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https://www.readbyqxmd.com/read/29769525/asynchronous-suppression-of-visual-cortex-during-absence-seizures-in-stargazer-mice
#1
Jochen Meyer, Atul Maheshwari, Jeffrey Noebels, Stelios Smirnakis
Absence epilepsy is a common childhood disorder featuring frequent cortical spike-wave seizures with a loss of awareness and behavior. Using the calcium indicator GCaMP6 with in vivo 2-photon cellular microscopy and simultaneous electrocorticography, we examined the collective activity profiles of individual neurons and surrounding neuropil across all layers in V1 during spike-wave seizure activity over prolonged periods in stargazer mice. We show that most (~80%) neurons in all cortical layers reduce their activity during seizures, whereas a smaller pool activates or remains neutral...
May 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29765477/detecting-epileptic-seizure-with-different-feature-extracting-strategies-using-robust-machine-learning-classification-techniques-by-applying-advance-parameter-optimization-approach
#2
Lal Hussain
Epilepsy is a neurological disorder produced due to abnormal excitability of neurons in the brain. The research reveals that brain activity is monitored through electroencephalogram (EEG) of patients suffered from seizure to detect the epileptic seizure. The performance of EEG detection based epilepsy require feature extracting strategies. In this research, we have extracted varying features extracting strategies based on time and frequency domain characteristics, nonlinear, wavelet based entropy and few statistical features...
June 2018: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29761953/-epileptic-electroencephalogram-recognition-based-on-discrete-s-transform-and-permutation-entropy
#3
Jianzhao Zhang, Wei Jiang, Hui Yuan, Wei Shang, Shi Liu, Ping Jiao
Electroencephalogram(EEG) analysis has important reference value in the diagnosis of epilepsy. The automatic classification of epileptic EEG can be used to judge the patient's situation in time,which is of great significance in clinical application. In order to solve the problem that the recognition accuracy is not high by using the single feature of EEG signals and avoid the influence of wavelet basis function selection on recognition results,a method of automatic discrimination of epileptic EEG signals based on S transform and permutation entropy is proposed...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29757347/role-of-inhibitory-control-in-modulating-focal-seizure-spread
#4
Jyun-You Liou, Hongtao Ma, Michael Wenzel, Mingrui Zhao, Eliza Baird-Daniel, Elliot H Smith, Andy Daniel, Ronald Emerson, Rafael Yuste, Theodore H Schwartz, Catherine A Schevon
Focal seizure propagation is classically thought to be spatially contiguous. However, distribution of seizures through a large-scale epileptic network has been theorized. Here, we used a multielectrode array, wide field calcium imaging, and two-photon calcium imaging to study focal seizure propagation pathways in an acute rodent neocortical 4-aminopyridine model. Although ictal neuronal bursts did not propagate beyond a 2-3-mm region, they were associated with hemisphere-wide field potential fluctuations and parvalbumin-positive interneuron activity outside the seizure focus...
May 10, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29756008/fabrication-and-modification-of-implantable-optrode-arrays-for-in-vivo-optogenetic-applications
#5
Lulu Wang, Kang Huang, Cheng Zhong, Liping Wang, Yi Lu
<AbstractText Label="Abstract" NlmCategory="UNASSIGNED">Recent advances in optogenetics have established a precisely timed and cell-specific methodology for understanding the functions of brain circuits and the mechanisms underlying neuropsychiatric disorders. However, the fabrication of optrodes, a key functional element in optogenetics, remains a great challenge. Here, we report reliable and efficient fabrication strategies for chronically implantable optrode arrays. To improve the performance of the fabricated optrode arrays, surfaces of the recording sites were modified using optimized electrochemical processes...
2018: Biophysics Reports
https://www.readbyqxmd.com/read/29752227/a-novel-signal-modeling-approach-for-classification-of-seizure-and-seizure-free-eeg-signals
#6
Anubha Gupta, Pushpendra Singh, Mandar Karlekar
This paper presents a signal modeling-based new methodology of automatic seizure detection in EEG signals. The proposed method consists of three stages. First, a multirate filterbank structure is proposed that is constructed using the basis vectors of discrete cosine transform. The proposed filterbank decomposes EEG signals into its respective brain rhythms: delta, theta, alpha, beta, and gamma. Second, these brain rhythms are statistically modeled with the class of self-similar Gaussian random processes, namely, fractional Brownian motion and fractional Gaussian noises...
May 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29751364/ictal-and-interictal-electric-source-imaging-in-presurgical-evaluation-a-prospective-study
#7
Praveen Sharma, Michael Scherg, Lars H Pinborg, Martin Fabricius, Guido Rubboli, Birthe Pedersen, Anne-Mette Leffers, Peter Uldall, Bo Jespersen, Jannick Brennum, Otto Mølby Henriksen, Sándor Beniczky
BACKGROUND: Accurate localization of the epileptic focus is essential for surgical treatment of patients with drug- resistant epilepsy. EEG source imaging (ESI) is increasingly used in presurgical evaluation. However, most previous studies analysed interictal discharges. Prospective studies comparing feasibility and accuracy of interictal (II) and ictal (IC) ESI are lacking. METHODS: We prospectively analysed long-term video EEG recordings (LTM) of patients admitted for presurgical evaluation...
May 11, 2018: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29740014/different-patterns-of-epileptiform-like-activity-are-generated-in-the-sclerotic-hippocampus-from-patients-with-drug-resistant-temporal-lobe-epilepsy
#8
Selvin Z Reyes-Garcia, Carla A Scorza, Noemi S Araújo, Nancy N Ortiz-Villatoro, Anaclara Prada Jardim, Ricardo Centeno, Elza Márcia Targas Yacubian, Jean Faber, Esper A Cavalheiro
Human hippocampal slice preparations from patients with temporal lobe epilepsy (TLE) associated with hippocampal sclerosis (HS) are excellent material for the characterization of epileptiform-like activity. However, it is still unknown if hippocampal regions as cornu Ammonis (CA) 1, CA3 and CA4, generate population epileptiform-like activity. Here, we investigated epileptiform activities of the subiculum, CA1, CA2, CA3, CA4 (induced by elevation of extracellular potassium concentration) and the dentate gyrus (induced with hilar stimulation and elevation of potassium concentration) from sclerotic hippocampi of patients with drug-resistant TLE...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29736224/prognostic-value-of-ictal-onset-patterns-in-postsurgical-outcome-of-temporal-lobe-epilepsy
#9
Jafar Mehvari-Habibabadi, Reza Basiratnia, Houshang Moein, Mohamad Zare, Majid Barakatain, Yahya Aghakhani, Nasim Tabrizi
Background: To investigate ictal onset patterns (IOP) in scalp electroencephalography (EEG) of patients with temporal lobe epilepsy (TLE) and their prognostic effect on the postoperative outcome. Methods: We conducted a retrospective cohort study between 2011 and 2015 in our referral Epilepsy Surgery Center enrolling adult patients with refractory TLE and a visible epileptogenic lesion in magnetic resonance imaging (MRI), who underwent epilepsy surgery. Demographic, clinical and MRI findings were collected and ictal findings during video-EEG monitoring were reviewed in detail...
October 7, 2017: Iranian Journal of Neurology
https://www.readbyqxmd.com/read/29735419/characteristics-of-ictal-eeg-in-magnetic-seizure-therapy-at-various-stimulation-frequencies
#10
Felicity A Backhouse, Yoshihiro Noda, Yuliya Knyahnytska, Faranak Farzan, Jonathan Downar, Tarek K Rajji, Benoit H Mulsant, Zafiris J Daskalakis, Daniel M Blumberger
OBJECTIVES: The first objective of this study aimed to elucidate the relationship between seizure characteristics and Magnetic Seizure Therapy (MST) treatment outcome. The second objective was to determine the effect of stimulation frequency on seizure characteristics. METHODS: Using a between-subjects design, we compared the seizures of patients with unipolar depression receiving MST at three separate stimulation frequencies: 25 Hz (n = 34), 50 Hz (n = 16) and 100 Hz (n = 11)...
April 22, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29729532/how-do-we-diagnose-and-treat-epilepsy-with-myoclonic-atonic-seizures-doose-syndrome-results-of-the-pediatric-epilepsy-research-consortium-survey
#11
Katherine Nickels, Ronald Thibert, Stephanie Rau, Scott Demarest, Elaine Wirrell, Eric H Kossoff, Charuta Joshi, Srishti Nangia, Renee Shellhaas
OBJECTIVE: To obtain and assess opinions on EMAS diagnostic criteria, recommended investigations, and therapeutic options, from a large group of physicians who care for children with EMAS. METHODS: The EMAS focus group of PERC created a survey to assess the opinions of pediatric neurologists who care for children with EMAS regarding diagnosis and treatment of this condition, which was sent to members of PERC, AES, and CNS. A Likert scale was used to assess the respondents' opinions on the importance of diagnostic and exclusion criteria (five point scale), investigations (four point scale), and treatment (six point scale) of EMAS...
April 25, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29727478/assessing-physician-patient-dialogues-about-chronic-migraine-during-routine-office-visits
#12
Dawn C Buse, Patrick Gillard, Kaitlyn Arctander, Amy W Kuang, Richard B Lipton
OBJECTIVE: To assess physician-patient communication and identify the frequency of use of specific communication techniques by analyzing recordings of routinely scheduled medical encounters for patients with clinician-identified chronic migraine. BACKGROUND: Chronic migraine is an under-diagnosed, under-treated, and highly burdensome disease. Effective medical communication is integral to optimal medical care, including providing accurate diagnoses, creating effective treatment plans, and enhancing patient adherence...
May 4, 2018: Headache
https://www.readbyqxmd.com/read/29718832/stimulus-induced-rhythmic-periodic-or-ictal-discharges-sirpids
#13
Emily L Johnson, Peter W Kaplan, Eva K Ritzl
Stimulus-induced rhythmic, periodic, or ictal discharges (SIRPIDs) are a relatively common phenomenon found on prolonged electroencephalogram (EEG) monitoring that captures state changes and stimulation of critically ill patients. Common causes include hypoxic injury, traumatic brain injury, and hemorrhage, as well as toxic-metabolic disturbances. Some studies have shown an association between SIRPIDs and the presence of spontaneous electrographic seizures. Although the degree to which SIRPIDs should be treated with antiepileptic medications is unknown, the rare cases of functional imaging obtained in patients with SIRPIDs have not shown an increase in cerebral blood flow to suggest an active ictal process...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718826/one-or-five-alarm-fire-do-we-call-out-the-fire-engines-or-turn-on-the-sprinklers-an-overview-of-the-ictal-interictal-continuum-and-approaches-to-understanding-the-spectrum-and-treatment
#14
Emily L Johnson, Peter W Kaplan
No abstract text is available yet for this article.
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29700719/influence-of-time-series-normalization-number-of-nodes-connectivity-and-graph-measure-selection-on-seizure-onset-zone-localization-from-intracranial-eeg
#15
Pieter van Mierlo, Octavian Lie, Willeke Staljanssens, Ana Coito, Serge Vulliémoz
We investigated the influence of processing steps in the estimation of multivariate directed functional connectivity during seizures recorded with intracranial EEG (iEEG) on seizure-onset zone (SOZ) localization. We studied the effect of (i) the number of nodes, (ii) time-series normalization, (iii) the choice of multivariate time-varying connectivity measure: Adaptive Directed Transfer Function (ADTF) or Adaptive Partial Directed Coherence (APDC) and (iv) graph theory measure: outdegree or shortest path length...
April 26, 2018: Brain Topography
https://www.readbyqxmd.com/read/29695997/the-anatomo-electrical-network-underlying-hypermotor-seizures
#16
Xiu Wang, Wenhan Hu, Kai Zhang, Xiaoqiu Shao, Yanshan Ma, Lin Sang, Zhong Zheng, Chao Zhang, Junjv Li, Jian-Guo Zhang
Purpose: Hypermotor seizures (HMS) can be triggered by different epileptogenic foci and thus common symptomatic networks generating HMS may exist among these patients. The goal of the present study was to investigate the specialized networks underlying HMS by analyzing interictal 18 FDG-PET imaging and ictal stereo-electroencephalography (SEEG) recordings. Methods: Fourteen patients with HMS were retrospectively analyzed. HMS were classified into HMS1 and HMS2 according to the speed and intensity of the motor seizure behavior...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29692967/can-the-combination-of-hyperthermia-seizures-and-ion-channel-dysfunction-cause-fatal-post-ictal-cerebral-edema-in-patients-with-scn1a-mutations
#17
Carina Büren, Marcel Alexander Kamp, Christopher Munoz-Bendix, Hans-Jakob Steiger, Joachim Windolf, Maxine Dibué-Adjei
A 21-year-old male with an SCN1A mutation died of cerebral herniation 3 h after a seizure occurring during physical activity. Cases of fatal cerebral edema in patients with SCN1A mutations after fever and status epilepticus have been recently reported raising the question whether sodium channel dysfunction may contribute to cerebral edema and thereby contribute to the increased premature mortality in Dravet Syndrome. We report on our patient and discuss whether the combination of hyperthermia and ion channel dysfunction may not only trigger seizures but also a fatal pathophysiological cascade of cerebral edema and herniation leading to cardiorespiratory collapse...
2018: Epilepsy & Behavior Case Reports
https://www.readbyqxmd.com/read/29692963/anterior-corpus-callosotomy-in-patients-with-drug-resistant-epilepsy-invasive-eeg-findings-and-seizure-outcomes
#18
Olga Taraschenko, Swetha Pedavally, Kaeli K Samson, Mark J Puccioni, Deepak Madhavan
Corpus callosotomy (CC) is used in patients with drug-resistant seizures who are not candidates for excisional surgery and failed neurostimulation. We examined ictal scalp and intracranial electroencephalogram (iEEG) recordings in 16 patients being evaluated for anterior CC alone or CC in combination with focal resection, to determine the role of the iEEG in predicting postoperative seizure outcomes. In our cohort, CC improved generalized atonic seizures and focal seizures with impaired awareness but did not alter outcomes for generalized tonic-clonic or tonic seizures...
2018: Epilepsy & Behavior Case Reports
https://www.readbyqxmd.com/read/29686574/urinary-urge-seizure-semiology-localization-by-intracranial-monitoring
#19
Ronak Rengarajan, Sadat Shamim
Seizures may present with many different symptom complexes. Seizure semiologies have localization value when contemplating surgical therapies. Epilepsy presenting as a desire to micturate is exceedingly rare, with only a handful of published cases. We present a patient who had initially unexplained childhood urinary urge that progressed into lapses of memory and confusion that was eventually diagnosed as epilepsy in adulthood. Due to refractoriness to medical management, our patient's epileptic focus was localized through both noninvasive and invasive subdural electrode arrays to the nondominant medial temporal lobe and successfully treated with an amygdalohippocampectomy...
January 2018: Proceedings of the Baylor University Medical Center
https://www.readbyqxmd.com/read/29680731/automatic-ictal-onset-source-localization-in-presurgical-epilepsy-evaluation
#20
Johannes Koren, Gerhard Gritsch, Susanne Pirker, Johannes Herta, Hannes Perko, Tilmann Kluge, Christoph Baumgartner
OBJECTIVE: To test the diagnostic accuracy of a new automatic algorithm for ictal onset source localization (IOSL) during routine presurgical epilepsy evaluation following STARD (Standards for Reporting of Diagnostic Accuracy) criteria. METHODS: We included 28 consecutive patients with refractory focal epilepsy (25 patients with temporal lobe epilepsy (TLE) and 3 with extratemporal epilepsy) who underwent resective epilepsy surgery. Ictal EEG patterns were analyzed with a novel automatic IOSL algorithm...
June 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
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