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https://www.readbyqxmd.com/read/28817581/population-activity-structure-of-excitatory-and-inhibitory-neurons
#1
Sean R Bittner, Ryan C Williamson, Adam C Snyder, Ashok Litwin-Kumar, Brent Doiron, Steven M Chase, Matthew A Smith, Byron M Yu
Many studies use population analysis approaches, such as dimensionality reduction, to characterize the activity of large groups of neurons. To date, these methods have treated each neuron equally, without taking into account whether neurons are excitatory or inhibitory. We studied population activity structure as a function of neuron type by applying factor analysis to spontaneous activity from spiking networks with balanced excitation and inhibition. Throughout the study, we characterized population activity structure by measuring its dimensionality and the percentage of overall activity variance that is shared among neurons...
2017: PloS One
https://www.readbyqxmd.com/read/28817401/challenges-in-the-anesthetic-management-of-ambulatory-patients-in-the-mri-suites
#2
Jasper Deen, Yzabel Vandevivere, Peter Van de Putte
PURPOSE OF REVIEW: MRI is becoming an indispensable diagnostic tool. The need for prolonged motion-free periods has substantially increased the need for deep sedation or anesthesia in a challenging environment. This review summarises recent literature with respect to pharmacological sedative strategies, nonpharmacological alternative approaches, airway management and safety issues in the ambulatory setting. RECENT FINDINGS: Most literature researches the pediatric patient population...
August 16, 2017: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/28816893/periarticular-liposomal-bupivacaine-injection-versus-intra-articular-bupivacaine-infusion-catheter-for-analgesia-after-total-knee-arthroplasty-a-double-blinded-randomized-controlled-trial
#3
Eric B Smith, Gregory S Kazarian, Mitchell G Maltenfort, Jess H Lonner, Peter F Sharkey, Robert P Good
BACKGROUND: Intra-articular bupivacaine hydrochloride (HCl) infusion catheters and periarticular injections of liposomal bupivacaine are often used as postoperative local anesthetics. The purpose of this study was to compare the efficacies of these local anesthetics following total knee arthroplasty. METHODS: This study was a superiority trial with a randomized, controlled, double-blinded design. Patients were randomly assigned to either delivery of bupivacaine HCl by the ON-Q* Pain Relief System pump (n = 96) or by an injection of Exparel (liposomal bupivacaine) (n = 104)...
August 16, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28816883/cerebral-oxygen-saturation-during-electroconvulsive-therapy-a-secondary-analysis-of-a-randomized-crossover-trial
#4
Kamath Sriganesh, Tanmay Jadhav, Sudhir Venkataramaiah, Channaveerachari Naveen Kumar, Shyamsundar Armugham, Mariamma Philip, K R Madhusudan Reddy, Jagadisha Thirthalli, G S Umamaheswara Rao
BACKGROUND: Electroconvulsive therapy (ECT) causes acute changes in cerebral perfusion and oxygenation. Near-infrared spectroscopy is a novel, noninvasive technique to assess cerebral oxygen saturation (cSO2). We hypothesized that cSO2 increases during ECT and more so with atropine premedication and decreases when systemic desaturation (peripheral oxygen saturation <90%) occurs during ECT. METHODS: We performed a secondary analysis of a randomized trial of patients undergoing ECT for psychiatric illness during a 6-month period...
August 14, 2017: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/28816881/the-shikani-optical-stylet-as-an-alternative-to-awake-fiberoptic-intubation-in-patients-at-risk-of-secondary-cervical-spine-injury-a-randomized-controlled-trial
#5
Rabab S S Mahrous, Aly M M Ahmed
BACKGROUND: Conventional intubation of the trachea and consequent prone positioning of anesthetized patients with cervical spine instability may result in secondary neurological injury. Historically, flexible fiberoptics used to be the chief choice for patients presenting with cervical spine instability surgery with difficult airway. Recently, the rigid optical stylets have shown promise in assisting difficult intubations. PURPOSE: The aim of the present study was to compare the efficacy of Shikani optical stylet (SOS) with the flexible fiberscope for awake intubation in patients with cervical spine instability...
August 14, 2017: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/28816207/evaluation-of-the-effects-of-various-sound-pressure-levels-on-the-level-of-serum-aldosterone-concentration-in-rats
#6
Parvin Nassiri, Sajad Zare, Mohammad R Monazzam, Akram Pourbakht, Kamal Azam, Taghi Golmohammadi
INTRODUCTION: Noise exposure may have anatomical, nonauditory, and auditory influences. Considering nonauditory impacts, noise exposure can cause alterations in the automatic nervous system, including increased pulse rates, heightened blood pressure, and abnormal secretion of hormones. The present study aimed at examining the effect of various sound pressure levels (SPLs) on the serum aldosterone level among rats. MATERIALS AND METHODS: A total of 45 adult male rats with an age range of 3 to 4 months and a weight of 200 ± 50 g were randomly divided into 15 groups of three...
July 2017: Noise & Health
https://www.readbyqxmd.com/read/28816198/lingual-frenectomy-in-joubert-syndrome
#7
Vivek Gurjar, Minal Gurjar, Channaveer Pattanshetti, Banashree Sankeshwari
AIM: Our aim is to present a case of a rare disorder, such as Joubert syndrome (JS) which required oral surgical intervention under general anesthesia at a very young age to help in achieving normal developmental milestones. BACKGROUND: Ciliopathies are an emerging class of diseases of which JS is a significant member. There have been very few cases of JS with its distinguishing features which have been reported in recent literature. CASE REPORT: We herewith present a case of JS who reported to our unit with a complaint of speech abnormality...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28815798/infant-spinal-anesthesia-do-girls-need-a-larger-dose-of-local-anesthetic
#8
Geoff Frawley, Md Hamidul Huque
BACKGROUND: Gender differences in absorption, distribution, and metabolism of a number of anesthetic agents have been identified in adults. Clinically, adult studies suggest women demonstrate slower onset of opioid analgesic effects, lower spinal and epidural dose requirements, and greater sensitivity to neuromuscular blocking agents. Sex-related differences in the pharmacokinetics and pharmacodynamics of local anesthetics in neonates and infants, however, have not been well documented...
August 17, 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28815665/pharmacological-modulation-of-c-x-c-motif-chemokine-receptor-4-influences-development-of-acute-respiratory-distress-syndrome-after-lung-ischemia-reperfusion-injury
#9
Sean P Nassoiy, Favin S Babu, Heather M LaPorte, Matthias Majetschak
Activation of CXC motif chemokine receptor 4 (CXCR4) has been reported to result in lung protective effects in various experimental models. The effects of pharmacological CXCR4 modulation on the development of acute respiratory distress syndrome (ARDS) after lung injury, however, are unknown. Thus, we studied whether blockade and activation of CXCR4 influences development of ARDS in a unilateral lung ischemia-reperfusion injury rat model. Anesthetized, mechanically ventilated animals underwent right lung ischemia (series 1: 30 min; series 2: 60 min) followed by reperfusion for 300 min...
August 16, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28815276/determination-of-89-drugs-and-other-micropollutants-in-unfiltered-wastewater-and-freshwater-by-lc-ms-ms-an-alternative-sample-preparation-approach
#10
Alexandros G Asimakopoulos, Pranav Kannan, Sean Higgins, Kurunthachalam Kannan
A liquid chromatography-triple quadrupole-tandem mass spectrometry (LC-qQq-MS/MS) method was developed for simultaneous determination of 89 legal neuropsychiatric pharmaceuticals and illicit drugs (both parent compounds and metabolites) and other micropollutants in unfiltered wastewater and freshwater. The target chemicals fall under the classes of amphetamine-type stimulants, cocaine compounds, opiates and opioids, benzodiazepines, lysergic compounds, antipsychotics, anesthetics, antiepileptics, antidepressants, sympathomimetics, cannabinoids, blood thinners, antihistamines, β-blockers, caffeine derivatives, nicotine derivatives, z-drugs, new designer drugs, and Alzheimer medications...
August 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28814849/tiotropium-bromide-exerts-anti-inflammatory-effects-during-resistive-breathing-an-experimental-model-of-severe-airway-obstruction
#11
Dimitrios Toumpanakis, Konstantinos Loverdos, Vassiliki Tzouda, Vyronia Vassilakopoulou, Eleni Litsiou, Christina Magkou, Vassiliki Karavana, Michael Pieper, Theodoros Vassilakopoulos
INTRODUCTION: Resistive breathing (RB), a hallmark of obstructive airway diseases, is characterized by strenuous contractions of the inspiratory muscles that impose increased mechanical stress on the lung. RB is shown to induce pulmonary inflammation in previous healthy animals. Tiotropium bromide, an anticholinergic bronchodilator, is also shown to exert anti-inflammatory effects. The effect of tiotropium on RB-induced pulmonary inflammation is unknown. METHODS: Adult rats were anesthetized, tracheostomized and breathed spontaneously through a two-way non-rebreathing valve...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28814636/muscle-proprioceptors-in-adult-rat-mechanosensory-signaling-and-synapse-distribution-in-spinal-cord
#12
Jacob A Vincent, Hanna M Gabriel, Adam S Deardorff, Paul Nardelli, Robert E W Fyffe, Thomas J Burkholder, Timothy C Cope
The characteristic signaling and intra-spinal projections of muscle proprioceptors best described in the cat are often generalized across mammalian species. However, species-dependent adaptations within this system seem necessary to accommodate asymmetric scaling of length, velocity, and force information required by the physics of movement. In the present study we report mechanosensory responses and intraspinal destinations of three classes of muscle proprioceptors. Proprioceptors from triceps surae muscles in adult female Wistar rats anesthetized with isoflurane were physiologically classified as muscle spindle group Ia or II or as tendon organ group Ib afferents, studied for their firing responses to passive-muscle stretch, and in some cases, labeled and imaged for axon projections and varicosities in spinal segments...
August 16, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28814632/intermittent-apnea-elicits-inactivity-induced-phrenic-motor-facilitation-via-a-retinoic-acid-and-protein-synthesis-dependent-pathway
#13
Nathan A Baertsch, Tracy L Baker
Respiratory motoneuron pools must provide rhythmic inspiratory drive that is robust and reliable, yet dynamic enough to respond to respiratory challenges. One form of plasticity that is hypothesized to contribute to motor output stability by sensing and responding to inadequate respiratory neural activity is inactivity-induced phrenic motor facilitation (iPMF), an increase in inspiratory output triggered by a reduction in phrenic synaptic inputs. Evidence suggests that mechanisms giving rise to iPMF differ depending on the pattern of reduced respiratory neural activity (i...
August 16, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28814096/ankle-block-vs-single-shot-popliteal-fossa-block-as-primary-anesthesia-for-forefoot-operative-procedures-prospective-randomized-comparison
#14
Oliver N Schipper, Kenneth J Hunt, Robert B Anderson, W Hodges Davis, Carroll P Jones, Bruce E Cohen
BACKGROUND: Postoperative pain is often difficult to control with oral medications, requiring large doses of opioid analgesia. Regional anesthesia may be used for primary anesthesia, reducing the need for general anesthetic and postoperative pain medication requirements in the immediate postoperative period. The purpose of this study was to compare the analgesic effects of an ankle block (AB) to a single-shot popliteal fossa block (PFB) for patients undergoing orthopedic forefoot procedures...
August 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28813523/et-26-hydrochloride-et-26-hcl-has-similar-hemodynamic-stability-to-that-of-etomidate-in-normal-and-uncontrolled-hemorrhagic-shock-uhs-rats
#15
Bin Wang, Shouming Chen, Jun Yang, Linghui Yang, Jin Liu, Wensheng Zhang
OBJECTIVE: ET-26 HCl is a promising sedative-hypnotic anesthetic with virtually no effect on adrenocortical steroid synthesis. However, whether or not ET-26 HCl also has a sufficiently wide safety margin and hemodynamic stability similar to that of etomidate and related compounds remains unknown. In this study, the effects of ET-26 HCl, etomidate and propofol on therapeutic index, heart rate (HR), mean arterial pressure (MAP), maximal rate for left ventricular pressure rise (Dmax/t), and maximal rate for left ventricular pressure decline (Dmin/t) were investigated in healthy rats and a rat model of uncontrolled hemorrhagic shock (UHS)...
2017: PloS One
https://www.readbyqxmd.com/read/28813464/representation-of-three-dimensional-space-in-the-auditory-cortex-of-the-echolocating-bat-p-discolor
#16
Wolfgang Greiter, Uwe Firzlaff
The auditory cortex is an essential center for sound localization. In echolocating bats, combination sensitive neurons tuned to specific delays between call emission and echo perception represent target distance. In many bats, these neurons are organized as a chronotopically organized map of echo delay. However, it is still unclear to what extend these neurons can process directional information and thereby form a three-dimensional representation of space. We investigated the representation of three-dimensional space in the auditory cortex of Phyllostomus discolor...
2017: PloS One
https://www.readbyqxmd.com/read/28813367/electron-transfer-processes-occurring-on-platinum-neural-stimulating-electrodes-pulsing-experiments-for-cathodic-first-charge-balanced-biphasic-pulses-for-0-566%C3%A2-%C3%A2-%C3%A2-%C3%A2-%C3%A2-k%C3%A2-%C3%A2-%C3%A2-%C3%A2-%C3%A2-2-3-in-rat-subcutaneous-tissues
#17
Doe W Kumsa, Narendra Bhadra, Eric M Hudak, J Thomas Mortimer
OBJECTIVE: Our mission is twofold: (1) find a way to safely inject more charge through platinum electrodes than the Shannon limit (k  =  1.75) permits and (2) nurture an interest in the neural stimulation community to understand the electron transfer process occurring on neural stimulating electrodes. APPROACH: We report here on measurements of the electrode potential, performed on platinum neural stimulating electrodes in the subcutaneous space of an anesthetized rat under neural stimulation conditions...
August 16, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28812257/robotic-assisted-microvascular-surgery-skill-acquisition-in-a-rat-model
#18
Nicholas S Clarke, Johnathan Price, Travis Boyd, Stefano Salizzoni, Kenton J Zehr, Alejandro Nieponice, Pietro Bajona
Microsurgery is a technically demanding field with long learning curves. Robotic-assisted microsurgery has the ability to decrease these learning curves. We, therefore, sought to assess the feasibility of robotic-assisted microvascular surgery in a rat model, and whether this could be translated into a worthwhile skills acquisition exercise for residents. Twenty-eight rats underwent microvascular anastomosis. Procedures were performed by a trained microvascular surgeon with no robotic experience (n = 14), or a trained robotic surgeon with no microvascular experience (n = 14)...
August 10, 2017: Journal of Robotic Surgery
https://www.readbyqxmd.com/read/28811808/prevention-of-anesthesia-induced-injection-pain-of-propofol-in-pediatric-anesthesia
#19
Dabin Cheng, Lu Liu, Zheng Hu
OBJECTIVE: Propofol is a new anesthetic agent in clinical practice, but randomized double-blinded prospective studies on its role in pediatric anesthesia remain limited. We aimed to compare the preventive effects of pre-injected lidocaine or ketamine and its pre-mixture on the anesthesia-induced injection pain of propofol using a randomized double-blinded prospective method, and to compare the outcomes with those of medium-/long-chain propofol (M/LCT). METHODS: A total of 360 pediatric patients (aged 5-12 years old) who received elective surgery were randomly divided into six groups (n= 60) as follows...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28811107/local-efficacy-of-periarticular-morphine-injection-in-simultaneous-bilateral-total-knee-arthroplasty-a-prospective-randomized-double-blind-trial
#20
Kentaro Iwakiri, Yoichi Ohta, Akio Kobayashi, Yukihide Minoda, Hiroaki Nakamura
BACKGROUND: The periarticular multimodal cocktail injection including morphine is currently commonly used to reduce postoperative pain following total knee arthroplasty (TKA). Despite its analgesic effect, it frequently causes nausea, which is an adverse effect of opioids. It is inconclusive whether the intraoperative injection of periarticular morphine is effective peripherally. The aim of this study was to assess whether the addition of morphine to unilateral periarticular knee injections improves postoperative pain, range of motion, and swelling in patients undergoing simultaneous bilateral TKA...
July 21, 2017: Journal of Arthroplasty
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