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EEG stroke

Brin Freund, James J Gugger, Alexandra Reynolds, William O Tatum, Jan Claassen, Peter W Kaplan
PURPOSE: Periodic discharges (PDs) are EEG patterns denoting brain dysfunction and ictal tendency. Their exact meaning regarding etiology and outcomes is not well known. In particular, bilateral independent PDs (BIPDs) are poorly described. METHODS: We performed a retrospective, multicenter study evaluating neuroimaging, epileptic, clinical, and EEG correlates of BIPDs. RESULTS: Twenty-five patients studied with a mean Glasgow Coma Scale 6...
March 15, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
Xin Zhao, Jinyu Liu, Shijun Yang, Dandan Song, Chen Wang, Chen Chen, Xiaoya Li, Qiuting Wang, Shasha Ge, Runmei Yang, Xiuhua Liu, Yulin Lin, Dayong Cai
ETHNOPHARMACOLOGICAL RELEVANCE: Vascular dementia (VaD) is the common cognitive disorder derived mainly from lacunar stroke (LS). The oxidative stress induced neurovascular coupling (NVC) dysfunction involves in the pathogenesis of VaD. Currently, there is no specific drug for VaD. Ling-Yang-Gou-Teng -Decoction (LG), a well-known traditional Chinese formula, has been used for preventing VaD in clinic. AIM OF THE STUDY: In this study, we aimed to investigate the underlying mechanism of LG on VaD in rats...
March 12, 2018: Journal of Ethnopharmacology
Chunfang Wang, Yuanyuan Chen, Changcheng Sun, Ying Zhang, Dong Ming, Jingang Du
BACKGROUND: We aimed to explore the electrophysiological changes in poststroke subjects with depressed mood. METHODS: Resting-state electroencephalogram (EEG) signals of 16 electrodes in 35 poststroke depressed, 24 poststroke nondepressed, and 35 age-matched healthy control subjects were analyzed by means of spectral power analysis, a quantitative EEG measurement of different frequency bands. The relationship among depressed mood, functional status, lesion side, and poststroke time was assessed by using variance and Spearman correlation analysis...
March 13, 2018: International Journal of Geriatric Psychiatry
Xiaokang Shu, Shugeng Chen, Lin Yao, Xinjun Sheng, Dingguo Zhang, Ning Jiang, Jie Jia, Xiangyang Zhu
Motor imagery (MI) based brain-computer interface (BCI) has been developed as an alternative therapy for stroke rehabilitation. However, experimental evidence demonstrates that a significant portion (10-50%) of subjects are BCI-inefficient users (accuracy less than 70%). Thus, predicting BCI performance prior to clinical BCI usage would facilitate the selection of suitable end-users and improve the efficiency of stroke rehabilitation. In the current study, we proposed two physiological variables, i.e., laterality index (LI) and cortical activation strength (CAS), to predict MI-BCI performance...
2018: Frontiers in Neuroscience
Ruud C Van Kaam, Michel J A M van Putten, Sarah E Vermeer, Jeannette Hofmeijer
BACKGROUND: The noninjured, contralateral hemisphere is increasingly acknowledged in the process of recovery from acute ischemic stroke. We estimated the value of conventional electroencephalography (EEG) recordings for identifying contralateral hemisphere involvement in relation to functional recovery. METHODS: We analyzed 2-min epochs from 21 electrode EEG registrations of 18 patients with acute hemispheric ischemic stroke and compared with 18 age-matched controls...
March 6, 2018: Cerebrovascular Diseases
Guo-Shuai Yang, Xiao-Yan Zhou, Xue-Fang An, Xuan-Jun Liu, Yan-Jun Zhang, Dan Yu
Stroke is considered an underlying etiology of the development of seizures. Stroke leads to glucose and oxygen deficiency in neurons, resulting in brain dysfunction and injury. Mild hypothermia is a therapeutic strategy to inhibit stroke‑induced seizures, which may be associated with the regulation of energy metabolism of the brain. Mammalian target of rapamycin (mTOR) signaling and solute carrier family 2, facilitated glucose transporter member (GLUT)‑1 are critical for energy metabolism. Furthermore, mTOR overactivation and GLUT‑1 deficiency are associated with genetically acquired seizures...
February 22, 2018: Molecular Medicine 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
Ioulietta Lazarou, Spiros Nikolopoulos, Panagiotis C Petrantonakis, Ioannis Kompatsiaris, Magda Tsolaki
People with severe neurological impairments face many challenges in sensorimotor functions and communication with the environment; therefore they have increased demand for advanced, adaptive and personalized rehabilitation. During the last several decades, numerous studies have developed brain-computer interfaces (BCIs) with the goals ranging from providing means of communication to functional rehabilitation. Here we review the research on non-invasive, electroencephalography (EEG)-based BCI systems for communication and rehabilitation...
2018: Frontiers in Human Neuroscience
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
Lisbeth Hoejkjaer Larsen, Ivan Chrilles Zibrandtsen, Troels Wienecke, Troels Wesenberg Kjaer, Henning Langberg, Jens Bo Nielsen, Mark Schram Christensen
The functional relevance of cortical reorganisation post-stroke is still not well understood. In this study we investigated task-specific modulation of cortical connectivity between neural oscillations in key motor regions during the early phase after stroke. EEG and EMG recordings were examined from 15 patients and 18 controls during a precision grip task using the affected hand. Each patient attended two sessions in the acute and subacute phase (median of 3 & 34 days) post-stroke. Dynamic causal modeling (DCM) for induced responses was used to investigate task-specific modulations of oscillatory couplings in a bilateral network comprising supplementary motor area (SMA), dorsal premotor cortex (PMd) and primary motor cortex (M1)...
February 21, 2018: European Journal of Neuroscience
Eduardo López-Larraz, Jaime Ibáñez, Fernando Trincado-Alonso, Esther Monge-Pereira, José Luis Pons, Luis Montesano
Motor rehabilitation based on the association of electroencephalographic (EEG) activity and proprioceptive feedback has been demonstrated as a feasible therapy for patients with paralysis. To promote long-lasting motor recovery, these interventions have to be carried out across several weeks or even months. The success of these therapies partly relies on the performance of the system decoding movement intentions, which normally has to be recalibrated to deal with the nonstationarities of the cortical activity...
December 17, 2017: International Journal of Neural Systems
Kevin M Kelly, Peter I Jukkola, Guo Yin, Eric R Miller, Elena A Kharlamov, Deng-Shan Shiau, Roger Strong, Jaroslaw Aronowski
The mechanisms of injured brain that establish poststroke seizures and epilepsy are not well understood, largely because animal modeling has had limited development. The main objective of this study was to determine whether an arterial occlusion model of cortical stroke in young adult and aged rats was capable of generating either focal or generalized epileptic seizures within 2 months of lesioning. Four- and 20-month-old male Fischer 344 (F344) sham-operated controls and those lesioned by transient (3 h) unilateral middle cerebral artery (MCA) and common carotid artery (CCA) occlusion (MCA/CCAo) were studied by video-EEG recordings up to 2 months post-procedure...
February 10, 2018: Epilepsy Research
Mark S Wainwright
PURPOSE OF REVIEW: All critical care is directed at maintaining brain health, but recognizing neurologic complications of critical illness in children is difficult, and limited data exist to guide practice. This article discusses an approach to the recognition and management of seizures, stroke, and cardiac arrest as complications of other critical illnesses in the pediatric intensive care unit. RECENT FINDINGS: Convulsive and nonconvulsive seizures occur frequently in children after cardiac arrest or traumatic brain injury and during extracorporeal membrane oxygenation...
February 2018: Continuum: Lifelong Learning in Neurology
Hannah C Glass
PURPOSE OF REVIEW: Neonatal encephalopathy is the most common condition in neonates encountered by child neurologists. The etiology is most often global hypoxia-ischemia due to failure of cerebral perfusion to the fetus caused by uterine, placental, or umbilical cord compromise prior to or during delivery. Other etiologies of neonatal encephalopathy include ischemic stroke and intracranial hemorrhage, infection, developmental anomalies, and inborn errors of metabolism. RECENT FINDINGS: Therapeutic hypothermia is standard of care for the treatment of neonatal encephalopathy presumed to be caused by hypoxia-ischemia...
February 2018: Continuum: Lifelong Learning in Neurology
Jeannette Hofmeijer, C R van Kaam, Babette van de Werff, Sarah E Vermeer, Marleen C Tjepkema-Cloostermans, Michel J A M van Putten
Introduction: There is strong evidence suggesting detrimental effects of cortical spreading depolarization (CSD) in patients with acute ischemic stroke and severe traumatic brain injury. Previous studies implicated scalp electroencephalography (EEG) features to be correlates of CSD based on retrospective analysis of EEG epochs after having detected "CSD" in time aligned electrocorticography. We studied the feasibility of CSD detection in a prospective cohort study with continuous EEG in 18 patients with acute ischemic stroke and 18 with acute severe traumatic brain injury...
2018: Frontiers in Neurology
Satoshi Shibuya, Satoshi Unenaka, Takuro Zama, Sotaro Shimada, Yukari Ohki
In the rubber hand illusion (RHI), individuals perceive a fake hand as their own when the hidden real hand and visible fake hand are synchronously stroked. Several RHI studies have reported that visual manipulation of the embodied fake hand inversely affects the perceptual processing of the observer's own hand (e.g., thermal or pain sensitivity). In this study, we examined whether motor manipulation of the fake hand similarly affects the observer's motor system. Our study employed a novel RHI paradigm wherein stroking was interrupted by unexpected movement of the fake hand (i...
February 2, 2018: Neuropsychologia
Calixto Machado, Mario Estévez, Rafael Rodriguez-Rojas
Sutton and Clauss presented a detailed review about the effectiveness of zolpidem, discussing recoveries from brain damage due to strokes, trauma and hypoxia. A significant finding has been the unexpected and paradoxical increment of brain activity in vegetative state/unresponsive wakefulness syndrome (VS/UWS). On the contrary, zolpidem is considered one of the best sleep inducers in normal subjects. We have studied series of VS/UWS cases after zolpidem intake. We have demonstrated EEG activation, increment of BOLD signal in different brain regions, and an autonomic influence, mainly characterized by a vagolytic chronotropic effect without a significant increment of the vasomotor sympathetic tone...
2018: Brain Injury: [BI]
Hisham Alshaer, Aditya Pandya, Igor Zivanovic, Carolina Gonzaga Carvalho, Clodagh Ryan
OBJECTIVES: To evaluate if treatment with continuous positive airway pressure (CPAP) compared to usual care in stroke patients with obstructive sleep apnea (OSA) over one month reduces delta and alpha oscillations on quantitative electroencephalography (EEG) in association with improvements in cognitive or functional outcomes. METHODS: Spectral EEG analysis was performed in patients with subacute stroke and OSA randomized to usual care or CPAP treatment from a previous study...
January 9, 2018: Respiratory Physiology & Neurobiology
Yun Kwan Kim, Eunhee Park, Ahee Lee, Chang-Hwan Im, Yun-Hee Kim
BACKGROUND: Recent studies of functional or effective connectivity in the brain have reported that motor-related brain regions were activated during motor execution and motor imagery, but the relationship between motor and cognitive areas has not yet been completely understood. The objectives of our study were to analyze the effective connectivity between motor and cognitive networks in order to define network dynamics during motor execution and motor imagery in healthy individuals. Second, we analyzed the differences in effective connectivity between correct and incorrect responses during motor execution and imagery using dynamic causal modeling (DCM) of electroencephalography (EEG) data...
2018: PloS One
Floriana Pichiorri, Manuela Petti, Stefano Caschera, Laura Astolfi, Febo Cincotti, Donatella Mattia
Brain connectivity has been employed to investigate on post-stroke recovery mechanisms and assess the effect of specific rehabilitation interventions. Changes in interhemispheric coupling after stroke have been related to the extent of damage in the corticospinal tract (CST) and thus, to motor impairment. In this study, we aimed at defining an index of interhemispheric connectivity derived from electroencephalography (EEG), correlated with CST integrity and clinical impairment. Thirty sub-acute stroke patients underwent clinical and neurophysiological evaluation: CST integrity was assessed by Transcranial Magnetic Stimulation and high-density EEG was recorded at rest...
January 2018: European Journal of Neuroscience
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