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Burst suppression

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https://www.readbyqxmd.com/read/28545673/burst-suppression-pattern-on-electroencephalogram-secondary-to-valproic-acid-induced-hyperammonemic-encephalopathy
#1
Koshi A Cherian, Alan D Legatt
BACKGROUND: Valproic acid may induce hyperammonemic encephalopathy. Various electroencephalogram (EEG) abnormalities have been documented in association with this condition, but not burst suppression, an abnormal EEG pattern that is associated with severe encephalopathy. METHODS: Serial EEGs, clinical observations, and laboratory findings were analyzed. PATIENT DESCRIPTION: This 13-year-old girl with autism and intractable epilepsy experienced increased seizures; her valproic acid dose was increased and other antiepileptic drugs were administered...
January 4, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28544182/burst-or-high-frequency-10-khz-spinal-cord-stimulation-in-failed-back-surgery-syndrome-patients-with-predominant-back-pain-one-year-comparative-data
#2
Sajjad Muhammad, Sandra Roeske, Shafqat Rasul Chaudhry, Thomas Mehari Kinfe
OBJECTIVES: Burst and 10 kHz spinal cord stimulation (SCS) demonstrated improvement for failed back surgery syndrome (FBSS) with predominant, refractory back pain. Here, we report the long-term follow-up of a previously published study comparing the safety and efficacy of burst vs. 10 kHz SCS for predominant back pain (70% of global pain) of FBSS patients. METHODS: This comparative, observational study extended the follow-up period up to 20 months evaluating both SCS modalities...
May 24, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28537735/improved-superresolution-imaging-using-telegraph-noise-in-organic-semiconductor-nanoparticles
#3
Yifei Jiang, Muskendol Novoa, Teeranan Nongnual, Rhonda Powell, Terri F Bruce, Jason D McNeill
Small semiconductor structures often exhibit "telegraph noise". If the number of charge carriers is small, then spontaneous changes in the number of carriers can lead to abrupt switching between two or more discrete levels, leading to burst noise or popcorn noise in transistors. We have observed similar behavior in the fluorescence of organic semiconductor nanoparticles, where typical carrier populations are often less than ~10 carriers per nanoparticle. Spontaneous changes in the number of charges results in abrupt switching between 2 or more fluorescence intensity levels, since the charges act as highly efficient fluorescence quenchers...
May 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28528963/neuronal-activity-patterns-in-the-developing-barrel-cortex
#4
Heiko J Luhmann, Rustem Khazipov
The developing barrel cortex reveals a rich repertoire of neuronal activity patterns, which have been also found in other sensory neocortical areas and in other species including the somatosensory cortex of preterm human infants. The earliest stage is characterized by asynchronous, sparse single cell firing at low frequencies. During the second stage neurons show correlated firing, which is initially mediated by electrical synapses and subsequently transforms into network bursts depending on chemical synapses...
May 18, 2017: Neuroscience
https://www.readbyqxmd.com/read/28527340/induction-of-cell-death-by-tospoviral-protein-nss-and-the-motif-critical-for-cell-death-does-not-control-rna-silencing-suppression-activity
#5
Ajeet Singh, Vipin Permar, R K Jain, Suneha Goswami, Ranjeet Ranjan Kumar, Tomas Canto, Peter Palukaitis, Shelly Praveen
Groundnut bud necrosis virus induces necrotic symptoms in different hosts. Previous studies showed reactive oxygen species-mediated programmed cell death (PCD) resulted in necrotic symptoms. Transgenic expression of viral protein NSs mimics viral symptoms. Here, we showed a role for NSs in influencing oxidative burst in the cell, by analyzing H2O2 accumulation, activities of antioxidant enzymes and expression levels of vacuolar processing enzymes, H2O2-responsive microRNA 319a.2 plus its possible target metacaspase-8...
May 17, 2017: Virology
https://www.readbyqxmd.com/read/28522735/d3-receptors-regulate-excitability-in-a-unique-class-of-prefrontal-pyramidal-cell
#6
Rebecca L Clarkson, Alayna T Liptak, Steven M Gee, Vikaas S Sohal, Kevin J Bender
The D3 dopamine receptor, a member of the Gi-coupled D2-family of dopamine receptors, is expressed throughout limbic circuits affected in neuropsychiatric disorders, including prefrontal cortex. These receptors are important for prefrontal executive function, as pharmacological and genetic manipulations that affect prefrontal D3 receptors alter anxiety, social interaction, and reversal learning. And yet, the mechanisms by which D3 receptors regulate prefrontal circuits, and whether D3 receptors regulate specific prefrontal subnetworks, remain unknown...
May 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28521637/the-receptor-like-cytoplasmic-kinase-bsr1-mediates-chitin-induced-defense-signaling-in-rice-cells
#7
Yasukazu Kanda, Naoki Yokotani, Satoru Maeda, Yoko Nishizawa, Takashi Kamakura, Masaki Mori
Broad-Spectrum Resistance 1 (BSR1) encodes a rice receptor-like cytoplasmic kinase, and enhances disease resistance when overexpressed. Rice plants overexpressing BSR1 are highly resistant to diverse pathogens, including rice blast fungus. However, the mechanism responsible for this resistance has not been fully characterized. To analyze the BSR1 function, BSR1-knockout (BSR1-KO) plants were generated using a clustered regularly interspaced short palindromic repeat (CRISPR)/CRISPR-associated protein 9 (Cas9) system...
May 18, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28510268/effect-of-intervention-initiation-timing-of-pulsed-electromagnetic-field-on-ovariectomy-induced-osteoporosis-in-rats
#8
Jun Zhou, Yuan Liao, Yahua Zeng, Haitao Xie, Chengxiao Fu, Neng Li
The aim of this study is to explore the effect of timing of initiation of pulsed electromagnetic field (PEMF) therapy on bone mass, microarchitecture, and biomechanical properties, and to investigate receptor activator of NF-kB (RANK) expression in ovariectomized (OVX) rats. Sixty female Sprague-Dawley rats were randomly divided into two equal batches of three groups each (10 rats in each group). The first batch comprised of sham-operated (Sham-0 group), ovariectomized (OVX-0 group), and ovariectomized plus treated with PEMF starting from the day of OVX (Early PEMF group)...
May 16, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28510137/possible-mechanism-of-bursting-suppression-in-nociceptive-neurons
#9
O E Dick, B V Krylov, A D Nozdrachev
The use of the mathematical model of rat nociceptive neuron membrane allowed us to predict a new mechanism of suppression of ectopic bursting discharges, which arise in neurons of dorsal root ganglia and are one of the causes of neuropathic pain. The treatment with comenic acid leads to switching off the ectopic bursting discharges due to a decrease in the effective charge transferring via the activation gating structure of the slow sodium channels (Na V1.8a). Comenic acid is a drug substance of a new non-opioid analgesic [1] Thus, this analgesic not only reduces the frequency of rhythmic discharges of nociceptive neuron membrane [2] but also it suppresses its ectopic bursting discharges...
March 2017: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28506244/early-eeg-for-outcome-prediction-of-postanoxic-coma-prospective-cohort-study-with-cost-minimization-analysis
#10
Lotte Sondag, Barry J Ruijter, Marleen C Tjepkema-Cloostermans, Albertus Beishuizen, Frank H Bosch, Janine A van Til, Michel J A M van Putten, Jeannette Hofmeijer
BACKGROUND: We recently showed that electroencephalography (EEG) patterns within the first 24 hours robustly contribute to multimodal prediction of poor or good neurological outcome of comatose patients after cardiac arrest. Here, we confirm these results and present a cost-minimization analysis. Early prognosis contributes to communication between doctors and family, and may prevent inappropriate treatment. METHODS: A prospective cohort study including 430 subsequent comatose patients after cardiac arrest was conducted at intensive care units of two teaching hospitals...
May 15, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28505727/multiple-binding-sites-for-transcriptional-repressors-can-produce-regular-bursting-and-enhance-noise-suppression
#11
Iván M Lengyel, Luis G Morelli
Cells may control fluctuations in protein levels by means of negative autoregulation, where transcription factors bind DNA sites to repress their own production. Theoretical studies have assumed a single binding site for the repressor, while in most species it is found that multiple binding sites are arranged in clusters. We study a stochastic description of negative autoregulation with multiple binding sites for the repressor. We find that increasing the number of binding sites induces regular bursting of gene products...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28501415/reduced-electrode-arrays-for-the-automated-detection-of-rhythmic-and-periodic-patterns-in-the-intensive-care-unit-frequently-tried-frequently-failed
#12
J Herta, J Koren, F Fürbass, M Hartmann, A Gruber, C Baumgartner
OBJECTIVE: To investigate the effect of systematic electrode reduction from a common 10-20 EEG system on pattern detection sensitivity (SEN). METHODS: Two reviewers rated 17130 one-minute segments of 83 prospectively recorded cEEGs according to the ACNS standardized critical care EEG terminology (CCET), including burst suppression patterns (BS) and unequivocal electrographic seizures. Consensus annotations between reviewers were used as a gold standard to determine pattern detection SEN and specificity (SPE) of a computational algorithm (baseline, 19 electrodes)...
April 26, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28486575/burst-suppression-ratio-underestimates-absolute-duration-of-electroencephalogram-suppression-compared-with-visual-analysis-of-intraoperative-electroencephalogram
#13
W G Muhlhofer, R Zak, T Kamal, B Rizvi, L P Sands, M Yuan, X Zhang, J M Leung
Background: Machine-generated indices based on quantitative electroencephalography (EEG), such as the patient state index (PSI™) and burst-suppression ratio (BSR), are increasingly being used to monitor intraoperative depth of anaesthesia in the endeavour to improve postoperative neurological outcomes, such as postoperative delirium (POD). However, the accuracy of the BSR compared with direct visualization of the EEG trace with regard to the prediction of POD has not been evaluated previously...
May 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28484928/comparison-of-quantitative-characteristics-of-early-post-resuscitation-eeg-between-asphyxial-and-ventricular-fibrillation-cardiac-arrest-in-rats
#14
Bihua Chen, Gang Chen, Chenxi Dai, Pei Wang, Lei Zhang, Yuanyuan Huang, Yongqin Li
BACKGROUND: Quantitative electroencephalogram (EEG) analysis has shown promising results in studying brain injury and functional recovery after cardiac arrest (CA). However, whether the quantitative characteristics of EEG, as potential indicators of neurological prognosis, are influenced by CA causes is unknown. The purpose of this study was designed to compare the quantitative characteristics of early post-resuscitation EEG between asphyxial CA (ACA) and ventricular fibrillation CA (VFCA) in rats...
May 8, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28482107/phasic-rem-transiently-approaches-wakefulness-in-the-human-cortex-a-single-pulse-electrical-stimulation-study
#15
Kiyohide Usami, Riki Matsumoto, Katsuya Kobayashi, Takefumi Hitomi, Masao Matsuhashi, Akihiro Shimotake, Takayuki Kikuchi, Kazumichi Yoshida, Takeharu Kunieda, Nobuhiro Mikuni, Susumu Miyamoto, Ryosuke Takahashi, Akio Ikeda
Study Objectives: To investigate the changes in cortical neural responses induced by external inputs during phasic rapid eye movement (REM) sleep. Methods: Single-pulse electrical stimulation (SPES) was directly applied to the human cortex during REM sleep through subdural electrodes, in seven patients who underwent invasive presurgical evaluation for intractable partial epilepsy. SPES was applied to parts of the cortex through the subdural electrodes, and induced cortical responses were recorded from adjacent and remote cortical areas...
May 8, 2017: Sleep
https://www.readbyqxmd.com/read/28480607/adiponectin-enhances-quiescence-exit-of-murine-hematopoietic-stem-cells-and-hematopoietic-recovery-through-mtorc1-potentiation
#16
Yosuke Masamoto, Shunya Arai, Tomohiko Sato, Naoto Kubota, Iseki Takamoto, Takashi Kadowaki, Mineo Kurokawa
Myelotoxic injury, such as chemotherapeutic agents and ionizing radiation, unlocks the vigorous power of hematopoietic stem cells (HSCs) to replenish the hematopoietic system, making quiescent HSCs enter the cell cycle. Considering that both HSC-intrinsic and -extrinsic mechanisms enforce quiescence of HSCs, the drastic change in bone marrow (BM) environment after injury, represented by massive expansion of BM adipocytes, might trigger HSC activation. BM adipocytes, the major cellular component in the ablated marrow, however, reportedly suppress proliferation of hematopoietic cells, which may indicate the BM adipocytogenesis is an irrational response of injured organism...
May 8, 2017: Stem Cells
https://www.readbyqxmd.com/read/28475414/characterization-and-antitumor-efficacy-of-poly-l-lactid-acid-based-etoposide-loaded-implants
#17
Li Gao, Chuanqi Xie, Yuzhi Du, Xiaodong Wang, Erkang Xuan, Xiuxiu Liu, Yang Zhao, Jianjian Xu, Lan Luo
Etoposide is widely used in the chemotherapy of a variety of malignancies. But the strong lipophilicity, poor bioavailability, and severe side effects of etoposide limit its clinical application. The aim of this study was to develop sustained-release etoposide-loaded implants and evaluate antitumor activity of the implants after intratumoral implantation. We prepared the implants containing etoposide, poly(L-lactid acid) and polyethylene glycol 4000 by the direct compression method. The implants were characterized regarding drug-excipient compatibility, content uniformity, morphology, sterility, in vitro, and in vivo release profiles...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28470273/dynamical-regimes-of-four-oscillators-with-excitatory-pulse-coupling
#18
Dmitry A Safonov, Vladimir V Klinshov, Vladimir K Vanag
The dynamical regimes of four almost identical oscillators with pulsatile excitatory coupling have been studied theoretically with two models: a kinetic model of the Belousov-Zhabotinsky reaction and a phase-reduced model. Unidirectional coupling on a ring and all-to-all coupling have been considered. The time delay τ between the moments of a spike in one oscillator and a pulse perturbation of the other(s) plays a crucial role in the emergence of the dynamical modes, which are classified as regular, complex, and OS (oscillation-suppression)-modes...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28464513/phagocyte-activity-in-the-peripheral-blood-of-pregnant-women-with-systemic-lupus-erythematosus-and-in-the-cord-blood-of-their-newborns
#19
Gennady T Sukhikh, Valentina G Safronova, Ludmila V Vanko, Nataliya K Matveeva, Anastasiya S Belyaeva, Ekaterina V Fedorova, Marina A Nikolaeva, Nataliya I Klimenchenko, Lyubov V Krechetova
AIM: To detect faults in phagocytosis in peripheral blood cells of pregnant women with systemic lupus erythematosus (SLE) and in cord blood of their newborns. METHODS: Pregnant women fulfilled ≥ 4 American College of Rheumatology criteria for SLE and their newborns were recruited. Pregnant women without SLE and their newborns constituted controls. Phagocytosis and respiratory burst were measured using PHAGOTEST and BURSTTEST kits (Biotechnology GmbH, Germany) on FACSCalibur™ flow cytometer...
May 2, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/28464105/effects-of-dexamethasone-treatment-and-respiratory-vaccination-on-rectal-temperature-complete-blood-count-and-functional-capacities-of-neutrophils-in-beef-steers
#20
H D Hughes, J A Carroll, N C Burdick Sanchez, S L Roberts, P R Broadway, N D May, M A Ballou, J T Richeson
The objective of this research was to examine the effects of dexamethasone (DEX) treatment on various aspects of immunity following administration of a multivalent respiratory vaccine, using a model intended to mimic acute versus chronic stress. Angus × Hereford steers ( = 32; 209 ± 8 kg) were stratified by BW and randomly assigned to 1 of 3 treatments: 1) acute stress (ACU), in which 0.5 mg/kg BW DEX was intravenously administered at 1000 h only on d 0; 2) chronic stress (CHR), in which 0.5 mg/kg BW DEX was intravenously administered at 1000 h on d -3 to 0; or 3) control (CON), in which no DEX was administered...
April 2017: Journal of Animal Science
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