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Intracranial EEG

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https://www.readbyqxmd.com/read/29753683/evaluating-resective-surgery-targets-in-epilepsy-patients-a-comparison-of-quantitative-eeg-methods
#1
Michael Müller, Kaspar Schindler, Marc Goodfellow, Claudio Pollo, Christian Rummel, Andreas Steimer
BACKGROUND: Quantitative analysis of intracranial EEG is a promising tool to assist clinicians in the planning of resective brain surgery in patients suffering from pharmacoresistant epilepsies. Quantifying the accuracy of such tools, however, is nontrivial as a ground truth to verify predictions about hypothetical resections is missing. NEW METHOD: As one possibility to address this, we use customized hypotheses tests to examine the agreement of the methods on a common set of patients...
May 10, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29751364/ictal-and-interictal-electric-source-imaging-in-presurgical-evaluation-a-prospective-study
#2
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/29740121/magnetic-resonance-imaging-provides-evidence-of-glymphatic-drainage-from-human-brain-to-cervical-lymph-nodes
#3
Per Kristian Eide, Svein Are Sirirud Vatnehol, Kyrre Eeg Emblem, Geir Ringstad
Pre-clinical research in rodents provides evidence that the central nervous system (CNS) has functional lymphatic vessels. In-vivo observations in humans, however, are not demonstrated. We here show data on CNS lymphatic drainage to cervical lymph nodes in-vivo by magnetic resonance imaging (MRI) enhanced with an intrathecal contrast agent as a cerebrospinal fluid (CSF) tracer. Standardized MRI of the intracranial compartment and the neck were acquired before and up to 24-48 hours following intrathecal contrast agent administration in 19 individuals...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29729534/the-surgical-outcome-of-patients-with-bilateral-temporal-lobe-epilepsy
#4
Xiaoxia Zhou, Tao Yu, Guojun Zhang, Duanyu Ni, Liang Qiao, Xueyuan Wang, Cuiping Xu, Chang Liu, Yuping Wang, Yongjie Li
OBJECTIVES: The purpose of this study is to explore the surgical outcome of unilateral anterior temporal lobectomy (ATL) for patients with bilateral temporal lobe epilepsy (BTLE). METHODS: We retrospectively reviewed the data of patients who were diagnosed with BTLE by scalp electroencephalogram (EEG) and underwent ATL from 2001 to 2015. In addition, 80 patients were randomly selected as a control group. RESULTS: One hundred seventeen patients were included in this study and were divided into four groups by intracranial recordings as follows: 78 patients with unilateral seizure onset (Group 1), 13 patients with lateralizable dominant seizure onset (Group 2), 14 patients with lateralizable neuroimaging abnormalities (Group 3), and 12 patients without lateralizable dominant seizure onset or neuroimaging abnormalities (Group 4)...
April 26, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29710763/integration-of-24-feature-types-to-accurately-detect-and-predict-seizures-using-scalp-eeg-signals
#5
Yinda Zhang, Shuhan Yang, Yang Liu, Yexian Zhang, Bingfeng Han, Fengfeng Zhou
The neurological disorder epilepsy causes substantial problems to the patients with uncontrolled seizures or even sudden deaths. Accurate detection and prediction of epileptic seizures will significantly improve the life quality of epileptic patients. Various feature extraction algorithms were proposed to describe the EEG signals in frequency or time domains. Both invasive intracranial and non-invasive scalp EEG signals have been screened for the epileptic seizure patterns. This study extracted a comprehensive list of 24 feature types from the scalp EEG signals and found 170 out of the 2794 features for an accurate classification of epileptic seizures...
April 28, 2018: Sensors
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
#6
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/29692963/anterior-corpus-callosotomy-in-patients-with-drug-resistant-epilepsy-invasive-eeg-findings-and-seizure-outcomes
#7
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/29683966/intracranial-space-occupying-lesion-inducing-intracranial-hypertension-increases-the-encephalographic-effects-of-isoflurane-in-a-swine-model
#8
Tadayoshi Kurita, Shingo Kawashima, Koji Morita, Yoshiki Nakajima
BACKGROUND: Patients with a brain tumor are susceptible to the hypnotic effect of anesthetics depending on the tumor's size. We investigated whether intracranial space-occupying lesions (ICSOLs) inducing intracranial hypertension increase isoflurane's effect on electroencephalographic (EEG) results. MATERIALS AND METHODS: After anesthetic induction with isoflurane, 11 swine were studied with regard to isoflurane's effect on EEGs at 0.5% to 2.0% inhalational concentration at sequential stages: baseline 1, ICSOL 1, baseline 2, ICSOL 2, baseline 3...
April 20, 2018: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/29666262/spatial-and-temporal-heterogeneity-of-neural-responses-in-human-posteromedial-cortex
#9
Amy L Daitch, Josef Parvizi
Neuroimaging evidence supports a role of the default mode network (DMN) in spontaneous thought and goal-driven internally oriented processes, such as recalling an autobiographical event, and has demonstrated its deactivation during focused, externally oriented attention. Recent work suggests that the DMN is not a homogeneous network but rather is composed of at least several subnetworks, which are engaged in distinct functions; however, it is still unclear if these different functions rely on the same neuronal populations...
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29662089/time-rescaling-reproduces-eeg-behavior-during-transition-from-propofol-anesthesia-induced-unconsciousness-to-consciousness
#10
S Boussen, A Spiegler, C Benar, M Carrère, F Bartolomei, P Metellus, R Voituriez, L Velly, N Bruder, A Trébuchon
General anesthesia (GA) is a reversible manipulation of consciousness whose mechanism is mysterious at the level of neural networks leaving space for several competing hypotheses. We recorded electrocorticography (ECoG) signals in patients who underwent intracranial monitoring during awake surgery for the treatment of cerebral tumors in functional areas of the brain. Therefore, we recorded the transition from unconsciousness to consciousness directly on the brain surface. Using frequency resolved interferometry; we studied the intermediate ECoG frequencies (4-40 Hz)...
April 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29649770/advanced-dynamic-statistical-parametric-mapping-with-meg-in-localizing-epileptogenicity-of-the-bottom-of-sulcus-dysplasia
#11
Midori Nakajima, Simeon Wong, Elysa Widjaja, Shiro Baba, Tohru Okanishi, Lynne Takada, Yosuke Sato, Hiroki Iwata, Maya Sogabe, Hikaru Morooka, Robyn Whitney, Yuki Ueda, Tomoshiro Ito, Kazuyori Yagyu, Ayako Ochi, O Carter Snead, James T Rutka, James M Drake, Sam Doesburg, Fumiya Takeuchi, Hideaki Shiraishi, Hiroshi Otsubo
OBJECTIVE: To investigate whether advanced dynamic statistical parametric mapping (AdSPM) using magnetoencephalography (MEG) can better localize focal cortical dysplasia at bottom of sulcus (FCDB). METHODS: We analyzed 15 children with diagnosis of FCDB in surgical specimen and 3 T MRI by using MEG. Using AdSPM, we analyzed a ±50 ms epoch relative to each single moving dipole (SMD) and applied summation technique to estimate the source activity. The most active area in AdSPM was defined as the location of AdSPM spike source...
March 30, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29643629/intraoperative-neurophysiological-monitoring-team-s-communiqu%C3%A3-with-anesthesia-professionals
#12
Anurag Tewari, Lisa Francis, Ravi N Samy, Dean C Kurth, Joshua Castle, Tiffany Frye, Mohamed Mahmoud
Background and Aims: Intraoperative neurophysiological monitoring (IONM) is the standard of care during many spinal, vascular, and intracranial surgeries. High-quality perioperative care requires the communication and cooperation of several multidisciplinary teams. One of these multidisciplinary services is intraoperative neuromonitoring (IONM), while other teams represent anesthesia and surgery. Few studies have investigated the IONM team's objective communication with anesthesia providers...
January 2018: Journal of Anaesthesiology, Clinical Pharmacology
https://www.readbyqxmd.com/read/29628910/the-sub-regional-functional-organization-of-neocortical-irritative-epileptic-networks-in-pediatric-epilepsy
#13
Radek Janca, Pavel Krsek, Petr Jezdik, Roman Cmejla, Martin Tomasek, Vladimir Komarek, Petr Marusic, Premysl Jiruska
Between seizures, irritative network generates frequent brief synchronous activity, which manifests on the EEG as interictal epileptiform discharges (IEDs). Recent insights into the mechanism of IEDs at the microscopic level have demonstrated a high variance in the recruitment of neuronal populations generating IEDs and a high variability in the trajectories through which IEDs propagate across the brain. These phenomena represent one of the major constraints for precise characterization of network organization and for the utilization of IEDs during presurgical evaluations...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29620012/rapid-antiepileptic-drug-withdrawal-may-obscure-localizing-information-obtained-during-presurgical-eeg-recordings
#14
Yulia Novitskaya, Mandy Hitz, Andreas Schulze-Bonhage
Withdrawal of antiepileptic drugs (AEDs) is a standard procedure during presurgical epilepsy assessment. Rapid and, at times, even pre-hospital withdrawal of medication is performed in some centres to enhance the yield of recorded seizures during video-EEG monitoring. AED withdrawal, however, affects the propensity and speed of propagation of epileptic activity, may evoke more severe seizures, and may cause pitfalls in EEG interpretation. We report a case which had been recommended to undergo intracranial EEG recordings in order to clarify apparently discordant MRI findings and ictal EEG patterns when monitoring was performed following complete AED withdrawal...
April 5, 2018: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/29620007/ictal-spitting-in-non-dominant-temporal-lobe-epilepsy-an-anatomo-electrophysiological-correlation
#15
Marcos Quevedo-Diaz, Adrià Tauste Campo, Manel Vila-Vidal, Alessandro Principe, Miguel Ley, Rodrigo Rocamora
We report a patient presenting drug-resistant, non-dominant temporal lobe epilepsy with ictal spitting and prosopometamorphopsia, both extremely rare semiologies. Second-phase pre-surgical monitoring was performed using SEEG due to lesion-negative imaging and the rare semiology. The seizure onset zone was delimited to the right anterior hippocampus and the temporobasal cortex, with the propagation zone within the entorhinal cortex. Interestingly, direct electrical stimulation to the entorhinal cortex, which was reproduced in a number of trials, evoked spitting without leading to seizures or post-discharges...
April 5, 2018: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/29589330/the-use-of-continuous-eeg-monitoring-in-intensive-care-units-in-the-netherlands-a-national-survey
#16
Danny M W Hilkman, Walther N K A van Mook, Werner H Mess, Vivianne H J M van Kranen-Mastenbroek
BACKGROUND: Currently, continuous electroencephalographic monitoring (cEEG) is the only available diagnostic tool for continuous monitoring of brain function in intensive care unit (ICU) patients. Yet, the exact relevance of routinely applied ICU cEEG remains unclear, and information on the implementation of cEEG, especially in Europe, is scarce. This study explores current practices of cEEG in adult Dutch ICU departments focusing on organizational and operational factors, development over time and factors perceived relevant for abstaining its use...
March 27, 2018: Neurocritical Care
https://www.readbyqxmd.com/read/29588994/-saved-by-the-bell-near-sudep-during-intracranial-eeg-monitoring
#17
Duaa M Ba-Armah, Elizabeth J Donner, Ayako Ochi, Cristina Go, Bláthnaid McCoy, Carter Snead, James Drake, Kevin C Jones
SUDEP is the sudden unexpected death of a person with epilepsy, when no structural or toxicological cause of death can be found. The majority of witnessed cases are reported to be preceded by a convulsive seizure and postictal hypoventilation. Here, we report an 8-year-old girl with drug-resistant focal seizures secondary to a focal cortical dysplasia type IIb. While undergoing invasive intracranial monitoring with subdural and depth electrodes, she had a clinical apnea event recorded on video, followed by bradycardia, which required resuscitation...
March 2018: Epilepsia open
https://www.readbyqxmd.com/read/29588964/application-of-rns-in-refractory-epilepsy-targeting-insula
#18
Hai Chen, Patricia Dugan, Derek J Chong, Anli Liu, Werner Doyle, Daniel Friedman
Although responsive neurostimulation (RNS) is approved for treatment of resistant focal epilepsy in adults, little is known about response to treatment of specific cortical targets. We describe the experience of RNS targeting the insular lobe. We identified patients who had RNS implantation with at least one electrode within the insula between April 2014 and October 2015. We performed a retrospective review of preoperative clinical features, imaging, electrocardiogram (EEG), intraoperative electrocorticography (ECoG), and postoperative seizure outcome...
September 2017: Epilepsia Open
https://www.readbyqxmd.com/read/29588956/high-frequency-oscillations-detected-in-ecog-recordings-correlate-with-cavernous-malformation-and-seizure-free-outcome-in-a-child-with-focal-epilepsy-a-case-report
#19
Su Liu, Michael M Quach, Daniel J Curry, Monika Ummat, Elaine Seto, Nuri F Ince
Epilepsy associated with cavernous malformation (CM) often requires surgical resection of seizure focus to achieve seizure-free outcome. High-frequency oscillations (HFOs) in intracranial electroencephalogram (EEG) are reported as potential biomarkers of epileptogenic regions, but to our knowledge there are no data on the existence of HFOs in CM-caused epilepsy. Here we report our experience of the identification of the seizure focus in a 3-year-old pediatric patient with intractable epilepsy associated with CM...
June 2017: Epilepsia Open
https://www.readbyqxmd.com/read/29577781/kurtosis-based-detection-of-intracranial-high-frequency-oscillations-for-the-identification-of-the-seizure-onset-zone
#20
Lucia Rita Quitadamo, Roberto Mai, Francesca Gozzo, Veronica Pelliccia, Francesco Cardinale, Stefano Seri
Pathological High-Frequency Oscillations (HFOs) have been recently proposed as potential biomarker of the seizure onset zone (SOZ) and have shown superior accuracy to interictal epileptiform discharges in delineating its anatomical boundaries. Characterization of HFOs is still in its infancy and this is reflected in the heterogeneity of analysis and reporting methods across studies and in clinical practice. The clinical approach to HFOs identification and quantification usually still relies on visual inspection of EEG data...
January 15, 2018: International Journal of Neural Systems
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