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Intracranial EEG

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https://www.readbyqxmd.com/read/28434238/the-characteristics-and-long-term-course-of-epilepsy-in-lipoid-proteinosis-a-spectrum-from-mild-to-severe-seizures-in-relation-to-ecm1-mutations
#1
Emel Oguz Akarsu, Firdevs Dinçsoy Bir, Can Baykal, Volkan Taşdemir, Bülent Kara, Nerses Bebek, Candan Gürses, Oya Uyguner, Betül Baykan
Lipoid proteinosis (LP) is a rare autosomal recessive disease characterized by deposition of hyaline material in skin and mucosae. Epilepsy, as an extracutaneous manifestation associated with typical mesial temporal calcifications, has already been identified, but its characteristics and long-term prognosis have not been thoroughly investigated. We included 7 consecutive patients with LP with typical intracranial calcifications out of 16 patients with ECM1 mutations and investigated the semiologic features, ictal and interictal EEG findings, and long-term prognosis of epilepsy in this genodermatosis...
April 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28419327/epilepsy-surgeries-requiring-an-operculoinsular-cortectomy-operative-technique-and-results
#2
Alain Bouthillier, Dang Khoa Nguyen
BACKGROUND: Epilepsy surgeries requiring an operculoinsulectomy pose significant difficulties because the perisylvian area is highly vascular, deep, and functional. OBJECTIVE: To report the operative technique and results of epilepsy surgeries requiring an operculoinsular cortectomy at our institution. METHODS: The data of all consecutive patients who had undergone an epilepsy surgery requiring an operculoinsular cortectomy with a minimum follow-up of 1 yr were reviewed...
April 17, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28414967/pharmacodynamics-of-remifentanil-induced-intracranial-spike-activity-in-mesial-temporal-lobe-epilepsy
#3
Troels Wesenberg Kjaer, Hans Hogenhaven, Andrea P Lee, Flemming Find Madsen, Bo Jespersen, Jannick Brennum, Lennart Derm, Finn Borgbjerg Moltke
Patients with medically refractory epilepsy may benefit from resective epilepsy surgery. However even the best centers experience surgical failures. It is therefore important to find techniques that may aid in neurosurgical planning of epileptic focus resection. Recordings of electrical brain activity with EEG during seizures reveal abnormal cortical hypersynchronization. Between seizures the EEG often shows interictal depolarizing phenomena such as spikes reflecting an irritable focus of the brain. In the present study we investigated the effect of intravenous remifentanil on the spike activity in the temporal neocortex and hippocampus...
March 31, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28410675/the-relationship-between-epileptiform-discharges-and-background-activity-in-the-visual-analysis-of-electroencephalographic-examinations-in-dogs-with-seizures-of-different-etiologies
#4
M Wrzosek, J R Ives, M Karczewski, E Dziadkowiak, E Gruszka
Electroencephalographic (EEG) recordings in 125 outpatient dogs with various epileptiform encephalopathies were acquired under medetomidine sedation using subdermal wire electrodes. The features of canine EEG (background activity [BGA] and epileptiform discharges [EDs]) were assessed, described and compared. The dogs included neurologically healthy controls (N, n = 19), dogs with portosystemic shunt (PSS, n = 9), dogs with intracranial pathologies (IP, n = 27) and dogs with idiopathic epilepsy (IE, n = 70)...
April 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28392760/accelerated-recovery-of-consciousness-after-general-anesthesia-is-associated-with-increased-functional-brain-connectivity-in-the-high-gamma-bandwidth
#5
Duan Li, Viviane S Hambrecht-Wiedbusch, George A Mashour
Recent data from our laboratory demonstrate that high-frequency gamma connectivity across the cortex is present during consciousness and depressed during unconsciousness. However, these data were derived from static and well-defined states of arousal rather than during transitions that would suggest functional relevance. We also recently found that subanesthetic ketamine administered during isoflurane anesthesia accelerates recovery upon discontinuation of the primary anesthetic and increases gamma power during emergence...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28389718/oscillatory-reactivity-to-effortful-cognitive-processing-in-the-subthalamic-nucleus-and-internal-pallidum-a-depth-electrode-eeg-study
#6
Martina Bočková, Jan Chládek, Pavel Jurák, Josef Halámek, Steven Z Rapcsak, Marek Baláž, Jan Chrastina, Ivan Rektor
This study investigates how complex motor-cognitive activities are processed in the subthalamic nucleus (STN) and internal globus pallidum (GPi), as adverse neuropsychiatric effects may accompany deep brain stimulation (DBS), mainly in Parkinson's disease (PD) and STN-DBS. Dystonia patients with GPi-DBS electrodes (n = 5) and PD subjects (n = 5) with STN-DBS electrodes performed two tasks: (1) copying letters; and (2) writing any letter other than that appearing on the monitor. The cognitive load of the second task was greater than that of the first...
April 7, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28387588/modulation-of-oscillatory-power-and-connectivity-in-the-human-posterior-cingulate-cortex-supports-the-encoding-and-retrieval-of-episodic-memories
#7
Bradley Lega, James Germi, Michael Rugg
Existing data from noninvasive studies have led researchers to posit that the posterior cingulate cortex (PCC) supports mnemonic processes: It exhibits degeneration in memory disorders, and fMRI investigations have demonstrated memory-related activation principally during the retrieval of memory items. Despite these data, the role of the PCC in episodic memory has received only limited treatment using the spatial and temporal precision of intracranial EEG, with previous analyses focused on item retrieval. Using data gathered from 21 human participants who underwent stereo-EEG for seizure localization, we characterized oscillatory patterns in the PCC during the encoding and retrieval of episodic memories...
April 7, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28387139/intracortical-electrophysiological-correlates-of-blood-flow-after-severe-sah-a-multimodality-monitoring-study
#8
Brandon Foreman, David Albers, J Michael Schmidt, Cristina Maria Falo, Angela Velasquez, E Sander Connolly, Jan Claassen
Subarachnoid hemorrhage (SAH) is a devastating form of stroke. Approximately one in four patients develop progressive neurological deterioration and silent infarction referred to as delayed cerebral ischemia (DCI). DCI is a complex, multifactorial secondary brain injury pattern and its pathogenesis is not fully understood. We aimed to study the relationship between cerebral blood flow (CBF) and neuronal activity at both the cortex and in scalp using electroencephalography (EEG) in poor-grade SAH patients undergoing multimodality intracranial neuromonitoring...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28386920/insular-epilepsy-surgery
#9
Pramote Laoprasert, Jeffrey G Ojemann, Michael H Handler
Since it was originally described nearly 70 years ago, insular epilepsy has been increasingly recognized and may explain failures after apparently well-planned operations. We review the history of awareness of the phenomenon, techniques for its assessment, and its surgical management. Insular epilepsy can mimic features of frontal, parietal, or temporal seizures. It should be considered when a combination of somatosensory, visceral, and motor symptoms is observed early in a seizure. Extraoperative intracranial recordings are required to accurately diagnose insular seizures...
April 2017: Epilepsia
https://www.readbyqxmd.com/read/28384472/theta-oscillations-rapidly-convey-odor-specific-content-in-human-piriform-cortex
#10
Heidi Jiang, Stephan Schuele, Joshua Rosenow, Christina Zelano, Josef Parvizi, James X Tao, Shasha Wu, Jay A Gottfried
Olfactory oscillations are pervasive throughout vertebrate and invertebrate nervous systems. Such observations have long implied that rhythmic activity patterns play a fundamental role in odor coding. Using intracranial EEG recordings from rare patients with medically resistant epilepsy, we find that theta oscillations are a distinct electrophysiological signature of olfactory processing in the human brain. Across seven patients, odor stimulation enhanced theta power in human piriform cortex, with robust effects at the level of single trials...
April 5, 2017: Neuron
https://www.readbyqxmd.com/read/28373797/refractory-lesional-parietal-lobe-epilepsy-clinical-electroencephalographic-and-neurodiagnostic-findings
#11
Oğuzhan Kurşun, Hülya Karataş, Neşe Dericioğlu, Serap Saygi
INTRODUCTION: Specialized centers, in the management and surgical treatment of medically refractory epilepsy, emphasize the importance of differentiating the varieties of localization related epilepsies. There has been considerable recent interest in temporal and frontal lobe epileptic syndromes and less attention has been paid to parietal and occipital lobe epilepsies. METHODS: Here we report the clinical, electroencephalographic and neuroimaging characteristics of 46 patients with medically refractory lesional parietal lobe epilepsy who have been followed up for 1-10 years...
September 2016: Noro Psikiyatri Arsivi
https://www.readbyqxmd.com/read/28337411/physiological-and-pathological-high-frequency-oscillations-have-distinct-sleep-homeostatic-properties
#12
Nicolás von Ellenrieder, François Dubeau, Jean Gotman, Birgit Frauscher
OBJECTIVE: The stage of sleep is a known modulator of high-frequency oscillations (HFOs). For instance, high amplitude slow waves during NREM sleep and the subtypes of REM sleep were shown to contribute to a better separation between physiological and pathological HFOs. This study investigated rates and spatial spread of the different HFO types (physiological and pathological ripples in the 80-250 Hz frequency band, and fast ripples above 250 Hz) depending on time spent in sleep across the different sleep cycles...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28328980/early-biomarkers-of-brain-injury-and-cerebral-hypo-and-hyperoxia-in-the-safeboosc-ii-trial
#13
Anne M Plomgaard, Thomas Alderliesten, Topun Austin, Frank van Bel, Manon Benders, Olivier Claris, Eugene Dempsey, Monica Fumagalli, Christian Gluud, Cornelia Hagmann, Simon Hyttel-Sorensen, Petra Lemmers, Wim van Oeveren, Adelina Pellicer, Tue H Petersen, Gerhard Pichler, Per Winkel, Gorm Greisen
BACKGROUND: The randomized clinical trial, SafeBoosC II, examined the effect of monitoring of cerebral oxygenation by near-infrared spectroscopy combined with a guideline on treatment when cerebral oxygenation was out of the target range. Data on cerebral oxygenation was collected in both the intervention and the control group. The primary outcome was the reduction in the burden of cerebral hypo- and hyperoxia between the two groups. In this study we describe the associations between the burden of cerebral hypo- and hyperoxia, regardless of allocation to intervention or control group, and the biomarkers of brain injury from birth till term equivalent age that was collected as secondary and explorative outcomes in the SafeBoosC II trial...
2017: PloS One
https://www.readbyqxmd.com/read/28327467/automated-detection-of-epileptic-ripples-in-meg-using-beamformer-based-virtual-sensors
#14
Carolina Migliorelli, Joan Alonso, Sergio Romero, Rafal Nowak, Antonio Russi, Miguel Mananas
OBJECTIVE: In epilepsy, high-frequency oscillations (HFOs) are considered events highly linked to the seizure onset zone (SOZ). The detection of HFOs in noninvasive signals such as scalp EEG and MEG is still a challenging task. The aim of this study was to automatize the detection of ripples in MEG signals reducing the high-frequency noise using beamformer-based virtual sensors (VS) and applying an automatic procedure exploring the time-frequency content of the detected events. APPROACH: 200 seconds of MEG signals and simultaneous iEEG were selected in nine patients with refractory epilepsy...
March 22, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28324954/hardware-friendly-seizure-detection-with-a-boosted-ensemble-of-shallow-decision-trees
#15
Mahsa Shoaran, Masoud Farivar, Azita Emami
Efficient on-chip learning is becoming an essential element of implantable biomedical devices. Despite a substantial literature on automated seizure detection algorithms, hardware-friendly implementation of such techniques is not sufficiently addressed. In this paper, we propose to employ a gradientboosted ensemble of decision trees to achieve a reasonable trade-off between detection accuracy and implementation cost. Combined with the proposed feature extraction model, we show that these classifiers quickly become competitive with more complex learning models previously proposed for hardware implementation, with only a small number of low-depth (d <; 4) "shallow" trees...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324680/somatic-complications-of-epilepsy-surgery-over-25-years-at-a-single-center
#16
Inuka K Gooneratne, Shahidul Mannan, Jane de Tisi, Juan C Gonzalez, Andrew W McEvoy, Anna Miserocchi, Beate Diehl, Tim Wehner, Gail S Bell, Josemir W Sander, John S Duncan
INTRODUCTION: Epilepsy surgery is an effective treatment for refractory focal epilepsy. Risks of surgery need to be considered when advising individuals of treatment options. We describe the frequency and nature of physical adverse events associated with epilepsy surgery in a single center. MATERIAL AND METHODS: We reviewed the prospectively maintained records of adults who underwent epilepsy surgery at our center between 1990 and 2014 to identify peri/postsurgical adverse events...
March 1, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28322026/objective-3d-surface-evaluation-of-intracranial-electrophysiologic-correlates-of-cerebral-glucose-metabolic-abnormalities-in-children-with-focal-epilepsy
#17
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/28318128/proton-mr-spectroscopy-in-patients-with-nonlesional-insular-cortex-epilepsy-confirmed-by-invasive-eeg-recordings
#18
Yasmine Aitouche, Steve A Gibbs, Guillaume Gilbert, Olivier Boucher, Alain Bouthillier, Dang Khoa Nguyen
BACKGROUND AND PURPOSE: Recent studies suggest that a nonnegligible proportion of drug-resistant epilepsy surgery candidates have an epileptogenic zone that involves the insula. We aimed to examine the value of proton magnetic resonance spectroscopy ((1) H-MRS) in identifying patients with insular cortex epilepsy. METHODS: Patients with possible nonlesional drug-refractory insular epilepsy underwent a voxel-based (1) H-MRS study prior to an intracranial electroencephalographic (EEG) study...
March 20, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28303098/ielectrodes-a-comprehensive-open-source-toolbox-for-depth-and-subdural-grid-electrode-localization
#19
Alejandro O Blenkmann, Holly N Phillips, Juan P Princich, James B Rowe, Tristan A Bekinschtein, Carlos H Muravchik, Silvia Kochen
The localization of intracranial electrodes is a fundamental step in the analysis of invasive electroencephalography (EEG) recordings in research and clinical practice. The conclusions reached from the analysis of these recordings rely on the accuracy of electrode localization in relationship to brain anatomy. However, currently available techniques for localizing electrodes from magnetic resonance (MR) and/or computerized tomography (CT) images are time consuming and/or limited to particular electrode types or shapes...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28294306/the-hemodynamic-response-to-interictal-epileptic-discharges-localizes-the-seizure-onset-zone
#20
Hui Ming Khoo, Yongfu Hao, Nicolás von Ellenrieder, Natalja Zazubovits, Jeffery Hall, André Olivier, François Dubeau, Jean Gotman
OBJECTIVE: Intracranial electroencephalography (EEG), performed presurgically in patients with drug-resistant and difficult-to-localize focal epilepsy, samples only a small fraction of brain tissue and thus requires strong hypotheses regarding the possible localization of the epileptogenic zone. EEG/fMRI (functional magnetic resonance imaging), a noninvasive tool resulting in hemodynamic responses, could contribute to the generation of these hypotheses. This study assessed how these responses, despite their interictal origin, predict the seizure-onset zone (SOZ)...
March 15, 2017: Epilepsia
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