroz, James G Jarvis, Nicholas Barrowman, William Splinter
BACKGROUND: Intraoperative neuromonitoring (IONM) modalities, transcranial motor-evoked potentials (TcMEPs), and somatosensory-evoked potentials (SSEPs) are accepted methods to identify impending spinal cord injury during spinal fusion surgery. Debate exists over sensitivity and specificity of these modalities. Our purpose was to measure the incidence of new neurologic deficits (NNDs) and estimate sensitivity and specificity of IONM modalities. METHODS: Institutional Ethics Board approval was obtained to review charts of patients younger than 22 years undergoing scoliosis surgery from 2007 to 2014 retrospectively...
December 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27847865/in-vivo-characterization-of-distinct-modality-specific-subsets-of-somatosensory-neurons-using-gcamp
#6
Edward C Emery, Ana P Luiz, Shafaq Sikandar, Rán Magnúsdóttir, Xinzhong Dong, John N Wood
Mechanistic insights into pain pathways are essential for a rational approach to treating this vast and increasing clinical problem. Sensory neurons that respond to tissue damage (nociceptors) may evoke pain sensations and are typically classified on the basis of action potential velocity. Electrophysiological studies have suggested that most of the C-fiber nociceptors are polymodal, responding to a variety of insults. In contrast, gene deletion studies in the sensory neurons of transgenic mice have frequently resulted in modality-specific deficits...
November 2016: Science Advances
https://www.readbyqxmd.com/read/27844034/neural-coupling-of-cooperative-hand-movements-after-stroke-role-of-ipsilateral-afference
#7
Miriam Schrafl-Altermatt, Volker Dietz
We investigated the role of ipsilateral ascending pathways in the neural coupling underlying cooperative hand movements of stroke subjects. Ipsi- and contralateral somatosensory evoked potentials (SSEP) were recorded following ulnar nerve stimulation during cooperative and non-cooperative hand movements. The amplitude ratio, that is, ipsilateral divided by contralateral amplitude, was highest during the cooperative task when the affected arm was stimulated, reflecting an enhanced afferent volley to the unaffected hemisphere...
November 2016: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/27836649/sensory-detection-of-threshold-intensity-resistive-loads-in-severe-obstructive-sleep-apnoea
#8
Warren R Ruehland, Peter D Rochford, Robert J Pierce, Kate E Webster, John A Trinder, Amy S Jordan, Fergal J O'Donoghue
Respiratory related evoked potentials (RREPs) were used to investigate whether sensory detection of small mid-inspiratory resistive loads (≈1.2-6.2 cmH2OL(-1)s), delivered during wakefulness, was impaired in obstructive sleep apnoea (OSA). It was reasoned that impaired detection of minor airway patency challenge may lead to difficult-to-remedy further collapse. There was a significant reduction in OSA (n=16) vs. control (n=17) participants in the slope of the relationship between the P1 RREP component amplitude, which reflects arrival of somatosensory information at the cortex, and stimulus intensity, expressed as change in epiglottic pressure (mean [95% confidence intervals]: -0...
November 9, 2016: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/27830579/sleep-disordered-breathing-in-children-with-achondroplasia
#9
REVIEW
Marco Zaffanello, Gaetano Cantalupo, Giorgio Piacentini, Emma Gasperi, Luana Nosetti, Paolo Cavarzere, Diego Alberto Ramaroli, Aliza Mittal, Franco Antoniazzi
BACKGROUND: Children with achondroplasia often have breathing problems, especially during sleep. The most important treatments are adenotonsillectomy (for treating upper obstruction) and/or neurosurgery (for resolving cervicomedullar junction stenosis). DATA SOURCES: We reviewed the scientific literature on polysomnographic investigations which assessed the severity of respiratory disorders during sleep. RESULTS: Recent findings have highlighted the importance of clinical investigations in patients with achondroplasia, differentiating between those that look for neurological patterns and those that look for respiratory problems during sleep...
November 3, 2016: World Journal of Pediatrics: WJP
https://www.readbyqxmd.com/read/27822509/peripheral-neuropathy-in-patients-with-cpeo-associated-with-single-and-multiple-mtdna-deletions
#10
Diana Lehmann, Malte E Kornhuber, Carolina Clajus, Charlotte L Alston, Andreas Wienke, Marcus Deschauer, Robert W Taylor, Stephan Zierz
OBJECTIVE: To characterize peripheral nerve involvement in patients with chronic progressive external ophthalmoplegia (CPEO) with single and multiple mitochondrial DNA (mtDNA) deletions, based on clinical scores and detailed nerve conduction studies. METHODS: Peripheral nerve involvement was prospectively investigated in 33 participants with CPEO (single deletions n = 18 and multiple deletions n = 15). Clinically, a modified Total Neuropathy Score (mTNS) and a modified International Cooperative Ataxia Rating Scale (mICARS) were used...
December 2016: Neurology. Genetics
https://www.readbyqxmd.com/read/27808426/venlafaxine-and-oxycodone-have-different-effects-on-spinal-and-supra-spinal-activity-in-man-a-somatosensory-evoked-potential-study
#11
Dina Lelic, Massimiliano Valeriani, Iben W D Fischer, Albert Dahan, Asbjørn M Drewes
INTRODUCTION: Opioids and antidepressants that inhibit serotonin and norepinephrine reuptake (SNRI) are recognized as analgesics to treat severe and moderate pain, but for both of them the mechanisms in humans remain unclear. This study aimed to explore how oxycodone (opioid) and venlafaxine (SNRI) modulate spinal and supraspinal sensory processing. METHODS: Twenty volunteers were included in this randomized, double blinded, three-way (placebo, oxycodone, venlafaxine), cross-over study...
November 3, 2016: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/27803403/impaired-pain-processing-correlates-with-cognitive-impairment-in-parkinson-s-disease
#12
Akinori Okada, Tomohiko Nakamura, Junichiro Suzuki, Masashi Suzuki, Masaaki Hirayama, Masahisa Katsuno, Gen Sobue
Objective Pain and cognitive impairment are important clinical features in patients with Parkinson's disease (PD). Although pain processing is associated with the limbic system, which is also closely linked to the cognitive function, the association between pain and cognitive impairment in PD is still not well understood. The aim of the study was to investigate the association between pain processing and cognitive impairment in patients with PD. Methods Forty-three patients with PD and 22 healthy subjects were studied...
2016: Internal Medicine
https://www.readbyqxmd.com/read/27799904/are-there-abnormalities-in-peripheral-and-central-components-of-somatosensory-evoked-potentials-in-non-specific-chronic-low-back-pain
#13
Christian Puta, Marcel Franz, Kathrin R Blume, Holger H W Gabriel, Wolfgang H R Miltner, Thomas Weiss
Chronic low back pain (CLBP) was shown to be associated with longer reflex response latencies of trunk muscles during external upper limb perturbations. One theoretical, but rarely investigated possibility for longer reflex latencies might be related to modulated somatosensory information processing. Therefore, the present study investigated somatosensory evoked potentials (SEPs) to median nerve stimulation in CLBP patients and healthy controls (HC). Latencies of the peripheral N9 SEP component were used as the primary outcome...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27798186/genetically-targeted-all-optical-electrophysiology-with-a-transgenic-cre-dependent-optopatch-mouse
#14
Shan Lou, Yoav Adam, Eli N Weinstein, Erika Williams, Katherine Williams, Vicente Parot, Nikita Kavokine, Stephen Liberles, Linda Madisen, Hongkui Zeng, Adam E Cohen
: Recent advances in optogenetics have enabled simultaneous optical perturbation and optical readout of membrane potential in diverse cell types. Here, we develop and characterize a Cre-dependent transgenic Optopatch2 mouse line that we call Floxopatch. The animals expressed a blue-shifted channelrhodopsin, CheRiff, and a near infrared Archaerhodopsin-derived voltage indicator, QuasAr2, via targeted knock-in at the rosa26 locus. In Optopatch-expressing animals, we tested for overall health, genetically targeted expression, and function of the optogenetic components...
October 26, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27798135/physiological-and-perceptual-sensory-attenuation-have-different-underlying-neurophysiological-correlates
#15
Clare E Palmer, Marco Davare, James M Kilner
: Sensory attenuation, the top-down filtering or gating of afferent information, has been extensively studied in two fields: physiological and perceptual. Physiological sensory attenuation is represented as a decrease in the amplitude of the primary and secondary components of the somatosensory evoked potential (SEP) before and during movement. Perceptual sensory attenuation, described using the analogy of a persons' inability to tickle oneself, is a reduction in the perception of the afferent input of a self-produced tactile sensation due to the central cancellation of the reafferent signal by the efference copy of the motor command to produce the action...
October 19, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27797835/the-development-of-nociceptive-network-activity-in-the-somatosensory-cortex-of-freely-moving-rat-pups
#16
P Chang, L Fabrizi, S Olhede, M Fitzgerald
Cortical perception of noxious stimulation is an essential component of pain experience but it is not known how cortical nociceptive activity emerges during brain development. Here we use continuous telemetric electrocorticogram (ECoG) recording from the primary somatosensory cortex (S1) of awake active rat pups to map functional nociceptive processing in the developing brain over the first 4 weeks of life. Cross-sectional and longitudinal recordings show that baseline S1 ECoG energy increases steadily with age, with a distinctive beta component replaced by a distinctive theta component in week 3...
October 26, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27794631/effects-of-different-exercise-modalities-on-ataxia-in-multiple-sclerosis-patients-a-randomized-controlled-study
#17
Yeliz Salcı, Ayla Fil, Kadriye Armutlu, F Gökçem Yildiz, Aslı Kurne, Songül Aksoy, Gülay Nurlu, Rana Karabudak
PURPOSE: To investigate the effects of different exercise protocols on ataxia in patients with multiple sclerosis (MS). METHOD: A total of 42 MS patients, 17 male and 25 female (Expanded Disability Status Scale (EDSS): 3-5), were enrolled in this randomized controlled study. The patients were divided into three groups: a balance training (BT) group, a lumbar stabilization (LS) group and a task-oriented training (TT) group. All groups received balance training; additionally, the LS group received lumbar stabilization exercises, and the TT group received task-oriented training...
October 29, 2016: Disability and Rehabilitation
https://www.readbyqxmd.com/read/27792108/efficacy-of-intraoperative-neurophysiologic-monitoring-for-pediatric-cervical-spine-surgery
#18
Daniel G Tobert, Michael P Glotzbecker, M Timothy Hresko, Lawrence I Karlin, Mark R Proctor, John B Emans, Patricia E Miller, Daniel J Hedequist
STUDY DESIGN: Clinical case series OBJECTIVE.: To investigate the efficacy of intraoperative neuromonitoring in pediatric cervical spine surgery SUMMARY OF BACKGROUND DATA.: Intraoperative neuromonitoring (IONM) consisting of somatosensory evoked potentials (SSEP) and transcranial motor evoked potentials (tcMEP) has been shown to effectively prevent permaneny neurologic injury in deformity surgery. The role of IONM during pediatric cervical spine surgery is not well documented. Advances in cervical spine instrumentation have expanded the surgical options in pediatric populations...
October 25, 2016: Spine
https://www.readbyqxmd.com/read/27788124/a-hybrid-three-class-brain-computer-interface-system-utilizing-ssseps-and-transient-erps
#19
Christian Breitwieser, Christoph Pokorny, Gernot R Müller-Putz
OBJECTIVE: This paper investigates the fusion of steady-state somatosensory evoked potentials (SSSEPs) and transient event-related potentials (tERPs), evoked through tactile simulation on the left and right-hand fingertips, in a three-class EEG based hybrid brain-computer interface. It was hypothesized, that fusing the input signals leads to higher classification rates than classifying tERP and SSSEP individually. APPROACH: Fourteen subjects participated in the studies, consisting of a screening paradigm to determine person dependent resonance-like frequencies and a subsequent online paradigm...
December 2016: Journal of Neural Engineering
https://www.readbyqxmd.com/read/27782355/pain-processing-abnormalities-in-bipolar-i-disorder-bipolar-ii-disorder-and-schizophrenia-a-novel-trait-marker-for-psychosis-proneness-and-functional-outcome
#20
Amedeo Minichino, Roberto Delle Chiaie, Giorgio Cruccu, Serena Piroso, Giulia Di Stefano, Marta Francesconi, Francesco Saverio Bersani, Massimo Biondi, Andrea Truini
OBJECTIVES: Overlapping neural system dysfunctions, mainly involving the secondary somatosensory cortex (S2), the anterior cingulate cortex (ACC) and the anterior insular cortex (AIC), seem to be related to both pain-perception abnormalities and psychotic symptoms in schizophrenia (SCZ) and bipolar disorder (BD). Laser-evoked potentials (LEPs) were used to investigate pain-perception and central pain-processing abnormalities in SCZ, bipolar I disorder (BD-I), and bipolar II disorder (BD-II), and to evaluate their relationship with history of psychosis, and social-cognitive and functional impairments...
November 2016: Bipolar Disorders
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