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

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https://www.readbyqxmd.com/read/28682826/misleading-eeg-lateralization-associated-with-midline-shift
#1
Gena R Ghearing, Sergiu Abramovici, Alexandra Popescu, Maria E Baldwin
Midline discharges, lateralized periodic discharges, and seizures have been described with ipsilateral lesions that result in midline shift (MLS). Periodic discharges and seizures arising contralateral to a known lesion have not previously been described as a sign of MLS. We present four patients with focal brain lesions, resulting in MLS and epileptiform discharges arising from the contralateral hemisphere. Patient 1 underwent a right anterior temporal lobectomy. On postoperative day 2, computed tomography demonstrated a right to left MLS of 12 mm, and EEG was remarkable for left temporal nonconvulsive status epilepticus...
July 4, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28665820/magnetoencephalographic-recordings-in-infants-using-a-standard-sized-array-technical-adequacy-and-diagnostic-yield
#2
Sumiya Shibata, John C Mosher, Prakash Kotagal, Ajay Gupta, Andreas V Alexopoulos, Richard C Burgess
PURPOSE: Although a few magnetoencephalography (MEG) systems have been built specifically for infants (<2 years), most children are routinely examined using MEG systems designed primarily to accommodate adult subjects. The practicality of the adult MEG device has not been systematically reviewed in infants with epilepsy. The aim of this study is to investigate whether infant epilepsy patients, whose heads are small relative to the sensor helmet, can have clinically successful MEG recordings using the conventional adult-size MEG device...
June 29, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28650411/recording-fewer-than-20-potential-pairs-with-sfemg-may-suffice-for-the-diagnosis-of-myasthenia-gravis
#3
Alon Abraham, Ari Breiner, Carolina Barnett, Hans D Katzberg, Vera Bril
PURPOSE: Our aim in the current study was to determine the minimum number of SFEMG potential pairs required to confirm neuromuscular junction impairment and relate this number to disease severity. METHODS: Ninety-four patients with myasthenia gravis (MG) attending the neuromuscular clinic from February 2013 to November 2015 were included. The SFEMG sensitivity was determined for each number of recorded pairs up to 20. In addition, we compared clinical and electrophysiologic characteristics between patients with abnormality within the first 3, 4 to 7, and ≥8 recorded pairs to determine whether this number is associated with disease severity...
June 20, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28574952/the-hippocampus-and-cortex-together-generate-the-scalp-eeg-ictal-discharge-in-temporal-lobe-epilepsy
#4
David G Vossler, Diana L Kraemer, Anthony J Bell
PURPOSE: The scalp EEG ictal discharge in temporal lobe epilepsy is reportedly visible only after the intracranial discharge becomes well synchronized and present over 10 to 30 cm of cortex. We investigated the role of the hippocampal formation in the generation of the scalp EEG ictal discharge. METHODS: Intracranial EEG video monitors were recorded using simultaneous scalp, stereotaxic depth, and subdural strip electrodes in 19 subjects with temporal lobe epilepsy...
May 30, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28557906/ultrasound-imaging-of-median-nerve-conduit-in-a-patient-with-persistent-median-nerve-symptoms
#5
Santoshi Billakota, David S Ruch, Lisa D Hobson-Webb
Peripheral nerve injury can be reconstructed using composite polymer nerve autografts, but the sonographic appearance of nerve wraps and conduits have not been well documented. This case report describes the sonographic findings in a 42-year-old woman with bilateral carpal tunnel syndrome status post nerve repair with a conduit. The cross-sectional area of the left median nerve was 24 mm at the carpal tunnel inlet and 5 mm at the forearm. The wrist to forearm ratio was 4.8. There was a hypoechoic space surrounding the nerve that was 1...
May 25, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28557905/ssep-in-therapeutic-hypothermia-era
#6
Carolina B Maciel, Adeolu O Morawo, Ching Y Tsao, Teddy S Youn, Douglas R Labar, Elayna O Rubens, David M Greer
PURPOSE: The reliability of somatosensory evoked potentials (SSEPs) in predicting outcome in comatose survivors of cardiac arrest treated with therapeutic hypothermia (TH) has been questioned. We investigated whether the absence of cortical (N20) responses was a reliable predictor of a nonawakening in the setting of TH. METHODS: A retrospective review was conducted in cardiac arrest survivors treated with TH admitted to a single tertiary care hospital from April, 2010 to March, 2013 who underwent SSEP testing at various time points after cardiac arrest...
May 25, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28557904/characteristics-of-eeg-seizure-onset-patterns-recorded-from-subdural-electrodes-over-mri-visible-frontal-focal-cortical-dysplasia-type-iib-lesions
#7
Daisuke Hirozawa, Kiyohito Terada, Kazumi Matsuda, Keiko Usui, Naotaka Usui, Takayasu Tottori, Akihiko Kondo, Yasukiyo Araki, Yoshio Omote, Yumi Kashida, Hideki Mochizuki, Yushi Inoue
PURPOSE: Focal cortical dysplasia (FCD) is intrinsically epileptogenic, and an MRI-visible lesion typically constitutes the core part of the epileptogenic zone. We aimed to identify ictal EEG patterns that represent the epileptogenic zone by using subdural electrodes placed over the MRI-visible FCD lesion. METHODS: We selected seven patients with frontal lobe epilepsy caused by pathologically proven FCD type IIb who underwent preoperative intracranial EEG evaluation with subdural electrodes followed by resection surgery with seizure-free outcome...
May 25, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28520632/disruption-of-brain-heart-coupling-in-sepsis
#8
Marjolein M Admiraal, Emily J Gilmore, Michel J A M Van Putten, Hitten P Zaveri, Lawrence J Hirsch, Nicolas Gaspard
PURPOSE: To investigate heart rate and EEG variability and their coupling in patients with sepsis and determine their relationship to sepsis severity and severity of sepsis-associated brain dysfunction. METHODS: Fifty-two patients with sepsis were prospectively identified, categorized as comatose (N = 30) and noncomatose (N = 22), and compared with 11 control subjects. In a 30-minute EEG and electrocardiogram recording, heart rate variability and EEG variability (measured by the variability of relative power in a modified alpha band = RAP) and their coupled oscillations were quantified using linear (least-square periodogram and magnitude square coherence) and nonlinear (Shannon entropy and mutual information) measures...
May 16, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28520631/operculo-insular-epilepsy-scalp-and-intracranial-electroencephalographic-findings
#9
Ariel Levy, Thi Phuoc Yen Tran, Olivier Boucher, Alain Bouthillier, Dang Khoa Nguyen
PURPOSE: Operculo-insular seizures are heterogeneous and may resemble seizures originating from the temporal, frontal, or parietal lobe. Although surface and invasive EEG recordings are often necessary to detect operculo-insular seizures, electrophysiological features of operculo-insular epilepsies remain poorly characterized. This study describes the EEG findings of patients with operculo-insular epilepsy. METHODS: We reviewed electrophysiological data of all patients (n = 9) with operculo-insular seizures revealed by intracranial EEG and for whom operculo-insular epilepsy was confirmed by good seizure outcome after resective or radiosurgery at our center between 2005 and 2013...
May 16, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28520630/diagnostic-yield-of-routine-electroencephalography-with-concurrent-video-recording-in-detecting-interictal-epileptiform-discharges-in-relation-to-reasons-for-request-a-prospective-study-of-1-080-video-electroencephalograms
#10
Laia Grau-López, Marta Jiménez, Jordi Ciurans, Sonia Barambio, Alejandra Fumanal, Juan L Becerra
PURPOSE: The aim of this study was to prospectively analyze the sensitivity and specificity of routine electroencephalography with concurrent video recording (vEEG) in relation to the reasons for requesting the test and to investigate when routine vEEG should be requested. METHODS: We prospectively analyzed 1,080 consecutive vEEGs performed between April 2015 and April 2016. The requests for vEEG were classified as requests with a low suspicion of epilepsy (syncope, confusion or delirium, suspicion of psychogenic nonepileptic seizures, and paroxysmal focal neurological deficit) or requests with a high suspicion of epilepsy (first clinical seizure, suspected status epilepticus, follow-up study of a patient with epilepsy, and acute symptomatic seizures)...
May 16, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28445179/a-question-worth-asking
#11
Iván Sánchez Fernández, Tobias Loddenkemper
No abstract text is available yet for this article.
April 25, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28445178/familial-hemiplegic-migraine-with-asymmetric-encephalopathy-secondary-to-atp1a2-mutation-a-case-series
#12
Olwen C Murphy, Aine Merwick, Olivia OʼMahony, Aisling M Ryan, Brian McNamara
INTRODUCTION: Familial hemiplegic migraine (FHM) is a genetic disease with a variable clinical phenotype. The imaging and electroencephalogram (EEG) correlates of FHM are not well described. CASE SERIES: We describe a case series of five young women aged 12 to 32 years. Each case presented with headache, encephalopathy, and hemiparesis of varying severity. One patient developed seizures. All patients improved spontaneously. INVESTIGATIONS: Asymmetric slow-wave activity was seen on electroencephalogram in each case...
April 25, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644823/eeg-characteristics-in-cooled-and-rewarmed-periods-in-post-cardiac-arrest-therapeutic-hypothermia-patients
#13
K Kim, Kimberly L Pargeon, Amy S Labar, Oren Friedman, Padmaja N Kandula, Douglas R Labar
PURPOSE: Continuous video EEG is a tool to assess brain function in injuries, including cardiac arrest (CA). In post-CA therapeutic hypothermia (TH) studies, some EEG features are linked to poor prognosis, but the evolvement of EEG characteristics during two temperature phases and its significance is unclear. We systematically analyzed EEG characteristics in cooled and rewarmed phases of post-CA therapeutic hypothermia patients and investigated their correlation to patient outcome. METHODS: This is a retrospective study of EEG analyses, from a single academic center, of 20 patients who underwent CA and therapeutic hypothermia...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644204/hearing-safety-from-single-and-double-pulse-transcranial-magnetic-stimulation-in-children-and-young-adults
#14
Sahana N Kukke, Carmen C Brewer, Christopher Zalewski, Kelly A King, Diane Damiano, Katharine E Alter, Mark Hallett
PURPOSE: Concerns regarding hearing safety have limited the number of studies using transcranial magnetic stimulation (TMS) in children and young adults. The objective of this study was to examine the safety of TMS with regards to hearing in a group of 16 children and young adults (17.3 ± 4.9 years) with and without brain injury. METHODS: Pure-tone hearing thresholds and distortion-product otoacoustic emissions were measured before and after exposure to single- and paired-pulse TMS (1-2 sessions of 149-446 TMS pulses at a median of 49%-100% maximum stimulator output over a 2...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644203/invasive-investigation-of-insular-cortex-epilepsy
#15
Philippe Ryvlin, Fabienne Picard
Invasive long-term EEG investigations of the insula have been performed since the mid-nineties in an expanding range of focal epilepsies suspected to involve the insular cortex. The various clinical forms of insular epilepsies were delineated during the last 2 decades, and include the following presentations: perisylvian epilepsy, temporal plus epilepsy, sleep hypermotor epilepsy, MRI-negative frontal and parietal lobe epilepsies, and insular lesions. In fact, a majority of complex stereoelectroencephalography procedures will include at least one electrode targeting the insula...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644202/the-insula-in-temporal-plus-epilepsy
#16
Carmen Barba, Lorella Minotti, Anne-Sophie Job, Philippe Kahane
Temporal lobe epilepsy (TLE) surgery is the most common type of surgical treatment offered to patients with drug-resistant focal seizures. However, the proportion of patients experiencing long-term freedom from seizures after TLE surgery remains suboptimal. Temporal plus epilepsy, which is characterized by a primary temporal epileptogenic zone extending to neighboring regions, has been demonstrated to be a major predictor of TLE surgery failures. In the context of the temporoperisylvian epilepsies, i.e., the most common type of temporal plus epilepsy, a possible role of the insula has often been hypothesized...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644201/insular-epilepsy-semiology-and-noninvasive-investigations
#17
Sami Obaid, Younes Zerouali, Dang Khoa Nguyen
In this review, authors discuss the semiology and noninvasive investigations of insular epilepsy, an underrecognized type of epilepsy, which may mimic other focal epilepsies. In line with the various functions of the insula and its widespread network of connections, insular epilepsy may feature a variety of early ictal manifestations from somatosensory, visceral, olfactory, gustatory, or vestibular manifestations. Depending on propagation pathways, insular seizures may also include altered consciousness, dystonic posturing, complex motor behaviors, and even autonomic features...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644200/electrical-stimulations-of-the-human-insula-their-contribution-to-the-ictal-semiology-of-insular-seizures
#18
Laure Mazzola, François Mauguière, Jean Isnard
INTRODUCTION: Stereotactic stimulations of the insular cortex through intracranial electrodes aim at characterizing the semiology of insular seizures. These stimulations, carried out in the context of Stereo-Electro-Encephalography (SEEG) during presurgical monitoring of epilepsy, reproduce the ictal symptoms observed during the development of insular seizures. METHODS: The authors reviewed the results of insular stimulations performed in 222 patients admitted between 1997 and 2015 for presurgical SEEG exploration of atypical temporal or perisylvian epilepsy...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644199/structure-and-function-of-the-human-insula
#19
Lucina Q Uddin, Jason S Nomi, Benjamin Hébert-Seropian, Jimmy Ghaziri, Olivier Boucher
The insular cortex, or "Island of Reil," is hidden deep within the lateral sulcus of the brain. Subdivisions within the insula have been identified on the basis of cytoarchitectonics, sulcal landmarks, and connectivity. Depending on the parcellation technique used, the insula can be divided into anywhere between 2 and 13 distinct subdivisions. The insula subserves a wide variety of functions in humans ranging from sensory and affective processing to high-level cognition. Here, we provide a concise summary of known structural and functional features of the human insular cortex with a focus on lesion case studies and recent neuroimaging evidence for considerable functional heterogeneity of this brain region...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28644198/insular-cortex-epilepsy-exploring-the-treasure-island-of-reil
#20
Dang K Nguyen
No abstract text is available yet for this article.
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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