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

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https://www.readbyqxmd.com/read/28226289/impact-of-volume-conducted-potential-in-interpretation-of-cortico-cortical-evoked-potential-detailed-analysis-of-high-resolution-electrocorticography-using-two-mathematical-approaches
#1
Seijiro Shimada, Naoto Kunii, Kensuke Kawai, Takeshi Matsuo, Yohei Ishishita, Kenji Ibayashi, Nobuhito Saito
OBJECTIVE: Cortico-cortical evoked potential (CCEP) has been utilized to evaluate connectivity between cortices. However, previous reports have rarely referred to the impact of volume-conducted potential (VCP) which must be a confounding factor of large potential around the stimulation site. To address this issue, we challenged the null hypothesis that VCP accounts for the majority of the recorded potential, particularly around the stimulation site. METHODS: CCEP was recorded with high-density intracranial electrodes in 8 patients with intractable epilepsy...
January 30, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28226287/to-make-a-molehill-out-of-a-mountain-an-erp-study-on-cognitive-reappraisal-of-negative-pictures-in-children-with-and-without-adhd
#2
Valerie Van Cauwenberge, Rachida El Kaddouri, Karel Hoppenbrouwers, Jan R Wiersema
OBJECTIVE: We investigated cognitive reappraisal in children with ADHD by means of the late positive potential (LPP) and self-report ratings. We expected diminished LPP modulation following reappraisal and lower self-report scores in children with ADHD. METHODS: Eighteen children with ADHD and 24 typically developing (TD) children (8-12years) performed a cognitive reappraisal task, while EEG was recorded, and filled out a questionnaire on cognitive reappraisal. RESULTS: Despite the lack of main reappraisal effects on LPP, the LPP was less positively modulated during reappraisal in ADHD compared to TD children...
January 30, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28231478/event-related-brain-potential-indices-of-cognitive-function-and-brain-resource-reallocation-during-working-memory-in-patients-with-multiple-sclerosis
#3
Thomas J Covey, Janet L Shucard, David W Shucard
OBJECTIVE: To examine event-related brain potentials (ERPs) in Multiple Sclerosis (MS) during a visual n-back working memory (WM) task, and test the hypothesis that compensatory brain function may be associated with variance in task performance in MS patients. METHODS: Midline ERPs for 25MS patients and 18 HCs were obtained for a visual n-back task that placed increasing demands on WM. N-back behavioral measures and neuropsychological performance measures of WM were also obtained...
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28231477/effects-of-tdcs-on-motor-learning-and-memory-formation-a-consensus-and-critical-position-paper
#4
REVIEW
Ethan R Buch, Emiliano Santarnecchi, Andrea Antal, Jan Born, Pablo A Celnik, Joseph Classen, Christian Gerloff, Mark Hallett, Friedhelm C Hummel, Michael A Nitsche, Alvaro Pascual-Leone, Walter J Paulus, Janine Reis, Edwin M Robertson, John C Rothwell, Marco Sandrini, Heidi M Schambra, Eric M Wassermann, Ulf Ziemann, Leonardo G Cohen
Motor skills are required for activities of daily living. Transcranial direct current stimulation (tDCS) applied in association with motor skill learning has been investigated as a tool for enhancing training effects in health and disease. Here, we review the published literature investigating whether tDCS can facilitate the acquisition, retention or adaptation of motor skills. Work in multiple laboratories is underway to develop a mechanistic understanding of tDCS effects on different forms of learning and to optimize stimulation protocols...
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28231476/evaluation-of-cognitive-performance-in-professional-divers-by-means-of-event-related-potentials-and-neuropsychology
#5
Mehmet Ergen, Atilla Uslu, Ozlem Caglar, Sukriye Akca-Kalem, Maide Cimsit, Hakan Gurvit
OBJECTIVE: We investigated whether professional air diving with no decompression illness causes any long-term changes in cognitive functions. METHODS: The all-male participants consisted of 18 healthy control (HC) volunteers and 32 divers. Divers were divided into two subgroups as moderate exposure group, Divers-I (DI) and extensive exposure group, Divers-II (DII). Participants were administered a comprehensive neuropsychological battery and event-related potentials (ERPs) were recorded while they performed auditory oddball task and visual continuous performance test (CPT)...
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28228334/status-epilepticus-after-cardiac-arrest-some-strides
#6
EDITORIAL
G Bryan Young
No abstract text is available yet for this article.
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28226286/peripheral-nerve-ultrasonography-in-patients-with-transthyretin-amyloidosis
#7
Simon Podnar, Stayko Sarafov, Ivailo Tournev, Gregor Omejec, Janez Zidar
OBJECTIVE: To systematically study peripheral nerve morphology in patients with transthyretin (TTR) amyloidosis and TTR gene mutation carriers using high-resolution ultrasonography (US). METHODS: In this prospective cross-sectional study we took a structured history, performed neurological examination, and measured peripheral nerve cross-sectional areas (CSAs) bilaterally at 28 standard locations using US. Demographic and US findings were compared to controls. RESULTS: Peripheral nerve CSAs were significantly larger in 33 patients with familial amyloid polyneuropathy (FAP) compared to 50 controls, most dramatically at the common entrapment sites (median nerve at the wrist, ulnar nerve at the elbow), and in the proximal nerve segments (median nerve in the upper arm, sciatic nerve in the thigh)...
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28214108/cyclic-seizures-in-critically-ill-patients-clinical-correlates-dc-recordings-and-outcomes
#8
Lecio F Pinto, Emily J Gilmore, Ognen A Petroff, Adithya Sivaraju, Nishi Rampal, Lawrence J Hirsch, Nicolas Gaspard
OBJECTIVE: To describe EEG and clinical correlates, DC recordings and prognostic significance of cyclic seizures (CS). METHODS: We reviewed our prospective continuous EEG database to identify patients with CS, controls with non-cyclic status epilepticus (SE) and controls without seizure matched for age and etiology. EEG was reviewed with DC settings. RESULTS: 39/260 (15%) patients with electrographic seizures presented with CS. These patients were older (62 vs...
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28209256/sharpening-a-classic-scalpel-to-face-the-growth-of-alzheimer-s-dementia
#9
EDITORIAL
Tarek K Rajji
No abstract text is available yet for this article.
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28202220/diagnostic-yield-of-ambulatory-eegs-in-the-elderly
#10
Benjamin Tolchin, Jong Woo Lee, Milena Pavlova, Barbara A Dworetzky, Rani A Sarkis
OBJECTIVE: The diagnostic yield of ambulatory EEG in the elderly is not known. We sought to determine diagnostic yield and identify factors predicting diagnostic findings in this elderly population. METHODS: We reviewed 156 consecutive 24-72h ambulatory EEGs performed on patients aged 60 or older. RESULTS: Of the 156 studies, 58 studies (37%) revealed potentially diagnostic findings: either epileptiform discharges, an epileptic seizure, or a typical nonepileptic event...
January 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28231474/early-disturbances-in-multimodal-evoked-potentials-as-a-prognostic-factor-for-long-term-disability-in-relapsing-remitting-multiple-sclerosis-patients
#11
Frédéric London, Souraya El Sankari, Vincent van Pesch
OBJECTIVE: The aim of this study was to investigate whether early alterations in evoked potentials (EPs) have a prognostic value in relapsing-remitting multiple sclerosis (RRMS). METHODS: We retrospectively selected 108 early MS patients with a neurological follow-up ranging from 5 to 15years, in whom multimodal EPs (visual, brainstem auditory, somatosensory and motor) were performed at diagnosis. A conventional ordinal score was used to quantify the observed abnormalities...
January 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28231473/subthalamic-or-red-nucleus-a-puzzling-question-arising-during-intraoperative-recording-for-dbs
#12
LETTER
A Merola, G Mandybur, K Biddell, T K Tareen, H Wilson-Perez, A J Espay, A P Duker
No abstract text is available yet for this article.
January 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28214107/when-eeg-is-bad-for-you
#13
EDITORIAL
Selim R Benbadis, Pierre Thomas
No abstract text is available yet for this article.
January 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28222345/dc-eeg-recordings-of-mindfulness
#14
Ernst Rodin, Harald Bornfleth, Michael Johnson
OBJECTIVE: To assess the frequency spectrum of the normal waking human eyes-closed EEG while concentrating on a mental task. METHODS: Ten adult normal volunteers listened to a CD encouraging mindfulness for one hour and five minutes while their EEG was recorded on a 128 channel DC based ANT system. The software package BESA Research version 6.1 was used for data analysis. The data were subjected to topographic display, frequency as well as independent component analysis...
January 26, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28169132/electroencephalographic-characteristics-of-status-epilepticus-after-cardiac-arrest
#15
Sofia Backman, Erik Westhall, Irina Dragancea, Hans Friberg, Malin Rundgren, Susann Ullén, Tobias Cronberg
OBJECTIVE: To describe the electrophysiological characteristics and pathophysiological significance of electrographic status epilepticus (ESE) after cardiac arrest and specifically compare patients with unequivocal ESE to patients with rhythmic or periodic borderline patterns defined as possible ESE. METHODS: Retrospective cohort study of consecutive patients treated with targeted temperature management and monitored with simplified continuous EEG. Patients with ESE were identified and electrographically characterised until 72h after ESE start using the standardised terminology of the American Clinical Neurophysiology Society...
January 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28231475/the-use-and-yield-of-continuous-eeg-in-critically-ill-patients-a-comparative-study-of-three-centers
#16
Vincent Alvarez, Andres A Rodriguez Ruiz, Suzette LaRoche, Lawrence J Hirsch, Christopher Parres, Paula E Voinescu, Andres Fernandez, Ognen A Petroff, Nishi Rampal, Hiba Arif Haider, Jong Woo Lee
OBJECTIVE: Continuous EEG (cEEG) monitoring of critically ill patients has gained widespread use, but there is substantial reported variability in its use. We analyzed cEEG and antiseizure drug (ASD) usage at three high volume centers. METHODS: We utilized a multicenter cEEG database used daily as a clinical reporting tool in three tertiary care sites (Emory Hospital, Brigham and Women's Hospital and Yale - New Haven Hospital). We compared the cEEG usage patterns, seizure frequency, detection of rhythmic/periodic patterns (RPP), and ASD use between the sites...
January 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28226288/neural-correlates-of-lexical-decisions-in-parkinson-s-disease-revealed-with-multivariate-extraction-of-cortico-subthalamic-interactions
#17
F U Hohlefeld, A Ewald, F Ehlen, H O Tiedt, A Horn, A A Kühn, G Curio, F Klostermann, V V Nikulin
OBJECTIVE: Neural interactions between cortex and basal ganglia are pivotal for sensorimotor processing. Specifically, coherency between cortex and subthalamic structures is a frequently studied phenomenon in patients with Parkinson's disease. However, it is unknown whether cortico-subthalamic coherency might also relate to cognitive aspects of task performance, e.g., language processing. Furthermore, standard coherency studies are challenged by how to efficiently handle multi-channel recordings...
January 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28231479/intermittent-bilateral-coherence-in-physiological-and-essential-hand-tremor
#18
Soma Chakraborty, Jana Kopecká, Otakar Šprdlík, Martina Hoskovcová, Olga Ulmanová, Evžen Růžička, Martin Zapotocky
OBJECTIVE: To investigate the prevalence and the temporal structure of bilateral coherence in physiological (PT) and essential (ET) hand tremor. METHODS: Triaxial accelerometric recordings from both hands in 30 healthy subjects and 34 ET patients were analyzed using spectral coherence and wavelet coherence methods. In 12 additional healthy subjects, the relation between the hand tremor and the chest wall acceleration was evaluated using partial coherence analysis...
January 14, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28160753/lateralization-of-language-function-in-epilepsy-patients-a-high-density-scalp-derived-event-related-potentials-erp-study
#19
Karin Trimmel, Jens Sachsenweger, Gerald Lindinger, Eduard Auff, Fritz Zimprich, Ekaterina Pataraia
OBJECTIVES: Language functional magnetic resonance imaging (fMRI) represents the clinical standard for language lateralization assessment in presurgical epilepsy evaluation, but still many patients experience postoperative language deficits. Event-related potentials (ERPs), especially the negative component around and after 400ms, are related to language processing and could therefore represent a complementary method of language lateralization assessment. METHODS: Scalp EEG was recorded from 64 locations in 36 epilepsy patients and 37 controls during three visually presented language tasks: A short-term language memory task (differentiation memorized vs...
January 12, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28160748/resting-state-eeg-gamma-power-and-theta-gamma-coupling-enhancement-following-high-frequency-left-dorsolateral-prefrontal-rtms-in-patients-with-depression
#20
Yoshihiro Noda, Reza Zomorrodi, Takashi Saeki, Tarek K Rajji, Daniel M Blumberger, Zafiris J Daskalakis, Motoaki Nakamura
OBJECTIVE: We aimed to investigate neuromodulatory effects of high-frequency left dorsolateral prefrontal cortex repetitive transcranial magnetic stimulation (rTMS) on resting-state electroencephalography (EEG) and their clinical and cognitive correlates in patients with depression. METHODS: Thirty-one patients diagnosed with depression included in the present study. Resting-state gamma power and theta-gamma coupling (TGC) were calculated before and after a course of rTMS...
January 9, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
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