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Measure GFR

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By Isabel Acosta-Ochoa Nephrology senior staff. Valladolid. Spain
https://www.readbyqxmd.com/read/28158649/measured-gfr-not-a-gold-but-a-gold-plated-standard
#1
Elise Boele-Schutte, Ron T Gansevoort
No abstract text is available yet for this article.
February 1, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28089986/estimating-glomerular-filtration-rate-for-the-full-age-spectrum-from-serum-creatinine-and-cystatin-c
#2
Hans Pottel, Pierre Delanaye, Elke Schaeffner, Laurence Dubourg, Bjørn Odvar Eriksen, Toralf Melsom, Edmund J Lamb, Andrew D Rule, Stephen T Turner, Richard J Glassock, Vandréa De Souza, Luciano Selistre, Karolien Goffin, Steven Pauwels, Christophe Mariat, Martin Flamant, Natalie Ebert
BACKGROUND: We recently published and validated the new serum creatinine (Scr)-based full-age-spectrum equation (FAScrea) for estimating the glomerular filtration rate (GFR) for healthy and kidney-diseased subjects of all ages. The equation was based on the concept of normalized Scr and shows equivalent to superior prediction performance to the currently recommended equations for children, adolescents, adults and older adults. METHODS: Based on an evaluation of the serum cystatin C (ScysC) distribution, we defined normalization constants for ScysC (QcysC = 0...
January 15, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28062677/filtration-markers-as-predictors-of-esrd-and-mortality-individual-participant-data-meta-analysis
#3
Lesley A Inker, Josef Coresh, Yingying Sang, Chi-Yuan Hsu, Meredith C Foster, John H Eckfeldt, Amy B Karger, Robert G Nelson, Xun Liu, Mark Sarnak, Lawrence J Appel, Morgan Grams, Dawei Xie, Paul L Kimmel, Harold Feldman, Vasan Ramachandran, Andrew S Levey
BACKGROUND AND OBJECTIVES: Serum β-trace protein (BTP) and β-2 microglobulin (B2M) are associated with risk of ESRD and death in the general population and in populations at high risk for these outcomes (GP/HR) and those with CKD, but results differ among studies. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We performed an individual patient-level meta-analysis including three GP/HR studies (n=17,903 participants) and three CKD studies (n=5415). We compared associations, risk prediction, and improvement in reclassification of eGFR using BTP (eGFRBTP) and B2M (eGFRB2M) alone and the average (eGFRavg) of eGFRBTP, eGFRB2M, creatinine (eGFRcr), and cystatin C (eGFRcys), to eGFRcr, eGFRcys, and their combination (eGFRcr-cys) for ESRD (2075 events) and death (7275 events)...
January 6, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28049448/international-collaboration-for-the-epidemiology-of-egfr-in-low-and-middle-income-populations-rationale-and-core-protocol-for-the-disadvantaged-populations-egfr-epidemiology-study-degree
#4
Ben Caplin, Kristina Jakobsson, Jason Glaser, Dorothea Nitsch, Vivekanand Jha, Ajay Singh, Ricardo Correa-Rotter, Neil Pearce
BACKGROUND: There is an increasing recognition of epidemics of primarily tubular-interstitial chronic kidney disease (CKD) clustering in agricultural communities in low- and middle-income countries (LMICs). Although it is currently unclear whether there is a unified underlying aetiology, these conditions have been collectively termed CKD of undetermined cause (CKDu). CKDu is estimated to have led to the premature deaths of tens to hundreds of thousands of young men and women over the last 2 decades...
January 3, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28035622/the-huge-formula-hematocrit-urea-gender-for-screening-for-chronic-kidney-disease-in-elderly-patients-a-study-of-diagnostic-accuracy
#5
Carlos G Musso, Eduardo de Los Rios, Manuel Vilas, Sergio Terrasa, Griselda Bratti, Federico Varela, Guillermo Rosa Diez, Jose Jauregui, Daniel Luna
Chronically reduced glomerular filtration rate (GFR) in old people does not always mean that they suffer from chronic kidney disease (CKD) since their GFR can just be reduced by aging. The HUGE equation has been recently described and validated in Spain for screening CKD without taking into account the patient's GFR value. This equation is based on patient's hematocrit, plasma urea levels and gender. The present study documented that the HUGE equation had and acceptable performance for screening CKD in elderly Argentine patients...
December 29, 2016: International Urology and Nephrology
https://www.readbyqxmd.com/read/27978513/an-overview-of-errors-and-flaws-of-estimated-gfr-versus-true-gfr-in-patients-with-diabetes-mellitus
#6
Sergio Luis-Lima, Esteban Porrini
The determination of renal function is crucial in patients with type 2 diabetes (T2DM), a population at risk for chronic kidney disease (CKD). Glomerular filtration rate (GFR) can be measured (mGFR) with gold standard methods or estimated (eGFR) with formulas. Since 1957, when Effersoe published the first formula, more than 50 equations have been developed to estimate GFR. In this review, we examined the studies that compared mGFR and eGFR in patients with T2DM to analyze the performance of those formulae in this population...
December 16, 2016: Nephron
https://www.readbyqxmd.com/read/27917582/agreement-between-chronic-kidney-disease-epidemiological-collaboration-and-berlin-initiative-study-equations-for-estimating-glomerular-filtration-rate-in-older-people-the-invecchiare-in-chianti-aging-in-chianti-region-study
#7
Andrea Corsonello, Claudio Pedone, Stefania Bandinelli, Luigi Ferrucci, Raffaele Antonelli Incalzi
AIM: The aim was to investigate to what extent chronic kidney disease (CKD) can be staged interchangeably by Chronic Kidney Disease Epidemiological Collaboration (CKD-EPI) and by Berlin Initiative Study (BIS) equations, and to verify whether cystatin C can improve concordance between formulas. METHODS: Our series consisted of 828 community-dwelling individuals aged 65 years or older enrolled in the Invecchiare in Chianti Study ("Aging in the Chianti Region"). Estimated glomerular filtration rate was calculated using the creatinine-based CKD-EPI, creatinine/cystatin C-based CKD-EPI, creatinine-based BIS and creatinine/cystatin C-based BIS equations...
December 5, 2016: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/27890838/preoperative-evaluation-of-the-renal-function-before-the-treatment-of-abdominal-aortic-aneurysms
#8
Raphael Coscas, Sandra Wagner, Eve Vilaine, Albane Sartorius, Isabelle Javerliat, Olivier Goeau-Brissonniere, Marc Coggia, Ziad Massy
OBJECTIVES: Chronic impaired renal function (IRC) constitutes a major risk factor of morbi-mortality during the treatment of an abdominal aortic aneurism (AAA). The inflammatory state due to the AAA could result in a reduction in the muscular mass and an over-estimation of the glomerular filtration rate (GFR) with the usual formulas. The objective of this study was to determine if the formulae used to evaluate the estimated GFR were adapted in patients with AAA. MATERIALS AND METHODS: Between August 2013 and November 2014, we conducted an exploratory study to evaluate the renal function before surgery for AAA in 28 patients...
November 24, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27894952/comparison-of-creatinine-and-cystatin-c-based-egfr-in-the-estimation-of-glomerular-filtration-rate-in-indigenous-australians-the-egfr-study
#9
Elizabeth Lm Barr, Louise J Maple-Brown, Federica Barzi, Jaquelyne T Hughes, George Jerums, Elif I Ekinci, Andrew G Ellis, Graham Rd Jones, Paul D Lawton, Cherian Sajiv, Sandawana W Majoni, Alex Dh Brown, Wendy E Hoy, Kerin O'Dea, Alan Cass, Richard J MacIsaac
BACKGROUND: The Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation that combines creatinine and cystatin C is superior to equations that include either measure alone in estimating glomerular filtration rate (GFR). However, whether cystatin C can provide any additional benefits in estimating GFR for Indigenous Australians, a population at high risk of end-stage kidney disease (ESKD) is unknown. METHODS: Using a cross-sectional analysis from the eGFR Study of 654 Indigenous Australians at high risk of ESKD, eGFR was calculated using the CKD-EPI equations for serum creatinine (eGFRcr), cystatin C (eGFRcysC) and combined creatinine and cystatin C (eGFRcysC+cr)...
November 25, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27876172/cystatin-c-versus-creatinine-for-gfr-estimation-in-ckd-due-to-heart-failure
#10
LETTER
Delphine Kervella, Sandrine Lemoine, Florence Sens, Laurence Dubourg, Laurent Sebbag, Fitsum Guebre-Egziabher, Eric Bonnefoy, Laurent Juillard
No abstract text is available yet for this article.
November 18, 2016: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/27884475/frailty-kidney-function-and-polypharmacy-the%C3%A2-atherosclerosis-risk-in-communities-aric-study
#11
Shoshana H Ballew, Yan Chen, Natalie R Daya, Job G Godino, B Gwen Windham, Mara McAdams-DeMarco, Josef Coresh, Elizabeth Selvin, Morgan E Grams
BACKGROUND: Frail individuals are at increased risk for poor outcomes, including adverse drug events. Kidney function is often compromised in frailty and is a key consideration in medication choice and dosing; however, creatinine-based measures of kidney function may be biased in frail individuals. STUDY DESIGN: Observational study. SETTING & PARTICIPANTS: 4,987 community-dwelling older men and women with complete data who participated in visit 5 of the Atherosclerosis Risk in Communities (ARIC) Study (2011-2013)...
February 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/27827312/interlaboratory-variability-in-plasma-creatinine-measurement-and-the-relation-with-estimated-glomerular-filtration-rate-and-chronic-kidney-disease-diagnosis
#12
Elizabeth Lee, Christine P Collier, Christine A White
BACKGROUND AND OBJECTIVES: The tracing of creatinine (Cr) reference materials to isotope dilution mass spectrometry-assigned values was implemented worldwide to reduce interlaboratory variability and improve assay accuracy. The aims of this study were to examine the current extent of interlaboratory variability and its effect on eGFR. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Leftover plasma from 2-3 consecutive days was obtained from 53 intensive care unit patients with a range of kidney functions...
January 6, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/27829460/renal-function-estimation-and-cockroft-gault-formulas-for-predicting-cardiovascular-mortality-in-population-based-cardiovascular-risk-heart-failure-and-post-myocardial-infarction-cohorts-the-heart-omics-in-ageing-homage-and-the-high-risk-myocardial-infarction
#13
João Pedro Ferreira, Nicolas Girerd, Pierpaolo Pellicori, Kevin Duarte, Sophie Girerd, Marc A Pfeffer, John J V McMurray, Bertram Pitt, Kenneth Dickstein, Lotte Jacobs, Jan A Staessen, Javed Butler, Roberto Latini, Serge Masson, Alexandre Mebazaa, Hans Peter Brunner-La Rocca, Christian Delles, Stephane Heymans, Naveed Sattar, J Wouter Jukema, John G Cleland, Faiez Zannad, Patrick Rossignol
BACKGROUND: Renal impairment is a major risk factor for mortality in various populations. Three formulas are frequently used to assess both glomerular filtration rate (eGFR) or creatinine clearance (CrCl) and mortality prediction: body surface area adjusted-Cockcroft-Gault (CG-BSA), Modification of Diet in Renal Disease Study (MDRD4), and the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation. The CKD-EPI is the most accurate eGFR estimator as compared to a "gold-standard"; however, which of the latter is the best formula to assess prognosis remains to be clarified...
November 10, 2016: BMC Medicine
https://www.readbyqxmd.com/read/27726196/evaluation-of-mdrd4-ckd-epi-bis-1-and-modified-cockcroft-gault-equations-to-estimate-glomerular-filtration-rate-in-the-elderly-renal-transplanted-recipients
#14
Elias David-Neto, Ana Heloisa Kamada Triboni, Fernanda Ramos, Fabiana Agena, Nelson Zocoler Galante, Marcelo Altona, Francine Brambate Carvalhinho Lemos, Marcelo Tatit Sapienza, William Carlos Nahas
Equations to estimate glomerular filtration rate (eGFR) were developed in patients using the variables age, body weight, and serum creatinine, which may be different in the elderly. Elderly renal transplant patients (EG; n=70; mean age 65 ± 4 y) who measured plasma (51) Cr-EDTA-Clearance (mGFR) had mGFR compared to eGFR obtained by the Cockcroft-Gault corrected by body surface area (CG-BSA), the modification of diet in renal disease (MDRD-4), the Berlin Initiative Study (BIS-1), and the chronic kidney disease epidemiology collaboration (CKD-EPI)...
December 2016: Clinical Transplantation
https://www.readbyqxmd.com/read/27679716/iohexol-plasma-clearance-for-measuring-glomerular-filtration-rate-in-clinical-practice-and-research-a-review-part-2-why-to-measure-glomerular-filtration-rate-with-iohexol
#15
Pierre Delanaye, Toralf Melsom, Natalie Ebert, Sten-Erik Bäck, Christophe Mariat, Etienne Cavalier, Jonas Björk, Anders Christensson, Ulf Nyman, Esteban Porrini, Giuseppe Remuzzi, Piero Ruggenenti, Elke Schaeffner, Inga Soveri, Gunnar Sterner, Bjørn Odvar Eriksen, Flavio Gaspari
A reliable assessment of glomerular filtration rate (GFR) is of paramount importance in clinical practice as well as epidemiological and clinical research settings. It is recommended by Kidney Disease: Improving Global Outcomes guidelines in specific populations (anorectic, cirrhotic, obese, renal and non-renal transplant patients) where estimation equations are unreliable. Measured GFR is the only valuable test to confirm or confute the status of chronic kidney disease (CKD), to evaluate the slope of renal function decay over time, to assess the suitability of living kidney donors and for dosing of potentially toxic medication with a narrow therapeutic index...
October 2016: Clinical Kidney Journal
https://www.readbyqxmd.com/read/27663042/non-gfr-determinants-of-low-molecular-weight-serum-protein%C3%A2-filtration-markers-in-ckd
#16
Xun Liu, Meredith C Foster, Hocine Tighiouart, Amanda H Anderson, Gerald J Beck, Gabriel Contreras, Josef Coresh, John H Eckfeldt, Harold I Feldman, Tom Greene, L Lee Hamm, Jiang He, Edward Horwitz, Julia Lewis, Ana C Ricardo, Haochang Shou, Raymond R Townsend, Matthew R Weir, Lesley A Inker, Andrew S Levey
BACKGROUND: Unlike the case with creatinine, conditions affecting the non-glomerular filtration rate (GFR) determinants of low-molecular-weight serum proteins, β-trace protein (BTP), β2-microglobulin (B2M), and cystatin C, are not well characterized. STUDY DESIGN: Pooled cross-sectional analysis of 3 studies. SETTING & PARTICIPANTS: 3,156 persons with chronic kidney disease from the MDRD (Modification of Diet in Renal Disease) Study, AASK (African American Study of Kidney Disease and Hypertension), and CRIC (Chronic Renal Insufficiency Cohort) Study...
December 2016: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/27647862/how-to-use%C3%A2-serum-creatinine-cystatin-c-and-gfr
#17
Swetha Pasala, J Bryan Carmody
Glomerular filtration rate (GFR) is the best overall measure of kidney function. The GFR is relatively low at birth but increases through infancy and early childhood to reach adult levels of approximately 120 mL/min/1.73 m(2) by age 2. While GFR can be measured most accurately by the urinary clearance of an exogenous ideal filtration marker such as inulin, it is more clinically useful to estimate GFR using a single serum measurement of an endogenous biomarker such as creatinine or cystatin C. When in steady state, there is an inverse relationship between creatinine/cystatin C and GFR, allowing GFR to be estimated from either using simple equations...
February 2017: Archives of Disease in Childhood. Education and Practice Edition
https://www.readbyqxmd.com/read/27489301/measurement-error-as-alternative-explanation-for-the-observation-that-crcl-gfr-ratio-is-higher-at-lower-gfr
#18
Xuehan Zhang, Charles E McCulloch, Feng Lin, Yen-Chung Lin, Isabel Elaine Allen, Nisha Bansal, Alan S Go, Chi-Yuan Hsu
BACKGROUND AND OBJECTIVES: Overestimation of GFR by urinary creatinine clearance (CrCl) at lower levels of GFR has long been attributed to enhanced creatinine secretion. However, this does not take into consideration the contribution of errors in measured GFR (and CrCl) due to short-term biologic variability or test imprecision. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We analyzed cross-sectional data among 1342 participants from the Chronic Renal Insufficiency Cohort study with baseline measurement of GFR by iothalamate clearance (iGFR) and CrCl by 24-hour urine collection...
September 7, 2016: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/27628290/an-innovative-non-invasive-model-for-screening-reduced-estimated-glomerular-filtration-rate-in-a-working-population
#19
Lan Wu, Vivian Yawei Guo, Carlos King Ho Wong, Kenny Kung, Li Han, XinLing Wang, Yunzhi Luo
BACKGROUND: Most of the existing risk scores for identifying people with reduced estimated glomerular filtration rate (eGFR) involve laboratory-based factors, which are not convenient and cost-effective to use in large population-based screening program. We aimed at using non-invasive variables to identify subjects with reduced eGFR in a Chinese working population. METHODS: Two study populations were recruited in 2012 and 2015, respectively. The 2012 study population (n = 14,374) was randomly separated as the training dataset (n = 9,621) or the internal testing dataset (n = 4,753) at a ratio of 2:1, and the 2015 study population (n = 4,371) was used as the external testing dataset...
September 14, 2016: Nephrology
https://www.readbyqxmd.com/read/27605583/the-gomez-equations-and-renal-hemodynamic-function-in-kidney-disease-research
#20
Petter Bjornstad, Marko Škrtić, Yuliya Lytvyn, David M Maahs, Richard J Johnson, David Z I Cherney
Diabetic kidney disease (DKD) remains the leading cause of end-stage renal disease. A major challenge in preventing DKD is the difficulty in identifying high-risk patients at an early, pre-clinical stage. Albuminuria and eGFR as measures of renal function in DKD research and clinical practice are limited by regression of one-third of patients with microalbuminuria to normoalbuminuria and eGFR is biased and imprecise in the normal-elevated range. Moreover, existing methods that are used to assess renal function do not give detailed insight into the location of the renal hemodynamic effects of pharmacological agents at the segmental level...
September 7, 2016: American Journal of Physiology. Renal Physiology
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