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memory and anesthesia

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https://www.readbyqxmd.com/read/27898690/isoflurane-exposure-induces-cell-death-microglial-activation-and-modifies-the-expression-of-genes-supporting-neurodevelopment-and-cognitive-function-in-the-male-newborn-piglet-brain
#1
Kevin D Broad, Jane Hassell, Bobbi Fleiss, Go Kawano, Mojgan Ezzati, Eridan Rocha-Ferreira, Mariya Hristova, Kate Bennett, Igor Fierens, Ryan Burnett, Badr Chaban, Daniel Alonso-Alconada, Aaron Oliver-Taylor, Ilias Tachsidis, Jamshid Rostami, Pierre Gressens, Robert D Sanders, Nicola J Robertson
Exposure of the brain to general anesthesia during early infancy may adversely affect its neural and cognitive development. The mechanisms mediating this are complex, incompletely understood and may be sexually dimorphic, but include developmentally inappropriate apoptosis, inflammation and a disruption to cognitively salient gene expression. We investigated the effects of a 6h isoflurane exposure on cell death, microglial activation and gene expression in the male neonatal piglet brain. Piglets (n = 6) were randomised to: (i) naive controls or (ii) 6h isoflurane...
2016: PloS One
https://www.readbyqxmd.com/read/27882447/neonatal-repeated-exposure-to-isoflurane-not-sevoflurane-in-mice-reversibly-impaired-spatial-cognition-at-juvenile-age
#2
Jianhui Liu, Yanhong Zhao, Junjun Yang, Xiaoqing Zhang, Wei Zhang, Peijun Wang
Inhalation anesthetics facilitate surgical procedures in millions of children each year. However, animal studies demonstrate that exposure to the inhalation anesthetic isoflurane may cause neuronal cell death in developing brains. The long-term cytotoxic effects of sevoflurane, the most popular pediatric anesthetic, have not been compared with isoflurane. Thus, this study was designed to compare the effects of equipotent doses of these two anesthetics on neonatal long-term neurotoxicity. Postnatal 7-day-old (P7) C57/BL male mice were exposed to 1...
November 24, 2016: Neurochemical Research
https://www.readbyqxmd.com/read/27871631/-benefit-of-general-anesthesia-monitored-by-bispectral-index-compared-with-monitoring-guided-only-by-clinical-parameters-systematic-review-and-meta-analysis
#3
Carlos Rogério Degrandi Oliveira, Wanderley Marques Bernardo, Victor Moisés Nunes
BACKGROUND: The bispectral index parameter is used to guide the titration of general anesthesia; however, many studies have shown conflicting results regarding the benefits of bispectral index monitoring. The objective of this systematic review with meta-analysis is to evaluate the clinical impact of monitoring with the bispectral index parameter. METHODS: The search for evidence in scientific information sources was conducted during December 2013 to January 2015, the following primary databases: Medline/PubMed, LILACS, Cochrane, CINAHL, Ovid, SCOPUS and TESES...
November 18, 2016: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/27859797/in-vitro-and-in-vivo-effects-of-a-novel-dimeric-inhibitor-of-psd-95-on-excitotoxicity-and-functional-recovery-after-experimental-traumatic-brain-injury
#4
Jens Bak Sommer, Anders Bach, Hana Malá, Kristian Strømgaard, Jesper Mogensen, Darryl Scott Pickering
PSD-95 inhibitors have been shown to be neuroprotective in stroke, but have only to a very limited extent been evaluated in the treatment of traumatic brain injury (TBI) that has pathophysiological mechanisms in common with stroke. The aims of the current study were to assess the effects of a novel dimeric inhibitor of PSD-95, UCCB01-147, on histopathology and long-term cognitive outcome after controlled cortical impact (CCI) in rats. As excitotoxic cell death is thought to be a prominent part of the pathophysiology of TBI, we also investigated the neuroprotective effects of UCCB01-147 and related compounds on NMDA-induced cell death in cultured cortical neurons...
November 17, 2016: European Journal of Neuroscience
https://www.readbyqxmd.com/read/27845242/neo-adjuvant-chemotherapy-with-cisplatin-induces-low-expression-of-nmda-receptors-and-postoperative-cognitive-impairment
#5
Jing Cheng, Xiaoqing Liu, Longhui Cao, Tianhua Zhang, Huiting Li, Wenqian Lin
Whether Neo-adjuvant chemotherapy can affect patients' postoperative brain function is not clear. In this study, we investigated the effect of preoperative cisplatin treatment on postoperative cognitive function and its possible mechanism in rats. Moreover, we also tested whether the NMDAR inhibitor memantine could attenuate cisplatin-induced alterations. 12-month-oldSprague-Dawley rats randomly received an intraperitoneal injection of either cisplatin once a week at a dose of 3mg/kg for three consecutive weeks or an equivalent volume of normal saline...
November 11, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27828927/effect-of-low-dose-of-ketamine-on-learning-memory-function-in-patients-undergoing-electroconvulsive-therapy-a-randomized-double-blind-controlled-clinical-study
#6
Qibin Chen, Su Min, Xuechao Hao, Lihua Peng, Huaqing Meng, Qinghua Luo, Jianmei Chen, Xiao Li
OBJECTIVES: Converging evidence suggests that low doses of ketamine have antidepressant effects. The feasibility and safety of administering low doses of ketamine as adjunctive medication during electroconvulsive therapy (ECT) to enhance ECT efficacy and mitigate cognitive impairment has attracted much attention. This study investigated the effects of low doses of ketamine on learning and memory in patients undergoing ECT under propofol anesthesia. METHODS: This randomized, placebo-controlled, double-blind study recruited patients with moderate to severe depressive disorders who failed to respond to antidepressants and were scheduled to receive ECT...
November 3, 2016: Journal of ECT
https://www.readbyqxmd.com/read/27822212/systemic-hmgb1-neutralization-prevents-postoperative-neurocognitive-dysfunction-in-aged-rats
#7
Niccolò Terrando, Ting Yang, Xueqin Wang, Jiakai Fang, Mengya Cao, Ulf Andersson, Harris Helena Erlandsson, Wen Ouyang, Jianbin Tong
Postoperative neurocognitive disorders are common complications in elderly patients following surgery or critical illness. High mobility group box 1 protein (HMGB1) is rapidly released after tissue trauma and critically involved in response to sterile injury. Herein, we assessed the role of HMGB1 after liver surgery in aged rats and explored the therapeutic potential of a neutralizing anti-HMGB1 monoclonal antibody in a clinically relevant model of postoperative neurocognitive disorders. Nineteen to twenty-two months Sprague-Dawley rats were randomly assigned as: (1) control with saline; (2) surgery, a partial hepatolobectomy under sevoflurane anesthesia and analgesia, + immunoglobulin G as control antibody; (3) surgery + anti-HMGB1...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27790356/moderate-hypothermia-and-its-effects-in-reducing-the-applied-dose-of-anesthetics-for-patients-with-opium-dependence-in-cardiac-surgery-a-randomized-controlled-trial
#8
Reza Jalaian Taghadomi, Ebrahim Golmakani, Kambiz Alizadeh, Behrooz Mottahedi, Ali Rahdari, Shima Sheybani
BACKGROUND: An increasing number of patients addicted to opium are experiencing awareness during coronary artery bypass surgery (CABG) as a result of tolerance to anesthetics. OBJECTIVES: This research was primarily intended to determine the potential diminishing effects of moderate hypothermia on anesthetic dosage and recall of anesthesia during the procedure. METHODS: In this double-blind randomized controlled trial, a total of 80 CABG candidates with known addiction to opium were divided into two groups: one normothermic (N) and the other moderately hypothermic (H), both undergoing induction as well as close monitoring from September 2014 to January 2016...
September 2016: Electronic Physician
https://www.readbyqxmd.com/read/27790135/nox-2-mediated-phenotype-loss-of-hippocampal-parvalbumin-interneurons-might-contribute-to-postoperative-cognitive-decline-in-aging-mice
#9
Li-Li Qiu, Dan Luo, Hui Zhang, Yun S Shi, Yan-Jun Li, Dan Wu, Jiang Chen, Mu-Huo Ji, Jian-Jun Yang
Postoperative cognitive decline (POCD) is a common complication following anesthesia and surgery, especially in elderly patients; however, the precise mechanisms of POCD remain unclear. Here, we investigated whether nicotinamide adenine dinucleotide phosphate (NADPH) oxidase mediated-abnormalities in parvalbumin (PV) interneurons play an important role in the pathophysiology of POCD. The animal model was established using isoflurane anesthesia and exploratory laparotomy in 16-month-old male C57BL/6 mice. For interventional experiments, mice were chronically treated with the NADPH oxidase inhibitor apocynin (APO)...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27785338/dose-dependent-effects-of-sevoflurane-exposure-during-early-lifetime-on-apoptosis-in-hippocampus-and-neurocognitive-outcomes-in-sprague-dawley-rats
#10
Xue Zhou, Wenda Li, Xiaohui Chen, Xiaoyu Yang, Zhibin Zhou, Dihan Lu, Xia Feng
Sevoflurane has become a main method for induction of anesthesia in pediatric populations. Preclinical evidence suggest the neurotoxic effect of volatile anesthetics on the developing brain including sevoflurane. This study investigates the effect of different doses of sevoflurane on the developing brain. In this study, Sprague-Dawley rats of postnatal (P) day 7 were exposed to 0.3%, 1.3% and 2.3% sevoflurane for 6 hours. 6 hours after exposure, Nissl staining was performed to observe the morphological changes of the hippocampus and western-blot was done to evaluate the expression changes in cytochrome c, cleaved caspase-3, Bcl-2 and Bax...
2016: International Journal of Physiology, Pathophysiology and Pharmacology
https://www.readbyqxmd.com/read/27768775/dexmedetomidine-acts-via-the-jak2-stat3-pathway-to-attenuate-isoflurane-induced-neurocognitive-deficits-in-senile-mice
#11
Yanna Si, Yuan Zhang, Liu Han, Lihai Chen, Yajie Xu, Fan Sun, Muhuo Ji, Jianjun Yang, Hongguang Bao
BACKGROUND: Previous studies showed that isoflurane-induced cognitive deficits could be alleviated by dexmedetomidine in young animal subjects. In the current study, we examine whether dexmedetomidine could also alleviate isoflurane-induced cognitive deficits in senile animals. METHODS: Senile male C57BL/6 mice (20 months) received dexmedetomidine (50 μg/kg, i.p.) or vehicle 30 minutes prior to isoflurane exposure (1.3% for 4 h). Cognitive function was assessed 19 days later using a 5-day testing regimen with Morris water maze...
2016: PloS One
https://www.readbyqxmd.com/read/27768692/genetic-dissection-of-aversive-associative-olfactory-learning-and-memory-in-drosophila-larvae
#12
Annekathrin Widmann, Marc Artinger, Lukas Biesinger, Kathrin Boepple, Christina Peters, Jana Schlechter, Mareike Selcho, Andreas S Thum
Memory formation is a highly complex and dynamic process. It consists of different phases, which depend on various neuronal and molecular mechanisms. In adult Drosophila it was shown that memory formation after aversive Pavlovian conditioning includes-besides other forms-a labile short-term component that consolidates within hours to a longer-lasting memory. Accordingly, memory formation requires the timely controlled action of different neuronal circuits, neurotransmitters, neuromodulators and molecules that were initially identified by classical forward genetic approaches...
October 2016: PLoS Genetics
https://www.readbyqxmd.com/read/27765179/from-the-laboratory-bench-to-the-operating-room-the-role-of-the-surgeon-in-cancer-prevention
#13
Terry C Lairmore
BACKGROUND: The last 200 years have seen remarkable achievements in the art and clinical practice of surgery. These advances include the introduction of antisepsis, anesthesia, vascular anastomosis, antimicrobials, organ transplantation, and the widespread application of minimally invasive operative procedures. Very recently, a surgical procedure has been shown to cure diabetes, representing the most effective treatment of a metabolic disorder by surgeons. METHODS: The author reviewed the major surgical milestones in the modern surgical era and prepared this monograph for presentation as the Claude H...
September 30, 2016: American Journal of Surgery
https://www.readbyqxmd.com/read/27755141/current-thinking-regarding-potential-neurotoxicity-of-general-anesthesia-in-infants
#14
Mary Ellen McCann, Jurgen de Graaff
PURPOSE OF REVIEW: Numerous preclinical studies have shown that general anesthetics adversely influence the development of young brains. These adverse effects are dose-dependent occurring in specific stages of brain development. Histologic examinations show increased apoptosis, pathological neurogenesis and dendritic formation after exposure in infant animals to virtually all general anesthetics at a clinically effective dose which are associated with memory and behavioral changes at adulthood...
January 2017: Current Opinion in Urology
https://www.readbyqxmd.com/read/27733186/deferoxamine-regulates-neuroinflammation-and-iron-homeostasis-in-a-mouse-model-of-postoperative-cognitive-dysfunction
#15
Yuping Li, Ke Pan, Lin Chen, Jiao-Lin Ning, Xiaojun Li, Ting Yang, Niccolò Terrando, Jianteng Gu, Guocai Tao
BACKGROUND: Postoperative cognitive dysfunction (POCD) is a common complication after surgery, especially amongst elderly patients. Neuroinflammation and iron homeostasis are key hallmarks of several neurological disorders. In this study, we investigated the role of deferoxamine (DFO), a clinically used iron chelator, in a mouse model of surgery-induced cognitive dysfunction and assessed its neuroprotective effects on neuroinflammation, oxidative stress, and memory function. METHODS: A model of laparotomy under general anesthesia and analgesia was used to study POCD...
October 12, 2016: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/27687317/-anesthesia-in-anti-n-methyl-d-aspartate-receptor-encephalitis-is-general-anesthesia-a-requisite-a-case-report
#16
Sook Hui Chaw, Li Lian Foo, Lucy Chan, Kang Kwong Wong, Suhailah Abdullah, Boon Kiong Lim
Anti-N-methyl-d-aspartate receptor encephalitis is a recently described neurological disorder and an increasingly recognized cause of psychosis, movement disorders and autonomic dysfunction. We report 20-year-old Chinese female who presented with generalized tonic-clonic seizures, recent memory loss, visual hallucinations and abnormal behavior. Anti-N-methyl-d-aspartate receptor encephalitis was diagnosed and a computed tomography scan of abdomen reviewed a left adnexal tumor. We describe the first such case report of a patient with anti-N-methyl-d-aspartate receptor encephalitis who was given a bilateral transversus abdominis plane block as the sole anesthetic for removal of ovarian tumor...
September 26, 2016: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/27648470/vta-projection-neurons-releasing-gaba-and-glutamate-in-the-dentate-gyrus
#17
Niels R Ntamati, Christian Lüscher
Both dopamine and nondopamine neurons from the ventral tegmental area (VTA) project to a variety of brain regions. Here we examine nondopaminergic neurons in the mouse VTA that send long-range projections to the hippocampus. Using a combination of retrograde tracers, optogenetic tools, and electrophysiological recordings, we show that VTA GABAergic axons make synaptic contacts in the granule cell layer of the dentate gyrus, where we can elicit small postsynaptic currents. Surprisingly, the currents displayed a partial sensitivity to both bicuculline and NBQX, suggesting that these mesohippocampal neurons corelease both GABA and glutamate...
July 2016: ENeuro
https://www.readbyqxmd.com/read/27635414/laparoscopic-transabdominal-preperitoneal-inguinal-hernia-repair-using-memory-ring-mesh-a-pilot-study
#18
Takeshi Matsutani, Tsutomu Nomura, Nobutoshi Hagiwara, Akihisa Matsuda, Yoshimune Takao, Eiji Uchida
Purpose. To evaluate the feasibility, safety, and effectiveness of laparoscopic transabdominal preperitoneal (TAPP) inguinal hernia repair using a memory-ring patch (Polysoft™ mesh). Patients and Methods. Between April 2010 and March 2013, a total of 76 inguinal hernias underwent TAPP repair using Polysoft mesh in 67 adults under general anesthesia. Three different senior resident surgeons performed TAPP repair under the instruction of a specialist surgeon. Nine patients had bilateral hernias. The 76 hernias included 37 indirect inguinal hernias, 29 direct hernias, 1 femoral hernia, 1 pantaloon hernia (combined direct/indirect inguinal hernia), and 8 recurrent hernias after open anterior hernia repair...
2016: Surgery Research and Practice
https://www.readbyqxmd.com/read/27631973/pathological-changes-of-the-hippocampus-and-cognitive-dysfunction-following-frontal-lobe-surgery-in-a-rat-model
#19
Santiago Hem, Romina Albite, Monica Loresi, Jorge Rasmussen, Pablo Ajler, Claudio Yampolsky, Joseph D Chabot, Peter C Gerszten, Ezequiel Goldschmidt
BACKGROUND: Postoperative cognitive dysfunction (POCD) is a known complication after intracranial surgery. Impaired hippocampal neurogenesis has been associated with cognitive dysfunction in animal models. METHODS: In order to assess hippocampal changes after brain surgery, a frontal lobe corticectomy was performed in ten adult Wistar rats (group 4). Three different control groups (n = 10 each) included no treatment (G1), general anesthesia alone (G2), and craniectomy without dural opening (G3)...
November 2016: Acta Neurochirurgica
https://www.readbyqxmd.com/read/27628686/effects-of-propofol-general-anesthesia-on-olfactory-relearning
#20
Li-Jie Jia, Pei Tang, Nicole R Brandon, Yan Luo, Buwei Yu, Yan Xu
How general anesthesia interferes with sensory processing to cause amnesia remains unclear. Here, we show that activation of a learning-associated immediate early gene in rat olfactory cortices is uninterrupted by propofol, an intravenous general anesthetic with putative actions on the inhibitory GABAA receptors. Once learned under anesthesia, a novel odor can no longer re-activate the same high-level transcription programming during subsequent conscious relearning. Behavioral tests indicate that the animals' ability to consciously relearn a pure odorant, first experienced under general anesthesia, is indeed compromised...
September 15, 2016: Scientific Reports
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