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high-frequency oscillations anesthesia

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https://www.readbyqxmd.com/read/29514417/dopaminergic-neuromodulation-of-high-gamma-stimulus-phase-locking-in-gerbil-primary-auditory-cortex-mediated-by-d1-d5-receptors
#1
Matthias Deliano, Michael G K Brunk, Mohamed El-Tabbal, Maria M Zempeltzi, Max F K Happel, Frank W Ohl
Cortical release of the neurotransmitter dopamine has been implied in adapting cortical processing with respect to various functions including coding of stimulus salience, expectancy, error prediction, behavioral relevance, and learning. Dopamine agonists have been shown to modulate recurrent cortico-thalamic feedback, and should therefore also affect synchronization and amplitude of thalamo-cortical oscillations. In this study we have used multitaper spectral and time-frequency analysis of stimulus-evoked and spontaneous current source density patterns in primary auditory cortex of Mongolian gerbils to characterize dopaminergic neuromodulation of the oscillatory structure of current sources and sinks...
March 7, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29484760/disruption-in-neural-phase-synchrony-is-related-to-identification-of-inattentional-deafness-in-real-world-setting
#2
Daniel E Callan, Thibault Gateau, Gautier Durantin, Nicolas Gonthier, Frédéric Dehais
Individuals often have reduced ability to hear alarms in real world situations (e.g., anesthesia monitoring, flying airplanes) when attention is focused on another task, sometimes with devastating consequences. This phenomenon is called inattentional deafness and usually occurs under critical high workload conditions. It is difficult to simulate the critical nature of these tasks in the laboratory. In this study, dry electroencephalography is used to investigate inattentional deafness in real flight while piloting an airplane...
February 26, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29333618/age-associated-urethral-dysfunction-in-urethane-anesthetized-rats
#3
Ryu Kimura, Minoru Miyazato, Asuka Ashikari, Takuma Oshiro, Seiichi Saito
AIMS: We aimed to investigate the age-associated changes in movement coordination between the urinary bladder and the urethra in rats. METHODS: A total of 17 female Sprague-Dawley rats were used. The rats were divided into young (3 months old) and middle-aged (12-15 months old) groups. In both groups, isovolumetric cystometry and urethral perfusion pressure (UPP) measurements were performed under urethane anesthesia. After the rhythmic bladder contractions stabilized, L-arginine, a nitric oxide (NO) substrate (100 mg/kg), was administered intravenously in both groups...
January 15, 2018: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/29049297/functional-connectivity-structure-of-cortical-calcium-dynamics-in-anesthetized-and-awake-mice
#4
Patrick W Wright, Lindsey M Brier, Adam Q Bauer, Grant A Baxter, Andrew W Kraft, Matthew D Reisman, Annie R Bice, Abraham Z Snyder, Jin-Moo Lee, Joseph P Culver
The interplay between hemodynamic-based markers of cortical activity (e.g. fMRI and optical intrinsic signal imaging), which are an indirect and relatively slow report of neural activity, and underlying synaptic electrical and metabolic activity through neurovascular coupling is a topic of ongoing research and debate. As application of resting state functional connectivity measures is extended further into topics such as brain development, aging and disease, the importance of understanding the fundamental physiological basis for functional connectivity will grow...
2017: PloS One
https://www.readbyqxmd.com/read/28937235/heart-rate-variability-in-newborns
#5
K Javorka, Z Lehotska, M Kozar, Z Uhrikova, B Kolarovszki, M Javorka, M Zibolen
Heart rate (HR) and heart rate variability (HRV) in newborns is influenced by genetic determinants, gestational and postnatal age, and other variables. Premature infants have a reduced HRV. In neonatal HRV evaluated by spectral analysis, a dominant activity can be found in low frequency (LF) band (combined parasympathetic and sympathetic component). During the first postnatal days the activity in the high frequency (HF) band (parasympathetic component) rises, together with an increase in LF band and total HRV...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28931930/bistability-and-up-down-state-alternations-in-inhibition-dominated-randomly-connected-networks-of-lif-neurons
#6
Elisa M Tartaglia, Nicolas Brunel
Electrophysiological recordings in cortex in vivo have revealed a rich variety of dynamical regimes ranging from irregular asynchronous states to a diversity of synchronized states, depending on species, anesthesia, and external stimulation. The average population firing rate in these states is typically low. We study analytically and numerically a network of sparsely connected excitatory and inhibitory integrate-and-fire neurons in the inhibition-dominated, low firing rate regime. For sufficiently high values of the external input, the network exhibits an asynchronous low firing frequency state (L)...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28863720/harmonic-brain-modes-a-unifying-framework-for-linking-space-and-time-in-brain-dynamics
#7
Selen Atasoy, Gustavo Deco, Morten L Kringelbach, Joel Pearson
A fundamental characteristic of spontaneous brain activity is coherent oscillations covering a wide range of frequencies. Interestingly, these temporal oscillations are highly correlated among spatially distributed cortical areas forming structured correlation patterns known as the resting state networks, although the brain is never truly at "rest." Here, we introduce the concept of harmonic brain modes-fundamental building blocks of complex spatiotemporal patterns of neural activity. We define these elementary harmonic brain modes as harmonic modes of structural connectivity; that is, connectome harmonics, yielding fully synchronous neural activity patterns with different frequency oscillations emerging on and constrained by the particular structure of the brain...
September 1, 2017: Neuroscientist: a Review Journal Bringing Neurobiology, Neurology and Psychiatry
https://www.readbyqxmd.com/read/28659769/propofol-sevoflurane-and-ketamine-induce-a-reversible-increase-in-delta-gamma-and-theta-gamma-phase-amplitude-coupling-in-frontal-cortex-of-rat
#8
Dinesh Pal, Brian H Silverstein, Lana Sharba, Duan Li, Viviane S Hambrecht-Wiedbusch, Anthony G Hudetz, George A Mashour
Studies from human and non-human species have demonstrated a breakdown of functional corticocortical connectivity during general anesthesia induced by anesthetics with diverse molecular, neurophysiological, and pharmacological profiles. Recent studies have demonstrated that changes in long-range neural communication, and by corollary, functional connectivity, might be influenced by cross-frequency coupling (CFC) between the phase of slow oscillations and the amplitude of local fast oscillations. Phase-amplitude coupling (PAC) between slow oscillations and alpha rhythm during general anesthesia reveal distinct patterns depending on the anesthetic...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28620295/slow-and-fast-neocortical-oscillations-in-the-senescence-accelerated-mouse-model-samp8
#9
Patricia Castano-Prat, Maria Perez-Zabalza, Lorena Perez-Mendez, Rosa M Escorihuela, Maria V Sanchez-Vives
The senescence-accelerated mouse prone 8 (SAMP8) model is characterized by accelerated, progressive cognitive decline as well as Alzheimer's disease (AD)-like neurodegenerative changes, and resembles the etiology of multicausal, sporadic late-onset/age-related AD in humans. Our aim was to find whether these AD-like pathological features, together with the cognitive deficits present in the SAMP8 strain, are accompanied by disturbances in cortical network activity with respect to control mice (SAM resistance 1, SAMR1) and, if so, how the alterations in cortical activity progress with age...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28360882/vestibular-activation-habituates-the-vasovagal-response-in-the-rat
#10
Bernard Cohen, Giorgio P Martinelli, Yongqing Xiang, Theodore Raphan, Sergei B Yakushin
Vasovagal syncope is a significant medical problem without effective therapy, postulated to be related to a collapse of baroreflex function. While some studies have shown that repeated static tilts can block vasovagal syncope, this was not found in other studies. Using anesthetized, male Long-Evans rats that were highly susceptible to generation of vasovagal responses, we found that repeated activation of the vestibulosympathetic reflex (VSR) with ±2 and ±3 mA, 0.025 Hz sinusoidal galvanic vestibular stimulation (sGVS) caused incremental changes in blood pressure (BP) and heart rate (HR) that blocked further generation of vasovagal responses...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/26900572/detectability-of-the-somatosensory-evoked-high-frequency-oscillation-hfo-co-recorded-by-scalp-eeg-and-ecog-under-propofol
#11
Sergey Burnos, Tommaso Fedele, Olivier Schmid, Niklaus Krayenbühl, Johannes Sarnthein
OBJECTIVE: The somatosensory evoked potential (SEP) elicited by median nerve stimulation consists of the N20 peak together with the concurrent high frequency oscillation (HFO, > 500 Hz). We describe the conditions for HFO detection in ECoG and scalp EEG in intraoperative recordings. METHODS: During neurosurgical interventions in six patients under propofol anesthesia, the SEP was recorded from subdural electrode strips (15 recordings) and from scalp electrodes (10/15 recordings)...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/26817460/effect-of-transcutaneous-acupoint-electrical-stimulation-on-propofol-sedation-an-electroencephalogram-analysis-of-patients-undergoing-pituitary-adenomas-resection
#12
Xing Liu, Jing Wang, Baoguo Wang, Ying Hua Wang, Qinglei Teng, Jiaqing Yan, Shuangyan Wang, You Wan
BACKGROUND: Transcutaneous acupoint electrical stimulation (TAES) as a needleless acupuncture has the same effect like traditional manual acupuncture. The combination of TAES and anesthesia has been proved valid in enhancing the anesthetic effects but its mechanisms are still not clear. METHODS: In this study, we investigated the effect of TAES on anesthesia with an electroencephalogram (EEG) oscillation analysis on surgery patients anesthetized with propofol, a widely-used anesthetic in clinical practice...
January 27, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/26203657/random-sampling-with-interspike-intervals-of-the-exponential-integrate-and-fire-neuron-a-computational-interpretation-of-up-states
#13
Andreas Steimer, Kaspar Schindler
Oscillations between high and low values of the membrane potential (UP and DOWN states respectively) are an ubiquitous feature of cortical neurons during slow wave sleep and anesthesia. Nevertheless, a surprisingly small number of quantitative studies have been conducted only that deal with this phenomenon's implications for computation. Here we present a novel theory that explains on a detailed mathematical level the computational benefits of UP states. The theory is based on random sampling by means of interspike intervals (ISIs) of the exponential integrate and fire (EIF) model neuron, such that each spike is considered a sample, whose analog value corresponds to the spike's preceding ISI...
2015: PloS One
https://www.readbyqxmd.com/read/26141994/spectral-analysis-of-cooling-induced-hemodynamic-perturbations-indicates-involvement-of-sympathetic-activation-and-nitric-oxide-production-in-rats
#14
Yia-Ping Liu, Yi-Hsien Lin, Yu-Chun Chen, Po-Lei Lee, Che-Se Tung
AIMS: Oscillations in arterial pressure and heart period in response to cold stress are poorly understood. We used a telemetric device with spectral and cross-spectral analyses to assess variabilities in the heart rate (HRV) and blood pressure (BPV) of conscious rats receiving a cooling stimulus (CS) (rapid immersion of palms and soles into 4°C water) at ambient thermoneutral conditions (TC), in a cold room (CC), and when under pentobarbital anesthesia (UA). MAIN METHODS: Power spectra of very low, low, and high frequencies (VLF: 0...
September 1, 2015: Life Sciences
https://www.readbyqxmd.com/read/25937004/long-term-nmda-receptor-inhibition-affects-nmda-receptor-expression-and-alters-glutamatergic-activity-in-developing-rat-hippocampal-neurons
#15
Barbara Sinner, Oliver Friedrich, Regina Lindner, Anika Bundscherer, Bernhard M Graf
Ketamine and its stereoisomer S(+)-ketamine are widely used for sedation in pediatric anesthesia and intensive care medicine. Numerous experimental studies indicate that ketamine is potentially toxic to the developing brain. Here, we examined the long-term effects of NMDA receptor blockade on NMDA receptor subunit expression, alterations in neuronal Ca(2+)-oscillations and apoptosis. Hippocampal neurons, 15 days in culture, were exposed to either S(+)-ketamine or the NMDA receptor blocker MK801 for 24h. Cytosolic Ca(2+)-concentration was determined by fluorescence microscopy and the expression of the NMDA subunits NR1, NR2A and 2B was assessed by qRT-PCR, whereas Western blots and activated Caspase-3 served to measure the extent of apoptosis...
July 3, 2015: Toxicology
https://www.readbyqxmd.com/read/25804643/gradual-emergence-of-spontaneous-correlated-brain-activity-during-fading-of-general-anesthesia-in-rats-evidences-from-fmri-and-local-field-potentials
#16
Ruggero G Bettinardi, Núria Tort-Colet, Marcel Ruiz-Mejias, Maria V Sanchez-Vives, Gustavo Deco
Intrinsic brain activity is characterized by the presence of highly structured networks of correlated fluctuations between different regions of the brain. Such networks encompass different functions, whose properties are known to be modulated by the ongoing global brain state and are altered in several neurobiological disorders. In the present study, we induced a deep state of anesthesia in rats by means of a ketamine/medetomidine peritoneal injection, and analyzed the time course of the correlation between the brain activity in different areas while anesthesia spontaneously decreased over time...
July 1, 2015: NeuroImage
https://www.readbyqxmd.com/read/25691859/contribution-of-parvalbumin-and-somatostatin-expressing-gabaergic-neurons-to-slow-oscillations-and-the-balance-in-beta-gamma-oscillations-across-cortical-layers
#17
Toshinobu Kuki, Kazuyuki Fujihara, Hideki Miwa, Nobuaki Tamamaki, Yuchio Yanagawa, Hajime Mushiake
Cortical interneurons are classified into several subtypes that contribute to cortical oscillatory activity. Parvalbumin (PV)-expressing cells, a type of inhibitory interneuron, are involved in the gamma oscillations of local field potentials (LFPs). Under ketamine-xylazine anesthesia or sleep, mammalian cortical circuits exhibit slow oscillations in which the active-up state and silent-down state alternate at ~1 Hz. The up state is composed of various high-frequency oscillations, including gamma oscillations...
2015: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/25684752/synaptic-plasticity-related-neural-oscillations-on-hippocampus-prefrontal-cortex-pathway-in-depression
#18
C Zheng, T Zhang
It is believed that phase synchronization facilitates neural communication and neural plasticity throughout the hippocampal-cortical network, and further supports cognition and memory. The pathway from the ventral hippocampus to the medial prefrontal cortex (mPFC) is thought to play a significant role in emotional memory processing. Therefore, the information transmission on the pathway was hypothesized to be disrupted in the depressive state, which could be related to its impaired synaptic plasticity. In this study, local field potentials (LFPs) from both ventral CA1 (vCA1) and mPFC were recorded in both normal and chronic unpredictable stress (CUS) model rats under urethane anesthesia...
April 30, 2015: Neuroscience
https://www.readbyqxmd.com/read/25624643/comparison-of-monitoring-performance-of-bioreactance-versus-esophageal-doppler-in-pediatric-patients
#19
Clément Dubost, Adrien Bouglé, Calliope Hallynck, Matthieu Le Dorze, Philippe Roulleau, Catherine Baujard, Dan Benhamou
BACKGROUND AND AIMS: Cardiac output (CO) monitoring and goal-directed therapy during major abdominal surgery is currently used to decrease postoperative complications. However, few monitors are currently available for pediatric patients. Nicom(®) is a noninvasive CO monitoring technique based on the bioreactance principle (analysis of frequency variations of a delivered oscillating current traversing the thoracic cavity). Nicom(®) may be a useful monitor for pediatric patients. SUBJECTS AND METHODS: Pediatric patients undergoing major abdominal surgery under general anesthesia with cardiac monitoring by transesophageal Doppler (TED) were included...
January 2015: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/25274812/altered-activity-in-the-central-medial-thalamus-precedes-changes-in-the-neocortex-during-transitions-into-both-sleep-and-propofol-anesthesia
#20
Rowan Baker, Thomas C Gent, Qianzi Yang, Susan Parker, Alexei L Vyssotski, William Wisden, Stephen G Brickley, Nicholas P Franks
How general anesthetics cause loss of consciousness is unknown. Some evidence points toward effects on the neocortex causing "top-down" inhibition, whereas other findings suggest that these drugs act via subcortical mechanisms, possibly selectively stimulating networks promoting natural sleep. To determine whether some neuronal circuits are affected before others, we used Morlet wavelet analysis to obtain high temporal resolution in the time-varying power spectra of local field potentials recorded simultaneously in discrete brain regions at natural sleep onset and during anesthetic-induced loss of righting reflex in rats...
October 1, 2014: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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