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https://www.readbyqxmd.com/read/29052956/meta-analysis-of-full-roc-curves-using-bivariate-time-to-event-models-for-interval-censored-data
#1
Annika Hoyer, Stefan Hirt, Oliver Kuss
Systematic reviews and meta-analyses are the cornerstones of evidence based medicine and inform treatment, diagnosis, or prevention of individual patients as well as policy decisions in health care. Statistical methods for the meta-analysis of intervention studies are well established today. Meta-analysis for diagnostic accuracy trials has also been a vivid research area in recent years which is especially due to the increased complexity of their bivariate outcome of sensitivity and specificity. The situation is even more challenging when single studies report a full ROC curve with several pairs of sensitivity and specificity, each pair for a different threshold...
October 20, 2017: Research Synthesis Methods
https://www.readbyqxmd.com/read/29052456/population-density-analysis-for-determining-the-protonation-state-of-the-catalytic-dyad-in-bace1-tertiary-carbinamine-based-inhibitor-complex
#2
Carlos Gueto-Tettay, Luis Pelaez-Bedoya, Juan Carlos Drosos-Ramirez
BACE1 is an aspartyl protease with a very relevant role in medicinal chemistry related to Alzheimer Disease since it has demonstrated to be a promising therapeutic target for inhibition and possible control for the progress of the peptide accumulation characteristic of this pathology. The enzymatic activity of this protein is given by the aspartic dyad, Asp93 and Asp289, which can adopt several protonation states depending on the chemical nature of its inhibitors, this is, monoprotonated, diprotonated and di-deprotonated states...
October 20, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29052267/t1-mapping-with-the-variable-flip-angle-technique-a-simple-correction-for-insufficient-spoiling-of-transverse-magnetization
#3
Simon Baudrexel, Ulrike Nöth, Jan-Rüdiger Schüre, Ralf Deichmann
PURPOSE: The variable flip angle method derives T1 maps from radiofrequency-spoiled gradient-echo data sets, acquired with different flip angles α. Because the method assumes validity of the Ernst equation, insufficient spoiling of transverse magnetization yields errors in T1 estimation, depending on the chosen radiofrequency-spoiling phase increment (Δϕ). This paper presents a versatile correction method that uses modified flip angles α' to restore the validity of the Ernst equation...
October 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29047177/selected-hepatoprotective-herbal-medicines-evidence-from-ethnomedicinal-applications-animal-models-and-possible-mechanism-of-actions
#4
REVIEW
Muhammad Ali, Tariq Khan, Kaneez Fatima, Qurat Ul Ain Ali, Muhammad Ovais, Ali Talha Khalil, Ikram Ullah, Abida Raza, Zabta Khan Shinwari, Muhammad Idrees
Insight into the hepatoprotective effects of medicinally important plants is important, both for physicians and researchers. Main reasons for the use of herbal medicine include their lesser cost compared with conventional drugs, lesser undesirable drug reactions and thus high safety, and reduced side effects. The present review focuses on the composition, pharmacology, and results of experimental trials of selected medicinal plants: Silybum marianum (L.) Gaertn., Glycyrrhiza glabra, Phyllanthus amarus Schumach...
October 19, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29047041/a-profound-computational-study-to-prioritize-the-disease-causing-mutations-in-prps1-gene
#5
Ashish Kumar Agrahari, P Sneha, C George Priya Doss, R Siva, Hatem Zayed
Charcot-Marie-Tooth disease (CMT) is one of the most commonly inherited congenital neurological disorders, affecting approximately 1 in 2500 in the US. About 80 genes were found to be in association with CMT. The phosphoribosyl pyrophosphate synthetase 1 (PRPS1) is an essential enzyme in the primary stage of de novo and salvage nucleotide synthesis. The mutations in the PRPS1 gene leads to X-linked Charcot-Marie-Tooth neuropathy type 5 (CMTX5), PRS super activity, Arts syndrome, X-linked deafness-1, breast cancer, and colorectal cancer...
October 18, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29045988/postgraduate-experiences-with-an-advanced-reproductive-health-and-abortion-training-and-leadership-program
#6
Alison Block, Christine Dehlendorf, M Antonia Biggs, Sarah McNeil, Suzan Goodman
BACKGROUND AND OBJECTIVES: Family physicians are critical to reproductive health service provision including miscarriage management and abortion care, but many graduates report barriers in integrating these services into practice. We designed and implemented CREATE (Continuing Reproductive Education for Advanced Training Efficacy), an elective advanced training and leadership program for senior residents aimed to help new graduates integrate miscarriage and abortion care into practice...
October 2017: Family Medicine
https://www.readbyqxmd.com/read/29044721/body-diffusion-weighted-imaging-using-magnetization-prepared-single-shot-fast-spin-echo-and-extended-parallel-imaging-signal-averaging
#7
Eric K Gibbons, Shreyas S Vasanawala, John M Pauly, Adam B Kerr
PURPOSE: This work demonstrates a magnetization prepared diffusion-weighted single-shot fast spin echo (SS-FSE) pulse sequence for the application of body imaging to improve robustness to geometric distortion. This work also proposes a scan averaging technique that is superior to magnitude averaging and is not subject to artifacts due to object phase. THEORY AND METHODS: This single-shot sequence is robust against violation of the Carr-Purcell-Meiboom-Gill (CPMG) condition...
October 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29042960/application-of-3d-printing-rapid-prototyping-assisted-percutaneous-fixation-in-the-treatment-of-intertrochanteric-fracture
#8
Sheng-Nai Zheng, Qing-Qiang Yao, Feng-Yong Mao, Peng-Fei Zheng, Shu-Chang Tian, Jia-Yi Li, Yi-Fan Yu, Shuai Liu, Jin Zhou, Jun Hu, Yan Xu, Kai Tang, Yue Lou, Li-Ming Wang
The aim of the present study was to investigate the application of 3D printing (3DP) rapid prototyping (RP) technique-assisted percutaneous fixation in the treatment of femoral intertrochanteric fracture (ITF) using proximal femoral nail anti-rotation (PFNA). A total of 39 patients with unstable ITF were included in the current study. Patients were divided into two groups: 19 patients were examined using computed tomography scanning and underwent PFNA with SDP-RP whereas the other 20 patients underwent conventional PFNA treatment...
October 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29042943/suxiao-jiuxin-pill-protects-cardiomyocytes-against-mitochondrial-injury-and-alters-gene-expression-during-ischemic-injury
#9
Xiaofen Ruan, Tiejun Chen, Xiaolong Wang, Yiping Li
Suxiao Jiuxin Pill (SX), a traditional Chinese medicine compound consisting primarily of tetramethylpyrazine and borneol, has been reported to protect against ischemic heart disease. However, the effects of SX on mitochondrial injury and gene expression in various signaling pathways are unclear. The aim of the present study was to investigate the effects of SX on mitochondrial injury and to screen the expression of genes potentially altered by SX using a cell culture model of ischemic injury. Simulated ischemia was established by culturing HL-1 cardiomyocytes in Dulbecco's modified Eagle medium without glucose or serum in a hypoxic chamber containing 95% N2 and 5% CO2 for 24 h...
October 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29042301/towards-a-first-implementation-of-the-wlimes-approach-in-living-system-studies-advancing-the-diagnostics-and-therapy-in-personalized-medicine
#10
Plamen L Simeonov, Andrée C Ehresmann
The goal of this paper is to advance an extensible theory of living systems using an approach to biomathematics and biocomputation that suitably addresses self-organized, self-referential and anticipatory systems with multi-temporal multi-agents. Our first step is to provide foundations for modelling of emergent and evolving dynamic multi-level organic complexes and their sustentative processes in artificial and natural life systems. Main applications are in life sciences, medicine, ecology and astrobiology, as well as robotics, industrial automation, man-machine interface and creative design...
October 14, 2017: Bio Systems
https://www.readbyqxmd.com/read/29040810/photothermal-nanoparticle-initiation-enables-radical-polymerization-and-yields-unique-uniform-microfibers-with-broad-spectrum-light
#11
Rachel C Steinhardt, Timothy Steeves, Brooke Marjorie Wallace, Brittany Moser, Dmitry A Fishman, Aaron P Esser-Kahn
Photothermal processes are utilized across a variety of fields, from separations to medicine, and are an area of active research. Herein, the action of a solar simulator upon carbon black nanoparticles is shown to result in photothermally-initiated chain-growth polymerization of methyl acrylate, butyl acrylate, and methyl methacrylate initiated by benzoyl peroxide. Using methyl acrylate as the model system, products from this reaction are shown to be apparently indistinguishable on the molecular level, but result in unique microstructures relative to the thermal controls...
October 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29040063/validation-of-the-six-sigma-z-score-for-the-quality-assessment-of-clinical-laboratory-timeliness
#12
Cristiano Ialongo, Sergio Bernardini
BACKGROUND: The International Federation of Clinical Chemistry and Laboratory Medicine has introduced in recent times the turnaround time (TAT) as mandatory quality indicator for the postanalytical phase. Classic TAT indicators, namely, average, median, 90th percentile and proportion of acceptable test (PAT), are in use since almost 40 years and to date represent the mainstay for gauging the laboratory timeliness. In this study, we investigated the performance of the Six Sigma Z-score, which was previously introduced as a device for the quantitative assessment of timeliness...
October 17, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/29037824/resource-usage-implementing-the-surgical-resident-prep-curriculum-at-a-single-institution
#13
Lily Owei, Chris Neylan, Rachel Kelz, Kristoffel R Dumon, Steve R Allen, Noel Williams, Daniel T Dempsey, Carla Fisher
OBJECTIVE: The Resident Prep Curriculum (RPC), published in 2014 and developed as a collaboration of the American College of Surgeons, Association of Program Directors in Surgery, and the Association for Surgical Education, was designed to improve the quality and consistency of medical student preparation for surgical residency. We aim to assess the feasibility of and resource usage for implementation of this curriculum at our institution. DESIGN: Our institution expanded upon a pre-existing 2-week surgical preparatory course, adding modules designed to meet the goals and objectives of the RPC...
October 13, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/29037213/personalized-treatment-of-women-with-early-breast-cancer-a-risk-group-specific-cost-effectiveness-analysis-of-adjuvant-chemotherapy-accounting-for-companion-prognostic-tests-oncotypedx-and-adjuvant-online
#14
Beate Jahn, Ursula Rochau, Christina Kurzthaler, Michael Hubalek, Rebecca Miksad, Gaby Sroczynski, Mike Paulden, Marvin Bundo, David Stenehjem, Diana Brixner, Murray Krahn, Uwe Siebert
BACKGROUND: Due to high survival rates and the relatively small benefit of adjuvant therapy, the application of personalized medicine (PM) through risk stratification is particularly beneficial in early breast cancer (BC) to avoid unnecessary harms from treatment. The new 21-gene assay (OncotypeDX, ODX) is a promising prognostic score for risk stratification that can be applied in conjunction with Adjuvant!Online (AO) to guide personalized chemotherapy decisions for early BC patients...
October 16, 2017: BMC Cancer
https://www.readbyqxmd.com/read/29036660/mcnpx-calculations-of-specific-absorbed-fractions-in-some-organs-of-the-human-body-due-to-application-of-133xe-99mtc-and-81mkr-radionuclides
#15
Z Jovanovic, D Krstic, D Nikezic, J M Gomez Ros, P Ferrari
Monte Carlo simulations were performed to evaluate treatment doses with wide spread used radionuclides 133Xe, 99mTc and 81mKr. These different radionuclides are used in perfusion or ventilation examinations in nuclear medicine and as indicators for cardiovascular and pulmonary diseases. The objective of this work was to estimate the specific absorbed fractions in surrounding organs and tissues, when these radionuclides are incorporated in the lungs. For this purpose a voxel thorax model has been developed and compared with the ORNL phantom...
September 23, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29035353/liquid-metal-organic-frameworks
#16
Romain Gaillac, Pluton Pullumbi, Kevin A Beyer, Karena W Chapman, David A Keen, Thomas D Bennett, François-Xavier Coudert
Metal-organic frameworks (MOFs) are a family of chemically diverse materials, with applications in a wide range of fields, covering engineering, physics, chemistry, biology and medicine. Until recently, research has focused almost entirely on crystalline structures, yet now a clear trend is emerging, shifting the emphasis onto disordered states, including 'defective by design' crystals, as well as amorphous phases such as glasses and gels. Here we introduce a strongly associated MOF liquid, obtained by melting a zeolitic imidazolate framework...
October 9, 2017: Nature Materials
https://www.readbyqxmd.com/read/29035083/multiplicity-adjusted-semiparametric-benefiting-subgroup-identification-in-clinical-trials
#17
Patrick M Schnell, Peter Müller, Qi Tang, Bradley P Carlin
Background A recent focus in the health sciences has been the development of personalized medicine, which includes determining the population for which a given treatment is effective. Due to limited data, identifying the true benefiting population is a challenging task. To tackle this difficulty, the credible subgroups approach provides a pair of bounding subgroups for the true benefiting subgroup, constructed so that one is contained by the benefiting subgroup while the other contains the benefiting subgroup with high probability...
October 1, 2017: Clinical Trials: Journal of the Society for Clinical Trials
https://www.readbyqxmd.com/read/29034770/association-with-polymorphic-marmoset-cytochrome-p450-2c19-of-in-vivo-hepatic-clearances-of-chirally-separated-r-omeprazole-and-s-warfarin-using-individual-marmoset-physiologically-based-pharmacokinetic-models
#18
Takashi Kusama, Akiko Toda, Makiko Shimizu, Shotaro Uehara, Takashi Inoue, Yasuhiro Uno, Masahiro Utoh, Erika Sasaki, Hiroshi Yamazaki
1. Simulated clearances of R-warfarin and efavirenz were recently reported for individual cynomolgus monkeys genotyped for cytochrome P450 2C19 and 2C9, respectively. To expand and verify this modeling procedure, simulations of R/S-omeprazole and R/S-warfarin clearances after oral administrations in individual marmosets were performed using individual simplified physiologically based pharmacokinetic (PBPK) modeling consisting of gut, liver, and central compartments. 2. Pharmacokinetics of R/S-omeprazole were chirally determined using the previously reported plasma microsamples in this study...
October 16, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/29034649/implementation-a-medical-simulation-curriculum-in-emergency-medicine-residency-program
#19
Amirhossein Jahanshir, Maryam Bahreini, Mohsen Banaie, Mohammad Jallili, Shahram Hariri, Fatemeh Rasooli, Hamed Sotoodehnia, Javad Seyed Hosseini, Arash Safaie, Ehsan Karimi, Ali Labaf, Hadi Mir Fazaelian, Elnaz Vahidi
Applying simulation in medical education is becoming more and more popular. The use of simulation in medical training has led to effective learning and safer care for patients. Nowadays educators have confronted with the challenge of respecting patient safety or bedside teaching. There is widespread evidence, supported by robust research, systematic reviews and meta-analysis, on how much effective simulation is. Simulation supports the acquisition of procedural, technical and non-technical skills through repetitive practice with feedbacks...
August 2017: Acta Medica Iranica
https://www.readbyqxmd.com/read/29032342/a-light-up-probe-targeting-for-bcl-2-2345-g-quadruplex-dna-with-carbazole-to
#20
Yingchun Gu, Dayong Lin, Yalin Tang, Xuening Fei, Cuihong Wang, Baolian Zhang, Jianguo Zhou
As its significant role, the selective recognition of G-quadruplex with specific structures and functions is important in biological and medicinal chemistry. Carbazole derivatives have been reported as a kind of fluorescent probe with many excellent optical properties. In the present study, the fluorescence of the dye (carbazole TO) increased almost 70 fold in the presence of bcl-2 2345 G4 compared to that alone in aqueous buffer condition with almost no fluorescence and 10-30 fold than those in the presence of other DNAs...
October 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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