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Laser evoked potentials

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https://www.readbyqxmd.com/read/29228247/a-randomized-double-blind-placebo-and-active-comparator-controlled-phase-i-study-of-analgesic-antihyperalgesic-properties-of-asp8477-a-fatty-acid-amide-hydrolase-inhibitor-in-healthy-female-subjects
#1
Klaus Schaffler, Ashraf Yassen, Peter Reeh, Paul Passier
Objectives: To evaluate the analgesic/antihyperalgesic effect of ASP8477. Design: Randomized, double-blind, double-dummy, cross-over, placebo- and active comparator-controlled study. Setting: HPR Dr. Schaffler GmbH, Munich, Germany. Subjects: Healthy female subjects aged 18-65 years. Methods: Eligible subjects were randomly assigned to one of six treatment sequences and received multiple ascending doses of ASP8477, duloxetine, and placebo over three treatment periods (each consisting of 21-day dosing separated by 14-day washout periods)...
December 8, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29201002/a-comparison-of-different-slicing-planes-in-preservation-of-major-hippocampal-pathway-fibers-in-the-mouse
#2
Guoxiang Xiong, Hannah Metheny, Brian N Johnson, Akiva S Cohen
The hippocampus plays a critical role in learning and memory and higher cognitive functions, and its dysfunction has been implicated in various neuropathological disorders. Electrophysiological recording undertaken in live brain slices is one of the most powerful tools for investigating hippocampal cellular and network activities. The plane for cutting the slices determines which afferent and/or efferent connections are best preserved, and there are three commonly used slices: hippocampal-entorhinal cortex (HEC), coronal and transverse...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29184706/cervical-intramedullary-spinal-cord-lipoma
#3
Rocco Severino, Paolo Severino
Background: Intramedullary, nondysraphic, spinal cord lipomas are rare and account for less than 1% of all spinal cord lesions. Symptoms typically consist of a progressive myelopathy associated with increasing degrees of paralysis (e.g., quadriparesis/plegia, paraparesis/plegia). Case Description: A 39-year-old male, without a history of spinal dysraphism, presented with a progressive spastic quadriparesis. This was attributed to magnetic resonance-documented large intramedullary cervical lipoma...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/29172994/amiloride-does-not-protect-retinal-nerve-fibre-layer-thickness-in-optic-neuritis-in-a-phase-2-randomised-controlled-trial
#4
Justin B McKee, Charles L Cottriall, John Elston, Simon Epps, Nikos Evangelou, Stephen Gerry, Christopher Kennard, Yazhuo Kong, Abigail Koelewyn, Wilhelm Kueker, Maria Isabel Leite, Jacqueline Palace, Matthew Craner
BACKGROUND: Recent basic and clinical evidence suggests amiloride may be neuroprotective in multiple sclerosis (MS) through the blockade of the acid sensing ion channel (ASIC). OBJECTIVE: To examine the neuroprotective efficacy of amiloride in acute optic neuritis (ON). METHODS: A total of 48 patients were recruited to a phase 2, double blind, single site, randomised controlled trial. Scanning laser polarimetry (GDx) at 6 months was the primary outcome measure and optical coherence tomography (OCT) and visual and electrophysiological measures were secondary outcome measures...
November 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/29156922/changes-in-laser-evoked-potentials-during-hypnotic-analgesia-for-chronic-pain-a-pilot-study
#5
Giovanna Squintani, Maria P Brugnoli, Emanuela Pasin, Alessia Segatti, Elisa Concon, Enrico Polati, Bruno Bonetti, Angela Matinella
BACKGROUND: Hypnotic analgesia is one of the most effective nonpharmacological methods for pain control. Hypnosis and distraction of attention from pain might share similar mechanisms by which brain responses to painful stimulation could be similarly reduced in both states. There is ample evidence for the efficacy of clinical hypnosis as a psychological intervention in the treatment of acute or chronic pain. Results are conflicting, however, with some studies showing an increase, others a reduction, and others still no change in the amplitude of event-related brain potentials during hypnosis as compared to control conditions...
November 10, 2017: Annals of Palliative Medicine
https://www.readbyqxmd.com/read/29154979/small-fiber-neuropathy-diagnosis-causes-and-treatment
#6
Damien Sène
Small fiber neuropathy, which affects the sensory A≏ and C fibers, is now a major diagnostic and therapeutic challenge. Nearly 7% of the general population have chronic neuropathic pain responsible for severe quality-of-life impairments. Awareness must therefore be raised among clinicians of the somatosensory and autonomic symptoms that can reveal small fiber neuropathy, appropriate diagnostic investigations, most common causes, and best treatment options for each patient profile. To help achieve this goal, the present review article discusses the clinical presentation of neuropathic pain and paresthesia and/or autonomic dysfunction due to involvement of nerves supplying exocrine glands and smooth muscle; normal findings from standard electrophysiological investigations; most informative diagnostic tests (epidermal nerve fiber density in a skin biopsy, laser-evoked potentials, heat- and cold-detection thresholds, electrochemical skin conductance); main causes, which consist chiefly of metabolic diseases (diabetes mellitus, glucose intolerance), dysimmunity syndromes (Sjögren's syndrome, sarcoidosis, monoclonal gammopathy), and genetic abnormalities (familial amyloidosis due to a transthyretin mutation, Fabry disease, sodium channel diseases); and the available symptomatic and etiological treatments...
November 15, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/29153256/intraoperative-force-and-electrocochleography-measurements-in-an-animal-model-of-cochlear-implantation
#7
J Lo, C Bester, A Collins, C Newbold, A Hampson, S Chambers, H Eastwood, S O'Leary
To preserve residual hearing, techniques for monitoring and reducing the effects of trauma during cochlear implant surgery are being developed. This study examines the relationships between intraoperative recordings (electrode insertion force and electrocochleography), trauma, and hearing loss after cochlear implantation. The study also evaluated the efficacy of intravenous steroids for reducing hearing loss after implantation. Thirty-two normal-hearing guinea pigs were randomly implanted with electrode arrays of differing stiffness ('hard' or 'soft')...
November 9, 2017: Hearing Research
https://www.readbyqxmd.com/read/29139226/cortical-nociceptive-processes-are-reduced-by-visual-alpha-band-entrainment-in-the-human-brain
#8
K Ecsy, C A Brown, A K P Jones
BACKGROUND: Acute noxious stimuli induce a suppression of cortical alpha activity, yet little is known about whether increasing alpha activity affects the processing of noxious stimuli. We have previously shown that visual alpha stimulation reduces experimental pain. Here, we demonstrate that increasing alpha power causes a reciprocal suppression of acute nociceptive processing. METHODS: We attempted to increase cortical alpha activity through visual entrainment at 8 Hz, 10 Hz and 12 Hz to investigate the influence on the electrophysiological pain response...
November 14, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/29129832/multiphoton-minimal-inertia-scanning-for-fast-acquisition-of-neural-activity-signals
#9
Renaud Schuck, Mary Ann Go, Stefania Garasto, Stephanie Reynolds, Pier Luigi Dragotti, Simon Schultz
OBJECTIVE: Multi-photon laser scanning microscopy provides a powerful tool for monitoring the spatiotemporal dynamics of neural circuit activity. It is, however, intrinsically a point scanning technique. Standard raster scanning enables imaging at subcellular resolution; however, acquisition rates are limited by the size of the field of view to be scanned. Recently developed scanning strategies such as Travelling Salesman Scanning (TSS) have been developed to maximize cellular sampling rate by scanning only select regions in the field of view corresponding to locations of interest such as somata...
November 13, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29117885/functional-evaluation-of-small-fiber-pathways-in-primary-restless-legs-syndrome-a%C3%AE-pathway-study
#10
Michał Fila, Mariusz Stasiołek, Adam Markiewicz, Andrzej Bogucki
STUDY OBJECTIVES: The aim of this study was to provide a neurophysiological evaluation of the function of large and small fibers, particularly the peripheral part of the thermonociceptiveAδ pathway in patients with primary restless legs syndrome (RLS). METHODS: The main evaluation was based on an analysis of the parameters of laser-evoked potentials (LEPs), N2 and P2 components, and an assessment of thermonociceptive thresholds (pain thresholds; PThs). Routine nerve conduction studies (NCS) were also performed...
November 1, 2017: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/29093972/pain-processing-and-vegetative-dysfunction-in-fibromyalgia-a-study-by-sympathetic-skin-response-and-laser-evoked-potentials
#11
Marina de Tommaso, Katia Ricci, Giuseppe Libro, Eleonora Vecchio, Marianna Delussi, Anna Montemurno, Giuseppe Lopalco, Florenzo Iannone
Background: A dysfunction of pain processing at central and peripheral levels was reported in fibromyalgia (FM). We aimed to correlate laser evoked potentials (LEPs), Sympathetic Skin Response (SSR), and clinical features in FM patients. Methods: Fifty FM patients and 30 age-matched controls underwent LEPs and SSR by the right hand and foot. The clinical evaluation included FM disability (FIQ) and severity scores (WPI), anxiety (SAS) and depression (SDS) scales, and questionnaires for neuropathic pain (DN4)...
2017: Pain Research and Treatment
https://www.readbyqxmd.com/read/29042004/quantitative-functional-mri-and-neurophysiological-markers-in-a-case-of-gerstmann-str%C3%A3-ussler-scheinker-syndrome
#12
Silvia Marino, Rosa Morabito, S De Salvo, L Bonanno, A Bramanti, P Pollicino, R Giorgianni, Placido Bramanti
Gerstmann-Sträussler-Scheinker syndrome (GSS) is an inherited autosomal dominant prion disease, caused by a codon 102 proline to leucine substitution (P102L) in the prion protein gene (PRNP). We describe the case of a 40-year-old male, affected by a slowly progressive gait disturbance, leg weakness and cognitive impairment. Genomic DNA revealed a point mutation of PRNP at codon 102, resulting in P102L, and the diagnosis of GSS was confirmed. Somatosensory evoked potentials showed alterations of principal parameters, particularly in the right upper and lower limbs...
July 2017: Functional Neurology
https://www.readbyqxmd.com/read/29032189/laser-evoked-potentials-in-painful-radiculopathy
#13
P Hüllemann, C von der Brelie, G Manthey, J Düsterhöft, A K Helmers, M Synowitz, J Gierthmühlen, R Baron
OBJECTIVE: The aims of this exploratory study were (1) to develop a standardized objective electrophysiological technique with laser-evoked potentials to assess dorsal root damage quantitatively and (2) to correlate these LEP measures with clinical parameters and sensory abnormalities (QST) in the affected dermatome. METHODS: Thirty-eight patients with painful radiculopathy and 20 healthy subjects were investigated with LEP recorded from the affected dermatome and control areas as well as with quantitative sensory testing...
September 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28972125/submillisecond-optogenetic-control-of-neuronal-firing-with-two-photon-holographic-photoactivation-of-chronos
#14
Emiliano Ronzitti, Rossella Conti, Valeria Zampini, Dimitrii Tanese, Amanda J Foust, Nathan Klapoetke, Edward S Boyden, Eirini Papagiakoumou, Valentina Emiliani
Optogenetic neuronal network manipulation promises to unravel a long-standing mystery in neuroscience: how does microcircuit activity relate causally to behavioral and pathological states? The challenge to evoke spikes with high spatial and temporal complexity necessitates further joint development of light-delivery approaches and custom opsins. Two-photon (2P) light-targeting strategies demonstrated in-depth generation of action potentials in photosensitive neurons both in vitro and in vivo, but thus far lack the temporal precision necessary to induce precisely timed spiking events...
November 1, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28971336/habituation-of-laser-evoked-potentials-by-migraine-phase-a-blinded-longitudinal-study
#15
Martin Uglem, Petter Moe Omland, Marit Stjern, Gøril Bruvik Gravdahl, Trond Sand
BACKGROUND: Migraineurs seem to have cyclic variations in cortical excitability in several neurophysiological modalities. Laser-evoked potentials (LEP) are of particular interest in migraine because LEP specifically targets pain pathways, and studies have reported different LEP-changes both between and during headaches. Our primary aim was to explore potential cyclic variations in LEP amplitude and habituation in more detail with a blinded longitudinal study design. METHODS: We compared N1 and N2P2 amplitudes and habituation between two blocks of laser stimulations to the dorsal hand, obtained from 49 migraineurs with four sessions each...
October 2, 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/28935423/a-comparison-between-the-neural-correlates-of-laser-and-electric-pain-stimulation-and-their-modulation-by-expectation
#16
E J Hird, A K P Jones, D Talmi, W El-Deredy
BACKGROUND: Pain is modulated by expectation. Event-related potential (ERP) studies of the influence of expectation on pain typically utilise laser heat stimulation to provide a controllable nociceptive-specific stimulus. Painful electric stimulation has a number of practical advantages, but is less nociceptive-specific. We compared the modulation of electric versus laser-evoked pain by expectation, and their corresponding pain-evoked and anticipatory ERPs. NEW METHOD: We developed understanding of recognised methods of laser and electric stimulation...
September 19, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28925006/evidence-based-source-modeling-of-nociceptive-cortical-responses-a-direct-comparison-of-scalp-and-intracranial-activity-in-humans
#17
Claire Bradley, Hélène Bastuji, Luis Garcia-Larrea
BACKGROUND: Source modeling of EEG traditionally relies on interplay between physiological hypotheses and mathematical estimates. We propose to optimize the process by using evidence gathered from brain imaging and intracortical recordings. METHODS: We recorded laser-evoked potentials in 18 healthy participants, using high-density EEG. Brain sources were modeled during the first second poststimulus, constraining their initial position to regions where nociceptive-related activity has been ascertained by intracranial EEG...
September 18, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28899650/micropatterned-surface-electrode-for-massive-selective-stimulation-of-intraepidermal-nociceptive-fibres
#18
Massimo Leandri, Lucio Marinelli, Antonio Siri, Luca Pellegrino
BACKGROUND: No satisfactory neurophysiological test for nociceptive afferents is available to date. Laser stimuli present risks of skin damage, whilst electrical stimulation through specially designed electrodes is not selective enough. NEW METHOD: We present a new electrode designed according to critical issues identified in preliminary computer simulations concerning electric field gradient through the skin. To provide selective stimulation the activating electric field must be limited to intraepidermal free nerve endings...
September 9, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28898491/skin-denervation-does-not-alter-cortical-potentials-to-surface-concentric-electrode-stimulation-a-comparison-with-laser-evoked-potentials-and-contact-heat-evoked-potentials
#19
S La Cesa, G Di Stefano, C Leone, A Pepe, E Galosi, F Alu, A Fasolino, G Cruccu, M Valeriani, A Truini
BACKGROUND: In the neurophysiological assessment of patients with neuropathic pain, laser evoked potentials (LEPs), contact heat evoked potentials (CHEPs) and the evoked potentials by the intraepidermal electrical stimulation via concentric needle electrode are widely agreed as nociceptive specific responses; conversely, the nociceptive specificity of evoked potentials by surface concentric electrode (SE-PREPs) is still debated. METHODS: In this neurophysiological study we aimed at verifying the nociceptive specificity of SE-PREPs...
September 12, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28865377/assessing-pain-in-patients-with-chronic-disorders-of-consciousness-are-we-heading-in-the-right-direction
#20
Antonino Naro, Placido Bramanti, Alessia Bramanti, Rocco Salvatore Calabrò
The deterioration of sensory-motor integration within the pain matrix in patients with chronic Disorders of Consciousness (DoC) is one of the principal mechanisms responsible for non-conscious pain perception. The present study aimed to assess whether the variability in the inter-peak interval (IPI) between the N2 and P2 components of laser evoked potentials (LEP) could represent an objective marker of the behavioral responsiveness to nociceptive stimulation, as measured by the Nociception Coma Scale-Revised (NCS-R), and regardless of the sensory part of pain processing...
October 2017: Consciousness and Cognition
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