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

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https://www.readbyqxmd.com/read/30234690/relative-yield-of-meg-and-eeg-spikes-in-simultaneous-recordings
#1
John S Ebersole, Michael Wagner
PURPOSE: Most clinical magnetoencephalography (MEG) centers record both MEG and EEG, but model only MEG sources. This may be related to the belief that MEG spikes are more prevalent, MEG is more sensitive, or to proprietary software limitations. Biophysics would contend, however, that EEG, being sensitive to radial and tangential source orientations, would provide complementary data for analysis. METHODS: We recorded 306 channels of MEG and 25 channels of EEG simultaneously in 297 consecutive patients over 3 years...
September 17, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30216207/eeg-reactivity-evaluation-practices-for-adult-and-pediatric-hypoxic-ischemic-coma-prognostication-in-north-america
#2
Edilberto Amorim, Emily J Gilmore, Nicholas S Abend, Cecil D Hahn, Nicolas Gaspard, Susan T Herman, Lawrence J Hirsch, Jong Woo Lee, Sydney S Cash, M Brandon Westover
PURPOSE: The aim of this study was to assess the variability in EEG reactivity evaluation practices during cardiac arrest prognostication. METHODS: A survey of institutional representatives from North American academic hospitals participating in the Critical Care EEG Monitoring Research Consortium was conducted to assess practice patterns involving EEG reactivity evaluation. This 10-question multiple-choice survey evaluated metrics related to technical, interpretation, personnel, and procedural aspects of bedside EEG reactivity testing and interpretation specific to cardiac arrest prognostication...
September 13, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30222638/triphasic-waves-and-encephalopathy-in-the-setting-of-pregabalin-toxicity
#3
Pria Anand, Peter Wolfe Kaplan
EEG triphasic waves are usually seen in the setting of metabolic encephalopathies, but may also occur secondary to medication toxicity. There are few reports of medications causing continuous triphasic waves, and only rare reports in the literature show an association between these discharges and pregabalin toxicity. Here, we describe triphasic waves in a patient with underlying white matter lesions, as well as pregabalin toxicity, secondary to renal insufficiency. Patients with renal or hepatic failure presenting with triphasic waves and confusion pose a diagnostic challenge in determining whether the etiology of their encephalopathy is purely metabolic or whether it results from impaired medication clearance and subsequent toxicity...
September 11, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30216206/author-s-reply-to-letter-to-the-editor
#4
Brandy B Ma, Emily L Johnson, Eva K Ritzl
No abstract text is available yet for this article.
September 11, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30216205/reduced-electrode-arrays-for-icu-continuous-eeg-seizure-detection-minding-the-methods-and-keeping-perspective
#5
Kenneth G Jordan
No abstract text is available yet for this article.
September 11, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30004913/magnetoencephalographic-recordings-in-infants-a-retrospective-analysis-of-seizure-focus-yield-and-postsurgical-outcomes
#6
Stephanie Garcia-Tarodo, Michael Funke, Lisa Caballero, Liang Zhu, Manish N Shah, Gretchen K Von Allmen
PURPOSE: Magnetoencephalography (MEG) is often incorporated into the presurgical work-up of children with pharmacoresistant epilepsy. There is growing literature on its role in improving selection for epilepsy surgery, particularly when brain MRI is "non-lesional" or in patients with recurrence or intractable seizures after epilepsy surgery. There are, however, no reports on the extrapolation of its role in the presurgical decision-making process of infants. METHODS: We performed a retrospective analysis of infants who underwent MEG over a 10-year period at our center for presurgical work-up...
July 12, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30028830/interictal-epileptiform-discharge-detection-in-eeg-in-different-practice-settings
#7
Jonathan J Halford, M Brandon Westover, Suzette M LaRoche, Micheal P Macken, Ekrem Kutluay, Jonathan C Edwards, Leonardo Bonilha, Giridhar P Kalamangalam, Kan Ding, Jennifer L Hopp, Amir Arain, Rachael A Dawson, Gabriel U Martz, Bethany J Wolf, Chad G Waters, Brian C Dean
OBJECTIVE: The goal of the study was to measure the performance of academic and private practice (PP) neurologists in detecting interictal epileptiform discharges in routine scalp EEG recordings. METHODS: Thirty-five EEG scorers (EEGers) participated (19 academic and 16 PP) and marked the location of ETs in 200 30-second EEG segments using a web-based EEG annotation system. All participants provided board certification status, years of Epilepsy Fellowship Training (EFT), and years in practice...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30024455/influence-of-the-montage-of-stimulation-electrodes-for-intraoperative-neuromonitoring-during-orthopedic-spine-surgery
#8
Hanneke I Berends, Henricus L Journée
PURPOSE: In transcranial electrical stimulation, induced motor evoked potentials (MEPs) are influenced by the montage of stimulation electrodes. Differences are to be examined between coronal and sagittal stimulation. METHODS: Forty-five patients with idiopathic scoliosis were included. Coronal and sagittal montages were obtained by electrode placement at C3C4 and Cz'F using large contact electrodes. Corkscrew and short needle electrodes were additionally placed at C3C4 in five patients...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/30024454/trigeminal-hyperexcitability-in-idiopathic-intracranial-hypertension-a-blink-reflex-study
#9
Bedia Samanci, Güneş Altıokka-Uzun, Elif Kocasoy Orhan, Esme Ekizoğlu, Ali Emre Öge, Betül Baykan
PURPOSE: To compare blink reflex examination findings in patients with idiopathic intracranial hypertension (IIH) with migraineurs and controls and to investigate the role of blink reflex data in the follow-up by evaluating their relationship with clinical symptoms. METHODS: We included 23 patients with IIH, 15 migraineurs, and 16 controls. Blink reflex was studied with bilateral paired stimulations, and the 2R2/1R2 and 2R2c/1R2c area ratios, 1R2, 2R2, 1R2c, and 2R2c latencies were compared (R2:ipsilateral R2 response, R2c:contralateral R2 response)...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29944600/dermatomal-versus-mixed-somatosensory-evoked-potentials-in-the-diagnosis-of-lumbosacral-spinal-canal-stenosis
#10
Zainab M Essa, Ali F Al-Hashimi, Ihssan S Nema
PURPOSE: The existing literature on the use of dermatomal somatosensory evoked potentials in lumbosacral spinal canal stenosis is limited. The goal of this study was to evaluate the role of dermatomal against mixed tibial somatosensory evoked potential (SEP) as a complementary procedure to imaging studies in the diagnosis of lumbosacral stenosis. METHODS: Thirty patients with clinically and radiologically diagnosed lumbosacral stenosis and 20 normal individuals were enrolled in the study...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29933262/factors-associated-with-inadequate-intraoperative-baseline-lower-extremity-somatosensory-evoked-potentials
#11
Jonathan H Chen, Parastou Shilian, Justin Cheongsiatmoy, Andres A Gonzalez
PURPOSE: Intraoperative neurophysiologic monitoring involves the use of various modalities, including somatosensory evoked potentials (SEP), to assess the integrity of the at-risk nervous system during surgeries. Reliable baseline tracings are important because they are data against which future tracings are compared to detect potential injury. In some cases, adequate baselines may be difficult to achieve. Therefore, we analyzed several patient-specific factors to determine which variables are associated with inadequate intraoperative SEP baseline signals...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29933261/semiautomated-spike-detection-software-persyst-13-is-noninferior-to-human-readers-when-calculating-the-spike-wave-index-in-electrical-status-epilepticus-in-sleep
#12
Charuta N Joshi, Kevin E Chapman, Joshua J Bear, Scott B Wilson, Diana J Walleigh, Mark L Scheuer
PURPOSE: Our objective was to use semiautomatic methods for calculating the spike-wave index (SWI) in electrical status epilepticus in slow-wave sleep (ESES) and to determine whether this calculation is noninferior to human experts (HEs). METHODS: Each HE marked identical 300-second epochs for all spikes and calculated the SWI in sleep EEGs of patients diagnosed with ESES. Persyst 13 was used to mark spikes (high sensitivity setting) in the same 300-second epochs marked by HEs...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29877909/comparison-of-transcranial-motor-evoked-potential-amplitude-responses-between-intramuscular-and-subcutaneous-needles-in-proximal-thigh-muscle
#13
Andres A Gonzalez, Justin Cheongsiatmoy, Parastou Shilian, Pooja Parikh
PURPOSE: Successful intraoperative neurophysiological monitoring is predicated on the presence of adequate baseline-evoked potentials. We have observed that transcranial motor evoked potentials (TcMEPs) yield more robust responses in the distal muscles compared with proximal muscles. One possible explanation is the distance from the needle to the muscle generator. In this study, we investigate whether TcMEP amplitudes from the rectus femoris muscle are affected by changes in needle length...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29851686/electroencephalographic-and-electrocardiographic-effect-of-intravenous-lacosamide-in-refractory-focal-epilepsy
#14
Chin-Wei W Huang, Suzan Brown, Neelan Pillay, Martin Del Campo, Jose Tellez-Zenteno, Richard S McLachlan
PURPOSE: Lacosamide selectively enhances slow inactivation of voltage-gated sodium channels to achieve seizure reduction. We studied the effect of intravenous lacosamide given as one of three single doses on EEG and electrocardiogram, as well as its tolerability in patients with drug-resistant epilepsy. METHODS: This Canadian, investigator-initiated, multicenter, double-blind study recruited patients with refractory focal epilepsy admitted to a seizure monitoring unit...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29847438/clinical-significance-of-a-waves-in-acute-inflammatory-demyelinating-polyradiculoneuropathy
#15
Sindhuja Lakshminarasimhan, Chandramouleeswaran Venkatraman, Kannan Vellaichamy, Lakshminarasimhan Ranganathan
PURPOSE: A wave is a late response recognized during recording of F waves. Though they might be seen in healthy subjects, their presence assumes significance in a patient presenting with polyradiculoneuropathy. METHODS: In this prospective study, 75 patients with acute inflammatory demyelinating polyradiculoneuropathy (AIDP) were enrolled. They were divided into two groups based on the presence or absence of A waves. Clinical features, electrophysiological parameters and extent of clinical recovery in short-term follow-up were analyzed...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29794616/dynamic-preictal-discharges-in-patients-with-mesial-temporal-lobe-epilepsy
#16
Jia Chen, Liping Li, Dongyan Wu, Xiaoxuan Li, Qing Xue, Liying Wang, Jialin Du, Di Wang, Minjing Hu, Liankun Ren, Yuping Wang
PURPOSE: It has been challenging to detect early changes preceding seizure onset in patients with epilepsy. This study investigated the preictal discharges (PIDs) by intracranial electroencephalogram of 11 seizures from 7 patients with mesial temporal lobe epilepsy. METHODS: The EEG segments consisting of 30 seconds before ictal onset and 5 seconds after ictal onset were selected for analysis. After PID detection, the amplitude and interval were measured. According to the timing of PID onset, the 30-second period preceding seizure onset was divided into two stages: before PID stage and PID stage...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29649014/structural-mri-correlates-of-cognitive-event-related-potentials-in-multiple-sclerosis
#17
Artemios K Artemiadis, Maria C Anagnostouli, Ioannis G Zalonis, Konstantinos G Chairopoulos, Nikos I Triantafyllou
PURPOSE: Cognitive impairment in multiple sclerosis has been associated with cognitive event-related potentials and MRI abnormalities. This study aims to explore for the first time the association between P300 and MRI in multiple sclerosis. METHODS: Fifty-eight relapsing-remitting patients (41.5 ± 10.5 years old, 41 women, disease duration 139.7 ± 84.9 months) and 51 healthy controls were used. Visual P300 responses and a set of 2- or 3-dimensional MRI indices were obtained...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29533307/does-continuous-video-eeg-in-patients-with-altered-consciousness-improve-patient-outcome-current-evidence-and-randomized-controlled-trial-design
#18
Andrea O Rossetti, Kaspar Schindler, Vincent Alvarez, Raoul Sutter, Jan Novy, Mauro Oddo, Loane Warpelin-Decrausaz, Stephan Rüegg
Continuous video-EEG is recommended for patients with altered consciousness; as compared to routine EEG (lasting <30 minutes), it improves seizure detection, but is time- and resource-consuming. Although North American centers increasingly implement continuous video-EEG, most other (including European) hospitals have insufficient resources. Only one study suggested that continuous video-EEG could improve outcome in adults, and recent assessments challenge this view. This article reviews current evidence on the added value for continuous video-EEG in clinical terms and describes a design for a prospective study...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29023305/insights-into-the-therapeutic-effect-of-responsive-neurostimulation-assessed-with-scalp-eeg-recording-a-case-report
#19
Maria Jose Bruzzone, Naoum Issa, Sandra Rose, Peter Warnke, Vernon L Towle, James X Tao, Shasha Wu
The responsive neurostimulation system (RNS) is the first closed-loop neurostimulator approved as an adjunctive treatment for adults with medically refractory focal epilepsy from no more than two seizure foci. In addition to its therapeutic effect, it provides chronic intracranial EEG recordings, with limited storage capacity. Long-term monitoring with scalp EEG recordings can provide additional information regarding seizure patterns, the efficacy of RNS stimulation in aborting individual seizures, and the net effect of RNS on seizure control...
September 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29979290/multimodal-approach-to-decision-to-treat-critically-ill-patients-with-periodic-or-rhythmic-patterns-using-an-ictal-interictal-continuum-spectral-severity-score
#20
Gregory Kapinos, Eugen Trinka, Peter W Kaplan
We propose a comprehensive review of the subject of epileptiform and potentially harmful EEG patterns that lie on the interictal continuum (IIC) to help with therapeutic decision-making and target future research. This approach to "electro-physiological SE" encompasses five dimensions of the IIC: it characterizes a periodic or rhythmic pattern, not only regarding its ictal morphology and potential harm with secondary neuronal injury, but also addresses the "metabolic footprint," clinical repercussion, and epileptogenic potential...
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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