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

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https://www.readbyqxmd.com/read/30004913/magnetoencephalographic-recordings-in-infants-a-retrospective-analysis-of-seizure-focus-yield-and-postsurgical-outcomes
#1
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/29944600/dermatomal-versus-mixed-somatosensory-evoked-potentials-in-the-diagnosis-of-lumbosacral-spinal-canal-stenosis
#2
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...
June 25, 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
#3
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...
June 21, 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
#4
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...
June 21, 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
#5
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...
June 5, 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
#6
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...
May 30, 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
#7
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...
May 25, 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
#8
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...
May 22, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29781828/intraoperative-visual-evoked-potentials
#9
David J Anschel
No abstract text is available yet for this article.
May 16, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29771747/diagnostic-utility-of-reduced-electroencephalography
#10
Kapil Gururangan
No abstract text is available yet for this article.
May 15, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29746390/electrophysiology-of-olfactory-and-optic-nerve-in-outpatient-and-intraoperative-settings
#11
Praveen Hariharan, Jeffery R Balzer, Katherine Anetakis, Donald J Crammond, Parthasarathy D Thirumala
No abstract text is available yet for this article.
May 9, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29746391/magnetoencephalographic-mapping-of-epileptic-spike-population-using-distributed-source-analysis-comparison-with-intracranial-electroencephalographic-spikes
#12
Naoaki Tanaka, Christos Papadelis, Eleonora Tamilia, Joseph R Madsen, Phillip L Pearl, Steven M Stufflebeam
INTRODUCTION: This study evaluates magnetoencephalographic (MEG) spike population as compared with intracranial electroencephalographic (IEEG) spikes using a quantitative method based on distributed source analysis. METHODS: We retrospectively studied eight patients with medically intractable epilepsy who had an MEG and subsequent IEEG monitoring. Fifty MEG spikes were analyzed in each patient using minimum norm estimate. For individual spikes, each vertex in the source space was considered activated when its source amplitude at the peak latency was higher than a threshold, which was set at 50% of the maximum amplitude over all vertices...
April 27, 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
#13
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
https://www.readbyqxmd.com/read/29979289/approach-to-managing-periodic-discharges
#14
Andrew Bauerschmidt, Clio Rubinos, Jan Claassen
Use of continuous EEG monitoring in the intensive care unit setting has increased detection of not only subclinical seizures, but also patterns of discharges that have epileptiform features and periodicity yet do not meet the criteria for seizures. These periodic discharges present a clinical challenge: some patterns may reflect brain injury that has already occurred, although there is evidence that some periodic discharges represent an ongoing process causing additional brain injury and necessitate treatment...
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29979288/prognosis-of-periodic-and-rhythmic-patterns-in-adult-and-pediatric-populations
#15
Dalila W Lewis, Emily L Johnson
Although electrographic seizures are known to have an outcome on clinical prognosis, the implications of periodic and rhythmic patterns are less clear. The outcomes of adults with these patterns have been reported and are often poor; however, the outcomes in pediatric populations are less well characterized and may be different than in the adult population, as the etiologies of periodic and rhythmic patterns may differ in children and adults. In adults, generalized periodic discharges are highly associated with toxic-metabolic disturbances, infection, and anoxic injury; 30% to 64% of patients have poor outcomes...
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29979287/the-spectral-footprints-of-periodic-and-rhythmic-patterns
#16
Emily L Johnson, Peter W Kaplan, Eva K Ritzl
Visual displays of quantitative EEG, consisting of mathematical processing of EEG signals for graphical display, are powerful tools to enhance review of raw EEG. Quantitative EEG is widely used for seizure detection and for delayed cerebral ischemia detection, and it improves efficiency of long-term monitoring review. Here, we review the signature "footprints" of periodic and rhythmic patterns on quantitative EEG. While changes in the frequency and rhythmicity shown on quantitative EEG can highlight these patterns, review of raw EEG to evaluate and confirm the pattern is vital...
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29979286/neuroimaging-correlates-of-periodic-discharges
#17
Aline Herlopian, Aaron F Struck, Eric Rosenthal, Brandon M Westover
Despite being first described over 50 years ago, periodic discharges continue to generate controversy as to whether they are always, sometimes, or never "ictal." Investigators and clinicians have proposed adjunctive markers to help clarify this distinction-in particular measures of perfusion and metabolism. Here, we review the growing number of neuroimaging studies using Fluorodeoxyglucose-PET, MRI diffusion, Magnetic resonance perfusion, Single Photon Emission Computed Tomography, and Magnetoencepgalography to gain further insight into the physiology and clinical significance of periodic discharges...
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29979285/ictal-interictal-continuum
#18
Giridhar P Kalamangalam, Bernhard Pohlmann-Eden
The term "ictal-interictal" continuum has seen wide adoption in the critical care EEG domain, referring to the presence of abnormal periodic activity on the scalp EEG variably associated with seizures. The historical origin of the ictal-interictal continuum concept is discussed with a review of known and surmised physiological mechanisms for their origin and relationship to seizures. Therapeutic approaches to patients exhibiting ictal-interictal continuum EEG patterns are reviewed, and some open scientific questions highlighted...
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29979284/introduction-to-periodic-discharges-volume-ii
#19
Emily L Johnson, Peter W Kaplan
No abstract text is available yet for this article.
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29851687/diagnostic-utility-of-electroencephalography
#20
Brandy B Ma, Emily L Johnson, Eva K Ritzl
No abstract text is available yet for this article.
July 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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