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https://www.readbyqxmd.com/read/28432505/3d-double-echo-steady-state-sequence-assessment-of-hip-joint-cartilage-and-labrum-at-3-tesla-comparative-analysis-of-magnetic-resonance-imaging-and-intraoperative-data
#1
Christoph Schleich, Tobias Hesper, Harish S Hosalkar, Fanni Rettegi, Christoph Zilkens, Rüdiger Krauspe, Gerald Antoch, Bernd Bittersohl
OBJECTIVES: To assess the diagnostic accuracy of a high-resolution, three-dimensional (3D) double-echo steady-state (DESS) sequence with radial imaging at 3 Tesla (T) for evaluating cartilage and labral alterations in the hip. METHODS: Magnetic resonance imaging (MRI) data obtained at 3 T, including radially reformatted DESS images and intraoperative data of 45 patients (mean age 42 ± 13.7 years) who underwent hip arthroscopy, were compared. The acetabular cartilage and labrum of the upper hemisphere of the acetabulum and the central femoral head cartilage were evaluated...
April 21, 2017: European Radiology
https://www.readbyqxmd.com/read/28431117/seeking-certainty-judicial-approaches-to-the-non-treatment-of-minimally-conscious-patients
#2
Richard Huxtable, Giles Birchley
A modest, but growing, body of case law is developing around the (non-)treatment of patients in the minimally conscious state. We sought to explore the approaches that the courts take to these decisions. Using the results of a qualitative analysis, we identify five key features of the rulings to date. First, the judges appear keen to frame the cases in such a way that these are rightly matters for judicial determination. Secondly, the judges appraise the types and forms of expertise that enter the courtroom, seeming to prefer the 'objective' and 'scientific', and particularly the views of the doctors...
April 18, 2017: Medical Law Review
https://www.readbyqxmd.com/read/28431109/performance-of-the-2015-acr-eular-classification-criteria-for-gout-in-a-primary-care-population-presenting-with-monoarthritis
#3
Hein J E M Janssens, Jaap Fransen, Matthijs Janssen, Tuhina Neogi, H Ralph Schumacher, Tim L Jansen, Nicola Dalbeth, William J Taylor
Objective.: To test the performance of the 2015 ACR-EULAR gout classification criteria against presence of SF MSU crystals in a primary healthcare population. Methods.: The criteria were applied to an existing dataset of consecutive patients with monoarthritis presenting to Dutch family physicians; all patients underwent microscopic SF analysis by design. The data had been prospectively collected to develop a diagnostic decision rule for gout in 2010. Diagnostic performance was assessed by calculating area under the receiver operating characteristic curve, sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and constructing calibration plots for the full version of the criteria (including SF analysis results of all patients) and the clinical-only version (not including SF analysis results)...
April 20, 2017: Rheumatology
https://www.readbyqxmd.com/read/28427319/mechanobiological-modelling-of-tendons-review-and-future-opportunities
#4
Mark S Thompson, M Nazri Bajuri, Hanifeh Khayyeri, Hanna Isaksson
Tendons are adapted to carry large, repeated loads and are clinically important for the maintenance of musculoskeletal health in an increasing, actively ageing population, as well as in elite athletes. Tendons are known to adapt to mechanical loading. Also, their healing and disease processes are highly sensitive to mechanical load. Computational modelling approaches developed to capture this mechanobiological adaptation in tendons and other tissues have successfully addressed many important scientific and clinical issues...
May 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28426763/individual-based-modelling-of-population-growth-and-diffusion-in-discrete-time
#5
Natalie Tkachenko, John D Weissmann, Wesley P Petersen, George Lake, Christoph P E Zollikofer, Simone Callegari
Individual-based models (IBMs) of human populations capture spatio-temporal dynamics using rules that govern the birth, behavior, and death of individuals. We explore a stochastic IBM of logistic growth-diffusion with constant time steps and independent, simultaneous actions of birth, death, and movement that approaches the Fisher-Kolmogorov model in the continuum limit. This model is well-suited to parallelization on high-performance computers. We explore its emergent properties with analytical approximations and numerical simulations in parameter ranges relevant to human population dynamics and ecology, and reproduce continuous-time results in the limit of small transition probabilities...
2017: PloS One
https://www.readbyqxmd.com/read/28426739/artificial-neural-network-and-sarima-based-models-for-power-load-forecasting-in-turkish-electricity-market
#6
Ömer Özgür Bozkurt, Göksel Biricik, Ziya Cihan Tayşi
Load information plays an important role in deregulated electricity markets, since it is the primary factor to make critical decisions on production planning, day-to-day operations, unit commitment and economic dispatch. Being able to predict the load for a short term, which covers one hour to a few days, equips power generation facilities and traders with an advantage. With the deregulation of electricity markets, a variety of short term load forecasting models are developed. Deregulation in Turkish Electricity Market has started in 2001 and liberalization is still in progress with rules being effective in its predefined schedule...
2017: PloS One
https://www.readbyqxmd.com/read/28425590/role-of-upper-gastrointestinal-contrast-studies-for-suspected-malrotation-in-neonatal-population
#7
Suresh Birajdar, Shripada C Rao, Fiona Bettenay
AIM: Upper gastrointestinal (UGI) contrast study is the preferred radiological investigation to diagnose malrotation of intestine. We aimed to review the role of UGI contrast in neonates (term and preterm) who were clinically suspected to have malrotation. METHODS: The study included a retrospective review of medical charts and radiology reports. RESULTS: A total of 164 newborn infants underwent UGI contrast study to rule out malrotation during the study period (2006-2015)...
April 20, 2017: Journal of Paediatrics and Child Health
https://www.readbyqxmd.com/read/28424342/individual-variation-in-local-interaction-rules-can-explain-emergent-patterns-of-spatial-organization-in-wild-baboons
#8
D R Farine, A Strandburg-Peshkin, I D Couzin, T Y Berger-Wolf, M C Crofoot
Researchers have long noted that individuals occupy consistent spatial positions within animal groups. However, an individual's position depends not only on its own behaviour, but also on the behaviour of others. Theoretical models of collective motion suggest that global patterns of spatial assortment can arise from individual variation in local interaction rules. However, this prediction remains untested. Using high-resolution GPS tracking of members of a wild baboon troop, we identify consistent inter-individual differences in within-group spatial positioning...
April 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28422065/detection-of-1-3-%C3%AE-d-glucan-for-the-diagnosis-of-invasive-fungal-infection-in-liver-transplant-recipients
#9
Eric Levesque, Fadi Rizk, Zaid Noorah, Nawel Aït-Ammar, Catherine Cordonnier-Jourdin, Sarra El Anbassi, Christine Bonnal, Daniel Azoulay, Jean-Claude Merle, Françoise Botterel
Invasive fungal infections (IFI) are complications after liver transplantation involving high morbidity and mortality. (1,3)-β-d-glucan (BG) is a biomarker for IFI, but its utility remains uncertain. This study was designed to evaluate the impact of BG following their diagnosis. Between January 2013 and May 2016, 271 liver transplants were performed in our institution. Serum samples were tested for BG (Fungitell(®), Associates Cape Code Inc., Falmouth, MA, USA) at least weekly between liver transplantation and the discharge of patients...
April 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28419606/stratified-polygenic-risk-prediction-model-with-application-to-cagi-bipolar-disorder-sequencing-data
#10
Maggie Haitian Wang, Billy Chang, Rui Sun, Inchi Hu, Xiaoxuan Xia, William Ka Kei Wu, Ka Chun Chong, Benny Chung-Ying Zee
Genetic data consists of a wide range of marker types, including common, low frequency, and rare variants. Multiple genetic markers and their interactions play central roles in the heritability of complex disease. In this study, we propose an algorithm that uses a stratified variable selection design by genetic architectures and interaction effects, achieved by a data-set adaptive W-test. The polygenic sets in all strata were integrated to form a classification rule. The algorithm was applied to the Critical Assessment of Genome Interpretation 4 bipolar challenge sequencing data...
April 17, 2017: Human Mutation
https://www.readbyqxmd.com/read/28419040/measurement-of-distal-ulnar-hounsfield-units-accurately-predicts-bone-mineral-density-of-the-forearm
#11
Scott C Wagner, Theodora C Dworak, Patrick D Grimm, George C Balazs, Scott M Tintle
BACKGROUND: Hounsfield unit (HU) measurement obtained from computed tomography (CT) scans of the wrist is a potential new screening method for low bone mineral density (BMD). We hypothesized that HU measurements of the ulnar head obtained from CT scans would correlate with BMD assessed with dual x-ray absorptiometry (DXA) scans of the forearm. METHODS: Patients with both upper-extremity CT and DXA scans performed at a single institution were included in the study...
April 19, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28412719/combined-measurement-of-factor-xiii-and-d-dimer-is-helpful-for-differential-diagnosis-in-patients-with-suspected-pulmonary-embolism
#12
Ning Tang, Ziyong Sun, Dengju Li, Jun Yang, Shiyu Yin, Qing Guan
BACKGROUND: D-dimer has been used to rule out pulmonary embolism (PE). Based on previous reports of decreased concentrations of coagulation factor XIII (FXIII) in venous thromboembolism, and no change in FXIII concentration in patients with acute cardiovascular disease, we evaluated the benefit of simultaneously measuring D-dimer and FXIII concentrations for diagnosing PE. METHODS: In this prospective single-center study, we enrolled 209 patients initially suspected of having PE, and measured their D-dimer and FXIII concentrations...
April 17, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28411289/evaluating-automated-rules-for-rapid-response-system-alarm-triggers-in-medical-and-surgical-patients
#13
Santiago Romero-Brufau, Bruce W Morlan, Matthew Johnson, Joel Hickman, Lisa L Kirkland, James M Naessens, Jeanne Huddleston
BACKGROUND: The use of rapid response systems (RRS), which were designed to bring clinicians with critical care expertise to the bedside to prevent unnecessary deaths, has increased. RRS rely on accurate detection of acute deterioration events. Early warning scores (EWS) have been used for this purpose but were developed using heterogeneous populations. Predictive performance may differ in medical vs surgical patients. OBJECTIVE: To evaluate the performance of published EWS in medical vs surgical patient populations...
April 2017: Journal of Hospital Medicine: An Official Publication of the Society of Hospital Medicine
https://www.readbyqxmd.com/read/28410792/accuracy-of-pecarn-catch-and-chalice-head-injury-decision-rules-in-children-a-prospective-cohort-study
#14
Franz E Babl, Meredith L Borland, Natalie Phillips, Amit Kochar, Sarah Dalton, Mary McCaskill, John A Cheek, Yuri Gilhotra, Jeremy Furyk, Jocelyn Neutze, Mark D Lyttle, Silvia Bressan, Susan Donath, Charlotte Molesworth, Kim Jachno, Brenton Ward, Amanda Williams, Amy Baylis, Louise Crowe, Ed Oakley, Stuart R Dalziel
BACKGROUND: Clinical decision rules can help to determine the need for CT imaging in children with head injuries. We aimed to validate three clinical decision rules (PECARN, CATCH, and CHALICE) in a large sample of children. METHODS: In this prospective observational study, we included children and adolescents (aged <18 years) with head injuries of any severity who presented to the emergency departments of ten Australian and New Zealand hospitals. We assessed the diagnostic accuracy of PECARN (stratified into children aged <2 years and ≥2 years), CATCH, and CHALICE in predicting each rule-specific outcome measure (clinically important traumatic brain injury [TBI], need for neurological intervention, and clinically significant intracranial injury, respectively)...
April 11, 2017: Lancet
https://www.readbyqxmd.com/read/28410715/comparison-of-astigmatic-prediction-errors-associated-with-new-calculation-methods-for-toric-intraocular-lenses
#15
Tiago B Ferreira, Paulo Ribeiro, Filomena J Ribeiro, João G O'Neill
PURPOSE: To compare the prediction errors in residual astigmatism associated with new calculation methods for toric intraocular lenses (IOLs). SETTING: Hospital da Luz, Lisbon, Portugal. DESIGN: Retrospective case series. METHODS: In eyes having cataract surgery with toric IOL implantation (Acrysof IQ), the predicted residual astigmatism by each calculation method was compared with the manifest refractive astigmatism...
March 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28410544/does-respiratory-variation-in-inferior-vena-cava-diameter-predict-fluid-responsiveness-a-systematic-review-and-meta-analysis
#16
Elliot Long, Ed Oakley, Trevor Duke, Franz E Babl
BACKGROUND: The aim of fluid resuscitation is to increase stroke volume, yet this effect is observed in only 50% of patients. Prediction of fluid responsiveness may allow fluid resuscitation to be administered to those most likely to benefit. The aim of this study was to systematically review the test characteristics of respiratory variation in inferior vena cava (IVC) diameter as a predictor of fluid responsiveness in patients with acute circulatory failure. METHODS: Electronic searches combined with reference review of identified studies...
May 2017: Shock
https://www.readbyqxmd.com/read/28410418/heterogeneous-firing-responses-predict-diverse-couplings-to-presynaptic-activity-in-mice-layer-v-pyramidal-neurons
#17
Yann Zerlaut, Alain Destexhe
In this study, we present a theoretical framework combining experimental characterizations and analytical calculus to capture the firing rate input-output properties of single neurons in the fluctuation-driven regime. Our framework consists of a two-step procedure to treat independently how the dendritic input translates into somatic fluctuation variables, and how the latter determine action potential firing. We use this framework to investigate the functional impact of the heterogeneity in firing responses found experimentally in young mice layer V pyramidal cells...
April 14, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28408412/fluid-intelligence-predicts-novel-rule-implementation-in-a-distributed-frontoparietal-control-network
#18
Nadja Tschentscher, Daniel Mitchell, John Duncan
Fluid intelligence has been associated with a distributed cognitive control or multiple-demand (MD) network, comprising regions of lateral frontal, insular, dorsomedial frontal and parietal cortex. Human fluid intelligence is also intimately linked to task complexity, and the process of solving complex problems in a sequence of simpler, more focused parts. Here, a complex target detection task included multiple independent rules, applied one at a time in successive task epochs. Though only one rule applied at a time, increasing task complexity (number of rules) impaired performance in participants of lower fluid intelligence...
April 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28407816/automatic-identification-of-variables-in-epidemiological-datasets-using-logic-regression
#19
Matthias W Lorenz, Negin Ashtiani Abdi, Frank Scheckenbach, Anja Pflug, Alpaslan Bülbül, Alberico L Catapano, Stefan Agewall, Marat Ezhov, Michiel L Bots, Stefan Kiechl, Andreas Orth
BACKGROUND: For an individual participant data (IPD) meta-analysis, multiple datasets must be transformed in a consistent format, e.g. using uniform variable names. When large numbers of datasets have to be processed, this can be a time-consuming and error-prone task. Automated or semi-automated identification of variables can help to reduce the workload and improve the data quality. For semi-automation high sensitivity in the recognition of matching variables is particularly important, because it allows creating software which for a target variable presents a choice of source variables, from which a user can choose the matching one, with only low risk of having missed a correct source variable...
April 13, 2017: BMC Medical Informatics and Decision Making
https://www.readbyqxmd.com/read/28407781/early-identification-of-patients-requiring-massive-transfusion-embolization-or-hemostatic-surgery-for-traumatic-hemorrhage-a-systematic-review-protocol
#20
Alexandre Tran, Maher Matar, Ewout W Steyerberg, Jacinthe Lampron, Monica Taljaard, Christian Vaillancourt
BACKGROUND: Hemorrhage is a major cause of early mortality following a traumatic injury. The progression and consequences of significant blood loss occur quickly as death from hemorrhagic shock or exsanguination often occurs within the first few hours. The mainstay of treatment therefore involves early identification of patients at risk for hemorrhagic shock in order to provide blood products and control of the bleeding source if necessary. The intended scope of this review is to identify and assess combinations of predictors informing therapeutic decision-making for clinicians during the initial trauma assessment...
April 13, 2017: Systematic Reviews
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