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https://www.readbyqxmd.com/read/28332484/multivariate-regression-methods-for-estimating-velocity-of-ictal-discharges-from-human-microelectrode-recordings
#1
Jyun-You Liou, Elliot Smith, Lisa Bateman, Guy McKhann, Robert Goodman, Bradley Greger, Tyler Davis, Spencer Kellis, Paul House, Catherine Schevon
OBJECTIVE: Epileptiform discharges, an electrophysiological hallmark of seizures, can propagate across cortical tissue in a manner similar to traveling waves. Recent work has focused attention on the origination and propagation patterns of these discharges, yielding important clues to their source location and mechanism of travel. However, systematic studies of methods for measuring propagation are lacking. APPROACH: We analyzed epileptiform discharges in microelectrode array recordings of human seizures...
March 23, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28327685/recurrence-risk-of-febrile-seizures-in-children
#2
J Agrawal, P Poudel, G S Shah, S Yadav, S Chaudhary, S Kafle
BACKGROUND: Identifying children with febrile seizure who are at risk for recurrence is important so that special attention can be given to them. The objective of this study was to identify the risk factors for recurrence of febrile seizures in children. METHODS: This prospective hospital based study was conducted from July 2013 to August 2014 'among children of 6 months to 6 years of age at Bishweshwar Prasad Koirala Institute of Health Sciences (BPKIHS), Nepal...
September 2016: Journal of Nepal Health Research Council
https://www.readbyqxmd.com/read/28323659/stimulus-induced-rhythmic-periodic-or-ictal-discharges-in-coma-incidence-and-interrater-reliability-of-continuous-eeg-after-a-standard-stimulation-protocol-a-prospective-study
#3
Khalid A Alsherbini, Joao Mc-OʼNeil Plancher, David M Ficker, Brandon P Foreman, Opeolu M Adeoye, Jun Ying, Michael D Privitera
PURPOSE: Stimulus-induced rhythmic, periodic, or ictal discharges (SIRPIDs) are often seen during continuous electroencephalographic (cEEG) monitoring in coma. Given their uncertain clinical significance, our prospective study evaluated incidence of SIRPIDs in comatose patients in the neuroscience intensive care unit (NSICU) who underwent a standard stimulation protocol and defined interreader reliability for cEEG. METHODS: Of 146 patients prospectively screened who underwent cEEG during a 6-month period, 53 patients were included and 93 patients were excluded...
March 17, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28322026/objective-3d-surface-evaluation-of-intracranial-electrophysiologic-correlates-of-cerebral-glucose-metabolic-abnormalities-in-children-with-focal-epilepsy
#4
Jeong-Won Jeong, Eishi Asano, Vinod Kumar Pilli, Yasuo Nakai, Harry T Chugani, Csaba Juhász
To determine the spatial relationship between 2-deoxy-2[(18) F]fluoro-D-glucose (FDG) metabolic and intracranial electrophysiological abnormalities in children undergoing two-stage epilepsy surgery, statistical parametric mapping (SPM) was used to correlate hypo- and hypermetabolic cortical regions with ictal and interictal electrocorticography (ECoG) changes mapped onto the brain surface. Preoperative FDG-PET scans of 37 children with intractable epilepsy (31 with non-localizing MRI) were compared with age-matched pseudo-normal pediatric control PET data...
March 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28314978/can-developmental-venous-anomalies-cause-seizures
#5
Claire Dussaule, Pascal Masnou, Ghaïdaa Nasser, Frédérique Archambaud, Cécile Cauquil-Michon, Jean-Paul Gagnepain, Viviane Bouilleret, Christian Denier
Developmental venous anomalies (DVAs) are congenital anatomical variants of normal venous drainage of normal brain. Although DVAs are often discovered on the occasion of a seizure, their involvement in epilepsy is poorly studied. Our objective was to determine whether DVA can cause seizures, in the cases where there is no associated lesion, including no cavernoma or dysplasia. Based on clinical history, cerebral MRI, EEG recording, and (18)F-FDG PET, we report 4 patients with DVA revealed by seizures. The first patient had a convulsive seizure caused by a hemorrhagic infarction due to thrombosis of her DVA...
March 17, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28303256/recurring-functional-interactions-predict-network-architecture-of-interictal-and-ictal-states-in-neocortical-epilepsy
#6
Ankit N Khambhati, Danielle S Bassett, Brian S Oommen, Stephanie H Chen, Timothy H Lucas, Kathryn A Davis, Brian Litt
Human epilepsy patients suffer from spontaneous seizures, which originate in brain regions that also subserve normal function. Prior studies demonstrate focal, neocortical epilepsy is associated with dysfunction, several hours before seizures. How does the epileptic network perpetuate dysfunction during baseline periods? To address this question, we developed an unsupervised machine learning technique to disentangle patterns of functional interactions between brain regions, or subgraphs, from dynamic functional networks constructed from approximately 100 h of intracranial recordings in each of 22 neocortical epilepsy patients...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28300030/hemispheric-polymicrogyria-and-neonatal-seizures-a-potentially-life-threatening-combination
#7
Paula M Brna, A Simon Harvey, Richard J Leventer
Polymicrogyria (PMG) is a heterogeneous malformation of cortical development characterized by excessive gyration and abnormal cortical lamination. Typically, bilateral forms have more severe developmental delay and early-onset epilepsy, but the full spectrum of severity remains ill-defined. We report two cases of right hemispheric PMG and neonatal-onset, drug-resistant seizures culminating in early death. Case 1 began having seizures on Day 1 of life that intensified in severity and proved resistant to numerous antiepileptic drugs...
March 14, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28298843/ictal-asystole-a-rare-cardiac-manifestation-of-temporal-lobe-epilepsy-treated-with-epilepsy-surgery
#8
Shreyas Hasmukh Ravat, Amit Ashok Bhatti, Mansi Viraj Shah, Dattatraya P Muzumdar, Sangeeta Hasmukh Ravat
Seizures are associated with fascinatingly varied cardiac and autonomic manifestations, of which ictal tachycardia is common, and asystole and bradycardia are rare. Ictal asystole (IA), an often unsought autonomic phenomenon, occurs most commonly with temporal followed by frontal lobe seizures. Prolonged IA may lead to cerebral anoxic ischemia. As the mysteries of sudden unexplained death in epilepsy are unraveled, it is quite possible that the key to it lays within these seizure-induced cardiac rhythm abnormalities...
January 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28289175/teaching-neuroimages-a-spiritual-visual-hallucination-from-a-right-parieto-occipital-seizure-ictal-guardian-angel
#9
Victoria S S Wong, Marissa A Kellogg
No abstract text is available yet for this article.
March 14, 2017: Neurology
https://www.readbyqxmd.com/read/28287069/ictus-emeticus-presenting-as-an-unusual-seizure-type-in-chromosome-22q11-2-deletion-syndrome
#10
Pi-Lien Hung, Li-Tung Huang, Shang-Yeong Kwan, Kai-Ping Chang, Hsin-Hung Chen, Yi-Yen Lee, Hueng-Chuen Fan, Chien Chen
We present a case study of a patient with chromosome 22q11.2 deletion syndrome presenting with ictus emeticus, together with a review of the relevant literature. The patient developed generalized tonic-clonic seizures at 3 months old, and seizures eventually remitted after calcium therapy. He then experienced vigorous vomiting that occurred during sleep, with glassy eyes and legs flexion. Video-EEG recordings exhibited a switch in background activity from organized reactivity during normal sleep to left lateralized temporal delta activity, which was bilaterally synchronized during an emetic attack...
March 8, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28286918/altered-effective-connectivity-network-in-childhood-absence-epilepsy-a-multi-frequency-meg-study
#11
Caiyun Wu, Jing Xiang, Wenwen Jiang, Shuyang Huang, Yuan Gao, Lu Tang, Yuchen Zhou, Di Wu, Qiqi Chen, Zheng Hu, Xiaoshan Wang
Using multi-frequency magnetoencephalography (MEG) data, we investigated whether the effective connectivity (EC) network of patients with childhood absence epilepsy (CAE) is altered during the inter-ictal period in comparison with healthy controls. MEG data from 13 untreated CAE patients and 10 healthy controls were recorded. Correlation analysis and Granger causality analysis were used to construct an EC network at the source level in eight frequency bands. Alterations in the spatial pattern and topology of the network in CAE were investigated by comparing the patients with the controls...
March 12, 2017: Brain Topography
https://www.readbyqxmd.com/read/28282552/periictal-activity-in-cooled-asphyxiated-neonates-with-seizures
#12
Philippe Major, Anne Lortie, Mathieu Dehaes, Gregory Anton Lodygensky, Anne Gallagher, Lionel Carmant, Ala Birca
PURPOSE: Seizures are common in critically ill neonates. Both seizures and antiepileptic treatments may lead to short term complications and worsen the outcomes. Predicting the risks of seizure reoccurrence could enable individual treatment regimens and better outcomes. We aimed to identify EEG signatures of seizure reoccurrence by investigating periictal electrographic features and spectral power characteristics in hypothermic neonates with hypoxic-ischemic encephalopathy (HIE) with or without reoccurrence of seizures on rewarming...
March 2, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28281109/neuropeptides-as-a-marker-for-chronic-headache
#13
REVIEW
Nuria Riesco, Eva Cernuda-Morollón, Julio Pascual
PURPOSE OF REVIEW: The purpose of this review is to revise current evidence on trigemino-vascular system (TVS) neuropeptides as potential biomarkers for chronic primary headaches, mainly for chronic migraine (CM). RECENT FINDINGS: Within sensory neuropeptides, released by an activated trigeminal nerve, calcitonin gene-related peptide (CGRP) levels seem to be a good biomarker of acute migraine and somewhat sensitive and specific for CM. CGRP, however, is not increased in 20-30% of CM patients, which suggests that CGRP is not the only neuropeptide involved in migraine pain generation and maintenance...
April 2017: Current Pain and Headache Reports
https://www.readbyqxmd.com/read/28281007/seizure-outcomes-of-temporal-lobe-epilepsy-surgery-in-patients-with-normal-mri-and-without-specific-histopathology
#14
Jugoslav Ivanovic, Pål G Larsson, Ylva Østby, John Hald, Bård K Krossnes, Jan G Fjeld, Are H Pripp, Kristin Å Alfstad, Arild Egge, Milo Stanisic
BACKGROUND: Seizure outcome following surgery in pharmacoresistant temporal lobe epilepsy patients with normal magnetic resonance imaging and normal or non-specific histopathology is not sufficiently presented in the literature. METHODS: In a retrospective design, we reviewed data of 263 patients who had undergone temporal lobe epilepsy surgery and identified 26 (9.9%) who met the inclusion criteria. Seizure outcomes were determined at 2-year follow-up. Potential predictors of Engel class I (satisfactory outcome) were identified by logistic regression analyses...
March 9, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28271336/the-relationship-between-headaches-with-epileptic-and-non-epileptic-seizures-a-narrative-review
#15
REVIEW
William S Kingston, Todd J Schwedt
PURPOSE OF REVIEW: The purpose of this review is to examine the relationship between headaches and epilepsy as well as headaches and psychogenic non-epileptic seizures (PNES). Emphasis was placed on clinical characteristics, pathophysiology, and treatment. RECENT FINDINGS: Epilepsy and headaches are common disorders that co-occur more often than would be expected by chance. There are some overlapping clinical features between migraine and epilepsy as well as evidence for shared underlying mechanisms...
March 2017: Current Pain and Headache Reports
https://www.readbyqxmd.com/read/28269702/predicting-seizures-from-local-field-potentials-recorded-via-intracortical-microelectrode-arrays
#16
Mehdi Aghagolzadeh, Leigh R Hochberg, Sydney S Cash, Wilson Truccolo
The need for new therapeutic interventions to treat pharmacologically resistant focal epileptic seizures has led recently to the development of closed-loop systems for seizure control. Once a seizure is predicted/detected by the system, electrical stimulation is delivered to prevent seizure initiation or spread. So far, seizure prediction/detection has been limited to tracking non-invasive electroencephalogram (EEG) or intracranial EEG (iEEG) signals. Here, we examine seizure prediction based on local field potentials (LFPs) from a small neocortical patch recorded via a 10×10 microelectrode array implanted in a patient with focal seizures...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269285/eeg-analysis-via-multiscale-lempel-ziv-complexity-for-seizure-detection
#17
N Sertac Artan
Robust seizure detection and seizure prediction continues to be a challenge. Lempel-Ziv Complexity (LZC) is one of the features that has shown to be relevant in seizure detection. Recent work has shown that augmenting LZC can be beneficial to emphasize variations in amplitude or frequency when analyzing biomedical signals. In this paper, we present a first look into evaluating the feasibility of using a recently proposed feature stemmed from LZC, namely the Multiscale Lempel-Ziv Complexity (MLZC) for seizure detection...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268903/source-and-sink-nodes-in-absence-seizures
#18
Abner C Rodrigues, Birajara S Machado, Luis Otavio S F Caboclo, Andre Fujita, Luiz A Baccala, Koichi Sameshima
As opposed to focal epilepsy, absence seizures do not exhibit a clear seizure onset zone or focus since its ictal activity rapidly engages both brain hemispheres. Yet recent graph theoretical analysis applied to absence seizures EEG suggests the cortical focal presence, an unexpected feature for this type of epilepsy. In this study, we explore the characteristics of absence seizure by classifying the nodes as to their source/sink natures via weighted directed graph analysis based on connectivity direction and strength estimation using information partial directed coherence (iPDC)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268489/predicting-seizures-in-untreated-temporal-lobe-epilepsy-using-point-process-nonlinear-models-of-heartbeat-dynamics
#19
G Valenza, A Romigi, L Citi, F Placidi, F Izzi, M Albanese, E P Scilingo, M G Marciani, A Duggento, M Guerrisi, N Toschi, R Barbieri
Symptoms of temporal lobe epilepsy (TLE) are frequently associated with autonomic dysregulation, whose underlying biological processes are thought to strongly contribute to sudden unexpected death in epilepsy (SUDEP). While abnormal cardiovascular patterns commonly occur during ictal events, putative patterns of autonomic cardiac effects during pre-ictal (PRE) periods (i.e. periods preceding seizures) are still unknown. In this study, we investigated TLE-related heart rate variability (HRV) through instantaneous, nonlinear estimates of cardiovascular oscillations during inter-ictal (INT) and PRE periods...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267062/allodynia-in-cluster-headache
#20
Leopoldine A Wilbrink, Mark A Louter, Onno Pm Teernstra, Erik W van Zwet, Frank Jpm Huygen, Joost Haan, Michel D Ferrari, Gisela M Terwindt
Cutaneous allodynia is an established marker for central sensitization in migraine. There is debate whether cutaneous allodynia may also occur in cluster headache, another episodic headache disorder. Here we examined the presence and severity of allodynia in a large well-defined nation-wide population of people with cluster headache.Using validated questionnaires we assessed, cross-sectionally, ictal allodynia and comorbid depression and migraine in the nation-wide "Leiden University Cluster headache neuro-Analysis" (LUCA) study...
March 4, 2017: Pain
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