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Integrated discrimination improvement

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https://www.readbyqxmd.com/read/29163839/prognostic-value-of-intratumoral-metabolic-heterogeneity-on-f-18-fluorodeoxyglucose-positron-emission-tomography-computed-tomography-in-locally-advanced-cervical-cancer-patients-treated-with-concurrent-chemoradiotherapy
#1
Gun Oh Chong, Won Kee Lee, Shin Young Jeong, Shin-Hyung Park, Yoon Hee Lee, Sang-Woo Lee, Dae Gy Hong, Jae-Chul Kim, Yoon Soon Lee
Objective: To evaluate the prognostic value for predicting tumor recurrence of intratumoral metabolic heterogeneity and traditional quantitative metabolic parameters on pre-treatment F-18-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) in patients with locally advanced cervical cancer treated with concurrent chemoradiotherapy (CCRT). Materials and Methods: Ninety-three patients with biopsy-proven cervical cancer and treated with CCRT (FIGO stage IIB-IV) were enrolled in this study...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29160558/simpson-s-paradox-in-the-integrated-discrimination-improvement
#2
J Chipman, D Braun
The integrated discrimination improvement (IDI) is commonly used to compare two risk prediction models; it summarizes the extent a new model increases risk in events and decreases risk in non-events. The IDI averages risks across events and non-events and is therefore susceptible to Simpson's paradox. In some settings, adding a predictive covariate to a well calibrated model results in an overall negative (positive) IDI. However, if stratified by that same covariate, the strata-specific IDIs are positive (negative)...
December 10, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/29160388/incremental-prognostic-value-of-the-incorporation-of-clinical-data-into-coronary-anatomy-data-in-acute-coronary-syndromes-syntax-grace-score
#3
Mateus Dos Santos Viana, Fernanda Lopes, Antonio Mauricio Dos Santos Cerqueira, Jessica Gonzalez Suerdieck, André Barcelos da Silva, Ana Clara Barcelos da Silva, Thiago Menezes Barbosa de Souza, Manuela Campelo Carvalhal, Marcia Maria Noya Rabelo, Luis Claudio Lemos Correia
BACKGROUND: When performing coronary angiography in patients with acute coronary syndrome (ACS), the anatomical extent of coronary disease usually prevails in the prognostic reasoning. It has not yet been proven if clinical data should be accounted for in risk stratification together with anatomical data. OBJECTIVE: To test the hypothesis that clinical data increment the prognostic value of anatomical data in patients with ACS. METHODS: Patients admitted with objective criteria for ACS and who underwent angiography during hospitalization were included...
November 13, 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/29156581/an-enhanced-non-coherent-pre-filter-design-for-tracking-error-estimation-in-gnss-receivers
#4
Zhibin Luo, Jicheng Ding, Lin Zhao, Mouyan Wu
Tracking error estimation is of great importance in global navigation satellite system (GNSS) receivers. Any inaccurate estimation for tracking error will decrease the signal tracking ability of signal tracking loops and the accuracies of position fixing, velocity determination, and timing. Tracking error estimation can be done by traditional discriminator, or Kalman filter-based pre-filter. The pre-filter can be divided into two categories: coherent and non-coherent. This paper focuses on the performance improvements of non-coherent pre-filter...
November 18, 2017: Sensors
https://www.readbyqxmd.com/read/29156504/clinical-risk-reclassification-at-10%C3%A2-years
#5
Nancy R Cook, Olga V Demler, Nina P Paynter
Three papers in this issue focus on the role of calibration in model fit statistics, including the net reclassification improvement (NRI) and integrated discrimination improvement (IDI). This commentary reviews the development of such reclassification statistics along with more recent advances in our understanding of these measures. We show how the two-category NRI and the IDI are affected by changes in the event rate in theory and in an applied example. We also describe the role of calibration and how it may be assessed...
December 10, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/29156501/event-rate-net-reclassification-index-and-the-integrated-discrimination-improvement-for-studying-incremental-value-of-risk-markers
#6
Maarten van Smeden, Karel G M Moons
No abstract text is available yet for this article.
December 10, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/29154147/selecting-the-minimum-data-set-and-quantitative-soil-quality-indexing-of-alkaline-soils-under-different-land-uses-in-northeastern-china
#7
Pujia Yu, Shiwei Liu, Liang Zhang, Qiang Li, Daowei Zhou
Understanding the influences of land use conversions on soil quality (SQ) and function are essential to adopt proper agricultural management practices for a specific region. The primary objective of this study was to develop soil quality indices (SQIs) to assess the short-term influences of different land uses on SQ in semiarid alkaline grassland in northeastern China. Land use treatments were corn cropland (Corn), alfalfa perennial forage (Alfalfa), monoculture Lyemus chinensis grassland (MG) and successional regrowth grassland (SRG), which were applied for five years...
November 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29152452/a-comparison-study-of-adaptive-scale-estimation-in-correlation-filter-based-visual-tracking-methods
#8
Z L Wang, B G Cai
Recently, discriminative correlation filter-based method becomes one of the popular directions in the field of visual tracking because of its computational efficiency and excellent performance, which make it especially suitable for real-time application. Most of them are focused only on the transition estimation. However, accurate scale estimation of the target plays a very important role in long-term tracking task and is still a challenging problem. The principle of CF-based visual tracking is introduced first...
2017: Robotics and Biomimetics
https://www.readbyqxmd.com/read/29148137/brain-computer-interfaces-with-multi-sensory-feedback-for-stroke-rehabilitation-a-case-study
#9
Danut C Irimia, Woosang Cho, Rupert Ortner, Brendan Z Allison, Bogdan E Ignat, Guenter Edlinger, Christoph Guger
Conventional therapies do not provide paralyzed patients with closed-loop sensorimotor integration for motor rehabilitation. This work presents the recoveriX system, a hardware and software platform that combines a motor imagery (MI)-based brain-computer interface (BCI), functional electrical stimulation (FES), and visual feedback technologies for a complete sensorimotor closed-loop therapy system for poststroke rehabilitation. The proposed system was tested on two chronic stroke patients in a clinical environment...
November 2017: Artificial Organs
https://www.readbyqxmd.com/read/29142010/value-of-progression-of-coronary-artery-calcification-for-risk-prediction-of-coronary-and-cardiovascular-events-result-of-the-heinz-nixdorf-recall-hnr-study
#10
Nils Lehmann, Raimund A Erbel, Amir A Mahabadi, Michael Rauwolf, Stefan Möhlenkamp, Susanne Moebus, Hagen Kälsch, Thomas Budde, Axel Schmermund, Andreas Stang, Dagmar Führer-Sakel, Christian Weimar, Ulla Roggenbuck, Nico Dragano, Karl-Heinz Jöckel
Background -Computed tomography (CT) allows estimation of coronary artery calcium (CAC) progression. We evaluated several progression algorithms in our unselected, population-based cohort for risk prediction of coronary and cardiovascular (CV) events. Methods -In 3281 participants (45-74 years), free from CV disease until the 2(nd) visit, risk factors and CTs at baseline (b) and after a mean of 5.1 years (5y) were measured. Hard coronary and cardiovascular events as well as total CV events including revascularization were recorded during a follow-up time of 7...
November 15, 2017: Circulation
https://www.readbyqxmd.com/read/29137838/fusion-of-fmri-and-non-imaging-data-for-adhd-classification
#11
Atif Riaz, Muhammad Asad, Eduardo Alonso, Greg Slabaugh
Resting state fMRI has emerged as a popular neuroimaging method for automated recognition and classification of different brain disorders. Attention Deficit Hyperactivity Disorder (ADHD) is one of the most common brain disorders affecting young children, yet its underlying mechanism is not completely understood and its diagnosis is mainly dependent on behavior analysis. This paper addresses the problem of classification of ADHD based on resting state fMRI and proposes a machine learning framework with integration of non-imaging data with imaging data to investigate functional connectivity alterations between ADHD and control subjects (not diagnosed with ADHD)...
October 19, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/29136443/derivation-and-external-validation-of-prediction-models-for-advanced-chronic-kidney-disease-following-acute-kidney-injury
#12
Matthew T James, Neesh Pannu, Brenda R Hemmelgarn, Peter C Austin, Zhi Tan, Eric McArthur, Braden J Manns, Marcello Tonelli, Ron Wald, Robert R Quinn, Pietro Ravani, Amit X Garg
Importance: Some patients will develop chronic kidney disease after a hospitalization with acute kidney injury; however, no risk-prediction tools have been developed to identify high-risk patients requiring follow-up. Objective: To derive and validate predictive models for progression of acute kidney injury to advanced chronic kidney disease. Design, Setting, and Participants: Data from 2 population-based cohorts of patients with a prehospitalization estimated glomerular filtration rate (eGFR) of more than 45 mL/min/1...
November 14, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29133364/day-by-day-variability-of-home-blood-pressure-and-incident-cardiovascular-disease-in-clinical-practice-the-j-hop-study-japan-morning-surge-home-blood-pressure
#13
Satoshi Hoshide, Yuichiro Yano, Hiroyuki Mizuno, Hiroshi Kanegae, Kazuomi Kario
We assessed the relationship between day-by-day home blood pressure (BP) variability and incident cardiovascular disease (CVD) in clinical practice. J-HOP study (Japan Morning Surge-Home Blood Pressure) participants underwent home BP monitoring in the morning and evening for a 14-day period, and their BP levels and BP variability independent of the mean (VIM) were assessed. Incident CVD events included coronary heart disease and stroke. Cox models were fitted to assess the home BP variability-CVD risk association...
November 13, 2017: Hypertension
https://www.readbyqxmd.com/read/29131804/assessing-the-performance-of-the-precise-dapt-and-paris-risk-scores-for-predicting-1-year-out-of-hospital-bleeding-in-acute-coronary-syndrome-patients
#14
Emad Abu-Assi, Sergio Raposeiras-Roubin, Rafael Cobas-Paz, Berenice Caneiro-Queija, Cristina Martínez-Reglero, José Manuel Rodríguez-Rodríguez, Antonio Baz, Andrés Íñiguez-Romo
AIMS: PRECISE-DAPT and PARIS risk scores (RSs) were recently developed to bleeding risk assessment in percutaneous coronary intervention (PCI) patients treated with dual antiplatelet therapy (DAPT). We aimed to assess the performance of these RSs at predicting out-of-hospital bleeding in patients with acute coronary syndrome (ACS). METHODS AND RESULTS:  Retrospectively, we studied 1926 consecutive ACS patients treated with PCI and DAPT. The performance of RSs for predicting one-year BARC type 2, 3 or 5 bleeding and BARC type 3 or 5 bleeding was assessed and compared...
November 14, 2017: EuroIntervention
https://www.readbyqxmd.com/read/29130072/prediction-of-chronic-kidney-disease-stage-3-by-ckd273-a-urinary-proteomic-biomarker
#15
Claudia Pontillo, Zhen-Yu Zhang, Joost P Schanstra, Lotte Jacobs, Petra Zürbig, Lutgarde Thijs, Adela Ramírez-Torres, Hiddo J L Heerspink, Morten Lindhardt, Ronald Klein, Trevor Orchard, Massimo Porta, Rudolf W Bilous, Nishi Charturvedi, Peter Rossing, Antonia Vlahou, Eva Schepers, Griet Glorieux, William Mullen, Christian Delles, Peter Verhamme, Raymond Vanholder, Jan A Staessen, Harald Mischak, Joachim Jankowski
Introduction: CKD273 is a urinary biomarker, which in advanced chronic kidney disease predicts further deterioration. We investigated whether CKD273 can also predict a decline of estimated glomerular filtration rate (eGFR) to <60 ml/min per 1.73 m(2). Methods: In analyses of 2087 individuals from 6 cohorts (46.4% women; 73.5% with diabetes; mean age, 46.1 years; eGFR ≥ 60 ml/min per 1.73 m(2), 100%; urinary albumin excretion rate [UAE] ≥20 μg/min, 6.2%), we accounted for cohort, sex, age, mean arterial pressure, diabetes, and eGFR at baseline and expressed associations per 1-SD increment in urinary biomarkers...
November 2017: KI Reports
https://www.readbyqxmd.com/read/29129262/biochemical-risk-markers-and-10-year-incidence-of-atherosclerotic-cardiovascular-disease-independent-predictors-improvement-in-pooled-cohort-equation-and-risk-reclassification
#16
Emmanuel Akintoye, Alexandros Briasoulis, Luis Afonso
BACKGROUND: The recommendation for statins in primary atherosclerotic cardiovascular disease (ASCVD) prevention begins with risk estimation using the pooled cohort equation (PCE). However, treatment decisions may still remain uncertain after PCE-based assessment. We therefore developed a simple biomarker score that could supplement decision making. METHODS: Using the prospectively collected database of the Multi-Ethnic Study of Atherosclerosis, we identified biochemical risk markers that independently predicted 10-year risk of ASCVD and developed an aggregate biomarker score based on them...
November 2017: American Heart Journal
https://www.readbyqxmd.com/read/29126311/value-of-biomarkers-for-predicting-immunoglobulin-a-vasculitis-nephritis-outcome-in-an-adult-prospective-cohort
#17
Laureline Berthelot, Agnès Jamin, Denis Viglietti, Jonathan M Chemouny, Hamza Ayari, Melissa Pierre, Pierre Housset, Virginia Sauvaget, Margarita Hurtado-Nedelec, François Vrtovsnik, Eric Daugas, Renato C Monteiro, Evangeline Pillebout
Background: Henoch-Schönlein purpura, more recently renamed immunoglobulin A vasculitis (IgAV), is a systemic vasculitis characterized by IgA deposits. The current markers used to assess IgAV inaccurately evaluate the risk of nephritis occurrence and its long-term outcomes. The current study assessed biomarkers of nephritis outcomes. Methods: This French multicentre prospective study enrolled 85 adult patients at the time of disease onset. Patients were assessed for clinical and biological parameters and re-examined after 1 year...
November 3, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/29122844/optimized-prognosis-assessment-in-st-segment-elevation-myocardial-infarction-using-a-cardiac-magnetic-resonance-imaging-risk-score
#18
Thomas Stiermaier, Alexander Jobs, Suzanne de Waha, Georg Fuernau, Janine Pöss, Steffen Desch, Holger Thiele, Ingo Eitel
BACKGROUND: Cardiac magnetic resonance (CMR) demonstrated great potential for the prediction of major adverse cardiac events (MACE) in ST-segment-elevation myocardial infarction. The aim of this study was to develop and validate a CMR-based risk score for ST-segment-elevation myocardial infarction patients. METHODS AND RESULTS: The scoring model was developed and validated on ST-segment-elevation myocardial infarction cohorts from 2 independent randomized controlled trials (n=738 and n=458 patients, respectively) and included left ventricular (LV) ejection fraction, infarct size, and microvascular obstruction...
November 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29121943/managing-intra-eu-mobility-do-who-principles-of-ethical-recruitment-have-relevance
#19
Réka Kovács, Edmond Girasek, Eszter Kovács, Zoltán Aszalós, Edit Eke, Károly Ragány, Zoltán Cserháti, Miklós Szócska
BACKGROUND: The WHO Global Code of Practice on the International Recruitment of Health Personnel provides for guidance in health workforce management and cooperation in the international context. This article aims to examine whether the principles of the voluntary WHO Global Code of Practice can be applied to trigger health policy decisions within the EU zone of free movement of persons. METHODS: In the framework of the Joint Action on European Health Workforce Planning and Forecasting project (Grant Agreement: JA EUHWF 20122201 (see healthworkforce...
November 9, 2017: Human Resources for Health
https://www.readbyqxmd.com/read/29116972/low-cardiac-output-syndrome-after-adult-cardiac-surgery-predictive-value-of-peak-systolic-global-longitudinal-strain
#20
Philippe Amabili, Sabeha Benbouchta, Laurence Roediger, Marc Senard, Marie Bernard Hubert, Anne-Françoise Donneau, Jean-François Brichant, Gregory A Hans
BACKGROUND: Peak systolic global longitudinal strain (GLS) is increasingly used to quantify left ventricular systolic function. The primary objective of this study was to assess whether GLS obtained during intraoperative transesophageal echocardiogram, performed before cardiopulmonary bypass, improves the prediction of postoperative low cardiac output syndrome (LCOS) after adult cardiac surgery. METHODS: GLS from 275 patients undergoing on-pump cardiac surgery was calculated retrospectively using two-dimensional- speckle tracking echocardiography (aCMQ module from Qlab software version 10...
November 7, 2017: Anesthesia and Analgesia
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