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https://www.readbyqxmd.com/read/28110508/on-an-enhanced-rank-preserving-structural-failure-time-model-to-handle-treatment-switch-crossover-and-dropout
#1
Lingling Li, Shijie Tang, Liewen Jiang
It is very challenging to estimate the comparative treatment effect between a treatment therapy and a control therapy on overall survival in the presence of treatment crossover, switch to an alternative non-study therapy, and non-random patient dropout. Existing methods (e.g., intent-to-treat and per-protocol) are known to be biased. We proposed two new estimators to address these analytical challenges and evaluated their performance via a comprehensive simulation study. The new estimators were constructed by combining an enhanced rank-preserving structural failure time model and the inverse probability censoring weighting approach...
January 22, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28110457/reduced-proliferation-and-colony-formation-of-head-and-neck-squamous-cell-carcinoma-hnscc-after-dual-targeting-of-egfr-and-hedgehog-pathways
#2
Hannes Liebig, Georg Günther, Marlen Kolb, Christian Mozet, Andreas Boehm, Andreas Dietz, Gunnar Wichmann
PURPOSE: The hedgehog signalling pathway (Hh) is frequently active in head and neck squamous cell carcinoma (HNSCC). Overexpressed Hh associates with poor prognosis. The Hh inhibitor vismodegib targets smoothened, and based on molecular data, may prevent resistance to EGFR targeting. METHODS: To elucidate potential roles of vismodegib in HNSCC therapy, its sole effects and those combined with cisplatin, docetaxel, and cetuximab on HNSCC cell lines were assessed by MTT metabolisation and BrdU incorporation...
January 21, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/28110450/application-of-a-statistical-model-for-the-assessment-of-environmental-quality-in-neotropical-semi-arid-reservoirs
#3
Evaldo de Lira Azevêdo, José Etham de Lucena Barbosa, Leandro Gomes Viana, Maria José Pinheiro Anacleto, Marcos Callisto, Joseline Molozzi
The aim of this study was to develop a statistical model to assess the environmental quality of reservoirs located in semi-arid region using metrics of anthropogenic disturbance, water quality variables, and benthic macroinvertebrate communities as indicators. The proposed model was applied to 60 sites located in three reservoirs in the Paraíba river basin, Brazilian semi-arid region. Collections were made in December 2011. In each site, we collected one sample of benthic macroinvertebrates and one water sample for the determination of physical and chemical parameters...
February 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28110386/an-optimization-protocol-for-swiss-3t3-feeder-cell-growth-arrest-by-mitomycin-c-dose-to-volume-derivation-strategy
#4
Rishi Man Chugh, Madhusudan Chaturvedi, Lakshmana Kumar Yerneni
Feeder cell functionality following growth-arrest with the cost-effective Mitomycin C vis-à-vis irradiation is controversial due to several methodological variables reported. Earlier, we demonstrated variability in growth arrested Swiss 3T3 feeder cell life-span following titration of feeder cell densities with Mitomycin C concentrations which led to the derivation of doses per cell. Alternatively, to counter the unexpected feeder regrowth at high exposure cell density, we proposed titration of a fixed density with arithmetically derived volumes of Mitomycin C solution that corresponded to permutations of specific concentrations and doses per cell...
January 21, 2017: Cytotechnology
https://www.readbyqxmd.com/read/28110382/economic-evaluations-alongside-efficient-study-designs-using-large-observational-datasets-the-pleasant-trial-case-study
#5
Matthew Franklin, Sarah Davis, Michelle Horspool, Wei Sun Kua, Steven Julious
BACKGROUND: Large observational datasets such as Clinical Practice Research Datalink (CPRD) provide opportunities to conduct clinical studies and economic evaluations with efficient designs. OBJECTIVES: Our objectives were to report the economic evaluation methodology for a cluster randomised controlled trial (RCT) of a UK NHS-delivered public health intervention for children with asthma that was evaluated using CPRD and describe the impact of this methodology on results...
January 21, 2017: PharmacoEconomics
https://www.readbyqxmd.com/read/28110380/iscev-standard-for-clinical-electro-oculography-2017-update
#6
Paul A Constable, Michael Bach, Laura J Frishman, Brett G Jeffrey, Anthony G Robson
The clinical electro-oculogram (EOG) is an electrophysiological test of the outer retina and retinal pigment epithelium (RPE) in which changes in the electrical potential across the RPE are recorded during successive periods of dark and light adaptation. This document presents the 2017 EOG Standard from the International Society for Clinical Electrophysiology of Vision (ISCEV: www.iscev.org ). This standard has been reorganized and updated to include an explanation of the mechanism of the EOG, but without substantive changes to the testing protocol from the previous version published in 2011...
January 21, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28110379/-they-are-talking-about-me-but-not-with-me-a-focus-group-study-to-explore-the-patient-perspective-on-interprofessional-team-meetings-in-primary-care
#7
Jerôme Jean Jacques van Dongen, Maarten de Wit, Hester Wilhelmina Henrica Smeets, Esther Stoffers, Marloes Amantia van Bokhoven, Ramon Daniëls
BACKGROUND: The number of people with multiple chronic conditions receiving primary care services is growing. To deal with their increasingly complex health care demands, professionals from different disciplines need to collaborate. Interprofessional team (IPT) meetings are becoming more popular. Several studies describe important factors related to conducting IPT meetings, mostly from a professional perspective. However, in the light of patient-centeredness, it is valuable to also explore the patients' perspective...
January 21, 2017: Patient
https://www.readbyqxmd.com/read/28110374/morphological-description-of-limbal-epithelium-searching-for-stem-cells-crypts-in-the-dog-cat-pig-cow-sheep-and-horse
#8
M Patruno, A Perazzi, T Martinello, A Blaseotto, E Di Iorio, I Iacopetti
The cornea provides protection and transparency to the eye, allowing an optimal sharpness view. In some pathological conditions the cornea is able to regenerate thanks to the presence of a stem cells reservoir present at the level of the transition area between cornea and sclera (limbus). Corneal cell therapies in Veterinary Medicine are really limited due to the lacking of knowledge about the anatomy of the limbal area, the putative presence of stem cells and their identification in domestic species. The aim of this study was to provide an overview of the main distinctive structural features of the sclero-corneal junction and conjunctival-corneal junction areas in some species of veterinary importance, using optic microscope observations of histological sections...
January 21, 2017: Veterinary Research Communications
https://www.readbyqxmd.com/read/28110355/venous-gas-emboli-are-involved-in-post-dive-macro-but-not-microvascular-dysfunction
#9
Kate Lambrechts, Costantino Balestra, Michaël Theron, Anne Henckes, Hubert Galinat, Fanny Mignant, Marc Belhomme, Jean-Michel Pontier, François Guerrero
PURPOSE: Previous studies have shown vascular dysfunction of main conductance arteries and microvessels after diving. We aim to evaluate the impact of bubble formation on vascular function and haemostasis. To achieve this, we used a vibration preconditioning to influence bubble levels without changing any other parameters linked to the dive. METHODS: Twentty-six divers were randomly assigned to one of three groups: (1) the "vibrations-dive" group (VD; n = 9) was exposed to a whole-body vibration session 30 min prior the dive; (2) the "diving" group (D; n = 9) served as a control for the effect of the diving protocol; (3) The "vibration" protocol (V; n = 8) allowed us to assess the effect of vibrations without diving...
January 21, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28110343/sex-related-cochlear-impairment-in-cigarette-smokers
#10
Grażyna Lisowska, Jerzy Jochem, Agata Gierlotka, Maciej Misiołek, Wojciech Ścierski
BACKGROUND A number of studies have documented the influence of cigarette smoking on hearing. However, the association between sex and hearing impairment in smokers as measured by otoacoustic emissions (OAEs) has not been clearly established. The aim of this study was to analyze sex-specific effects of smoking on hearing via conventional and ultra-high-frequency pure tone audiometry (PTA), and OAEs, specifically spontaneous OAEs, click-evoked OAEs, and distortion-product OAEs. MATERIAL AND METHODS The study included 84 healthy volunteers aged 25-45 years (mean 34), among them 46 women (25 non-smokers and 21 smokers) and 38 men (16 non-smokers and 22 smokers)...
January 22, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28110290/guided-and-unguided-internet-based-vestibular-rehabilitation-versus-usual-care-for-dizzy-adults-of-50%C3%A2-years-and-older-a-protocol-for-a-three-armed-randomised-trial
#11
Vincent A van Vugt, Johannes C van der Wouden, Judith E Bosmans, Martin Smalbrugge, Willianne van Diest, Rosie Essery, Lucy Yardley, Henriëtte E van der Horst, Otto R Maarsingh
INTRODUCTION: Dizziness is a common symptom in general practice with a high prevalence among older adults. The most common cause of dizziness in general practice is peripheral vestibular disease. Vestibular rehabilitation (VR) is a safe and effective treatment for peripheral vestibular disease that entails specific exercises to maximise the central nervous system compensation for the effects of vestibular pathology. An internet-based VR intervention has recently been shown to be safe and effective...
January 20, 2017: BMJ Open
https://www.readbyqxmd.com/read/28110287/aspirin-to-inhibit-sepsis-antisepsis-randomised-controlled-trial-protocol
#12
Damon P Eisen, Elizabeth M Moore, Karin Leder, Jessica Lockery, Emma S McBryde, John J McNeil, David Pilcher, Rory Wolfe, Robyn L Woods
INTRODUCTION: Sepsis is a leading global cause of morbidity and mortality, and is more common at the extremes of age. Moreover, the cost of in-hospital care for elderly patients with sepsis is significant. There are indications from experimental and observational studies that aspirin may reduce inflammation associated with infection. This paper describes the rationale and design of the AspiriN To Inhibit SEPSIS (ANTISEPSIS) trial, a substudy of ASPirin in Reducing Events in the Elderly (ASPREE)...
January 20, 2017: BMJ Open
https://www.readbyqxmd.com/read/28110285/validation-of-a-clinical-screening-instrument-for-tumour-predisposition-syndromes-in-patients-with-childhood-cancer-tups-protocol-for-a-prospective-observational-multicentre-study
#13
Floor A M Postema, Saskia M J Hopman, Corianne A J M de Borgie, Peter Hammond, Raoul C Hennekam, Johannes H M Merks, Cora M Aalfs, Jakob K Anninga, Lieke Pv Berger, Fonnet E Bleeker, Eveline Sjm de Bont, Corianne Ajm de Borgie, Charlotte J Dommering, Natasha Ka van Eijkelenburg, Peter Hammond, Raoul C Hennekam, Marry M van den Heuvel-Eibrink, Saskia Mj Hopman, Marjolijn Cj Jongmans, Wijnanda A Kors, Tom Gw Letteboer, Jan Lcm Loeffen, Johannes Hm Merks, Maran Jw Olderode-Berends, Floor Am Postema, Anja Wagner
INTRODUCTION: Recognising a tumour predisposition syndrome (TPS) in patients with childhood cancer is of significant clinical relevance, as it affects treatment, prognosis and facilitates genetic counselling. Previous studies revealed that only half of the known TPSs are recognised during standard paediatric cancer care. In current medical practice it is impossible to refer every patient with childhood cancer to a clinical geneticist, due to limited capacity for routine genetic consultation...
January 20, 2017: BMJ Open
https://www.readbyqxmd.com/read/28110259/ipsilateral-plaques-display-higher-t1-signals-than-contralateral-plaques-in-recently-symptomatic-patients-with-bilateral-carotid-intraplaque-hemorrhage
#14
Xianling Wang, Jie Sun, Xihai Zhao, Daniel S Hippe, Thomas S Hatsukami, Jin Liu, Rui Li, Gador Canton, Yan Song, Chun Yuan
BACKGROUND AND AIMS: Prospective studies have shown a strong association between carotid intraplaque hemorrhage (IPH), detected by magnetic resonance imaging (MRI), and cerebrovascular ischemic events. However, IPH is also observed in a substantial number of asymptomatic patients. We hypothesized that there are differences in the characteristics of IPH+ plaques associated with recent symptoms, compared to IPH+ plaques not associated with recent symptoms. METHODS: Patients with recent (≤2 weeks) anterior circulation ischemic events were scanned using a standardized multisequence protocol...
January 12, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28110136/impaired-muscle-force-production-and-higher-fatigability-in-a-mouse-model-of-sickle-cell-disease
#15
Benjamin Chatel, Christophe Hourdé, Julien Gondin, Alexandre Fouré, Yann Le Fur, Christophe Vilmen, Monique Bernard, Laurent A Messonnier, David Bendahan
Skeletal muscle function has been scarcely investigated in sickle cell disease (SCD) so that the corresponding impact of sickle hemoglobin is still a matter of debate. The purpose of this study was to investigate muscle force production and fatigability in SCD and to identify whether exercise intensity could have a modulatory effect. Ten homozygous sickle cell (HbSS), ten control (HbAA) and ten heterozygous (HbAS) mice were submitted to two stimulation protocols (moderate and intense) to assess force production and fatigability...
January 11, 2017: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28110053/development-and-optimization-of-an-in-vitro-cultivation-protocol-allows-for-isolation-of-borrelia-miyamotoi-from-patients-with-hard-tick-borne-relapsing-fever
#16
Joris Koetsveld, Nadezhda M Kolyasnikova, Alex Wagemakers, Marina G Toporkova, Denis S Sarksyan, Anneke Oei, Alexander E Platonov, Joppe W Hovius
OBJECTIVES: Borrelia miyamotoi has been shown to infect humans in Eurasia and North America causing hard tick-borne relapsing fever (HTBRF). In vitro cultivation of B. miyamotoi was described recently; however, clinical isolation of relapsing fever Borrelia is cumbersome. Our aim was to develop a straightforward protocol enabling B. miyamotoi isolation directly from blood of patients. METHODS: MKP-F media, with or without anticoagulants, or blood from healthy human volunteers, was spiked with B...
January 18, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28109962/endothelial-permeability-and-hemostasis-in-septic-shock-results-from-the-process-trial
#17
Peter Hou, Michael Filbin, Henry Wang, Long Ngo, David T Huang, William C Aird, Donald M Yealy, Derek C Angus, John A Kellum, Nathan I Shapiro
BACKGROUND: We studied patients from the Protocolized Care in Early Septic Shock (ProCESS) trial to determine: the effects of alternative resuscitation strategies on circulating markers of endothelial cell permeability and hemostasis, and; the association between biomarkers and mortality. METHODS: Prospective study of biomarkers of endothelial cell permeability (vegf, sflt-1, ang-2) and hemostasis (vwf, thrombomodulin, tpa) in 605 of the 1341 ProCESS participants in a derivation cohort and 305 in validation...
January 18, 2017: Chest
https://www.readbyqxmd.com/read/28109918/%C3%AE-ct-based-trabecular-anisotropy-can-be-reproducibly-computed-from-hr-pqct-scans-using-the-triangulated-bone-surface
#18
Hadi S Hosseini, Ghislain Maquer, Philippe K Zysset
The trabecular structure can be assessed at the wrist or tibia via high-resolution peripheral quantitative computed tomography (HR-pQCT). Yet on this modality, the performance of the existing methods, evaluating trabecular anisotropy is usually overlooked, especially in terms of reproducibility. We thus proposed to compare the TRI routine used by SCANCO Medical AG (Brüttisellen, Switzerland), the classical mean intercept length (MIL), and the grey-level structure tensor (GST) to the mean surface length (MSL), a new method for evaluating a second-order fabric tensor based on the triangulation of the bone surface...
January 18, 2017: Bone
https://www.readbyqxmd.com/read/28109888/improving-structural-brain-images-acquired-with-the-3d-flash-sequence
#19
Jinghua Wang, Lili He, Hairong Zheng, Zhong-Lin Lu
The three-dimension Fast Low Angle SHot Magnetic Resonance Imaging (3D FLASH) sequence has been widely adopted in medical diagnostic imaging because of its availability, simplicity, and high spatial resolution. To improve the quality of structural brain images acquired with the 3D FLASH sequence, we developed a parameter optimization scheme and image inhomogeneity correction methods. The optimal imaging parameters were determined by maximizing gray-matter and white-matter CNR efficiency. Compared to protocols based on published parameters, applying the proposed optimal imaging parameters increased CNR efficiency by >10%...
January 18, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28109820/how-does-the-size-of-gold-nanoparticles-depend-on-citrate-to-gold-ratio-in-turkevich-synthesis-final-answer-to-a-debated-question
#20
Li Shi, Eric Buhler, François Boué, Florent Carn
The dependence between the size of gold nanoparticle (AuNP) and the citrate to gold molar ratio (X) is still a matter of debate 65years after the seminal work by Turkevich et al. for high X values. We assume that this dispersion of results is due to the variation of certain parameters that are often not mentioned in the protocols, and to the use of a single characterization technique (dynamic light scattering (DLS) or transmission electron microscopy (TEM)). To adress definitely the question of this dependence, we have synthesized AuNPs with very precise protocols ensuring that the only parameters to be modified are X and the sequence of reagent addition...
October 25, 2016: Journal of Colloid and Interface Science
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