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Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology

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https://www.readbyqxmd.com/read/28646743/analysis-of-ictal-magnetoencephalography-using-gradient-magnetic-field-topography-gmft-in-patients-with-neocortical-epilepsy
#1
Hiroshi Shirozu, Akira Hashizume, Hiroshi Masuda, Yosuke Ito, Yoko Nakayama, Takefumi Higashijima, Masafumi Fukuda, Shigeki Kameyama
OBJECTIVE: We aimed to validate the usefulness of gradient magnetic-field topography (GMFT) for analysis of ictal magnetoencephalography (MEG) in patients with neocortical epilepsy. METHODS: We identified 13 patients presenting with an ictal event during preoperative MEG. We applied equivalent current dipole (ECD) estimation and GMFT to detect and localize the ictal MEG onset, and compared these methods with the ictal onset zone (IOZ) derived from chronic intracranial electroencephalography...
June 7, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28629644/need-for-updating-safety-recommendations-on-repetitive-transcranial-magnetic-stimulation-in-stroke-patients
#2
LETTER
Bertrand Glize, Dominique Guehl, Mélanie Cogné
No abstract text is available yet for this article.
June 3, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28622529/automatic-multimodal-detection-for-long-term-seizure-documentation-in-epilepsy
#3
F Fürbass, S Kampusch, E Kaniusas, J Koren, S Pirker, R Hopfengärtner, H Stefan, T Kluge, C Baumgartner
OBJECTIVE: This study investigated sensitivity and false detection rate of a multimodal automatic seizure detection algorithm and the applicability to reduced electrode montages for long-term seizure documentation in epilepsy patients. METHODS: An automatic seizure detection algorithm based on EEG, EMG, and ECG signals was developed. EEG/ECG recordings of 92 patients from two epilepsy monitoring units including 494 seizures were used to assess detection performance...
May 25, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28629643/reduced-electrode-arrays-for-acute-electroencephalography-can-less-be-more
#4
EDITORIAL
Kenneth G Jordan
No abstract text is available yet for this article.
May 23, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28622528/band-specific-atypical-functional-connectivity-pattern-in-childhood-autism-spectrum-disorder
#5
Tetsuya Takahashi, Teruya Yamanishi, Sou Nobukawa, Shinya Kasakawa, Yuko Yoshimura, Hirotoshi Hiraishi, Chiaki Hasegawa, Takashi Ikeda, Tetsu Hirosawa, Toshio Munesue, Haruhiro Higashida, Yoshio Minabe, Mitsuru Kikuchi
OBJECTIVE: Altered brain connectivity has been theorized as a key neural underpinning of autism spectrum disorder (ASD), but recent investigations have revealed conflicting patterns of connectivity, particularly hyper-connectivity and hypo-connectivity across age groups. The application of graph theory to neuroimaging data has become an effective approach for characterizing topographical patterns of large-scale functional networks. We used a graph approach to investigate alteration of functional networks in childhood ASD...
May 23, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28618291/immune-mediated-neuropathies-role-of-single-fiber-conduction-velocity
#6
LETTER
Daniele Coraci, Carmen Erra, Valter Santilli, Luca Padua
No abstract text is available yet for this article.
May 23, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28622527/alzheimer-s-disease-the-state-of-the-art-in-resting-state-magnetoencephalography
#7
REVIEW
M M A Engels, W M van der Flier, C J Stam, A Hillebrand, Ph Scheltens, E C W van Straaten
Alzheimer's disease (AD) is accompanied by functional brain changes that can be detected in imaging studies, including electromagnetic activity recorded with magnetoencephalography (MEG). Here, we systematically review the studies that have examined resting-state MEG changes in AD and identify areas that lack scientific or clinical progress. Three levels of MEG analysis will be covered: (i) single-channel signal analysis, (ii) pairwise analyses over time series, which includes the study of interdependencies between two time series and (iii) global network analyses...
May 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28618295/phase-locked-and-non-phase-locked-eeg-responses-to-pinprick-stimulation-before-and-after-experimentally-induced-secondary-hyperalgesia
#8
Emanuel N van den Broeke, Bart de Vries, Julien Lambert, Diana M Torta, André Mouraux
OBJECTIVE: Pinprick-evoked brain potentials (PEPs) have been proposed as a technique to investigate secondary hyperalgesia and central sensitization in humans. However, the signal-to-noise (SNR) of PEPs is low. Here, using time-frequency analysis, we characterize the phase-locked and non-phase-locked EEG responses to pinprick stimulation, before and after secondary hyperalgesia. METHODS: Secondary hyperalgesia was induced using high-frequency electrical stimulation (HFS) of the left/right forearm skin in 16 volunteers...
May 19, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28618294/focused-high-resolution-sonography-of-the-suprascapular-nerve-a-simple-surrogate-marker-for-neuralgic-amyotrophy
#9
Leonhard Gruber, Alexander Loizides, Wolfgang Löscher, Bernhard Glodny, Hannes Gruber
OBJECTIVES: To define the diagnostic value of high-resolution ultrasound (HRUS) of the suprascapular nerve (SSN) in the diagnosis of neuralgic amyotrophy (NA). METHODS: The cross-section areas (CSA) of the SSN at the C5 root (CSA1) and the omohyoid muscle in the midclavicular line (CSA2) were assessed bilaterally in 15 healthy volunteers and 14 patients with clinically and electrophysiologically verified NA. Receiver-operator-characteristics (ROC) curves were generated and cut-off values, sensitivity, specificity, positive (PPV) and negative predictive values (NPV), likelihood (LR) and odds ratios (OR) were calculated...
May 19, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28628797/attenuated-error-related-potentials-in-amyotrophic-lateral-sclerosis-with-executive-dysfunctions
#10
Caroline Seer, Max Joop, Florian Lange, Christian Lange, Reinhard Dengler, Susanne Petri, Bruno Kopp
OBJECTIVE: Executive dysfunctions affect up to 50% of the patients with amyotrophic lateral sclerosis (ALS). Executive dysfunctions have been identified as negative prognostic factor and can affect quality of life in patients and their caregivers. Assessment of executive dysfunction may be impeded by the patients' motor impairments. Event-related potentials (ERP) have been proposed as a tool to overcome these assessment difficulties. The error(-related) negativity (Ne/ERN) is an ERP which can be recorded with minimal motor requirements for the patient...
May 18, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28618292/influence-of-transcutaneous-spinal-stimulation-on-human-ltp-like-pain-amplification-a-randomized-double-blind-study-in-volunteers
#11
L M Schweizer, P K Zahn, E M Pogatzki-Zahn, W Magerl, M Tegenthoff, C H Meyer-Frießem
OBJECTIVE: Transcutaneous spinal direct current stimulation (tsDCS) has been proven to affect nociceptive signal processing. We designed a randomized, double-blind, cross-over study to investigate whether tsDCS applied before or after inducing long-term potentiation-(LTP)-like hyperalgesia may decrease nociceptive sensitivity. METHODS: In healthy volunteers, tsDCS (2.5mA, 15min) was applied to the thoracic spine prior (n=14) or immediately following (n=12) electrical high-frequency stimulation (HFS) to the thigh, inducing hyperalgesia...
May 18, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28624492/cortical-function-and-corticomotoneuronal-adaptation-in-monomelic-amyotrophy
#12
José Manuel Matamala, Nimeshan Geevasinga, William Huynh, Thanuja Dharmadasa, James Howells, Neil G Simon, Parvathi Menon, Steve Vucic, Matthew C Kiernan
OBJECTIVE: To evaluate corticomotoneuronal integrity in monomelic amyotrophy using threshold tracking transcranial magnetic stimulation (TT-TMS). METHODS: Cortical excitability studies were prospectively performed in 8 monomelic amyotrophy patients and compared to 21 early-onset amyotrophic lateral sclerosis (ALS) patients and 40 healthy controls. Motor evoked potentials responses were recorded over abductor pollicis brevis. RESULTS: Maximal motor evoked potential (MEP/CMAP ratio) was significantly increased in monomelic amyotrophy compared with controls (monomelic amyotrophy 51...
May 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28623066/association-of-posterior-semicircular-canal-hypofunction-on-video-head-impulse-testing-with-other-vestibulo-cochlear-deficits
#13
Alexander A Tarnutzer, Christopher J Bockisch, Elena Buffone, Konrad P Weber
OBJECTIVES: The video-head-impulse test (vHIT) provides a functional assessment of all six semicircular canals (SCC). Occasionally isolated loss of the posterior canal(s) (ILPC) is diagnosed, though this finding is poorly characterized. Here we assessed how accurate that diagnosis is by measuring the co-occurrence of abnormalities on caloric irrigation, vestibular-evoked myogenic-potentials and audiometry. METHODS: We identified 52 patients with ILPC (unilateral=40, bilateral=12)...
May 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28622530/brain-network-dynamics-in-the-human-articulatory-loop
#14
Masaaki Nishida, Anna Korzeniewska, Nathan E Crone, Goichiro Toyoda, Yasuo Nakai, Noa Ofen, Erik C Brown, Eishi Asano
OBJECTIVE: The articulatory loop is a fundamental component of language function, involved in the short-term buffer of auditory information followed by its vocal reproduction. We characterized the network dynamics of the human articulatory loop, using invasive recording and stimulation. METHODS: We measured high-gamma activity70-110 Hz recorded intracranially when patients with epilepsy either only listened to, or listened to and then reproduced two successive tones by humming...
May 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28618293/pilot-prospective-study-of-post-surgery-sleep-and-eeg-predictors-of-post-operative-delirium
#15
Joanna L Evans, Jacob W Nadler, Xavier A Preud'homme, Eric Fang, Rommie L Daughtry, Joseph B Chapman, David Attarian, Samuel Wellman, Andrew D Krystal
OBJECTIVE: Delirium is a common post-operative complication associated with significant costs, morbidity, and mortality. We sought sleep/EEG predictors of delirium present prior to delirium symptoms to facilitate developing and targeting therapies. METHODS: Continuous EEG data were obtained in 12 patients post-orthopedic surgery from the day of surgery until delirium assessment on post-operative day 2 (POD2). RESULTS: Diminished total sleep time (r=-0...
May 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28571910/alzheimer-s-disease-disrupts-alpha-and-beta-band-resting-state-oscillatory-network-connectivity
#16
Loes Koelewijn, Aline Bompas, Andrea Tales, Matthew J Brookes, Suresh D Muthukumaraswamy, Antony Bayer, Krish D Singh
OBJECTIVE: Neuroimaging studies in Alzheimer's disease (AD) yield conflicting results due to selective investigation. We conducted a comprehensive magnetoencephalography study of connectivity changes in AD and healthy ageing in the resting-state. METHODS: We performed a whole-brain, source-space assessment of oscillatory neural signalling in multiple frequencies comparing AD patients, elderly and young controls. We compared eyes-open and closed group oscillatory envelope activity in networks obtained through temporal independent component analysis, and calculated whole-brain node-based amplitude and phase connectivity...
May 8, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28501415/reduced-electrode-arrays-for-the-automated-detection-of-rhythmic-and-periodic-patterns-in-the-intensive-care-unit-frequently-tried-frequently-failed
#17
J Herta, J Koren, F Fürbass, M Hartmann, A Gruber, C Baumgartner
OBJECTIVE: To investigate the effect of systematic electrode reduction from a common 10-20 EEG system on pattern detection sensitivity (SEN). METHODS: Two reviewers rated 17130 one-minute segments of 83 prospectively recorded cEEGs according to the ACNS standardized critical care EEG terminology (CCET), including burst suppression patterns (BS) and unequivocal electrographic seizures. Consensus annotations between reviewers were used as a gold standard to determine pattern detection SEN and specificity (SPE) of a computational algorithm (baseline, 19 electrodes)...
April 26, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28571911/a-spotlight-on-intraoperative-neurophysiological-monitoring-of-the-lower-brainstem
#18
EDITORIAL
Francesco Sala
No abstract text is available yet for this article.
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28570868/fractional-amplitude-of-low-frequency-fluctuations-is-disrupted-in-alzheimer-s-disease-with-depression
#19
Zhongwei Guo, Xiaozheng Liu, Jiapeng Li, Fuquan Wei, Hongtao Hou, Xingli Chen, Xinwei Li, Wei Chen
OBJECTIVE: To explore brain activity in AD with depression (D-AD) based on fractional amplitude of low-frequency fluctuation (fALFF). METHODS: Twenty-two D-AD and 21 AD without depression patients (nD-AD) were examined by magnetic resonance imaging during resting state. Neuropsychiatric Inventory and Hamilton Depression Rating Scale were employed to assess the severity of depression. We analysed the characteristics of fALFF in D-AD differing from nD-AD. We also examined the correlation between fALFF and the depression severity...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28570867/evoked-potentials-recorded-during-routine-eeg-predict-outcome-after-perinatal-asphyxia
#20
Päivi Nevalainen, Viviana Marchi, Marjo Metsäranta, Tuula Lönnqvist, Sanna Toiviainen-Salo, Sampsa Vanhatalo, Leena Lauronen
OBJECTIVE: To evaluate the added value of somatosensory (SEPs) and visual evoked potentials (VEPs) recorded simultaneously with routine EEG in early outcome prediction of newborns with hypoxic-ischemic encephalopathy under modern intensive care. METHODS: We simultaneously recorded multichannel EEG, median nerve SEPs, and flash VEPs during the first few postnatal days in 50 term newborns with hypoxic-ischemic encephalopathy. EEG background was scored into five grades and the worst two grades were considered to indicate poor cerebral recovery...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
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