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Laboratory data prediction models

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https://www.readbyqxmd.com/read/28093683/simple-clinical-score-to-predict-24-week-survival-times-in-patients-with-inoperable-malignant-distal-biliary-obstruction-as-a-tool-for-selecting-palliative-metallic-or-plastic-stents
#1
Pimsiri Sripongpun, Siriboon Attasaranya, Naichaya Chamroonkul, Theerapong Sookpaisal, Uthai Khow-Ean, Aroon Siripun, Chanon Kongkamol, Teerha Piratvisuth, Bancha Ovartlarnporn
BACKGROUND AND AIM: Endoscopic biliary drainage (EBD) is the mainstay treatment for inoperable malignant distal biliary obstruction (MDBO). Some authorities suggest that metallic stents are more cost-effective than plastic stents in patients with expected survival of at least 6 months. However, studies attempting to define the predictive factors for such survival times are limited. This study aims to develop a scoring system for predicting a survival time of <24 weeks in these patients...
January 17, 2017: Journal of Gastrointestinal Cancer
https://www.readbyqxmd.com/read/28089433/derivation-and-validation-of-a-scoring-system-for-predicting-nonalcoholic-steatohepatitis-in-taiwanese-patients-with-severe-obesity
#2
Chi-Ming Tai, Ming-Lung Yu, Hung-Pin Tu, Chih-Kun Huang, Jau-Chung Hwang, Wan-Long Chuang
BACKGROUND: Nonalcoholic steatohepatitis (NASH) is common in severely obese Asians and may progress to advanced liver disease. Although invasive, liver biopsy is the gold standard for NASH diagnosis. Scoring systems for predicting NASH in obese Asians are scarce. OBJECTIVES: To develop and validate a scoring system to predict NASH in Taiwanese patients with severe obesity. SETTING: University hospital, Taiwan. METHODS: Preoperative clinical and laboratory data were obtained from 180 severely obese patients who underwent bariatric surgery...
December 7, 2016: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/28088411/standardization-of-milk-infrared-spectra-for-the-retroactive-application-of-calibration-models
#3
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/28086884/transfer-factor-for-carbon-monoxide-in-patients-with-copd-and-diabetes-results-from-the-german-cosyconet-cohort
#4
Kathrin Kahnert, Tanja Lucke, Frank Biertz, Andreas Lechner, Henrik Watz, Peter Alter, Robert Bals, Jürgen Behr, Rolf Holle, Rudolf M Huber, Stefan Karrasch, Beate Stubbe, Margarethe Wacker, Sandra Söhler, Emiel F M Wouters, Claus Vogelmeier, Rudolf A Jörres
BACKGROUND: An impairment of CO diffusing capacity has been shown in diabetic patients without lung disease. We analyzed how diffusing capacity in patients with COPD is affected by the concurrent diagnosis of diabetes. METHODS: Data from the initial visit of the German COPD cohort COSYCONET were used for analysis. 2575 patients with complete lung function data were included, among them 358 defined as diabetics with a reported physician diagnosis of diabetes and/or specific medication...
January 13, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28079718/longitudinal-hiv-care-trajectories-in-north-carolina
#5
Kimberly A Powers, Erika Samoff, Mark A Weaver, Lynne A Sampson, William C Miller, Peter A Leone, Heidi Swygard
BACKGROUND: Long-term HIV care and treatment engagement is required for maximal clinical and prevention benefits, but longitudinal care patterns are poorly understood. We used the last 10 years' worth of HIV surveillance data from North Carolina to describe longitudinal HIV care trajectories from diagnosis. METHODS: We conducted a retrospective, population-based cohort study of all persons newly diagnosed with HIV in North Carolina between March 31, 2006 and March 31, 2015 (N = 16,207)...
February 1, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28073843/active-estrogen-receptor-alpha-signaling-in-ovarian-cancer-models-and-clinical-specimens
#6
Courtney L Andersen, Matthew J Sikora, Michelle M Boisen, Tianzhou Ma, Alec Christie, George Tseng, Yong Seok Park, Soumya Luthra, Uma Chandran, Paul Haluska, Gina Mantia-Smaldone, Kunle Odunsi, Karen McLean, Adrian V Lee, Esther Elishaev, Robert P Edwards, Steffi Oesterreich
PURPOSE: High-grade serous ovarian cancer (HGSOC) is an aggressive disease with few available targeted therapies. Despite high expression of estrogen receptor-alpha in ~80% of HGSOC and some small but promising clinical trials of endocrine therapy, estrogen receptor-alpha has been understudied as a target in this disease. We sought to identify hormone-responsive, estrogen receptor-alpha-dependent HGSOC. EXPERIMENTAL DESIGN: We characterized endocrine response in HGSOC cells across culture conditions (2-D, 3-D, forced suspension) and in patient-derived xenograft (PDX) explants, assessing proliferation and gene expression...
January 10, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28065821/an-evaluation-of-the-utility-of-lvdp-dt40-qa-interval-lvdp-dtmin-and-tau-as-indicators-of-drug-induced-changes-in-contractility-and-lusitropy-in-dogs
#7
Michael K Pugsley, Brian Guth, Alan Y Chiang, Jennifer M Doyle, Michael Engwall, Jean-Michel Guillon, Peter K Hoffmann, John E Koerner, Scott W Mittelstadt, Jennifer Beck Pierson, Eric I Rossman, Dustan R Sarazan, Stanley T Parish
INTRODUCTION: The importance of drug-induced effects on the inotropic state of the heart is well known. Unlike hemodynamic and cardiac electrophysiological methods, which have been routinely used in drug safety testing for years, the non-clinical assessment of drug effects on myocardial contractility is used less frequently with no established translation to humans. The goal of these studies was to determine whether assessment of alternate measures of cardiac inotropy could detect drug-induced changes in the contractile state of the heart using drugs known to have clinically relevant positive and negative effects on myocardial contractility...
January 5, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28060934/a-cohort-study-of-adult-patients-with-severe-dengue-in-taiwanese-intensive-care-units-the-elderly-and-aptt-prolongation-matter-for-prognosis
#8
Chih-Cheng Hsieh, Cong-Tat Cia, Jen-Chieh Lee, Junne-Ming Sung, Nan-Yao Lee, Po-Lin Chen, Te-Hui Kuo, Jo-Yen Chao, Wen-Chien Ko
BACKGROUND: There was a large dengue outbreak in Taiwan in 2015, in which the ages of the affected individuals were higher than those in other countries. The aim of this study was to explore the characteristics and prognostic factors for adults with severe dengue in intensive care units (ICUs). METHODS: All adults admitted to ICUs with dengue virus infection (DENV) at a medical center from July 1, 2015 to December 31, 2015 were enrolled. DENV was diagnosed by the presence of serum NS1 antigen, IgM antibodies to dengue virus, or dengue virus RNA by real-time reverse transcriptase polymerase chain reaction...
January 6, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28054923/descriptive-longitudinal-study-results-applied-to-statistical-models-to-assess-the-impact-of-early-microbiological-cultures-on-the-economic-burden-of-treatment-for-infected-diabetic-foot-ulcers-at-a-mexican-public-health-facility
#9
Luz-Ma-Adriana Balderas-Peña, Daniel Sat-Muñoz, Rosa-Emilia Ramírez-Conchas, Moisés-Roberto Alvarado-Iñiguez, Javier-Eduardo García-de-Alba-García, Eduardo Cruz-Corona, José-Luis Chávez-Hurtado, José-Martín Chagollán-Ramírez
Infection plays a critical role in health care and impacts the cost of the treatment of diabetic foot ulcers (DFU). To examine the cost reduction associated with the multidisciplinary treatment of infected DFU (IDFU) by obtaining early (ie, within 48 hours of admission) microbiological culture results, a descriptive, longitudinal study was conducted. Data were collected prospectively from patient medical charts of a cohort of 67 patients (mean age, 56.14 ± 12.3 years; mean duration of diabetes, 14.95 ± 8 years) with IDFU treated at a Mexican public health facility from January 1 to April 30, 2010...
December 2016: Ostomy/wound Management
https://www.readbyqxmd.com/read/28052490/population-relevant-endpoints-in-the-evaluation-of-endocrine-active-substances-eas-for-ecotoxicological-hazard-and-risk-assessment
#10
Mary S Marty, Amy Blankinship, Janice Chambers, Lisa Constantine, Werner Kloas, Anupama Kumar, Laurent Lagadic, James Meador, Daniel Pickford, Tamar Schwarz, Tim Verslycke
For ecotoxicological risk assessment, endocrine disruptors require the establishment of an endocrine mode of action (MoA) with a plausible linkage to a population-relevant adverse effect. Current ecotoxicity test methods mostly incorporate apical endpoints although some also include mechanistic endpoints, subcellular-through-organ-level, which can help establish an endocrine MoA. However, the link between these endpoints and adverse population-level effects is often unclear. The case studies of endocrine-active substances (EAS) (tributyltin, ethinylestradiol, perchlorate, trenbolone, propiconazole, and vinclozolin) evaluated for the SETAC Pellston Workshop™: Environmental Hazard and Risk Assessment Approaches for Endocrine-Active Chemicals were used to evaluate the population relevance of toxicity endpoints in various taxa according to regulatory endocrine disruptor frameworks such as the OECD Conceptual Framework for Testing and Assessment of Endocrine Disruptors...
January 4, 2017: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/28049858/high-throughput-phenotyping-of-maize-leaf-physiological-and-biochemical-traits-using-hyperspectral-reflectance
#11
Craig R Yendrek, Tiago Tomaz, Christopher M Montes, Youyuan Cao, Alison M Morse, Patrick J Brown, Lauren M McIntyre, Andrew D B Leakey, Elizabeth A Ainsworth
High-throughput, noninvasive field phenotyping has revealed genetic variation in crop morphological, developmental, and agronomic traits, but rapid measurements of the underlying physiological and biochemical traits are needed to fully understand genetic variation in plant-environment interactions. This study tested the application of leaf hyperspectral reflectance (λ = 500-2,400 nm) as a high-throughput phenotyping approach for rapid and accurate assessment of leaf photosynthetic and biochemical traits in maize (Zea mays)...
January 2017: Plant Physiology
https://www.readbyqxmd.com/read/28041736/technical-note-methodological-and-feed-factors-affecting-prediction-of-ruminal-degradability-and-intestinal-digestibility-of-essential-amino-acids
#12
Robin R White, Paul J Kononoff, Jeffrey L Firkins
We hypothesized that ruminal degradability of essential AA (EAA) and the intestinal digestibility of the ruminally undegraded EAA residue in feeds could be evaluated in a meta-analysis. The objective was to characterize methodological factors for ruminal incubation (time of incubation of feed in situ) and method of simulating digestion of the ruminally undegraded AA (incubation of residue in digestive enzymes in vitro or in mobile bags inserted into the duodenum). To increase numbers of observations, feeds were categorized before ANOVA...
December 29, 2016: Journal of Dairy Science
https://www.readbyqxmd.com/read/28036324/stability-of-cross-feeding-polymorphisms-in-microbial-communities
#13
Ivana Gudelj, Margie Kinnersley, Peter Rashkov, Karen Schmidt, Frank Rosenzweig
Cross-feeding, a relationship wherein one organism consumes metabolites excreted by another, is a ubiquitous feature of natural and clinically-relevant microbial communities and could be a key factor promoting diversity in extreme and/or nutrient-poor environments. However, it remains unclear how readily cross-feeding interactions form, and therefore our ability to predict their emergence is limited. In this paper we developed a mathematical model parameterized using data from the biochemistry and ecology of an E...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/28029373/discharge-decision-making-after-complex-surgery-surgeon-behaviors-compared-to-predictive-modeling-to-reduce-surgical-readmissions
#14
Ira L Leeds, Vjollca Sadiraj, James C Cox, Xiaoxue Sherry Gao, Timothy M Pawlik, Kurt E Schnier, John F Sweeney
BACKGROUND: Little is known about how information available at discharge affects decision-making and its effect on readmission. We sought to define the association between information used for discharge and patients' subsequent risk of readmission. METHODS: 2009-2014 patients from a tertiary academic medical center's surgical services were analyzed using a time-to-event model to identify criteria that statistically explained the timing of discharges. The data were subsequently used to develop a time-varying prediction model of unplanned hospital readmissions...
October 20, 2016: American Journal of Surgery
https://www.readbyqxmd.com/read/28028140/comparative-evaluation-of-a-silicone-membrane-as-an-alternative-to-skin-for-testing-mosquito-repellents
#15
Natasha M Agramonte, Salvador A Gezan, Ulrich R Bernier
Repellents prevent mosquito bites and help reduce mosquito-borne disease, a global public health issue. Laboratory-based repellent bioassays predict the ability of compounds to deter mosquito feeding, but the variety of repellent bioassays and statistical analysis methods makes it difficult to compare results across methodologies. The most realistic data are collected when repellents are applied on the skin; however, this method exposes volunteers to chemicals and mosquito bites. Silicone membranes were investigated as an alternative to human skin in assays of repellent efficacy...
December 27, 2016: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28028082/a-variable-instar-climate-driven-individual-beetle-based-phenology-model-for-the-invasive-asian-longhorned-beetle-coleoptera-cerambycidae
#16
R Talbot Trotter, Melody A Keena
Efforts to manage and eradicate invasive species can benefit from an improved understanding of the physiology, biology, and behavior of the target species, and ongoing efforts to eradicate the Asian longhorned beetle (Anoplophora glabripennis Motschulsky) highlight the roles this information may play. Here, we present a climate-driven phenology model for A. glabripennis that provides simulated life-tables for populations of individual beetles under variable climatic conditions that takes into account the variable number of instars beetles may undergo as larvae...
December 2016: Environmental Entomology
https://www.readbyqxmd.com/read/28018986/a-roadmap-for-the-development-of-applied-computational-psychiatry
#17
Martin P Paulus, Quentin J M Huys, Tiago V Maia
BACKGROUND: Computational psychiatry is a burgeoning field that utilizes mathematical approaches to investigate psychiatric disorders, derive quantitative predictions, and integrate data across multiple levels of description. Computational psychiatry has already led to many new insights into the neurobehavioral mechanisms that underlie several psychiatric disorders, but its usefulness from a clinical standpoint is only now starting to be considered. METHODS: Examples of computational psychiatry are highlighted, and a phase-based pipeline for the development of clinical computational-psychiatry applications is proposed, similar to the phase-based pipeline used in drug development...
September 2016: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/28001220/predicting-death-from-kala-azar-construction-development-and-validation-of-a-score-set-and-accompanying-software
#18
Dorcas Lamounier Costa, Regina Lunardi Rocha, Eldo de Brito Ferreira Chaves, Vivianny Gonçalves de Vasconcelos Batista, Henrique Lamounier Costa, Carlos Henrique Nery Costa
INTRODUCTION: Early identification of patients at higher risk of progressing to severe disease and death is crucial for implementing therapeutic and preventive measures; this could reduce the morbidity and mortality from kala-azar. We describe a score set composed of four scales in addition to software for quick assessment of the probability of death from kala-azar at the point of care. METHODS: Data from 883 patients diagnosed between September 2005 and August 2008 were used to derive the score set, and data from 1,031 patients diagnosed between September 2008 and November 2013 were used to validate the models...
November 2016: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/27998276/methodological-challenges-to-multivariate-syndromic-surveillance-a-case-study-using-swiss-animal-health-data
#19
Flavie Vial, Wei Wei, Leonhard Held
BACKGROUND: In an era of ubiquitous electronic collection of animal health data, multivariate surveillance systems (which concurrently monitor several data streams) should have a greater probability of detecting disease events than univariate systems. However, despite their limitations, univariate aberration detection algorithms are used in most active syndromic surveillance (SyS) systems because of their ease of application and interpretation. On the other hand, a stochastic modelling-based approach to multivariate surveillance offers more flexibility, allowing for the retention of historical outbreaks, for overdispersion and for non-stationarity...
December 20, 2016: BMC Veterinary Research
https://www.readbyqxmd.com/read/27997297/predicting-tests-ordered-in-hospital-laboratories-using-generalized-linear-modeling
#20
Laquanda T Leaven
Laboratory services in healthcare systems play a vital role in inpatient care. Most hospital laboratories are facing the challenge of reducing cost and improving service quality. The author focuses on identifying test order patterns in a laboratory for a large urban hospital. The data collected from this facility consists of all tests ordered over a three-month time frame and contains test orders for approximately 17,500 patients. Poisson and negative binomial regression models are used to determine how well patient characteristics (patient length of stay and the medical units in which patients are placed) will predict the number of tests being ordered...
July 2016: Hospital Topics
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