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Statistics and Nephrology

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263 papers 100 to 500 followers
By Isabel Acosta-Ochoa Nephrology senior staff. Valladolid. Spain
https://www.readbyqxmd.com/read/28892118/association-of-trial-registration-with-reporting-of-primary-outcomes-in-protocols-and-publications
#1
An-Wen Chan, Annukka Pello, Jessica Kitchen, Anna Axentiev, Jorma I Virtanen, Annie Liu, Elina Hemminki
No abstract text is available yet for this article.
September 11, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28858910/digital-pathology-in-nephrology-clinical-trials-research-and-pathology-practice
#2
Laura Barisoni, Jeffrey B Hodgin
PURPOSE OF REVIEW: In this review, we will discuss (i) how the recent advancements in digital technology and computational engineering are currently applied to nephropathology in the setting of clinical research, trials, and practice; (ii) the benefits of the new digital environment; (iii) how recognizing its challenges provides opportunities for transformation; and (iv) nephropathology in the upcoming era of kidney precision and predictive medicine. RECENT FINDINGS: Recent studies highlighted how new standardized protocols facilitate the harmonization of digital pathology database infrastructure and morphologic, morphometric, and computer-aided quantitative analyses...
August 30, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/28847909/considerations-and-challenges-in-selecting-patient-reported-outcome-measures-for-clinical-trials-in-nephrology
#3
Angela Ju, Allison Tong
No abstract text is available yet for this article.
August 28, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28697905/have-the-principles-of-experimental-medicine-become-obsolete-in-the-era-of-big-data
#4
Leon G Fine
No abstract text is available yet for this article.
July 8, 2017: Kidney International
https://www.readbyqxmd.com/read/28709600/challenges-in-conducting-clinical-trials-in-nephrology-conclusions-from-a-kidney-disease-improving-global-outcomes-kdigo-controversies-conference
#5
Colin Baigent, William G Herrington, Josef Coresh, Martin J Landray, Adeera Levin, Vlado Perkovic, Marc A Pfeffer, Peter Rossing, Michael Walsh, Christoph Wanner, David C Wheeler, Wolfgang C Winkelmayer, John J V McMurray
Despite the high costs of treatment of people with kidney disease and associated comorbid conditions, the amount of reliable information available to guide the care of such patients is very limited. Some treatments have been assessed in randomized trials, but most such trials have been too small to detect treatment effects of a magnitude that would be realistic to achieve with a single intervention. Therefore, KDIGO convened an international, multidisciplinary controversies conference titled "Challenges in the Conduct of Clinical Trials in Nephrology" to identify the key barriers to conducting trials in patients with kidney disease...
August 2017: Kidney International
https://www.readbyqxmd.com/read/28709606/prospective-studies-using-risk-scores-are-needed-for-established-associations-for-worse-clinical-outcomes
#6
LETTER
Andrew Bentall
No abstract text is available yet for this article.
August 2017: Kidney International
https://www.readbyqxmd.com/read/28818846/statistical-methods-for-modeling-time-updated-exposures-in-cohort-studies-of-chronic-kidney-disease
#7
Dawei Xie, Wei Yang, Christopher Jepson, Jason Roy, Jesse Y Hsu, Haochang Shou, Amanda H Anderson, J Richard Landis, Harold I Feldman
When estimating the effect of an exposure on a time-to-event type of outcome, one can focus on the baseline exposure or the time-updated exposures. Cox regression models can be used in both situations. When time-dependent confounding exists, the Cox model with time-updated covariates may produce biased effect estimates. Marginal structural models, estimated through inverse-probability weighting, were developed to appropriately adjust for time-dependent confounding. We review the concept of time-dependent confounding and illustrate the process of inverse-probability weighting...
August 17, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28751576/analytic-considerations-for-repeated-measures-of-egfr-in-cohort-studies-of-ckd
#8
Haochang Shou, Jesse Y Hsu, Dawei Xie, Wei Yang, Jason Roy, Amanda H Anderson, J Richard Landis, Harold I Feldman, Afshin Parsa, Christopher Jepson
Repeated measures of various biomarkers provide opportunities for us to enhance understanding of many important clinical aspects of CKD, including patterns of disease progression, rates of kidney function decline under different risk factors, and the degree of heterogeneity in disease manifestations across patients. However, because of unique features, such as correlations across visits and time dependency, these data must be appropriately handled using longitudinal data analysis methods. We provide a general overview of the characteristics of data collected in cohort studies and compare appropriate statistical methods for the analysis of longitudinal exposures and outcomes...
July 27, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28754551/the-fragility-of-significant-results-underscores-the-need-of-larger-randomized-controlled-trials-in-nephrology
#9
Lani R Shochet, Peter G Kerr, Kevan R Polkinghorne
The Fragility Index is a tool for testing robustness of randomized controlled trial results for dichotomous outcomes. It describes the minimum number of individuals in whom changing an event status would render a statistically significant result nonsignificant. Here we identified all randomized controlled trials in five nephrology and five general journals from 2005-2014. A total of 127 randomized controlled trials reporting at least one dichotomous statistically significant outcome (p less than 0.05) were included and the Fragility Index was calculated...
July 26, 2017: Kidney International
https://www.readbyqxmd.com/read/28738403/developing-consensus-based-priority-outcome-domains-for-trials-in-kidney-transplantation-a-multinational-delphi-survey-with-patients-caregivers-and-health-professionals
#10
MULTICENTER STUDY
Bénédicte Sautenet, Allison Tong, Karine E Manera, Jeremy R Chapman, Anthony N Warrens, David Rosenbloom, Germaine Wong, John Gill, Klemens Budde, Lionel Rostaing, Lorna Marson, Michelle A Josephson, Peter P Reese, Timothy L Pruett, Camilla S Hanson, Donal O'Donoghue, Helen Tam-Tham, Jean-Michel Halimi, Jenny I Shen, John Kanellis, John D Scandling, Kirsten Howard, Martin Howell, Nick Cross, Nicole Evangelidis, Philip Masson, Rainer Oberbauer, Samuel Fung, Shilpa Jesudason, Simon Knight, Sreedhar Mandayam, Stephen P McDonald, Steve Chadban, Tasleem Rajan, Jonathan C Craig
BACKGROUND: Inconsistencies in outcome reporting and frequent omission of patient-centered outcomes can diminish the value of trials in treatment decision making. We identified critically important outcome domains in kidney transplantation based on the shared priorities of patients/caregivers and health professionals. METHODS: In a 3-round Delphi survey, patients/caregivers and health professionals rated the importance of outcome domains for trials in kidney transplantation on a 9-point Likert scale and provided comments...
August 2017: Transplantation
https://www.readbyqxmd.com/read/28729382/recommended-clinical-trial-end-points-for-dialysis-catheters
#11
Michael Allon, Deborah J Brouwer-Maier, Kenneth Abreo, Kevin M Baskin, Kay Bregel, Deepa H Chand, Andrea M Easom, Leonard Mermel, Michele H Mokrzycki, Priti R Patel, Prabir Roy-Chaudhury, Surendra Shenoy, Rudolph P Valentini, Haimanot Wasse
Central venous catheters are used frequently in patients on hemodialysis as a bridge to a permanent vascular access. They are prone to frequent complications, including catheter-related bloodstream infection, catheter dysfunction, and central vein obstruction. There is a compelling need to develop new drugs or devices to prevent central venous catheter complications. We convened a multidisciplinary panel of experts to propose standardized definitions of catheter end points to guide the design of future clinical trials seeking approval from the Food and Drug Administration...
July 20, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28729383/definitions-and-end-points-for-interventional-studies-for-arteriovenous-dialysis-access
#12
Gerald A Beathard, Charmaine E Lok, Marc H Glickman, Ahmed A Al-Jaishi, Donna Bednarski, David L Cull, Jeffery H Lawson, Timmy C Lee, Vandana D Niyyar, Donna Syracuse, Scott O Trerotola, Prabir Roy-Chaudhury, Surendra Shenoy, Margo Underwood, Haimanot Wasse, Karen Woo, Theodore H Yuo, Thomas S Huber
This paper is part of the Clinical Trial Endpoints for Dialysis Vascular Access Project of the American Society of Nephrology Kidney Health Initiative. The purpose of this project is to promote research in vascular access by clarifying trial end points which would be best suited to inform decisions in those situations in which supportive clinical data are required. The focus of a portion of the project is directed toward arteriovenous access. There is a potential for interventional studies to be directed toward any of the events that may be associated with an arteriovenous access' evolution throughout its life cycle, which has been divided into five distinct phases...
July 20, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28727250/lack-of-adjustment-for-confounding-could-lead-to-misleading-conclusions
#13
EDITORIAL
S Christakoudi, M P Hernandez-Fuentes
No abstract text is available yet for this article.
July 20, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28716856/statistical-methods-for-recurrent-event-analysis-in-cohort-studies-of-ckd
#14
Wei Yang, Christopher Jepson, Dawei Xie, Jason A Roy, Haochang Shou, Jesse Yenchih Hsu, Amanda Hyre Anderson, J Richard Landis, Jiang He, Harold I Feldman
Cardiovascular events, such as hospitalizations because of congestive heart failure, often occur repeatedly in patients with CKD. Many studies focus on analyses of the first occurrence of these events, and discard subsequent information. In this article, we review a number of statistical methods for analyzing ordered recurrent events of the same type, including Poisson regression and three commonly used survival models that are extensions of Cox proportional hazards regression. We illustrate the models by analyzing data from the Chronic Renal Insufficiency Cohort Study to identify risk factors for congestive heart failure hospitalizations in patients with CKD...
July 17, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28707701/variable-selection-for-joint-models-of-multivariate-longitudinal-measurements-and-event-time-data
#15
Yuqi Chen, Yuedong Wang
Joint modeling of longitudinal and survival data has attracted a great deal of attention. Some research has been undertaken to extend the joint model to incorporate multivariate longitudinal measurements recently. However, there is a lack of variable selection methods in the joint modeling of multivariate longitudinal measurements and survival time. In this article, we develop penalized likelihood methods for the selection of longitudinal features in the survival submodel. A multivariate linear mixed effect model is used to model multiple longitudinal processes where random intercepts and slopes serve as essential features of the trajectories...
July 14, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28656892/clinical-trials-during-epidemics
#16
Gerald T Keusch, Keith P W J McAdam
No abstract text is available yet for this article.
June 24, 2017: Lancet
https://www.readbyqxmd.com/read/28586895/data-sharing-statements-for-clinical-trials-a-requirement-of-the-international-committee-of-medical-journal-editors
#17
EDITORIAL
Darren B Taichman, Peush Sahni, Anja Pinborg, Larry Peiperl, Christine Laine, Astrid James, Sung-Tae Hong, Abraham Haileamlak, Laragh Gollogly, Fiona Godlee, Frank A Frizelle, Fernando Florenzano, Jeffrey M Drazen, Howard Bauchner, Christopher Baethge, Joyce Backus
No abstract text is available yet for this article.
June 27, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28586883/adjustment-strategies-in-studies-of-therapy
#18
LETTER
Igor Karp
No abstract text is available yet for this article.
June 6, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28633144/standardized-renal-endpoints-for-perioperative-clinical-trials-the-standardized-endpoints-in-perioperative-medicine-initiative
#19
David R McIlroy, Andrew D Shaw, Paul S Myles
Perioperative acute kidney injury is a common problem. While clinical trials seek to evaluate the impact of interventions on a variety of primary and secondary endpoints with the aim of implementing this knowledge to improve perioperative outcomes, the use of valid and relevant endpoints within clinical trials is of critical importance to achieving this goal. Suitable endpoints must be validated for the study population and in light of the clinical context under investigation while also considering regulatory requirements that govern the licensing of new therapeutic agents as well as the values of patients whose outcomes we seek to improve...
June 21, 2017: Nephron
https://www.readbyqxmd.com/read/28586802/when-to-adjust-for-potentially-confounding-variables
#20
Johannes M Lehner
No abstract text is available yet for this article.
June 1, 2017: JAMA Internal Medicine
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