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https://www.readbyqxmd.com/read/28088843/evaluating-surrogate-marker-information-using-censored-data
#1
Layla Parast, Tianxi Cai, Lu Tian
Given the long follow-up periods that are often required for treatment or intervention studies, the potential to use surrogate markers to decrease the required follow-up time is a very attractive goal. However, previous studies have shown that using inadequate markers or making inappropriate assumptions about the relationship between the primary outcome and surrogate marker can lead to inaccurate conclusions regarding the treatment effect. Currently available methods for identifying and validating surrogate markers tend to rely on restrictive model assumptions and/or focus on uncensored outcomes...
January 15, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28088669/micro-mechanical-properties-of-the-tendon-to-bone-attachment
#2
Alix C Deymier, Yiran An, John J Boyle, Andrea G Schwartz, Victor Birman, Guy M Genin, Stavros Thomopoulos, Asa H Barber
: The tendon-to-bone attachment (enthesis) is a complex hierarchical tissue that connects stiff bone to compliant tendon. The attachment site at the micrometer scale exhibits gradients in mineral content and collagen orientation, which likely act to minimize stress concentrations. The physiological micromechanics of the attachment thus define resultant performance, but difficulties in sample preparation and mechanical testing at this scale have restricted understanding of structure-mechanical function...
January 11, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28088654/transcriptional-response-of-skeletal-muscle-to-a-low-protein-perinatal-diet-in-rat-offspring-at-different-ages-the-role-of-key-enzymes-of-glucose-fatty-acid-oxidation
#3
José Luiz de Brito Alves, Ana Elisa Toscano, João Henrique da Costa-Silva, Hubert Vidal, Carol Góis Leandro, Luciano Pirola
Skeletal muscle is a plastic tissue during development with distinctive acute and chronic response to maternal protein restriction. This study evaluated gene and protein expression of key-enzymes of glycolytic pathway (HK2, PFK, PDK4 and CS), and fatty acid oxidation (CPT1 and β-HAD) of two different types of skeletal muscle [soleus and extensor digitorium longus (EDL)] from offspring rats at 30 and 90 days of age, exposed to maternal isoenergetic low protein diet throughout gestation and lactation. Pups from dams fed 17% protein diet (n=5, normal protein, Np), and low protein pups from dams fed 8% casein diet (low protein, Lp, n=5) were evaluated...
December 15, 2016: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28088558/the-effects-of-upper-body-exercise-across-different-levels-of-blood-flow-restriction-on-arterial-occlusion-pressure-and-perceptual-responses
#4
Kevin T Mattocks, Matthew B Jessee, Brittany R Counts, Samuel L Buckner, J Grant Mouser, Scott J Dankel, Gilberto C Laurentino, Jeremy P Loenneke
Recent studies have investigated relative pressures that are applied during blood flow restriction exercise ranging from 40%-90% of resting arterial occlusion pressure; however, no studies have investigated relative pressures below 40% arterial occlusion pressure. The purpose of this study was to characterize the cardiovascular and perceptual responses to different levels of pressures. Twenty-six resistance trained participants performed four sets of unilateral elbow flexion exercise using 30% of their 1RM in combination with blood flow restriction inflated to one of six relative applied pressures (0%, 10%, 20%, 30%, 50%, 90% arterial occlusion pressure)...
January 11, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28088485/semantic-attributes-are-encoded-in-human-electrocorticographic-signals-during-visual-object-recognition
#5
Kyle Rupp, Matthew Roos, Griffin Milsap, Carlos Caceres, Christopher Ratto, Mark Chevillet, Nathan E Crone, Michael Wolmetz
Non-invasive neuroimaging studies have shown that semantic category and attribute information are encoded in neural population activity. Electrocorticography (ECoG) offers several advantages over non-invasive approaches, but the degree to which semantic attribute information is encoded in ECoG responses is not known. We recorded ECoG while patients named objects from 12 semantic categories and then trained high-dimensional encoding models to map semantic attributes to spectral-temporal features of the task-related neural responses...
January 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/28088474/diagnostic-accuracy-of-fractional-exhaled-nitric-oxide-in-predicting-cough-variant-asthma-and-eosinophilic-bronchitis-in-adult-patients-with-chronic-cough-a-systematic-review-and-meta-analysis
#6
Woo-Jung Song, Hyun Jung Kim, Ji-Su Shim, Ha-Kyeong Won, Sung-Yoon Kang, Kyoung-Hee Sohn, Byung-Keun Kim, Eun-Jung Jo, Min-Hye Kim, Sang-Heon Kim, Heung-Woo Park, Sun-Sin Kim, Yoon-Seok Chang, Alyn H Morice, Byung-Jae Lee, Sang-Heon Cho
BACKGROUND: Individual studies suggested the utility of fractional exhaled nitric oxide (FeNO) in detecting cough variant asthma (CVA) and eosinophilic bronchitis (EB) in chronic cough patients. OBJECTIVE: To obtain summary estimates of diagnostic test accuracy of FeNO in predicting CVA and/or EB in adult patients with chronic cough METHODS: Electronic databases were searched for studies published until January 2016, without language restriction. Cross-sectional studies which reported the diagnostic accuracy of FeNO for detecting CVA or EB were included...
January 11, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28088414/social-dominance-in-prepubertal-dairy-heifers-allocated-in-continuous-competitive-dyads-effects-on-body-growth-metabolic-status-and-reproductive-development
#7
C Fiol, M Carriquiry, R Ungerfeld
The objective of this study was to compare the body weight (BW) and size, metabolic status, and reproductive development of dominant and subordinate prepubertal dairy heifers allocated in competitive dyads. Sixteen Holstein and Jersey × Holstein prepubertal heifers (means ± SEM; 250.8 ± 9.8 d; 208.5 ± 13.9 kg of BW) were assigned to 8 homogeneous dyads according to breed, age, and BW. Dyads were housed in pens separated 1 m from each other during 120 d, receiving a total mixed ration on a 5% restriction of their potential dry matter intake, and had access to the same feeder (60 cm) throughout the experiment...
January 11, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28088411/standardization-of-milk-infrared-spectra-for-the-retroactive-application-of-calibration-models
#8
V Bonfatti, A Fleming, A Koeck, F Miglior
The objective of this study was to standardize the infrared spectra obtained over time and across 2 milk laboratories of Canada to create a uniform historical database and allow (1) the retroactive application of calibration models for prediction of fine milk composition; and (2) the direct use of spectral information for the development of indicators of animal health and efficiency. Spectral variation across laboratories and over time was inspected by principal components analysis (PCA). Shifts in the PCA scores were detected over time, leading to the definition of different subsets of spectra having homogeneous infrared signal...
January 11, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28088407/far-off-and-close-up-dry-matter-intake-modulate-indicators-of-immunometabolic-adaptations-to-lactation-in-subcutaneous-adipose-tissue-of-pasture-based-transition-dairy-cows
#9
M Vailati-Riboni, G Farina, F Batistel, A Heiser, M D Mitchell, M A Crookenden, C G Walker, J K Kay, S Meier, J R Roche, J J Loor
The common practice of increasing dietary energy density during the close-up dry period (last ∼3 wk prepartum) has been recently associated with a higher incidence of metabolic disorders after calving. Despite these reports, over-feeding of metabolizable energy (ME) during the far-off, nonlactating period is a common management policy aimed at achieving optimum calving body condition score (BCS) in pasture-based systems, as cows are generally thinner than total mixed ration cows at the end of lactation. Our hypothesis was that both far-off and close-up overfeeding influence the peripartum adipose tissue changes associated with energy balance and inflammatory state...
January 11, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28088349/stroke-biomarkers-in-clinical-practice-a-critical-appraisal
#10
REVIEW
Geelyn J L Ng, Amy M L Quek, Christine Cheung, Thiruma V Arumugam, Raymond C S Seet
Biomarkers provide critical mechanistic insights to key biologic processes that occur during cerebral ischemia which, when carefully applied, can improve clinical decision-making in acute stroke management. The translation of a blood-based biomarker in ischemic stroke to clinical practice is challenging, in part, due to the complexity of ischemic stroke pathogenesis and the presence of a blood-brain barrier that restricts the release of brain-specific markers into the circulation. The pathologic and clinical aspects of ischemic stroke are described in this review, where a non-exhaustive list of biomarkers that interrogate different aspects of ischemic stroke such as oxidative damage, inflammation, thrombus formation, cardiac function and brain injury are described...
January 11, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28088340/the-role-of-magnetic-resonance-imaging-techniques-in-evaluation-and-management-of-the-idiopathic-inflammatory-myopathies
#11
REVIEW
Jessica Day, Sandy Patel, Vidya Limaye
Magnetic resonance imaging (MRI) is an important tool in the evaluation of neuromuscular disorders. MRI accurately demonstrates muscle oedema, atrophy, subcutaneous pathology and fatty infiltration and also highlights the distribution of muscle involvement. This review examines the role of MRI in evaluation of the idiopathic inflammatory myopathies (IIMs), a heterogeneous group of autoimmune conditions characterised by muscle inflammation and a variety of extra-muscular manifestations. MRI has a clear role in aiding diagnosis of these conditions, guiding muscle biopsy, differentiating subtypes of IIM using a pattern-based approach, and monitoring disease activity in a longitudinal fashion...
November 5, 2016: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/28088247/first-molecular-identification-of-echinococcus-vogeli-and-echinococcus-granulosus-sensu-stricto-g1-revealed-in-feces-of-domestic-dogs-canis-familiaris-from-acre-brazil
#12
Leandro Batista das Neves, Paulo Eduardo Ferlini Teixeira, Sidnei Silva, Fernanda Bittencourt de Oliveira, Daniel Daipert Garcia, Fernanda Barbosa de Almeida, Rosângela Rodrigues-Silva, José Roberto Machado-Silva
BACKGROUND: Echinococcus granulosus (sensu lato) (s.l.) and Echinococcus vogeli are causative agents of chronic zoonotic diseases such as cystic and polycystic echinococcosis, respectively. In Brazil, polycystic echinococcosis has a restricted geographical distribution in the North Region, while cystic echinococcosis is observed in the South Region. Domestic dogs (Canis familiaris) fed with raw viscera represent a risk factor for E. granulosus (s.l.) infection in the South Region. Although this practice is frequent, it remains unclear whether domestic dogs are infected with E...
January 14, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28088244/study-of-the-variability-of-scapular-inclination-and-the-glenoid-version-considerations-for-preoperative-planning-clinical-radiological-study
#13
Petr Fulin, Martin Kysilko, David Pokorny, Radek Padr, Nikola Kasprikova, Ivan Landor, Antonin Sosna
BACKGROUND: Preoperative planning with the aid of imaging methods is a principal factor in successful surgery on the shoulder. This work aims to evaluate the variability of glenoid version, spiralling twist and scapular inclination in relation to the frontal axis. Studies focusing on measuring the variability of scapular inclination in the standardised rest position are lacking in the literature. METHODS: We evaluated 104 CT scans of the shoulder. We measured the glenoid version with respect to the scapular axis at three levels...
January 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28088148/lithium-ion-micrometer-diffusion-in-a-garnet-type-cubic-li7la3zr2o12-llzo-studied-using-7-li-nmr-spectroscopy
#14
Kikuko Hayamizu, Shiro Seki, Tomoyuki Haishi
Mobile lithium ions in a cubic garnet Li7La3Zr2O12 (Al-stabilized) were studied using (7)Li NMR spectroscopy for membrane and powder samples, the latter of which was ground from the membrane. Lithium diffusion in a micrometer space was measured using the pulsed-gradient spin-echo (7)Li NMR method between 70 and 130 °C. When the observation time (Δ) was shorter than 20 ms, the echo attenuation showed diffusive diffraction patterns, indicating that the Li(+) diffusing space is not free but restricted. For longer Δ, the values of apparent diffusion constant (Dapparent) became gradually smaller to approach an equilibrated value (close to a tracer diffusion constant)...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28088088/prevalence-of-new-psychoactive-substances-in-northeast-asia-from-2007-to-2015
#15
Junhui Lee, Songhee Yang, Yujin Kang, Eunyoung Han, Ling-Yi Feng, Jih-Heng Li, Heesun Chung
The proliferation of new psychoactive substances (NPS) has been a global trend in drug abuse and its regulation has been a worldwide concern. There is no doubt that it is necessary to share information related to these emerging substances between countries and continents for the effective regulation of NPS. With efforts for the efficient regulation of NPS, many studies and information have been published for the prevalence of NPS in the United States and other countries in Europe and Oceania. However, there is lack of information available for the prevalence of NPS in Asian and African countries...
October 20, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28088075/development-of-a-hypoxia-triggered-and-hypoxic-radiosensitized-liposome-as-a-doxorubicin-carrier-to-promote-synergetic-chemo-radio-therapy-for-glioma
#16
Hongmei Liu, Yandong Xie, Yafei Zhang, Yifan Cai, Baiyang Li, Honglin Mao, Yingguo Liu, Jun Lu, Longzhen Zhang, Rutong Yu
The treatment of malignant primary brain tumors is challenging. Concomitant radiochemotherapy has become the standard clinical treatment for malignant glioma, but there are two critical challenges to overcome in order to increase efficacy. First, glioma is known to have increased resistant to radiation due to its intra-tumoral hypoxia. In addition, the blood-brain barrier (BBB) restricts the distribution of the chemotherapeutic agent to the brain. Therefore, we developed a hypoxic radiosensitizer-prodrug liposome (MLP), in order to deliver DOX to the tumor and to overcome the above challenges, achieving a synergistic chemo-/radiotherapy treatment of malignant glioma...
January 3, 2017: Biomaterials
https://www.readbyqxmd.com/read/28088047/sliding-doors-did-drama-based-inter-professional-education-improve-the-tensions-round-person-centred-nursing-and-social-care-delivery-for-people-with-dementia-a-mixed-method-exploratory-study
#17
Lindsay Dingwall, Jane Fenton, Timothy B Kelly, John Lee
This educational intervention takes place when the population of older people with dementia is increasing. Health and Social care professionals must work jointly in increasingly complex contexts. Negative attitudes towards older people are cited as a contributor to poor care delivery, including the use of dismissive and/or patronising language, failing to meet fundamental needs and afford choice. 'Sliding Doors to Personal Futures' is a joint, drama-based, educational initiative between NHS Education Scotland and the Scottish Social Services Council, delivered using interprofessional education (IPE) towards encouraging person-centred health and social care...
December 21, 2016: Nurse Education Today
https://www.readbyqxmd.com/read/28088029/an-updated-meta-analysis-of-cohort-studies-diabetes-and-risk-of-alzheimer-s-disease
#18
REVIEW
Jieyu Zhang, Chunxiang Chen, Shuizhen Hua, Hairong Liao, Meixiang Wang, Yan Xiong, Fei Cao
BACKGROUND: In recently, several large longitudinal population-based studies have shown that the rate of cognitive decline is accelerated in elderly people with diabetes mellitus. But the relation between diabetes and AD is still an area of controversy. The objective of this review was to update the evidence for or against diabetes as a risk factor of AD. METHODS: We searched the literature from their inception to May 2016 without restriction of language. We included all longitudinal population-based studies examining the association between diabetes and risk of AD...
November 9, 2016: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28088027/an-alternative-strategy-to-western-blot-as-a-confirmatory-diagnostic-test-for-hiv-infection
#19
Xia Feng, Jibao Wang, Zhiyun Gao, Yu Tian, Ling Zhang, Huichao Chen, Tong Zhang, Lin Xiao, Jun Yao, Wenge Xing, Maofeng Qiu, Yan Jiang
BACKGROUND: In China, western blot (WB) is the recommended procedure for the diagnosis of HIV infection. However, this technique is time consuming and labor intensive, and its complexity restricts wide application in resource-limited regions. OBJECTIVE: The aim of this study was to evaluate the efficacy of a dry blood spots (DBS)-urine paired enzyme-linked immunosorbent assay (ELISA) test, instead of WB, for HIV antibody detection. STUDY DESIGN: Plasma, DBS, and urine samples were collected from 1213 subjects from different populations...
December 21, 2016: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28087911/-aortic-stiffness-and-its-influencing-factors-in-patients-with-chronic-kidney-disease
#20
Binxian Ye, Li Zhao, Wei Shen, Yan Ren, Bo Lin, Maosheng Chen, Junda Tang, Xinxin Jiang, Yiwen Li, Qiang He
Objective: To investigate the changes of aortic stiffness and its influencing factors in patients with chronic kidney diseases (CKD). Methods: Eightyfour patients with CKD from Department of Nephrology, Zhejiang Provincial People's Hospital were divided into the dialysis group (CKD stage 5, n=48) and non-dialysis group (CKD stage 3-5, n=36). Clinical data, biochemical parameters and echocardiography findings were collected. SphygmoCor pulse wave analysis system was used to obtain pulse wave analysis (PWA) parameters including central aortic systolic blood pressure (CSP), central pulse pressure (CPP), augmented pressure (AP), augmentation index (AIX), and heart rate 75-adjusted augmentation index (HR75AIX)...
May 25, 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
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