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Different states of consciousness

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https://www.readbyqxmd.com/read/29772217/altered-activity-and-information-flow-in-the-default-mode-network-of-pilocarpine-induced-epilepsy-rats
#1
Yan Cui, Shuang Yu, Tianjiao Zhang, Yangsong Zhang, Yang Xia, Dezhong Yao, Daqing Guo
Temporal lobe epilepsy (TLE) is considered a brain activity disorder that is likely related to allomnesia and conscious disturbance. In rodents, TLE epileptiform discharges can be triggered by systemic administration of a dose of pilocarpine. However, how these pilocarpine-induced epileptiform discharges generate and propagate through the whole brain has not been well studied. In this study, we sought to assess alterations of activity and information flow in the default mode network (DMN) during TLE epileptiform discharges in pilocarpine-induced TLE rats...
May 14, 2018: Brain Research
https://www.readbyqxmd.com/read/29762103/differentiation-analysis-of-continuous-electroencephalographic-activity-triggered-by-video-clip-contents
#2
Armand Mensen, William Marshall, Shuntaro Sasai, Giulio Tononi
While viewing a video clip, we experience a wide variety of contents, from low-level features of the images to high-level ideas such as the storyline. Each change in our experience must be supported by some corresponding change in neurophysiological activity. Differentiation analysis, which quantifies the differences in brain activity by measuring the distances between observed brain states, was applied here to continuous high-density electroencephalographic data recorded while participants watched short video clips...
May 15, 2018: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29761891/processed-electroencephalogram-and-evoked-potential-techniques-for-amelioration-of-postoperative-delirium-and-cognitive-dysfunction-following-non-cardiac-and-non-neurosurgical-procedures-in-adults
#3
REVIEW
Yodying Punjasawadwong, Waraporn Chau-In, Malinee Laopaiboon, Sirivimol Punjasawadwong, Pathomporn Pin-On
BACKGROUND: Postoperative delirium (POD) and postoperative cognitive dysfunction (POCD) may complicate a patient's postoperative recovery in several ways. Monitoring of processed electroencephalogram (EEG) or evoked potential (EP) indices may prevent or minimize POD and POCD, probably through optimization of anaesthetic doses. OBJECTIVES: To assess whether the use of processed EEG or auditory evoked potential (AEP) indices (bispectral index (BIS), narcotrend index, cerebral state index, state entropy and response entropy, patient state index, index of consciousness, A-line autoregressive index, and auditory evoked potentials (AEP index)) as guides to anaesthetic delivery can reduce the risk of POD and POCD in non-cardiac surgical or non-neurosurgical adult patients undergoing general anaesthesia compared with standard practice where only clinical signs are used...
May 15, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29761122/bortezomib-treatment-for-severe-refractory-anti-nmda-receptor-encephalitis
#4
Yong-Won Shin, Soon-Tae Lee, Tae-Joon Kim, Jin-Sun Jun, Kon Chu
Objective: To evaluate the therapeutic potential of bortezomib, a proteasome inhibitor that target plasma cells, in order to revive stalled recovery in patients with anti- N -methyl-d-aspartate (NMDA) receptor encephalitis who remain bedridden even after aggressive immunotherapy. Methods: We consecutively enrolled patients with anti-NMDA receptor encephalitis who remained bedridden after first-line immunotherapy (steroids and intravenous immunoglobulin), second-line immunotherapy (rituximab), and tocilizumab treatment, and treated them with subcutaneous bortezomib...
May 2018: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/29756058/pupillary-dilation-reflex-and-pupillary-pain-index-evaluation-during-general-anaesthesia-a-pilot-study
#5
Davina Wildemeersch, Michiel Baeten, Natasja Peeters, Vera Saldien, Marcel Vercauteren, Guy Hans
Background: Pupillary response by pupillary dilatation reflex (PDR) is a robust reflex, even measurable during general anaesthesia. However, the ability of infrared pupillometry to detect PDR differences obtained by intraoperative opioid administration in anaesthesized patients remains largely unknown. We analyzed the performance of automated infrared pupillometry in detecting differences in pupillary dilatation reflex response by a inbuilt standardized nociceptive stimulation program in patients under general anesthesia with a standardized propofol/fentanyl scheme...
April 2018: Romanian Journal of Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/29740372/large-scale-brain-simulation-and-disorders-of-consciousness-mapping-technical-and-conceptual-issues
#6
Michele Farisco, Jeanette H Kotaleski, Kathinka Evers
Modeling and simulations have gained a leading position in contemporary attempts to describe, explain, and quantitatively predict the human brain's operations. Computer models are highly sophisticated tools developed to achieve an integrated knowledge of the brain with the aim of overcoming the actual fragmentation resulting from different neuroscientific approaches. In this paper we investigate the plausibility of simulation technologies for emulation of consciousness and the potential clinical impact of large-scale brain simulation on the assessment and care of disorders of consciousness (DOCs), e...
2018: Frontiers in Psychology
https://www.readbyqxmd.com/read/29737490/regional-entropy-of-functional-imaging-signals-varies-differently-in-sensory-and-cognitive-systems-during-propofol-modulated-loss-and-return-of-behavioral-responsiveness
#7
Xiaolin Liu, Kathryn K Lauer, B Douglas Ward, Christopher J Roberts, Suyan Liu, Suneeta Gollapudy, Robert Rohloff, William Gross, Zhan Xu, Shanshan Chen, Lubin Wang, Zheng Yang, Shi-Jiang Li, Jeffrey R Binder, Anthony G Hudetz
The level and richness of consciousness depend on information integration in the brain. Altered interregional functional interactions may indicate disrupted information integration during anesthetic-induced unconsciousness. How anesthetics modulate the amount of information in various brain regions has received less attention. Here, we propose a novel approach to quantify regional information content in the brain by the entropy of the principal components of regional blood oxygen-dependent imaging signals during graded propofol sedation...
May 8, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29728939/coping-strategies-in-caregivers-of-disorders-of-consciousness-patients
#8
Francesco Corallo, Lilla Bonanno, Viviana Lo Buono, Simona De Salvo, Carmela Rifici, Alessia Bramanti, Silvia Marino
OBJECTIVE: The management of patients with disorders of consciousness (DOC) has raised several important ethical, social, and medical issues. It is also known that families and caregivers are subjected to physical and emotional load due to their assistance activity. The aim of this observational study was to compare distress and coping strategies used among caregivers of two kinds of DOC: vegetative state (VS) and minimally conscious state (MCS). METHODS: We have enrolled 80 caregivers (mean age 47...
May 4, 2018: Neurological Sciences
https://www.readbyqxmd.com/read/29699834/respiratory-muscle-strength-and-state-of-consciousness-values-measured-prior-to-the-decanulation-in-different-levels-of-complexity-a-longitudinal-prospective-case-series-study
#9
L Diaz-Ballve, D Villalba, M Andreu, M Escobar, G Morel-Vulliez, J Lebus, E Rositi
OBJECTIVE: To describe the variables related to effective cough capacity and the state of consciousness measured prior to decannulation and compare their measured values between the different areas of care such as the Intensive Care Unit (ICU), General ward and Mechanical Ventilation Weaning and Rehabilitation Centers (MVWRC). Secondarily analyze the evolution of patients once decannulated. DESIGN: Case series, longitudinal and prospective. SCOPE: Multicentric 31 ICUs (polyvalent) and 5 MVWRC...
April 23, 2018: Medicina Intensiva
https://www.readbyqxmd.com/read/29684751/shedding-new-light-on-disorders-of-consciousness-diagnosis-the-dynamic-functional-connectivity
#10
Antonino Naro, Alessia Bramanti, Antonino Leo, Alberto Cacciola, Alfredo Manuli, Placido Bramanti, Rocco S Calabrò
It has been proposed that awareness may depend on the highly-dynamic functional connectivity of large-scale cortico-thalamo-cortical networks. We investigated how brain connectivity changes over time in the resting state in a group of patients with chronic disorders of consciousness (DoC). To this end, we assessed dynamic functional connectivity (DFC) in the resting state by analyzing the time-dependent EEG phase synchronization in five frequency bands (δ, θ, α, β, and γ). Patients in Minimally Conscious State (MCS) showed changes in DFC matrices and topography over time (mainly in the γ range), which were significantly different from those observed in patients with Unresponsive Wakefulness Syndrome (UWS)...
April 4, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29667267/the-cerebellum-after-trauma-resting-state-functional-connectivity-of-the-cerebellum-in-posttraumatic-stress-disorder-and-its-dissociative-subtype
#11
Daniela Rabellino, Maria Densmore, Jean Théberge, Margaret C McKinnon, Ruth A Lanius
The cerebellum plays a key role not only in motor function but also in affect and cognition. Although several psychopathological disorders have been associated with overall cerebellar dysfunction, it remains unclear whether different regions of the cerebellum contribute uniquely to psychopathology. Accordingly, we compared seed-based resting-state functional connectivity of the anterior cerebellum (lobule IV-V), of the posterior cerebellum (Crus I), and of the anterior vermis across posttraumatic stress disorder (PTSD; n = 65), its dissociative subtype (PTSD + DS; n = 37), and non-trauma-exposed healthy controls (HC; n = 47)...
April 17, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29665699/characterizing-signals-within-lesions-and-mapping-brain-network-connectivity-after-traumatic-axonal-injury-a-7-tesla-resting-state-fmri-study
#12
Seul Lee, Jonathan R Polimeni, Collin M Price, Brian L Edlow, Jennifer A McNab
Resting-state functional magnetic resonance imaging (RS-FMRI) has been widely used to map brain functional connectivity, but it is unclear how to probe connectivity within and around lesions. Here we characterize RS-FMRI signal time-course properties and evaluate different seed placements within and around hemorrhagic traumatic axonal injury lesions. RS-FMRI was performed on a 7 Tesla scanner in a patient who recovered consciousness after traumatic coma and in three healthy controls. Eleven lesions in the patient were characterized in terms of: 1) temporal signal-to-noise ratio (tSNR); 2) physiological noise, through comparison of noise regressors derived from the white matter (WM), cerebrospinal fluid (CSF) and gray matter (GM); and 3) seed-based functional connectivity...
April 18, 2018: Brain Connectivity
https://www.readbyqxmd.com/read/29664874/traumatic-brain-injury-and-infectious-encephalopathy-in-children-from-four-resource-limited-settings-in-africa
#13
Ericka L Fink, Amelie von Saint Andre-von Arnim, Rashmi Kumar, Patrick T Wilson, Tigist Bacha, Abenezer Tirsit Aklilu, Tsegazeab Laeke Teklemariam, Shubhada Hooli, Lisine Tuyisenge, Easmon Otupiri, Anthony Fabio, John Gianakas, Patrick M Kochanek, Derek C Angus, Robert C Tasker
OBJECTIVES: To assess the frequency, interventions, and outcomes of children presenting with traumatic brain injury or infectious encephalopathy in low-resource settings. DESIGN: Prospective study. SETTING: Four hospitals in Sub-Saharan Africa. PATIENTS: Children age 1 day to 17 years old evaluated at the hospital with traumatic brain injury or infectious encephalopathy. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: We evaluated the frequency and outcomes of children presenting consecutively over 4 weeks to any hospital department with traumatic brain injury or infectious encephalopathy...
April 16, 2018: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/29653106/assessment-of-nociception-and-pain-in-participants-with-unresponsive-or-minimally-conscious-state-after-acquired-brain-injury-the-relationship-between-the-coma-recovery-scale-revised-and-the-nociception-coma-scale-revised
#14
Camille Chatelle, Solveig L Hauger, Charlotte Martial, Frank Becker, Bernd Eifert, Dana Boering, Joseph T Giacino, Steven Laureys, Marianne Løvstad, Petra Maurer-Karattup
OBJECTIVE: Investigate the relationship between consciousness and nociceptive responsiveness (i.e., Nociception Coma Scale-Revised [NCS-R]), examine the suitability of the NCS-R for assessing nociception in participants with disorders of consciousness (DoC) and replicate previous findings on psychometric properties of the scale. DESIGN: We prospectively assessed consciousness with the Coma Recovery Scale-Revised (CRS-R). Responses during baseline, non-noxious and noxious stimulations were scored with the NCS-R, CRS-R oromotor and motor subscales...
April 10, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29649978/personalized-objects-can-optimize-the-diagnosis-of-emcs-in-the-assessment-of-functional-object-use-in-the-crs-r-a-double-blind-randomized-clinical-trial
#15
Yuxiao Sun, Jianan Wang, Lizette Heine, Wangshan Huang, Jing Wang, Nantu Hu, Xiaohua Hu, Xiaohui Fang, Supeng Huang, Steven Laureys, Haibo Di
BACKGROUND: Behavioral assessment has been acted as the gold standard for the diagnosis of disorders of consciousness (DOC) patients. The item "Functional Object Use" in the motor function sub-scale in the Coma Recovery Scale-Revised (CRS-R) is a key item in differentiating between minimally conscious state (MCS) and emergence from MCS (EMCS). However, previous studies suggested that certain specific stimuli, especially something self-relevant can affect DOC patients' scores of behavioral assessment scale...
April 12, 2018: BMC Neurology
https://www.readbyqxmd.com/read/29623396/resistance-to-eye-opening-in-patients-with-disorders-of-consciousness
#16
Hjalmar Jochem van Ommen, Aurore Thibaut, Audrey Vanhaudenhuyse, Lizette Heine, Vanessa Charland-Verville, Sarah Wannez, Olivier Bodart, Steven Laureys, Olivia Gosseries
INTRODUCTION: Resistance to eye opening (REO) is a commonly encountered phenomenon in clinical practice. We aim to investigate whether REO is a sign of consciousness or a reflex in severely brain-injured patients. METHODS: We recorded REO in chronic patients with disorders of consciousness during a multimodal diagnostic assessment. REO evaluations were performed daily in each patient and clinical diagnosis of unresponsive wakefulness syndrome (UWS), minimally conscious state with (MCS+) or without (MCS-) preserved language processing was made using the Coma Recovery Scale-Revised (CRS-R)...
April 5, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29621638/proving-cortical-death-after-vascular-coma-evoked-potentials-eeg-and-neuroimaging
#17
Florent Gobert, Frederic Dailler, Catherine Fischer, Nathalie André-Obadia, Jacques Luauté
OBJECTIVES: Several studies have shown that bilateral abolition of somatosensory evoked potentials after a nontraumatic coma has 100% specificity for nonawakening with ethical consequences for active care withdrawal. We propose to evaluate the prognostic value of bilateral abolished cortical components of SEPs in severe vascular coma. METHODS: A total of 144 comatose patients after subarachnoid haemorrhage were evaluated by multimodal evoked potentials (EPs); 7 patients presented a bilateral abolition of somatosensory and auditory EPs...
March 17, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29617724/nanopore-sequencing-technology-and-tools-for-genome-assembly-computational-analysis-of-the-current-state-bottlenecks-and-future-directions
#18
Damla Senol Cali, Jeremie S Kim, Saugata Ghose, Can Alkan, Onur Mutlu
Nanopore sequencing technology has the potential to render other sequencing technologies obsolete with its ability to generate long reads and provide portability. However, high error rates of the technology pose a challenge while generating accurate genome assemblies. The tools used for nanopore sequence analysis are of critical importance, as they should overcome the high error rates of the technology. Our goal in this work is to comprehensively analyze current publicly available tools for nanopore sequence analysis to understand their advantages, disadvantages and performance bottlenecks...
April 2, 2018: Briefings in Bioinformatics
https://www.readbyqxmd.com/read/29588029/zebrafish-a-pharmacogenetic-model-for-anesthesia
#19
Victoria Bedell, Elena Buglo, Daniel Marcato, Christian Pylatiuk, Ralf Mikut, Johannes Stegmaier, Will Scudder, Maxwell Wray, Stephan Züchner, Uwe Strähle, Ravindra Peravali, Julia E Dallman
General anesthetics are small molecules that interact with and effect the function of many different proteins to promote loss of consciousness, amnesia, and sometimes, analgesia. Owing to the complexity of this state transition and the transient nature of these drug/protein interactions, anesthetics can be difficult to study. The zebrafish is an emerging model for the discovery of both new genes required for the response to and side effects of anesthesia. Here we discuss the tools available to manipulate the zebrafish genome, including both genetic screens and genome engineering approaches...
2018: Methods in Enzymology
https://www.readbyqxmd.com/read/29575425/degrees-of-functional-connectome-abnormality-in-disorders-of-consciousness
#20
Dmitry O Sinitsyn, Liudmila A Legostaeva, Elena I Kremneva, Sofya N Morozova, Alexandra G Poydasheva, Elizaveta G Mochalova, Oksana G Chervyakova, Julia V Ryabinkina, Natalia A Suponeva, Michael A Piradov
Understanding the neuronal basis of disorders of consciousness can help improve the accuracy of their diagnosis, indicate potential targets for therapeutic interventions, and provide insights into the organization of normal conscious information processing. Measurements of brain activity have been used to find associations of the levels of consciousness with brain complexity, topological features of functional connectomes, and disruption of resting-state networks. However, obtainment of a detailed picture of activity patterns underlying the vegetative state/unresponsive wakefulness syndrome and the minimally conscious state remains a work in progress...
March 25, 2018: Human Brain Mapping
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