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https://www.readbyqxmd.com/read/29459369/the-nucleus-reuniens-controls-long-range-hippocampo-prefrontal-gamma-synchronization-during-slow-oscillations
#1
Maëva Ferraris, Antoine Ghestem, Ana F Vicente, Lauriane Nallet-Khosrofian, Christophe Bernard, Pascale P Quilichini
Gamma oscillations are involved in long-range coupling of distant regions which support various cognitive operations. Here we show in adult male rats that synchronized bursts of gamma oscillations bind the hippocampus (HPC) and prefrontal cortex (mPFC) during slow oscillations and slow wave sleep, a brain state that is central for consolidation of memory traces. These gamma bursts entrained the firing of the local HPC and mPFC neuronal populations. Neurons of the nucleus reuniens (NR), which is a structural and functional hub between HPC and mPFC, demonstrated a specific increase in their firing prior to gamma burst onset, suggesting their involvement in HPC-mPFC binding...
February 19, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29452136/neuroprotective-effects-of-valproic-acid-on-brain-ischemia-are-related-to-its-hdac-and-gsk3-inhibitions
#2
Monalisa Ribeiro Silva, Alyne Oliveira Correia, Gabriel Cabral Alencar Dos Santos, Lucas Leimig Telles Parente, Keicy Parente de Siqueira, Danielly Gonçalves Sombra Lima, Jonathan Almeida Moura, Ana Elisa da Silva Ribeiro, Roberta Oliveira Costa, Daniel Luna Lucetti, Elaine Cristina Pereira Lucetti, Kelly Rose Tavares Neves, Glauce Socorro de Barros Viana
Valproic acid (VA) is an antiepileptic that is also used for the treatment of bipolar disorders. The objective was to evaluate the neuroprotective effects of VA on a brain ischemia model. The groups of male Wistar rats were: SO (sham-operated), ischemic and ischemic treated with VA (25, 50 and 100 mg/kg, p.o.). After anesthesia with ketamine and xilazine, the animals were subjected to clamping of carotid arteries (30 min) and reperfusion. Except for the carotid clamping, the SO group was submitted to the same procedure...
February 13, 2018: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/29439328/impact-of-total-knee-arthroplasty-with-general-anesthesia-on-brain-networks-cognitive-efficiency-and-ventricular-volume-predict-functional-connectivity-decline-in-older-adults
#3
Haiqing Huang, Jared Tanner, Hari Parvataneni, Mark Rice, Ann Horgas, Mingzhou Ding, Catherine Price
 Using resting state functional magnetic resonance imaging (RS-fMRI), we explored: 1) pre- to post-operative changes in functional connectivity in default mode, salience, and central executive networks after total knee arthroplasty (TKA) with general anesthesia, and 2) the contribution of cognitive/brain reserve metrics these resting state functional declines. Individuals age 60 and older electing unilateral total knee arthroplasty (TKA; n = 48) and non-surgery peers with osteoarthritis (n = 45) completed baseline cognitive testing and baseline and post-surgery (post-baseline, 48-h post-surgery) brain MRI...
2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29410165/mid-gestational-sevoflurane-exposure-inhibits-fetal-neural-stem-cell-proliferation-and-impairs-postnatal-learning-and-memory-function-in-a-dose-dependent-manner
#4
Yuan Wang, Shaowei Yin, Hang Xue, Yating Yang, Nan Zhang, Ping Zhao
Advancements in fetal intervention procedures have led to increases in the number of pregnant women undergoing general anesthesia during the second trimester-a period characterized by extensive proliferation of fetal neural stem cells (NSCs). However, few studies have investigated the effects of mid-gestational sevoflurane exposure on fetal NSC proliferation or postnatal learning and memory function. In the present study, pregnant rats were randomly assigned to a control group (C group), a low sevoflurane concentration group (2%; L group), a high sevoflurane concentration group (3...
January 31, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29345054/isoflurane-anesthesia-in-aged-mice-and-effects-of-a1-adenosine-receptors-on-cognitive-impairment
#5
Chun-Long Zuo, Chun-Man Wang, Jin Liu, Ting Shen, Jiang-Ping Zhou, Xin-Rui Hao, Yi-Zhao Pan, Hua-Cheng Liu, Qing-Quan Lian, Han Lin
AIMS: Isoflurane may not only accelerate the process of Alzheimer's disease (AD), but increase the risk of incidence of postoperative cognitive dysfunction (POCD). However, the underlying mechanisms remain unknown. This study was designed to investigate whether isoflurane contributed to the POCD occurrence through A1 adenosine receptor (A1AR) in aged mice. METHODS: We assessed cognitive function of mice with Morris water maze (MWM) and then measured expression level of two AD biomarkers (P-tau and Aβ) and a subtype of the NMDA receptor (NR2B) in aged wild-type (WT) and homozygous A1 adenosine receptor (A1AR) knockout (KO) mice at baseline and after they were exposed to isoflurane (1...
January 17, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29344658/microrna-188-3p-is-involved-in-sevoflurane-anesthesia-induced-neuroapoptosis-by-targeting-mdm2
#6
Lei Wang, Mengliang Zheng, Shuishui Wu, Zhiqiang Niu
Sevoflurane is a commonly used inhalation anesthetic. Sevoflurane-induced neuroapoptosis and cognitive impairments in animals are widely reported, however, the underlying molecular mechanisms remain largely unknown. The results of the present study demonstrated that sevoflurane anesthesia induced spatial memory impairments in rats, as determined by the Morris water maze test. Mechanistically, the current study demonstrated that sevoflurane administration significantly enhanced the expression of microRNA (miR)‑188‑3p...
January 16, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29335389/checklist-in-colorectal-surgery-proposal-of-experts-of-the-polish-club-of-coloproctology-and-national-consultant-in-general-surgery
#7
Tomasz Banasiewicz, Łukasz Krokowicz, Piotr Richter, Adam Dziki, Piotr Krokowicz, Zbigniew Lorenc, Marek Szczepkowski, Michał Drews, Grzegorz Wallner
A checklist is a collection of information that helps reduce the risk of failure due to limitations in human memory and attention. In surgery, the first Surgical Safety Checklist (SSC), created under the supervision of WHO (World Health Organization), was established in 2007 and covers three stages related to the patient's stay in the operating theater and operation: 1. Prior to initiation (induction) of anesthesia; 2. before cutting the skin; 3. before the patient leaves the operating room Colorectal surgery is particularly at high risk for complications and relatively high mortality...
December 30, 2017: Polski Przeglad Chirurgiczny
https://www.readbyqxmd.com/read/29325538/influence-of-isoflurane-exposure-in-pregnant-rats-on-the-learning-and-memory-of-offsprings
#8
Wei Huang, Yunxia Dong, Guangyi Zhao, Yuan Wang, Jingjing Jiang, Ping Zhao
BACKGROUND: About 2% of pregnant women receive non-obstetric surgery under general anesthesia each year. During pregnancy, general anesthetics may affect brain development of the fetus. This study aimed to investigate safe dosage range of isoflurane. METHODS: Forty-eight SpragueDawley (SD) pregnant rats were randomly divided into 3 groups and inhaled 1.3% isoflurane (the Iso1 group), 2.0% isoflurane (the Iso2 group) and 50% O2 alone (the control group) for 3 h, respectively...
January 11, 2018: BMC Anesthesiology
https://www.readbyqxmd.com/read/29303789/sevoflurane-blocks-the-induction-of-long-term-potentiation-when-present-during-but-not-when-present-only-before-the-high-frequency-stimulation
#9
Jinyang Liu, Lie Yang, Daisy Lin, James E Cottrell, Ira S Kass
BACKGROUND: This study tests the hypothesis that sevoflurane blocks long-term potentiation only if it is present during the high-frequency stimulation that induces long-term potentiation. METHODS: Long-term potentiation, an electrophysiologic correlate of memory, was induced by high-frequency stimulation and measured as a persistent increase in the field excitatory postsynaptic potential slope in the CA1 region. RESULTS: Long-term potentiation was induced in the no sevoflurane group (171 ± 58% vs...
January 5, 2018: Anesthesiology
https://www.readbyqxmd.com/read/29288070/neonatal-erythropoietin-mitigates-impaired-gait-social-interaction-and-diffusion-tensor-imaging-abnormalities-in-a-rat-model-of-prenatal-brain-injury
#10
Shenandoah Robinson, Christopher J Corbett, Jesse L Winer, Lindsay A S Chan, Jessie R Maxwell, Christopher V Anstine, Tracylyn R Yellowhair, Nicholas A Andrews, Yirong Yang, Laurel O Sillerud, Lauren L Jantzie
Children who are born preterm are at risk for encephalopathy of prematurity, a leading cause of cerebral palsy, cognitive delay and behavioral disorders. Current interventions are limited and none have been shown to reverse cognitive and behavioral impairments, a primary determinant of poor quality of life for these children. Moreover, the mechanisms of perinatal brain injury that result in functional deficits and imaging abnormalities in the mature brain are poorly defined, limiting the potential to target interventions to those who may benefit most...
December 26, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/29279051/early-gestational-exposure-to-isoflurane-causes-persistent-cell-loss-in-the-dentate-gyrus-of-adult-male-rats
#11
Arvind Palanisamy, Gregory Crosby, Deborah J Culley
BACKGROUND: Our previous research showed that 4 h of maternal anesthesia with isoflurane during early gestation in pregnant rats leads to a deficit in spatial memory of adult male offspring. Because spatial memory is predominantly a hippocampally-mediated task, we asked the question if early gestational exposure to isoflurane affects development of the hippocampus in the offspring. FINDINGS: Previously behaviorally characterized adult male rats that were exposed to isoflurane during second trimester were sacrificed at 4 months of age (N = 10 and 13, control and isoflurane groups, respectively) for quantitative histology of hippocampal subregions...
December 26, 2017: Behavioral and Brain Functions: BBF
https://www.readbyqxmd.com/read/29259553/indication-of-cognitive-change-and-associated-risk-factor-after-thoracic-surgery-in-the-elderly-a-pilot-study
#12
Kay Kulason, Rui Nouchi, Yasushi Hoshikawa, Masafumi Noda, Yoshinori Okada, Ryuta Kawashima
Background: This pilot study investigated the effects of partial pulmonary lobectomy lung surgery on cognitive functions of elderly Japanese patients. It is recognized that elderly patients undergoing surgery have increased risk of Postoperative Cognitive Decline (POCD), a condition in which learning, memory, and processing speed is greatly reduced after surgery. Since elderly patients are more likely to exhibit symptoms of POCD, the incidence is increasing as the population receiving surgery is aging. Methods: Cognitive function was measured for all subjects (n = 12) before and after surgery using three different cognitive tests: Mini-Mental Status Exam-Japanese (MMSE-J), Frontal Assessment Battery (FAB), and a computerized Cogstate Brief Battery (CBB)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29225748/multiple-exposures-of-sevoflurane-during-pregnancy-induces-memory-impairment-in-young-female-offspring-mice
#13
Woosuk Chung, Seunghwan Yoon, Yong Sup Shin
Background: Earlier studies have reported conflicting results regarding long-term behavioral consequences after anesthesia during the fetal period. Previous studies also suggest several factors that may explain such conflicting data. Thus, we examined the influence of age and sex on long-term behavioral consequences after multiple sevoflurane exposures during the fetal period. Methods: C57BL/6J pregnant mice received oxygen with or without sevoflurane for 2 hours at gestational day (GD) 14-16...
December 2017: Korean Journal of Anesthesiology
https://www.readbyqxmd.com/read/29224301/-application-of-bispectral-index-monitoring-in-sedation-and-analgesia-for-flexible-bronchoscopy
#14
S R Fang, Y J Liu, N J Su, Y Shu, W Gu
Objective: To investigate the feasibility of using bispectral index monitoring in sedation and analgesia for bronchoscopy. Methods: Totally 285 patients admitted to the Respiratory Medicine Department of Nanjing First Hospital for bronchoscopy between June 2016 and December 2016 were assigned, according to their own wishes, into a conscious sedation group (171 cases receiving local anesthesia and conscious sedation, 89 males, 82 females, mean age 59±10 years) and a control group (114 cases undergoing local anesthesia, 59 males, 55 females, average age 61±12 years)...
December 12, 2017: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/29215547/hypnosis-as-an-effective-and-inexpensive-option-to-control-pain-in-transcatheter-ablation-of-cardiac-arrhythmias
#15
Umberto Barbero, Federico Ferraris, Milena Muro, Carlo Budano, Matteo Anselmino, Fiorenzo Gaita
: Supportive care for pain relief and back discomfort during electrophysiology interventions is usually needed in the electrophysiology lab, especially in long-lasting procedures like atrial fibrillation ablation. Although this is usually achieved with conventional pharmacologic anesthesia, hypnosis has recently aroused interest as a reliable tool to complement and possibly enhance conscious sedation. We collected five case of percutaneous arrhythmia ablation in which, after informed consent, hypnosis was performed by nurse anesthetists in the cath lab...
January 2018: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/29200900/genistein-attenuates-isoflurane-induced-neurotoxicity-and-improves-impaired-spatial-learning-and-memory-by-regulating-camp-creb-and-bdnf-trkb-pi3k-akt-signaling
#16
Tao Jiang, Xiu-Qin Wang, Chuan Ding, Xue-Lian Du
Anesthetics are used extensively in surgeries and related procedures to prevent pain. However, there is some concern regarding neuronal degeneration and cognitive deficits arising from regular anesthetic exposure. Recent studies have indicated that brain-derived neurotrophic factor (BDNF) and cyclic AMP response element-binding protein (CREB) are involved in learning and memory processes. Genistein, a plant-derived isoflavone, has been shown to exhibit neuroprotective effects. The present study was performed to examine the protective effect of genistein against isoflurane-induced neurotoxicity in rats...
November 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/29198599/who-is-the-boss-individual-recognition-memory-and-social-hierarchy-formation-in-crayfish
#17
Nayeli Jiménez-Morales, Karina Mendoza-Ángeles, Mercedes Porras-Villalobos, Elizabeth Ibarra-Coronado, Gabriel Roldán-Roldán, Jesús Hernández-Falcón
Under laboratory conditions, crayfish establish hierarchical orders through agonistic encounters whose outcome defines the dominant one and one, or more, submissive animals. These agonistic encounters are ritualistic, based on threats, pushes, attacks, grabs, and avoidance behaviors that include retreats and escape responses. Agonistic behavior in a triad of unfamiliar, size-matched animals is intense on the first day of social interaction and the intensity fades on daily repetitions. The dominant animal keeps its status for long periods, and the submissive ones seem to remember 'who the boss is'...
December 2, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29187700/sevoflurane-preconditioning-ameliorates-lipopolysaccharide-induced-cognitive-impairment-in-mice
#18
Maiko Satomoto, Zhongliang Sun, Yushi U Adachi, Hiroyuki Kinoshita, Koshi Makita
Systemic inflammation induces brain neuronal inflammation, in turn causing acute cognitive disorders. Furthermore, neuronal inflammation is one cause of postoperative cognitive disorder (POCD) and delirium. However, no sufficiently established pharmacological treatment is available for neurocognitive inflammation. This study evaluated the possible neuroprotective effects of preconditioning with sevoflurane anesthesia on cognition and neuroinflammatory changes in an animal model of lipopolysaccharide (LPS)-induced systemic inflammation...
November 29, 2017: Experimental Animals
https://www.readbyqxmd.com/read/29098009/maternal-sevoflurane-exposure-causes-abnormal-development-of-fetal-prefrontal-cortex-and-induces-cognitive-dysfunction-in-offspring
#19
Ruixue Song, Xiaomin Ling, Mengyuan Peng, Zhanggang Xue, Jing Cang, Fang Fang
Maternal sevoflurane exposure during pregnancy is associated with increased risk for behavioral deficits in offspring. Several studies indicated that neurogenesis abnormality may be responsible for the sevoflurane-induced neurotoxicity, but the concrete impact of sevoflurane on fetal brain development remains poorly understood. We aimed to investigate whether maternal sevoflurane exposure caused learning and memory impairment in offspring through inducing abnormal development of the fetal prefrontal cortex (PFC)...
2017: Stem Cells International
https://www.readbyqxmd.com/read/29091891/hispidulin-prevents-sevoflurane-induced-memory-dysfunction-in-aged-rats
#20
Lubin Huang, Kejing Huang, Hong Ning
AIM: As a widely used general anesthetic, sevoflurane has been found to induce cognitive and memory defectsin the elderly. This may increase the risk of Alzheimer's disease. This study explores the neuroprotective effect of hispidulin, a natural flavone compound, against sevoflurane-induced memory dysfunction. METHODS: The effect of sevoflurane exposure on memory function was evaluated by novel object recognition and Y-maze testing using an aged rat model. The apoptotic cell death in the hippocampus of rats was assessed using a TUNEL assay...
October 27, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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