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

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https://www.readbyqxmd.com/read/28166083/electrographic-features-of-lateralized-periodic-discharges-stratify-risk-in-the-interictal-ictal-continuum
#1
Christopher R Newey, Pradeep Sahota, Stephen Hantus
PURPOSE: To risk-stratify electrographic features of lateralized periodic discharges (LPDs) in acute structural brain lesions for predictors of electrographic seizures. METHODS: This is a retrospective review of 100 consecutive patients with LPDs. Epileptiform features of LPDs were described based on electrographic features: blunt delta morphology, sharply contoured, overlying fast frequencies, and/or rhythmicity (loss of interdischarge interval lasting ≥1 second)...
January 30, 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
PURPOSE: 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 are 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 33 neurointensive care unit nurses and four neurophysiologists...
January 25, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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
#3
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/27930419/repetitive-facial-nerve-stimulation-using-occipitalis-muscle
#4
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/28045858/diagnosis-of-electrical-status-epilepticus-during-slow-wave-sleep-with-100-seconds-of-sleep
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
https://www.readbyqxmd.com/read/27490325/hyperventilation-in-patients-with-focal-epilepsy-electromagnetic-tomography-functional-connectivity-and-graph-theory-a-possible-tool-in-epilepsy-diagnosis
#16
Edoardo Mazzucchi, Catello Vollono, Anna Losurdo, Elisa Testani, Valentina Gnoni, Chiara Di Blasi, Nadia M Giannantoni, Leonardo Lapenta, Valerio Brunetti, Giacomo Della Marca
PURPOSE: Hyperventilation (HV) is a commonly used electroencephalogram activation method. METHODS: We analyzed EEG recordings in 22 normal subjects and 22 patients with focal epilepsy of unknown cause. We selected segments before (PRE), during (HYPER), and 5 minutes after (POST) HV. To analyze the neural generators of EEG signal, we used standard low-resolution electromagnetic tomography (sLORETA software). We then computed EEG lagged coherence, an index of functional connectivity, between 19 regions of interest...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27490324/large-amplitude-cortical-evoked-potentials-in-nonepileptic-patients-reviving-an-old-neurophysiologic-tool-to-help-detect-cns-pathology
#17
Guillermo Martín-Palomeque, Antonio Castro-Ortiz, Pilar Pamplona-Valenzuela, Miguel Á Saiz-Sepúlveda, Lidia Cabañes-Martínez, Jaime R López
PURPOSE: Although large amplitude evoked potentials (EPs) are typically associated with progressive myoclonic epilepsy patients, giant EPs imply central nervous system (CNS) hyperexcitability and can be seen in various nonepileptic disorders. METHODS: We performed a retrospective chart review including history, physical examination, imaging and diagnostic studies of nonepileptic patients with large amplitude somatosensory evoked potentials (SSEPs) and visual evoked potentials (VEPs) during 2007 to 2013...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27490323/maximizing-the-yield-of-rapid-eye-movement-sleep-in-the-epilepsy-monitoring-unit
#18
Marcus C Ng
PURPOSE: Rapid eye movement (REM) sleep can help localize the epileptogenic zone in multifocal epilepsy when interictal discharges appear diffuse. However, REM sleep is reputedly rare and easily overlooked in the Epilepsy Monitoring Unit (EMU). The aims of this study are to determine the characteristics of REM sleep in a typical EMU and whether using automated artifact recognition can meaningfully enhance REM sleep detection. METHODS: Artifact-based REM sleep detection was applied to 581 nights of EMU recording from 100 patients over 12 months...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27490322/phase-synchronization-analysis-of-natural-wake-and-sleep-states-in-healthy-individuals-using-a-novel-ensemble-phase-synchronization-measure
#19
Chetan S Nayak, Aakash Bhowmik, Pradeep D Prasad, Sandipan Pati, Kalyan K Choudhury, Kaushik K Majumdar
PURPOSE: Electrical activity in the brain is presumed to arise from a combination of tonic asynchronous neuronal firing during wake and a synchronized, burst-pause firing of large number of neurons during sleep. This study aims to compare the phase synchronization index (SI) across multiple channels during wake and various sleep stages on scalp electroencephalographic recordings. METHODS: Forty healthy subjects were subjected to overnight polysomnography using 8-channel electroencephalography...
January 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27922904/utilization-of-quantitative-eeg-trends-for-critical-care-continuous-eeg-monitoring-a-survey-of-neurophysiologists
#20
Christa B Swisher, Saurabh R Sinha
PURPOSE: Quantitative EEG (QEEG) can be used to assist with review of large amounts of data generated by critical care continuous EEG monitoring. This study aimed to identify current practices regarding the use of QEEG in critical care continuous EEG monitoring of critical care patients. METHODS: An online survey was sent to 796 members of the American Clinical Neurophysiology Society (ACNS), instructing only neurophysiologists to participate. RESULTS: The survey was completed by 75 neurophysiologists that use QEEG in their practice...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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