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Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society

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https://www.readbyqxmd.com/read/30418267/quantitative-eeg-after-subarachnoid-hemorrhage-predicts-long-term-functional-outcome
#1
Stephanie Gollwitzer, Tamara M Müller, Rüdiger Hopfengärtner, Stephan Rampp, Jasmin Merkel, Mareike Hagge, Jelena Jukic, Johannes Lang, Dominik Madžar, Müjgan Dogan Onugoren, Hagen B Huttner, Stefan Schwab, Hajo M Hamer
PURPOSE: Delayed cerebral ischemia is a major complication after subarachnoid hemorrhage. Our previous study showed that alpha power reduction in continuous quantitative EEG predicts delayed cerebral ischemia. In this prospective cohort, we aimed to determine the prognostic value of alpha power in quantitative EEG for the long-term outcome of patients with subarachnoid hemorrhage. METHODS: Adult patients with nontraumatic subarachnoid hemorrhage were included if admitted early enough for EEG to start within 72 hours after symptom onset...
November 8, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30418266/analysis-of-movement-related-beta-oscillations-in-the-off-medication-state-during-subthalamic-nucleus-deep-brain-stimulation-surgery
#2
Ryan B Kochanski, Jay Shils, Leo Verhagen Metman, Gian Pal, Sepehr Sani
PURPOSE: Local field potential recordings from deep brain stimulation (DBS) leads provide insight into the pathophysiology of Parkinson disease (PD). We recorded local field potential activity from DBS leads within the subthalamic nucleus in patients with PD undergoing DBS surgery to identify reproducible pathophysiological signatures of the disease. METHODS: Local field potentials were recorded in 11 hemispheres from patients with PD undergoing subthalamic nucleus-DBS...
November 8, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30247381/neurophysiological-evidence-of-motor-network-reorganization-in-myotonic-dystrophy-type-1-a-pilot-magnetoencephalographic-study
#3
Emanuela Formaggio, Alessandra Del Felice, Cristina Turco, Paola Cudia, Alfonc Baba, Francesca Bevilacqua, Stefano Masiero, Francesco Piccione
PURPOSE: Myotonic dystrophy type 1 is the most common muscular dystrophy in adults. Although brain involvement is well recognized, the relationship between cortical motor control and voluntary movement has not been sufficiently explored. This study aims at assessing magnetoencephalographic (MEG) rhythms at oscillatory and connectivity levels to map central motor control. METHODS: Magnetoencephalographic data were acquired from healthy subjects and five myotonic dystrophy type 1 subjects during resting state and foot movement...
November 5, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30394946/electroclinical-features-of-generalized-paroxysmal-fast-activity-in-typical-absence-seizures
#4
Lalit Bansal, Lines Vargas Collado, Kailash Pawar, Deepti Nagesh, Mohammed Ilyas, Ara Hall, Brad Kinnaman, Ahmed Abdelmoity
PURPOSE: Generalized paroxysmal fast activity (GPFA) is a diffuse, paroxysmal, frontal predominant activity described in patients with generalized epilepsies. Studies specifically focusing on electroclinical features of typical absence seizures in children have not reported any GPFA-like features. We sought to identify GPFA in children with typical absence seizures, study its incidence, characteristic electroclinical features, and effect on their epilepsy. METHODS: We performed a retrospective review of electroencephalograms of children with diagnosis of absence epilepsy...
November 1, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30383719/interrater-and-intrarater-agreement-in-neonatal-electroencephalogram-background-scoring
#5
Shavonne L Massey, Haochang Shou, Robert Clancy, Marissa DiGiovine, Mark P Fitzgerald, France W Fung, John Farrar, Nicholas S Abend
PURPOSE: Many neonates undergo electroencephalogram (EEG) monitoring to identify and manage acute symptomatic seizures. Information about brain function contained in the EEG background data may also help predict neurobehavioral outcomes. For EEG background features to be useful as prognostic indicators, the interpretation of these features must be standardized across electroencephalographers. We aimed at determining the interrater and intrarater agreement among electroencephalographers interpreting neonatal EEG background patterns...
October 31, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30383718/improved-patient-independent-system-for-detection-of-electrical-onset-of-seizures
#6
Veerasingam Sridevi, Machireddy Ramasubba Reddy, Kannan Srinivasan, Kurupath Radhakrishnan, Chaturbhuj Rathore, Dinesh S Nayak
PURPOSE: To design a non-patient-specific system to detect the electrical onset of seizures in patients with temporal lobe epilepsy. METHODS: We used EEG data from 29 seizures of 18 temporal lobe epilepsy patients who underwent multiday video-scalp EEG monitoring as part of their presurgical evaluations. We segmented each data set into preictal and ictal phases, and identified spectral entropy, spectral energy, and signal energy as useful features for discriminating normal and seizure conditions...
October 31, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30335664/intranetwork-and-internetwork-effects-of-navigated-transcranial-magnetic-stimulation-using-low-and-high-frequency-pulse-application-to-the-dorsolateral-prefrontal-cortex-a-combined-rtms-fmri-approach
#7
Haosu Zhang, Nico Sollmann, Gabriel Castrillón, Katarzyna Kurcyus, Bernhard Meyer, Claus Zimmer, Sandro M Krieg
PURPOSE: Although transcranial magnetic stimulation (TMS) is routinely applied in neuroscience and clinical settings, not much is known about its effects on brain networks. Therefore, this pilot study was set up using repetitive navigated transcranial magnetic stimulation (rTMS) combined with resting-state functional MRI (rs-fMRI) to explore frequency-dependent stimulation effects on an intranetwork and internetwork level. METHODS: Six healthy subjects (median age: 23...
October 17, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30334832/application-of-navigated-transcranial-magnetic-stimulation-to-map-the-supplementary-motor-area-in-healthy-subjects
#8
Severin Schramm, Nico Sollmann, Sebastian Ille, Bernhard Meyer, Sandro M Krieg
PURPOSE: The supplementary motor area is involved in the planning and coordination of movement sequences. This study investigates the potential of repetitive navigated transcranial magnetic stimulation for systematic mapping of the supplementary motor area by interfering with normal movement coordination processing. METHODS: Ten healthy females (median age: 23.5 years) performed the Jebsen-Taylor Hand Function Test, first without stimulation (baseline) and afterward during application of repetitive navigated transcranial magnetic stimulation with 10 Hz to 6 cortical sites located within the supplementary motor area of both hemispheres...
October 16, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30308550/electrophysiological-assessment-and-classification-of-motor-pathway-function-in-patients-with-spinal-dural-arteriovenous-fistula
#9
Kazuyoshi Nakanishi, Nobuhiro Tanaka, Yoshinori Fujimoto, Koichiro Nishikawa, Naosuke Kamei, Toshio Nakamae, Shinji Kotaka, Nobuo Adachi
PURPOSE: The diagnosis of spinal dural arteriovenous fistula (SDAVF) is difficult and often delayed because clinical features are often nonspecific. We assessed the motor function electrophysiologically in patients with SDAVF. METHODS: Motor-evoked potentials after transcranial magnetic stimulation and compound muscle action potentials and F-waves after electrical stimulation in the ulnar and tibial nerves were measured from the abductor hallucis (AH) muscles in 14 patients with SDAVF (SDAVF group), 12 patients with compressive thoracic myelopathy (CTM group), and 16 normal subjects (control group)...
October 9, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30289769/assessing-the-feasibility-of-providing-a-real-time-response-to-seizures-detected-with-continuous-long-term-neonatal-electroencephalography-monitoring
#10
Cynthia Sharpe, Suzanne L Davis, Gail E Reiner, Lilly I Lee, Jeff J Gold, Mark Nespeca, Sonya G Wang, Priscilla Joe, Rachel Kuperman, Marissa Gardner, Jose Honold, Brian Lane, Ellen Knodel, Deborah Rowe, Malcolm R Battin, Renee Bridge, Jim Goodmar, Ben Castro, Maynard Rasmussen, Kathy Arnell, MaryJane Harbert, Richard Haas
PURPOSE: Continuous video electroencephalography (cEEG) monitoring is the recommended gold standard of care for at-risk neonates but is not available in many Neonatal Intensive Care Units (NICUs). To conduct a randomized treatment trial of levetiracetam for the first-line treatment of neonatal seizures (the NEOLEV2 trial), we developed a monitoring infrastructure at five NICUs, implementing recent technological advancements to provide continuous video EEG monitoring and real-time response to seizure detection...
October 4, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30260816/nerve-ultrasound-electrophysiological-and-clinical-changes-in-treatment-naive-chronic-inflammatory-demyelinating-polyneuropathy-a-case-report
#11
Takeo Sato, Yuka Terasawa, Hitomi Higa, Hiromasa Matsuno, Ayumi Arai, Shusaku Omoto, Hidetaka Mitsumura, Chizuko Toyoda, Haruki Koike, Yasuyuki Iguchi
We report the case of a 74-year-old woman with treatment-naive chronic inflammatory demyelinating polyneuropathy evaluated by both nerve conduction studies and nerve ultrasound (NUS) before and after initial treatment. Performing both nerve conduction study and NUS before and after initial treatment seems rare for treatment-naive chronic inflammatory demyelinating polyneuropathy. This case yielded two major findings. First, improvement of nerve swelling as evaluated by NUS correlated well with the improvement of neurological symptoms...
September 25, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30247385/intraoperative-neuromonitoring-of-motor-evoked-potentials-in-infants-undergoing-surgery-of-the-spine-and-spinal-cord
#12
Elif Ilgaz Aydinlar, Pinar Yalinay Dikmen, Muge Kocak, Nigar Baykan, Nogayhan Seymen, Memet Metin Ozek
PURPOSE: The aim of this single-center prospective cohort study is to record reliable transcranial motor-evoked potentials (TcMEPs) and to determine their thresholds under inhalational anesthesia in infants undergoing spine and spinal cord surgery. METHODS: A total of 15 infants (age <12 months) with mean (SD) months: 5.82 ± 3.45 were included. The entry criteria were that the child should be no older than 1 year of age and undergoing a surgical procedure at the conus-cauda region...
September 21, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30247180/a-waves-in-diabetic-neuropathy-pathophysiology-and-neurographic-images
#13
Liborio Rampello, Luigi Rampello, Antonio Arcidiacono
INTRODUCTION: To evaluate the presence of A waves in diabetic neuropathy, we designed a retrospective observational study recruiting patients with type II diabetes and chronic diabetic distal sensorimotor polyneuropathy. METHODS: We recruited 238 patients of both sexes aged between 41 and 89 years. Neurography was undertaken on two bilateral upper (median and ulnar) and lower (peroneal and tibial) limb nerves. As controls, we considered that neurographs performed bilaterally on the same nerves of 40 healthy subjects...
September 21, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30387785/relationship-between-eeg-electrode-and-functional-cortex-in-the-international-10-to-20-system
#14
Victoria L Ives-Deliperi, James Thomas Butler
INTRODUCTION: In this study, we attempted to define the variability in the anatomical relationship between scalp EEG electrodes and eloquent cortical function, as inferred from fMRI. METHODS: MRI-compatible fiducial markers were positioned at locations of CZ, C3 and C4, T3 and T4, and F7 and F8 in 10 healthy subjects. Well-validated fMRI paradigms were administered to activate primary motor cortex and language regions, and the distance between these brain regions and fiducial markers was measured...
November 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30387784/short-infraslow-activity-sisa-with-burst-suppression-in-acute-anoxic-encephalopathy-a-rare-specific-ominous-sign-with-acute-posthypoxic-myoclonus-or-acute-symptomatic-seizures
#15
Masaya Togo, Takefumi Hitomi, Tomohiko Murai, Hajime Yoshimura, Masao Matsuhashi, Riki Matsumoto, Michi Kawamoto, Nobuo Kohara, Ryosuke Takahashi, Akio Ikeda
OBJECTIVE: Slow wave with frequency <0.5 Hz are recorded in various situations such as normal sleep, epileptic seizures. However, its clinical significance has not been fully clarified. Although infra-slow activity was recently defined as activity between 0.01 and 0.1 Hz, we focus on the activity recorded with time constant of 2 seconds for practical usage. We defined short "infraslow" activity (SISA) less than 0.5 Hz recorded with time constant of 2 seconds and investigated the occurrence and clinical significance of SISA in acute anoxic encephalopathy...
November 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30387783/need-for-thorough-standardization-of-co2-laser-evoked-potential-procedure
#16
Katarina I Tudor, Damir Petravić, Magdalena Krbot Skorić, Velimir Išgum
PURPOSE: The objective of this study was to determine normative values of laser evoked potentials and anthropometric correlations in a healthy middle-aged working population. METHODS: In 51 subjects, CO2 laser stimulation was applied bilaterally onto dorsal surface of the feet, hands, and neck using constant duration of stimulus and beam diameter, changing just the intensity of stimulation. Amplitudes and latencies of the laser evoked potential negative-positive complex were recorded, and relationship with height, age and gender was statistically analyzed...
November 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30387782/prognosis-of-bell-palsy-a-clinical-neurophysiological-and-ultrasound-study
#17
Maha A Zaki, Saly H Elkholy, Noha T Abokrysha, Alshaimaa Sobhi Khalil, Amani M Nawito, Nagween W Magharef, Nirmeen A Kishk
PURPOSE: Bell palsy is the most common cause of acute facial nerve paralysis. Ultrasound has proved its ability in detecting structural lesions along the course of the affected nerves.The current work aimed at studying the accuracy of ultrasound to predict the prognosis of Bell palsy in correlation to the clinical scale and nerve conduction studies. METHODS: The study included 20 cases of acute Bell palsy treated with prednisolone and physiotherapy. The participants were examined using the House-Brackmann (HB) scale, electrophysiologically and neurosonologically in the affected side and healthy side that served as a control...
November 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30320663/novel-mapping-method-for-the-intraoperative-neurophysiologic-monitoring-of-sexual-function-during-prostate-surgery
#18
Guillermo Martín-Palomeque, Lidia Cabañes-Martínez, Gema de Blas Beorlegui, M Del Mar Moreno Galera, Jaime R López, Francisco Javier Burgos, Ignacio Regidor Bailly-Baillière
PURPOSE: The occurrence of urinary incontinence and erectile dysfunction after surgical treatment for prostate cancer is a significant and lingering problem. The aim of this study is to revise and improve older techniques of intraoperative cavernous nerve mapping already in use to improve accuracy and reliability. METHODS: We prospectively studied this technique in 12 patients suffering from prostate cancer. Inhalation or intravenous anesthetic regimen was used with nondepolarizing muscle relaxants...
November 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30247384/predictive-value-of-midline-spikes-on-pediatric-eeg-for-seizure-and-developmental-outcome
#19
Anita N Datta, Laura Wallbank, Qi Xu, Peter K H Wong
PURPOSE: Midline spikes are epileptiform discharges localized to the midsagittal regions of the brain. Isolated midline spikes are rare, but more common in children. Our objective was to determine whether midline spikes are predictive of seizure characteristics and neurodevelopment. METHODS: EEGs and clinical information of 123 children with isolated midline spikes, and EEG follow-up within 12 to 24 months, were reviewed and compared with controls. RESULTS: Most children with midline spikes had seizures (91%), with an equal predisposition to focal or generalized seizure semiology...
November 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30247383/needle-emg-of-thenar-muscles-in-less-severe-carpal-tunnel-syndrome
#20
Devon I Rubin, Elliot L Dimberg
INTRODUCTION: The value of needle electromyography (EMG) in thenar muscles in patients with less severe carpal tunnel syndrome is controversial. METHODS: Patients referred for electrodiagnostic testing for carpal tunnel syndrome, in which nerve conduction study demonstrated median sensory nerve conduction study abnormalities and either normal median motor nerve conduction study or only prolonged median motor distal latencies (DLs) (with normal amplitudes) were prospectively studied...
November 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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