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Continuous eeg

Rodrigo Vargas, Lucas Beltrán, Rafael Lizama, Gabriela Reyes Valenzuela, Roberto Caraballo
PURPOSE: To present a retrospective study of 13 children with benign epilepsy with centrotemporal spikes (BECTS), also known as benign rolandic epilepsy (BRE), associated with generalized spikes and waves as the only EEG manifestation at onset. METHOD: Charts of children with typical clinical criteria of BRE electroclinically followed-up between February 2000 and February 2015 were reviewed. RESULTS: Among 309 patients who met the electroclinical criteria of BRE, we identified 13 children who presented with the typical clinical manifestations but who, on the EEG, only had generalized paroxysms at onset that continued along the course of the syndrome...
March 9, 2018: Seizure: the Journal of the British Epilepsy Association
Sujith S Pereira, Stephen T Kempley, David F Wertheim, Ajay K Sinha, Joan K Morris, Divyen K Shah
Background: Cerebral electrical activity in extremely preterm infants is affected by various factors including blood gas and circulatory parameters. Objective: To investigate whether continuously measured invasive mean arterial blood pressure (BP) is associated with electroencephalographic (EEG) discontinuity in extremely preterm infants. Study design: This prospective observational study examined 51 newborn infants born <29 weeks gestation in the first 3 days after birth...
2018: Frontiers in Neurology
Andrea O Rossetti, Kaspar Schindler, Vincent Alvarez, Raoul Sutter, Jan Novy, Mauro Oddo, Loane Warpelin-Decrausaz, Stephan Rüegg
Continuous video-EEG is recommended for patients with altered consciousness; as compared to routine EEG (lasting <30 minutes), it improves seizure detection, but is time- and resource-consuming. Although North American centers increasingly implement continuous video-EEG, most other (including European) hospitals have insufficient resources. Only one study suggested that continuous video-EEG could improve outcome in adults, and a recent assessments challenge this view. This article reviews current evidence on the added value for continuous video-EEG in clinical terms and describes a design for a prospective study...
March 8, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
Wolfgang Muhlhofer, Jerzy P Szaflarski
PURPOSE OF REVIEW: This paper aims to review and summarize the key contributions of EEG to prognostication after cardiac arrest (CA). RECENT FINDINGS: While there are more EEG patterns predicting poor than good outcome, even EEG patterns previously considered to be "very malignant" may result in survival with a meaningful neurological outcome depending on their underlying etiology as well as the continuity and reactivity of the EEG background. Regardless of the potentially confounding factors, EEG patterns are highly specific with a relatively low false-positive rate...
March 10, 2018: Current Neurology and Neuroscience Reports
Heather Campbell, Rathinaswamy B Govindan, Srinivas Kota, Tareq Al-Shargabi, Marina Metzler, Nickie Andescavage, Taeun Chang, Gilbert Vezina, Adre du Plessis, An N Massaro
OBJECTIVE: To evaluate whether infants with hypoxic-ischemic encephalopathy and evidence of autonomic dysfunction have aberrant physiological responses to care events that could contribute to evolving brain injury. STUDY DESIGN: Continuous tracings of heart rate (HR), blood pressure (BP), cerebral near infrared spectroscopy, and video electroencephalogram data were recorded from newborn infants with hypoxic-ischemic encephalopathy who were treated with hypothermia...
March 6, 2018: Journal of Pediatrics
A M Ardi Handojoseno, Ganesh R Naik, Moran Gilat, James M Shine, Tuan N Nguyen, Quynh T Ly, Simon J G Lewis, Hung T Nguyen
Freezing of gait (FOG) is an episodic gait disturbance affecting initiation and continuation of locomotion in many Parkinson's disease (PD) patients, causing falls and a poor quality of life. FOG can be experienced on turning and start hesitation, passing through doorways or crowded areas dual tasking, and in stressful situations. Electroencephalography (EEG) offers an innovative technique that may be able to effectively foresee an impending FOG. From data of 16 PD patients, using directed transfer function (DTF) and independent component analysis (ICA) as data pre-processing, and an optimal Bayesian neural network as a predictor of a transition of 5 seconds before the impending FOG occurs in 11 in-group PD patients, we achieved sensitivity and specificity of 85...
2018: Studies in Health Technology and Informatics
Tobias Vogt, Kouki Kato, Nils Flüthmann, Oliver Bloch, Hiroki Nakata, Kazuyuki Kanosue
OBJECTIVE: Motor-related cortical potentials (MRCP) often compared separated muscle activations; however, MRCP preceding combined contraction onsets and relaxation offsets of one consecutive motor task sequence remain to be elucidated. METHODS: Twelve healthy males (27.92±4.33 years, 181.83±7.15 cm, 84.58±7.15 kg) performed 40 submaximal isometric right-limb wrist flexions (i.e. motor task sequences). Each motor task sequence combined timed contractions to and relaxations from distinct torque levels, i...
March 1, 2018: Journal of Musculoskeletal & Neuronal Interactions
Sudhir Datar
Status epilepticus (SE) is a medical emergency and presents with either a continuous prolonged seizure or multiple seizures without full recovery of consciousness in between them. The goals of treatment are prompt recognition, early seizure termination, and simultaneous evaluation for any potentially treatable cause. Improved understanding of the pathophysiology has led to a more practical definition. New data have emerged regarding the safety and efficacy of alternative agents, which are increasingly used in the management of these patients...
April 2018: Neurosurgery Clinics of North America
Emily L Dennis, Talin Babikian, Christopher C Giza, Paul M Thompson, Robert F Asarnow
Traumatic brain injury (TBI) is a significant public health problem in the United States, especially for children and adolescents. Current epidemiological data estimate over 600,000 patients younger than 20 years are treated for TBI in emergency rooms annually. While many patients experience a full recovery, for others there can be long-lasting cognitive, neurological, psychological, and behavioral disruptions. TBI in youth can disrupt ongoing brain development and create added family stress during a formative period...
February 1, 2018: Neuroscientist: a Review Journal Bringing Neurobiology, Neurology and Psychiatry
Soheila Samiee, Maxime Lévesque, Massimo Avoli, Sylvain Baillet
Polyrhythmic coupling of oscillatory components in electrophysiological signals results from the interactions between neuronal sub-populations within and between cell assemblies. Since the mechanisms underlying epileptic disorders should affect such interactions, abnormal level of cross-frequency coupling is expected to provide a signal marker of epileptogenesis. We measured phase-amplitude coupling (PAC), a form of cross-frequency coupling between neural oscillations, in a rodent model of mesial temporal lobe epilepsy...
February 24, 2018: Neurobiology of Disease
Baxter B Allen, Peter B Forgacs, Malik A Fakhar, Xian Wu, Linda M Gerber, Srikanth Boddu, Santosh B Murthy, Philip E Stieg, Halinder S Mangat
BACKGROUND: Data on new-onset seizures after treatment of aneurysmal subarachnoid hemorrhage (aSAH) patients are limited and variable. We examined the association between new-onset seizures after aSAH and aneurysm treatment modality, as well their relationship with initial clinical severity of aSAH and outcomes. METHODS: This is a retrospective cohort study of all aSAH patients admitted to our institution over a 6-year period. 'Seizures' were defined as any observed clinical seizure or electrographic seizure on continuous electroencephalogram (cEEG) recordings, as determined by the reviewing neurophysiologist...
February 26, 2018: Neurocritical Care
Somayeh B Shafiei, Ahmed Aly Hussein, Sarah Feldt Muldoon, Khurshid A Guru
Mutual trust is important in surgical teams, especially in robot-assisted surgery (RAS) where interaction with robot-assisted interface increases the complexity of relationships within the surgical team. However, evaluation of trust between surgeons is challenging and generally based on subjective measures. Mentor-Trainee trust was defined as assessment of mentor on trainee's performance quality and approving trainee's ability to continue performing the surgery. Here, we proposed a novel method of objectively assessing mentor-trainee trust during RAS based on patterns of brain activity of surgical mentor observing trainees...
February 26, 2018: Scientific Reports
Jose L Contreras-Vidal, Magdo Bortole, Fangshi Zhu, Kevin Nathan, Anusha Venkatakrishnan, Gerard E Francisco, Rogelio Soto, Jose L Pons
OBJECTIVE: Advancements in robot-assisted gait rehabilitation and brain-machine interfaces (BMI) may enhance stroke physiotherapy by engaging patients while providing information about robot-induced cortical adaptations. We investigate the feasibility of decoding walking from brain activity in stroke survivors during therapy using a powered exoskeleton integrated with an electroencephalography (EEG)-based BMI. DESIGN: The H2 powered exoskeleton was designed for overground gait training with actuated hip, knee and ankle joints...
February 23, 2018: American Journal of Physical Medicine & Rehabilitation
Michael P Broderick, Andrew J Anderson, Giovanni M Di Liberto, Michael J Crosse, Edmund C Lalor
People routinely hear and understand speech at rates of 120-200 words per minute [1, 2]. Thus, speech comprehension must involve rapid, online neural mechanisms that process words' meanings in an approximately time-locked fashion. However, electrophysiological evidence for such time-locked processing has been lacking for continuous speech. Although valuable insights into semantic processing have been provided by the "N400 component" of the event-related potential [3-6], this literature has been dominated by paradigms using incongruous words within specially constructed sentences, with less emphasis on natural, narrative speech comprehension...
February 21, 2018: Current Biology: CB
Marlene Derner, Amirhossein Jahanbekam, Christian Bauckhage, Nikolai Axmacher, Juergen Fell
Absolute (i.e. measured) rhinal and hippocampal phase values are predictive for memory formation. It has been an open question, whether the capability of mediotemporal structures to react to stimulus presentation with phase shifts may be similarly indicative of successful memory formation. We analyzed data from 27 epilepsy patients implanted with depth electrodes in the hippocampus and entorhinal cortex, who performed a continuous word recognition task. Electroencephalographic (EEG) phase information related to the first presentation of repeatedly presented words was used for prediction of subsequent remembering versus forgetting applying a support vector machine...
February 23, 2018: European Journal of Neuroscience
Brandy B Ma, Emily L Johnson, Eva K Ritzl
INTRODUCTION: Neurocritical care units commonly implement the double-distance reduced EEG montage in postoperative neurosurgic patients who have structural barriers that hinder the placement of a standard 10-20 system array. Despite its widespread use, its sensitivity has not been adequately addressed. We evaluated the sensitivity and specificity of this montage for seizure detection. METHODS: One hundred fifty-five full-montage continuous EEGs (cEEGs) completed in the Johns Hopkins University neurocritical care unit containing unequivocal electrographic seizures, status epilepticus, or other abnormalities were selected, comprising 73 ictal and 82 nonictal EEGs...
February 21, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
Rodolfo Abreu, Alberto Leal, Patrícia Figueiredo
The simultaneous acquisition of electroencephalography (EEG) with functional magnetic resonance imaging (fMRI) is a very promising non-invasive technique for the study of human brain function. Despite continuous improvements, it remains a challenging technique, and a standard methodology for data analysis is yet to be established. Here we review the methodologies that are currently available to address the challenges at each step of the data analysis pipeline. We start by surveying methods for pre-processing both EEG and fMRI data...
2018: Frontiers in Human Neuroscience
Nathan J Stevenson, Sampsa Vanhatalo
Neonatal seizures are widely considered a neurological emergency with a need for prompt treatment, yet they are known to present a highly elusive target for bedside clinicians. Recent studies have suggested that the design of a neonatal seizure treatment trial will profoundly influence the sample size, which may readily increase to hundreds or even thousands as the achieved effect size diminishes to clinical irrelevance. The self-limiting and rapidly resolving nature of neonatal seizures diminishes the measurable treatment effect every hour after seizure onset and any effect may potentially be confused with spontaneous resolution, precluding the value of many observational studies...
February 12, 2018: Seminars in Fetal & Neonatal Medicine
Stephanie Cook, Katerina Kokmotou, Vicente Soto, Hazel Wright, Nicholas Fallon, Anna Thomas, Timo Giesbrecht, Matt Field, Andrej Stancak
Odours alter evaluations of concurrently presented visual stimuli, such as faces. Stimulus onset asynchrony (SOA) is known to affect evaluative priming in various sensory modalities. However, effects of SOA on odour priming of visual stimuli are not known. The present study aimed to analyse whether subjective and cortical activation changes during odour priming would vary as a function of SOA between odours and faces. Twenty-eight participants rated faces under pleasant, unpleasant, and no-odour conditions using visual analogue scales...
February 18, 2018: Neuroscience Letters
Ildikó Nagy, Dániel Fabó
Neurophysiological methods are gaining ground in the diagnosis and therapy of cerebrovascular disease. While the role of the EEG (electroencephalography) in the diagnosis of post-stroke epilepsy is constant, quantitative EEG para-meters, as new indicators of early efficiency after thrombolysis or in prognosis of patient's condition have proved their effectiveness in several clinical studies. In intensive care units, continuous EEG monitoring of critically ill patients became part of neurointenzive care protocols...
January 30, 2018: Ideggyógyászati Szemle
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