Τετάρτη 19 Ιουλίου 2017
Scalp Block: Tool for Diagnosis in Postoperative Headache of Unknown Origin.
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Role of anesthesia in endovascular stroke therapy.
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Dissecting patterns of preparatory activity in the frontal eye fields during pursuit target selection
We investigated the composition of preparatory activity of frontal eye field (FEF) neurons in monkeys performing a pursuit target selection task. In response to the orthogonal motion of a large and a small reward target, monkeys initiated pursuit biased towards the direction of large reward target motion. FEF neurons exhibited robust preparatory activity preceding movement initiation in this task. Preparatory activity consisted of two components, ramping activity that was constant across target selection conditions and a flat offset in firing rates that signaled the target selection condition. Ramping activity accounted for 50% of the variance in the preparatory activity and was linked most strongly, on a trial-by-trial basis, to pursuit eye movement latency rather than to its direction or gain. The offset in firing rates that discriminated target selection conditions accounted for 25% of the variance in the preparatory activity, and was commensurate with a winner-take-all representation signaling the direction of large reward target motion rather than a representation that matched the parameters of the upcoming movement. These offer new insights into the role the frontal eye fields play in target selection and pursuit control. They show that preparatory activity in the FEF signals more strongly when to move rather than where or how to move, and suggest that structures outside the FEF augment its contributions to the target selection process.
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Muscle disuse caused by botulinum toxin injection leads to increased central gain of the stretch reflex in the rat.
Botulinum toxin (Btx) is used in children with cerebral palsy and other neurological patients to diminish spasticity and reduce the risk of development of contractures. Here, we investigated changes in the central gain of the stretch reflex circuitry in response to botulinum toxin injection in the triceps surae muscle in rats. Experiments were performed in 21 rats. 8 rats were in a control group and 13 rats were injected with 6 IU of Btx in the left triceps surae muscle. Two weeks after Btx injection larger monosynaptic reflexes (MSR) were recorded from the left (injected) than the right (non-injected) L4 + L5 ventral roots following stimulation of the corresponding dorsal roots. A similar increase on the left side was observed in response to stimulation of descending motor tracts, suggesting that increased excitability of spinal motor neurones may at least partly explain the increased reflexes. However, significant changes were also observed in post-activation depression of the MSR suggesting that plastic changes in transmission from Ia afferent to the motor neurons may also be involved. The data demonstrate that muscle paralysis induced by Btx injection is accompanied by plastic adaptations in the central stretch reflex circuitry, which counteract the antispastic effect of Btx.
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Apple patents discreet 911 dialing technology
When alerted with the technology, responders would receive the phone's location as well as livestream video or audio
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SC EMT, patient hospitalized after ambulance crash
The ambulance was en route to the hospital with a patient at the time of the crash
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IAFC, PulsePoint announce partnership to increase cardiac arrest survival rates
The partnership aims to reinforce the use of a smartphone app to connect nearby CPR-trained citizens and off-duty responders with people in cardiac arrest
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Spinal anaesthesia in neonates and infants: what about the cerebral oxygen saturation?
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Viscoelastometric-guided early fibrinogen concentrate replacement during postpartum haemorrhage: OBS2, a double-blind randomized controlled trial
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Sevoflurane activates hippocampal CA3 kainate receptors (Gluk2) to induce hyperactivity during induction and recovery in a mouse model
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Randomized trial of near-infrared spectroscopy for personalized optimization of cerebral tissue oxygenation during cardiac surgery
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Predicting successful supraclavicular brachial plexus block using pulse oximeter perfusion index
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Lower-body negative pressure decreases noninvasively measured intracranial pressure and internal jugular vein cross-sectional area during head-down tilt
Long-term spaceflight induces a near visual acuity change in ~50% of astronauts. In some crew members, postflight cerebrospinal fluid (CSF) opening pressures by lumbar puncture are as high as 20.9 mmHg; these members demonstrated optic disc edema. CSF communicates through the cochlear aqueduct to affect perilymphatic pressure and tympanic membrane motion. We hypothesized that 50 mmHg of lower-body negative pressure (LBNP) during 15° head-down tilt (HDT) would mitigate elevations in internal jugular vein cross-sectional area (IJV CSA) and intracranial pressure (ICP). Fifteen healthy adult volunteers were positioned in sitting (5 min), supine (5 min), 15° HDT (5 min), and 15° HDT with LBNP (10 min) postures for data collection. Evoked tympanic membrane displacements (TMD) quantified ICP noninvasively. IJV CSA was measured using standard ultrasound techniques. ICP and IJV CSA increased significantly from the seated upright to the 15° HDT posture (P < 0.05), and LBNP mitigated these increases. LBNP at 25 mmHg reduced ICP during HDT (TMD of 322.13 ± 419.17 nl) to 232.38 ± 445.85 nl, and at 50 mmHg ICP was reduced further to TMD of 199.76 ± 429.69 nl. In addition, 50 mmHg LBNP significantly reduced IJV CSA (1.50 ± 0.33 cm2) during 15° HDT to 0.83 ± 0.42 cm2. LBNP counteracts the headward fluid shift elevation of ICP and IJV CSA experienced during microgravity as simulated by15° HDT. These data provide quantitative evidence that LBNP shifts cephalic fluid to the lower body, reducing IJV CSA and ICP.
NEW & NOTEWORTHY The current study provides new evidence that 25 or 50 mmHg of lower body negative pressure reduces jugular venous pooling and intracranial pressure during simulated microgravity. Therefore, spaceflight countermeasures that sequester fluid to the lower body may mitigate cephalic venous congestion and vision impairment.
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Influence of maximal fat oxidation on long-term weight loss maintenance in humans
Impaired maximal fat oxidation has been linked to obesity and weight regain after weight loss. The aim was to investigate the relationship between maximal fat oxidation (MFO) and long-term weight loss maintenance. Eighty subjects [means (SD): age, 36(13) yrs; BMI, 38(1) kg/m2] were recruited from a total of 2,420 former participants of an 11- to 12-wk lifestyle intervention. Three groups were established based on percent weight loss at follow-up [5.3(3.3) yr]: clinical weight loss maintenance (CWL), >10% weight loss; moderate weight loss (MWL), 1–10% weight loss; and weight regain (WR). Body composition (dual X-ray absorptiometry) and fat oxidation (indirect calorimetry) during incremental exercise were measured at follow-up. Blood and a muscle biopsy were sampled. At follow-up, a U-shaped parabolic relationship between MFO and percent weight loss was observed (r = 0.448; P < 0.001). Overall differences between CWL, MWL, and WR were observed in MFO (mean [95% confidence interval], in g/min, respectively: 0.46 [0.41–0.52]; 0.32 [0.27–0.38]; 0.45 [0.38–0.51]; P = 0.002), maximal oxygen uptake (Vo2max, in ml·min–1·FFM–1, respectively; 49 [46–51]; 43 [40–47]; 41 [39–44]; P = 0.007), HAD-activity (in µmol·g–1·min–1, respectively: 123 [113–133]; 104 [91–118]; 97 [88–105]; P < 0.001), muscle protein content of CD36 (in AU, respectively: 1.1 [1.0–1.2]; 0.9 [0.8–1.0]; 0.9 [0.8–0.9]; P = 0.008) and FABPpm (in AU, respectively, 1.0 [0.8–1.2]; 0.7 [0.5–0.8]; 0.7 [0.5–0.9]; P = 0.008), body fat (in %, respectively: 33 [29–38]; 42 [38–46]; 52 [49–55]; P < 0.001), and plasma triglycerides (in mM, respectively: 0.8 [0.7–1.0]; 1.3 [0.9–1.7]; 1.6 [1.0–2.1]; P = 0.013). CWL and WR both had higher MFO compared with MWL, but based on different mechanisms. CWL displayed higher Vo2max and intramuscular capacity for fat oxidation, whereas abundance of lipids at whole-body level and in plasma was higher in WR.
NEW & NOTEWORTHY Impaired maximal fat oxidation has been linked to obesity and weight regain after weight loss. Noteworthy, maximal fat oxidation was equally high after clinical weight loss maintenance and weight regain compared with moderate weight loss. A high maximal fat oxidation after clinical weight loss maintenance was related to higher maximal oxygen updake, content of key proteins involved in transport of lipids across the plasma membrane and β-oxidation. In contrast, a high maximal fat oxidation after weight regain was related to higher availability of lipids, i.e., general adiposity and plasma concentration of triglycerides.
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Obesity-induced discrepancy between contractile and metabolic phenotypes in slow- and fast-twitch skeletal muscles of female obese Zucker rats
A clear picture of skeletal muscle adaptations to obesity and related comorbidities remains elusive. This study describes fiber-type characteristics (size, proportions, and oxidative enzyme activity) in two typical hindlimb muscles with opposite structure and function in an animal model of genetic obesity. Lesser fiber diameter, fiber-type composition, and histochemical succinic dehydrogenase activity (an oxidative marker) of muscle fiber types were assessed in slow (soleus)- and fast (tibialis cranialis)-twitch muscles of obese Zucker rats and compared with age (16 wk)- and sex (females)-matched lean Zucker rats (n = 16/group). Muscle mass and lesser fiber diameter were lower in both muscle types of obese compared with lean animals even though body weights were increased in the obese cohort. A faster fiber-type phenotype also occurred in slow- and fast-twitch muscles of obese rats compared with lean rats. These adaptations were accompanied by a significant increment in histochemical succinic dehydrogenase activity of slow-twitch fibers in the soleus muscle and fast-twitch fiber types in the tibialis cranialis muscle. Obesity significantly increased plasma levels of proinflammatory cytokines but did not significantly affect protein levels of peroxisome proliferator-activated receptors PPAR or PGC1α in either muscle. These data demonstrate that, in female Zucker rats, obesity induces a reduction of muscle mass in which skeletal muscles show a diminished fiber size and a faster and more oxidative phenotype. It was noteworthy that this discrepancy in muscle's contractile and metabolic features was of comparable nature and extent in muscles with different fiber-type composition and antagonist functions.
NEW & NOTEWORTHY This study demonstrates a discrepancy between morphological (reduced muscle mass), contractile (shift toward a faster phenotype), and metabolic (increased mitochondrial oxidative enzyme activity) characteristics in skeletal muscles of female Zucker fatty rats. It is noteworthy that this inconsistency was comparable (in nature and extent) in muscles with different structure and function.
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Surgical Anti-Reflux Options Beyond Fundoplication
Abstract
Purpose of Review
This paper provides an overview of current and future surgical interventions available for the management of gastroesophageal reflux disease (GERD) beyond the well established and recognized fundoplication. Review the current indications and outcomes of these surgical procedures.
Recent Findings
Fundoplication has been a cornerstone of the surgical management of GERD. However, other effective surgical options exist and can be considered based on prior interventions as well as patient, anatomical or other factors. These options are intended to address some of the shortcomings or potential complications of fundoplication such as symptom recurrence, dysphagia, or gas bloating, for example.
Summary
Alternative procedures to fundoplication include magnetic sphincter augmentation, electrical stimulation and Roux-en-Y gastric bypass. The indication for surgical management remains failure of or inability to tolerate medical therapy.
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A tribute to Prof. Dr. Najet Belhadj
Publication date: June 2017
Source:Arab Journal of Gastroenterology, Volume 18, Issue 2
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Editorial Board
Publication date: June 2017
Source:Arab Journal of Gastroenterology, Volume 18, Issue 2
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Drug use and phylogenetic clustering of hepatitis C virus infection among people who use drugs in Vancouver, Canada: A latent class analysis approach
Journal of Viral Hepatitis
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New York attorney general says will sue over Obamacare repeal
Reuters Health News
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Diagnostic reliability of pediatric appendicitis score, ultrasound and low-dose computed tomography scan in children with suspected acute appendicitis
Therapeutics and Clinical Risk Management
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Ovarian cancer screening: harms still outweigh benefits, USPSTF says
Reuters Health News
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Relationship between uric acid and dehydration in children with gastroenteritis
Pediatrics International
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Vasectomy does not raise prostate cancer risk: study
Reuters Health News
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Association between nonalcoholic fatty liver disease and peripheral artery disease in patients with type 2 diabetes
Internal Medicine Journal
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Risk of postoperative complications among inflammatory bowel disease patients treated preoperatively with vedolizumab
The American Journal of Gastroenterology
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Long term effects: Galectin-1 and specific immunotherapy for allergic responses in the intestine
Allergy
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Innovative and collaborative approach to improve community access to hepatitis C therapy
The Journal for Nurse Practitioners
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Novel risk stratification for metachronous recurrence after curative endoscopic submucosal dissection for early gastric cancer
Gastrointestinal Endoscopy
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Tenofovir disoproxil fumarate significantly decreases serum lipoprotein levels compared with entecavir nucleos(t)ide analogue therapy in chronic hepatitis B carriers
Alimentary Pharmacology and Therapeutics
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Artificial sweeteners may not be risk free
Reuters Health News
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Risk of severe acute liver injury among patients with brain cancer treated with temozolomide: A nested case-control study using the healthcore integrated research database
Journal of Neuro-Oncology
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Botulinum toxin A as an adjunct to abdominal wall reconstruction for incisional hernia
Plastic and Reconstructive Surgery - Global Open
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Ten-day quadruple therapy comprising proton pump inhibitor, bismuth, tetracycline, and levofloxacin is more effective than standard levofloxacin triple therapy in the second-line treatment of helicobacter pylori infection: a randomized controlled trial
The American Journal of Gastroenterology
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Lactobacillus reuteri DSM 17938 and a placebo both significantly reduced symptoms in children with functional abdominal pain
Acta Pediatrica
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Early growth in children with coeliac disease: A cohort study
Archives of Diseases in Childhood
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Incidence, predictive factors, and impacts of acute kidney injury in cirrhotic patients hospitalized for cellulitis
Liver International
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Prophylactic therapy of cyclic vomiting syndrome in children: Comparison of amitriptyline and cyproheptadine: A randomized clinical trial
The American Journal of Gastroenterology
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Infant Positioning, Baby Gear Use, and Cranial Asymmetry
Abstract
Objectives This study aimed to identify predictors of cranial asymmetry. We hypothesize that among infants diagnosed with cranial asymmetry in the sampled region, there is an association between exposure to more time in baby gear and less awake time in prone and side-lying than in infants who do not present with this condition. Methods The study employed a cross sectional survey of caregivers of typically developing infants and infants diagnosed with cranial asymmetry. Results A mutivariable model reveals that caregivers of children who are diagnosed with cranial asymmetry report their children spending significantly less time in prone play than those children without a diagnosis of cranial asymmetry. Side-lying and time spent in baby gear did not attain statistical significance. Conclusions for Practice Occupational therapists, physical therapists, pediatricians, nurses and other health care professionals must provide parents with early education about the importance of varying positions and prone play in infancy and address fears and concerns that may serve as barriers to providing prone playtime.
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Moral Distress in Rehabilitation
About a dozen years ago, I took the lead on surveying clinical and nonclinical staff members at the Rehabilitation Institute of Chicago (now the Shirley Ryan AbilityLab) about their perceived moral distress [1]. My colleagues and I asked, "We are interested in learning about the issues that create a sense of moral distress in your daily professional life. What types of situations are troubling for you because of your beliefs about what is right and wrong? What is troubling to you because of conflicts of values?" The results were published in this Journal in 2009 and for many years the data guided the priorities and focus of our ethics initiatives.
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Academy News – July PM&R
As the primary medical society for the specialty of PM&R, your Academy is focused on moving the specialty and you forward. Academy membership supports initiatives to assist our members with:
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Immune Checkpoint Inhibitors in Organ Transplant Patients.
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