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

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https://www.readbyqxmd.com/read/28059855/american-clinical-meg-society-acmegs-position-statement-2-the-value-of-magnetoencephalography-meg-magnetic-source-imaging-msi-in-noninvasive-presurgical-mapping-of-eloquent-cortices-of-patients-preparing-for-surgical-interventions
#1
Anto I Bagić, Susan M Bowyer, Heidi E Kirsch, Michael E Funke, Richard C Burgess
No abstract text is available yet for this article.
January 5, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27930420/performance-of-spectrogram-based-seizure-identification-of-adult-eegs-by-critical-care-nurses-and-neurophysiologists
#2
Edilberto Amorim, Craig A Williamson, Lidia M V R Moura, Mouhsin M Shafi, Nicolas Gaspard, Eric S Rosenthal, Mary M Guanci, Venkatakrishna Rajajee, M Brandon Westover
INTRODUCTION: Continuous EEG screening using spectrograms or compressed spectral arrays (CSAs) by neurophysiologists has shorter review times with minimal loss of sensitivity for seizure detection when compared with visual analysis of raw EEG. Limited data is available on the performance characteristics of CSA-based seizure detection by neurocritical care nurses. METHODS: This is a prospective, cross-sectional study that was conducted in two academic neurocritical care units and involved thirty-three neurointensive care unit nurses and four neurophysiologists...
December 3, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27930419/repetitive-facial-nerve-stimulation-using-occipitalis-muscle
#3
Turgut Adatepe, Ayşegül Gündüz, Ahmet Yldrm, Nurten Uzun
INTRODUCTION: We aimed to evaluate the reliability and reproducibility of repetitive nerve stimulation (RNS) recorded on occipitalis muscle by comparing recordings on nasalis muscle in healthy subjects. SUBJECTS: and methods: A total of 23 healthy subjects (mean age: 44.7±13.8 years) underwent detailed neurological examination and RNS using nasalis and occipitalis muscles. Amplitude and area percentage changes of CMAPs after RNS with different frequency were compared between right and left-sides and between recordings on nasalis and occipitalis muscles...
December 3, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27893495/integration-of-eeg-into-psychiatric-practice-a-step-toward-precision-medicine-for-autism-spectrum-disorder
#4
Ronald J Swatzyna, Jay D Tarnow, Robert P Turner, Alexandra J Roark, Erin K MacInerney, Gerald P Kozlowski
INTRODUCTION: Data from an EEG is not commonly used by psychiatrists to plan treatment and medication. However, EEG abnormalities such as isolated epileptiform discharges (IEDs) are found to be more prevalent in psychiatric patients, particularly those diagnosed with Autism Spectrum Disorder (ASD). Most medications prescribed for ASD lower seizure threshold and increase side-effects. Therefore, it may be prudent to order an EEG for ASD cases, especially those categorized as refractory...
November 22, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27893494/a-comparison-of-magnetic-resonance-imaging-and-electroneuromyography-for-denervated-muscle-diagnosis
#5
Betül Tepeli, Metin Karataş, Mehmet Coşkun, Oya Ümit Yemişçi
INTRODUCTION: The aim of this study was to evaluate the diagnostic value of magnetic resonance imaging (MRI) for muscle denervation due to focal lesions of the median nerve and to compare electrophysiological findings with MRI findings. METHODS: Twenty-six patients with electrophysiological studies diagnose for focal lesions of the median nerve were included in this study. Electrophysiological studies and MRI were conducted on 34 patients' hands. Patient hands were divided into two groups based on edema findings revealed by the MRI: group 1 (edema-negative group; n = 24) and group 2 (edema-positive group; n = 10)...
November 21, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27861192/generation-of-repeater-f-waves-in-healthy-subjects
#6
Elisabeth Chroni, Dimitra Veltsista, Chris Papapaulou, Eftychia Trachani
INTRODUCTION: F waves identical in latency, size and shape, known as repeater F waves, have been observed occasionally in normal motor conduction recordings. The purpose of this study was to examine the occurrence and characteristics of repeater F waves in healthy subjects under different testing conditions, aiming to selectively excite lower and higher threshold motor fibers. METHODS: Sessions of 40 traces were recorded from the ulnar nerve in 12 volunteers, applying/ using supramaximal, submaximal stimuli (intensity able to elicit 30% and 60% of the maximum compound muscle action potential amplitude) and a collision technique...
November 17, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27870647/meg-may-reveal-hidden-population-of-spikes-in-epilepsy-with-porencephalic-cyst-encephalomalacia
#7
Yosuke Kakisaka, Zhong I Wang, Sumiya Shibata, Yoko Takahashi, John C Mosher, Andreas V Alexopoulos, Richard C Burgess
Porencephalic cyst/encephalomalacia (PC/E) is often associated with intractable epilepsy. A Limited number of studies reported Magnetoencephalography (MEG)'s potential to help construct treatment strategy for epilepsies associated with PC/E. We present here simultaneous EEG and MEG findings in three adult patients with pediatric-onset epilepsy due to PC/E. There were two types of spikes: one type was detected by MEG only (EEG-/MEG+), and the other detected by both EEG and MEG (EEG+/MEG+). Both types were seen in all three cases...
November 16, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27870646/ultrasound-guided-electrodes-for-conduction-studies-of-the-saphenous-nerve
#8
M E Evangelopoulos, S Humpert, K M Rösler
INTRODUCTION: Saphenous nerve conduction studies are difficult, since the nerve is hard to localize and evoked responses are small. Ultrasound imaging may assist in the accurate localization and optimal positioning of surface (SE) and needle electrodes (NE). METHODS: The study population included 39 subjects and was divided into 2 groups. Group A consisted of 20 healthy subjects, while group B of 19 patients with polyneuropathies. Orthodromic conduction was measured by distal supramaximal nerve stimulation...
November 16, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27832046/periodic-discharges-insight-from-magnetoencephalography
#9
V Shvarts, G Zoltay, S M Bowyer, A Zillgitt, J E Moran, K Mason R, N Tepley, D Burdette
PURPOSE: This study utilized magnetoencephalography (MEG) dipole localization and coherence measurement to evaluate the magnetic fields associated with periodic discharges. The primary goal of the study was to evaluate whether MEG could consistently localize quasiperiodic discharges that were observed on the EEG portion of the recording. The secondary objective was to evaluate whether coherence measurements would correlate with topographic maxima of epileptiform activity. METHODS: A total of 13 inpatients, whose electrographic records demonstrated lateralized periodic discharges (LPDs), were recruited from Henry Ford Hospital neurology and intensive care units...
November 9, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045858/diagnosis-of-electrical-status-epilepticus-during-slow-wave-sleep-with-100-seconds-of-sleep
#10
Amanda B Weber, Dara V Albert, Han Yin, Timothy P Held, Anup D Patel
PURPOSE: Strategies for diagnosing electrical status epilepticus during slow-wave sleep (ESES) vary among interpreting neurologists. Our aim was to evaluate if the spike-wave index (SWI) for the first 100 seconds of sleep is reflective of the SWI when compared with a conventional method. METHODS: We reviewed EEGs from 2005 to 2011 that were considered diagnostic of ESES based on unspecified methods. The SWI for the first nonrapid eye movement sleep cycle (long method) was calculated by two neurophysiologists...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045857/quantitative-eeg-after-brain-stimulation-and-cognitive-training-in-alzheimer-disease
#11
Revital Gandelman-Marton, Sergio Aichenbaum, Evgenya Dobronevsky, Michael Khaigrekht, Jose M Rabey
PURPOSE: Medications are the currently accepted symptomatic treatment of Alzheimer disease (AD), but their impact on delaying the progression of cognitive deficits and functional impairment is limited. The authors aimed to explore long-term electrophysiological effects of repetitive transcranial magnetic stimulation interlaced with cognitive training on quantitative electroencephalography (EEG) in patients with AD. METHODS: Quantitative EEG was assessed on non-repetitive transcranial magnetic stimulation interlaced with cognitive training treatment days before treatment and after each treatment phase in seven patients with mild AD...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045856/a-multiparametric-alarm-criterion-for-motor-evoked-potential-monitoring-during-spine-deformity-surgery
#12
Martín J Segura, María E Talarico, Mariano A Noel
PURPOSE: This is a pilot study to compare changes in the amplitude, area below the curve, number of phases, duration, and latency of the intraoperative transcranial motor evoked potentials (TcMEP) for early detection of impending spinal cord injury. An empirical ratio calculated by a combination of the above-mentioned parameters was also assessed. METHODS: Intraoperative TcMEP recordings from five patients presenting with neuromuscular kyphoscoliosis, idiopathic scoliosis, achondroplasia and lumbar kyphosis, congenital kyphosis, and achondroplasia with cervical instability were reviewed...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045855/the-interpretation-of-muscle-motor-evoked-potentials-for-spinal-cord-monitoring
#13
Karl F Kothbauer
OBJECTIVE: To provide a summary of the intraoperative monitoring of muscle motor evoked potentials (MEPs) based on the presence-absence concept during neurosurgical operations along the spinal cord. METHOD: Expert review. DISCUSSION: The measurable parameters of MEPs, such as signal amplitudes and thresholds vary considerably both during a single surgery in a single individual patient as well as between individuals and operations. The presence or absence of responses irrespective of stimulus intensity and response amplitude is much more clearly defined...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045854/the-percentage-of-amplitude-decrease-warning-criteria-for-transcranial-mep-monitoring
#14
Henricus L Journée, Hanneke I Berends, Moyo C Kruyt
Muscle motor evoked potentials (MEPs) from transcranial electrical stimulation (TES) became a standard technique for monitoring the motor functions of the brain and spinal cord at risk during spinal and brain surgery. However, a wide range of criteria based on the percentage of amplitude decrease is used in practice. A survey of the current literature on clinical outcome parameters reveals a variety of percentages in a range of 30% to 100% (50% to 100% spinal procedures) with no consensus. The interpretation of muscle MEPs is hampered by their sensitivity to many interfering factors...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045853/intraoperative-neuromonitoring-and-alarm-criteria-for-judging-mep-responses-to-transcranial-electric-stimulation-the-threshold-level-method
#15
Blair Calancie
The motor evoked potential (MEP) is used in the operating room to gauge-and ultimately protect-the functional integrity of the corticospinal tract (CST). However, there is no consensus as to how to best interpret the MEP for maximizing its sensitivity and specificity to CST compromise. The most common way is to use criteria associated with response magnitude (response amplitude; waveform complexity, etc.). With this approach, should an MEP in response to a fixed stimulus intensity diminish below some predetermined cutoff, suggesting CST dysfunction, then the surgical team is warned...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045852/overview-on-criteria-for-mep-monitoring
#16
David B MacDonald
Intraoperative motor evoked potentials include the D-wave as a surrogate for long-term motor outcome and muscle motor evoked potentials as a surrogate for early outcome. Their efficacy depends on excluding confounding factors and on warning criteria; insufficiently sensitive criteria could result in unpredicted deficits, whereas excessively sensitive ones could cause false alarms deterring surgical treatment and jading surgeons to alerts, eventually leading to deficits through failure to intervene. Although D-waves have few indications, they are nonsynaptic, linear, and stable-properties that support amplitude reduction criteria: >50% for intramedullary spinal cord tumor surgery and >30% to 40% for peri-Rolandic brain surgery...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28045851/motor-evoked-potential-warning-criteria
#17
David B MacDonald
No abstract text is available yet for this article.
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27763968/effects-of-marijuana-on-ictal-and-interictal-eeg-activities-in-idiopathic-generalized-epilepsy
#18
Sanjeev Sivakumar, Deepti Zutshi, Navid Seraji-Bozorgzad, Aashit K Shah
Marijuana-based treatment for refractory epilepsy shows promise in surveys, case series, and clinical trials. However, literature on their EEG effects is sparse. Our objective is to analyze the effect of marijuana on EEG in a 24-year-old patient with idiopathic generalized epilepsy treated with cannabis. We blindly reviewed 3 long-term EEGs-a 24-hour study while only on antiepileptic drugs, a 72-hour EEG with Cannabis indica smoked on days 1 and 3 in addition to antiepileptic drugs, and a 48-hour EEG with combination C indica/sativa smoked on day 1 plus antiepileptic drugs...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27763967/functional-mri-correlates-of-resting-state-temporal-theta-and-delta-eeg-rhythms
#19
Rohit A Marawar, Hsiang J Yeh, Christopher J Carnabatu, John M Stern
PURPOSE: The EEG rhythms demonstrate changes in frequency and power with spontaneous changes in behavioral state that do not have well-understood metabolic correlates within the brain. To investigate this question and compare the temporal lobe theta and delta rhythms, resting-state functional MRI was obtained with simultaneous EEG. METHODS: Simultaneous EEG-functional MRI was recorded from 14 healthy sleep-deprived subjects in awake and drowsy states. Scalp electrodes corresponding to bilateral temporal lobes were used to calculate delta and theta band power...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27748723/seizures-and-epileptiform-discharges-in-patients-with-acute-subdural-hematoma
#20
Sebastian Pollandt, Bichun Ouyang, Thomas P Bleck, Katharina M Busl
PURPOSE: Subdural hematomas (SDH) are associated with seizures and epileptiform discharges, but little is known about the prevalence and impact of seizures, status epilepticus (SE), and epileptiform discharges on outcomes in patients with isolated acute SDH (aSDH). METHODS: Continuous EEG reports from 76 adult patients admitted to Rush University Medical Center with aSDH between January 2009 and March 2012 were reviewed. Clinical and radiographic findings, comorbidities, treatment, and outcome parameters, such as mortality, discharge destination, need for tracheostomy/percutaneous endoscopic gastrostomy placement, and length of stay (LOS), were assessed...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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