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Ishii S, Sugawara S, Tanaka Y, Kawamoto N, Hara J, Yamakuni R, Suenaga H, Fukushima K, Ito H. Impact of iodine contrast media on gamma camera-based GFR and factors affecting the difference between serum creatinine-based estimated GFR and Gate's GFR. Nucl Med Commun 2024:00006231-990000000-00286. [PMID: 38618748 DOI: 10.1097/mnm.0000000000001848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
OBJECTIVE We aimed to elucidate the factors underlying the difference between estimated glomerular filtration rate (eGFR) calculated from serum creatinine and Gate's GFR (gGFR) measured using technetium-99m diethylene triamine pentaacetic acid ( 99m Tc-DTPA) scintigraphy. METHODS This study was based on consecutive patients who underwent 99m Tc-DTPA scintigraphy at our hospital between January 2021 and December 2022 and whose blood serum creatinine data were obtained on the same day as the 99m Tc-DTPA scintigraphy. Relationships between the ratio of gGFR and eGFR (gGFR/eGFR) and age, sex, BMI, visceral fat, psoas muscle index (PMI), serum blood urea nitrogen, and creatinine level were investigated based on 75 patients. Additionally, for 44 patients who had two or more follow-up DTPA studies, we compared gGFR values for studies that used iodine contrast media (ICM) for computed tomography before same-day 99m Tc-DTPA studies and those that did not in the same patients. RESULTS Weak correlations were observed between gGFR/eGFR and PMI ( r = 0.30), BMI ( r = 0.24), and the visceral fat area ( r = 0.33). Multi-regression analyses showed that gGFR/eGFR was correlated with PMI ( β = 0.34, P < 0.01) and approached significance with the visceral fat area ( β = 0.24, P = 0.05). A significant difference was observed in gGFR between patients who received ICM before the 99m Tc-DTPA renogram and those who did not ( P < 0.001, eGFR 80.5 ± 19.0 vs. 91.7 ± 27.8 ml/min). CONCLUSION ICM administration temporarily decreased gGFR, and increased muscle mass increased the difference between eGFR and gGFR values.
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Affiliation(s)
- Shiro Ishii
- Department of Radiology, Fukushima Medical University, Fukushima, Japan
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2
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Krasauskaite J, Conway B, Weir C, Huang Z, Price J. Exploration of Metabolomic Markers Associated With Declining Kidney Function in People With Type 2 Diabetes Mellitus. J Endocr Soc 2023; 8:bvad166. [PMID: 38174155 PMCID: PMC10763986 DOI: 10.1210/jendso/bvad166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Indexed: 01/05/2024] Open
Abstract
Background Metabolomics, the study of small molecules in biological systems, can provide valuable insights into kidney dysfunction in people with type 2 diabetes mellitus (T2DM), but prospective studies are scarce. We investigated the association between metabolites and kidney function decline in people with T2DM. Methods The Edinburgh Type 2 Diabetes Study, a population-based cohort of 1066 men and women aged 60 to 75 years with T2DM. We measured 149 serum metabolites at baseline and investigated individual associations with baseline estimated glomerular filtration rate (eGFR), incident chronic kidney disease [CKD; eGFR <60 mL/min/(1.73 m)2], and decliner status (5% eGFR decline per year). Results At baseline, mean eGFR was 77.5 mL/min/(1.73 m)2 (n = 1058), and 216 individuals had evidence of CKD. Of those without CKD, 155 developed CKD over a median 7-year follow-up. Eighty-eight metabolites were significantly associated with baseline eGFR (β range -4.08 to 3.92; PFDR < 0.001). Very low density lipoproteins, triglycerides, amino acids (AAs), glycoprotein acetyls, and fatty acids showed inverse associations, while cholesterol and phospholipids in high-density lipoproteins exhibited positive associations. AA isoleucine, apolipoprotein A1, and total cholines were not only associated with baseline kidney measures (PFDR < 0.05) but also showed stable, nominally significant association with incident CKD and decline. Conclusion Our study revealed widespread changes within the metabolomic profile of CKD, particularly in lipoproteins and their lipid compounds. We identified a smaller number of individual metabolites that are specifically associated with kidney function decline. Replication studies are needed to confirm the longitudinal findings and explore if metabolic signals at baseline can predict kidney decline.
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Affiliation(s)
| | - Bryan Conway
- Centre for Cardiovascular Science, The Queen's Medical Research Institute, Edinburgh BioQuarter, University of Edinburgh, EH16 4TJ, Edinburgh, UK
| | - Christopher Weir
- Usher Institute, University of Edinburgh, EH8 9AG, Edinburgh, UK
| | - Zhe Huang
- Usher Institute, University of Edinburgh, EH8 9AG, Edinburgh, UK
| | - Jackie Price
- Usher Institute, University of Edinburgh, EH8 9AG, Edinburgh, UK
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3
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Lee SA, McMahon GM. A spurious elevation of serum creatinine level in a patient with Crohn's disease without histologic kidney damage: a case report and review of the literature. J Bras Nefrol 2023; 45:497-501. [PMID: 37930142 PMCID: PMC10726663 DOI: 10.1590/2175-8239-jbn-2023-0071en] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 08/22/2023] [Indexed: 11/07/2023] Open
Abstract
Patients with inflammatory bowel disease (IBD) are prone to develop kidney injury. Renal involvement in IBD patients is usually diagnosed by the measurement of serum creatinine and the estimation of the glomerular filtration rate. We describe a patient with IBD who presented with large fluctuations in his serum creatinine level (~3.0-fold) without significant histologic abnormalities and with a normal cystatin C level. This appears to be related to a high-protein diet and intermittent fasting. Even though the impact of a high-protein diet on mild elevations of the serum creatinine level has been described, large fluctuations in serum creatinine from diet alone, as seen in this case, have never been reported, raising the question about the potential contribution of inflamed bowel on gut absorption or metabolism of creatinine. This case highlights the importance of a detailed history, including the dietary habits, when encountering a patient with increased serum creatinine level, and careful interpretation of serum creatinine in a patient with a creatinine high-protein diet or underlying IBD.
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Affiliation(s)
- Sul A Lee
- Brigham and Women’s Hospital, Division of Nephrology, Boston, MA, USA
| | - Gearoid Michael McMahon
- Brigham and Women’s Hospital, Division of Nephrology, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
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4
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Świątek Ł, Jeske J, Miedziaszczyk M, Idasiak-Piechocka I. The impact of a vegetarian diet on chronic kidney disease (CKD) progression - a systematic review. BMC Nephrol 2023; 24:168. [PMID: 37308813 DOI: 10.1186/s12882-023-03233-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 06/06/2023] [Indexed: 06/14/2023] Open
Abstract
BACKGROUND A vegetarian diet is a popular alternative to the casual diet - it is considered healthy, and was proven to positively affect cardiovascular health. The Chronic Kidney Disease (CKD) progression is a major issue in the healthcare system, and constitutes a leading cause of death for 1.5% of the global population. The objective of this systematic review was to investigate the potential impact of a vegetarian diet on kidney function in CKD patients. METHOD Our systematic review focused on randomized controlled trials (RCTs) which compared the effects of a vegetarian diet (experimental) and a standard omnivore diet (comparator) in terms of the estimated glomerular filtration rate (eGFR) in CKD patients. Inclusion criteria were based on PICO elements, with two researchers involved in browsing the Cochrane and Pubmed search engines. The investigation was performed using the PRISMA 2020 Checklist and PRISMA 2020 flow diagram. The search terms included: 'vegetarian diet' AND 'nephropathy', 'eGFR', 'albuminuria', 'chronic kidney disease'. Bias assessment was performed using RoB 2 tool to determine the validity of the data collected from studies. RESULTS Four RCTs with a total of 346 participants were included in the presented systematic review. Two largest RCTs reported an increase in eGFR following a change to a vegetarian diet (p = 0.01 and p = 0.001). Another two found no significant differences between the experimental and control groups, also these trials were associated with a high risk of bias in terms of missing data outcome and the randomization process. CONCLUSIONS The findings collected in this systematic review suggest that a vegetarian diet improves renal filtration function in CKD patients. Therefore, it seems essential to conduct further research involving the impact of the diet on the progression of CKD.
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Affiliation(s)
- Łukasz Świątek
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland.
| | - Jan Jeske
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
| | - Miłosz Miedziaszczyk
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
| | - Ilona Idasiak-Piechocka
- Department of Nephrology, Transplantology and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
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5
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Abraham K, Penczynski K, Monien BH, Bergau N, Knüppel S, Weikert C. Risks of misinterpretation of biomarker measurements in spot urine adjusted for creatinine - A problem especially for studies comparing plant based with omnivorous diets. Int J Hyg Environ Health 2023; 249:114142. [PMID: 36842230 DOI: 10.1016/j.ijheh.2023.114142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 02/17/2023] [Accepted: 02/17/2023] [Indexed: 02/27/2023]
Abstract
Biomarker measurements in spot urine are often adjusted for creatinine to control for dilution resulting from individual hydration. We here report on results of a study involving age- and sex-matched vegans and omnivores (n = 36 each). The daily urinary excretion of 2,3-dihydroxypropylmercapturic acid (DHPMA, a diet-independent endogenous C3-metabolite used as an example compound) was found not to be different in vegans and omnivores (median 433 μg/24 h each), however, creatinine-adjusted levels were 26% lower in omnivores (median 285 μg/g creatinine) than in vegans (median 383 μg/g creatinine, p = 0.003). This difference results from the higher urinary excretion of creatinine in the omnivores compared to vegans (median 1.51 vs. 1.21 g/24 h, p = 0.009). Linear regression showed - besides the fat-free mass - a significant impact of the factor diet (vegans vs. omnivores). This may be due to the consumption of meat and fish as exogenous sources of creatinine. A literature search revealed broad evidence for this interpretation, as creatinine is formed from creatine during heating of meat and fish. Accordingly, consumption leads to temporary increase of serum/plasma creatinine and urinary creatinine excretion, resulting in higher levels in omnivores compared to vegans/vegetarians. An adjustment of the urinary DHPMA concentrations using specific gravity revealed 13% lower values in omnivores (median 225 μg/L) than in vegans (median 260 μg/L, p = 0.07). Compared to creatinine-adjustment, adjustment for specific gravity introduces a smaller but still obvious difference between omnivores and vegans. Especially with respect to future studies comparing vegans, vegetarians and omnivores, researchers should be aware of the risks of severe misinterpretations if biomarker measurements in spot urine are adjusted for creatinine.
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Affiliation(s)
- Klaus Abraham
- German Federal Institute for Risk Assessment, Department Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany.
| | - Katharina Penczynski
- German Federal Institute for Risk Assessment, Department Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Bernhard H Monien
- German Federal Institute for Risk Assessment, Department Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Nick Bergau
- German Federal Institute for Risk Assessment, Department Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Sven Knüppel
- German Federal Institute for Risk Assessment, Department Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Cornelia Weikert
- German Federal Institute for Risk Assessment, Department Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
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Stehlé T, Morel A, Ouamri Y, Pigneur F. Comment on 'Allograft function and muscle mass evolution after kidney transplantation' by Gaillard et al. J Cachexia Sarcopenia Muscle 2023; 14:1139-1141. [PMID: 36869595 PMCID: PMC10067480 DOI: 10.1002/jcsm.13203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/05/2023] Open
Affiliation(s)
- Thomas Stehlé
- Univ Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Institut Mondor de Recherche Biomédicale (IMRB), Créteil, France.,Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri Mondor, Service de Néphrologie et Transplantation, Fédération Hospitalo-Universitaire "Innovative Therapy for Immune Disorders", Créteil, France
| | - Antoine Morel
- Univ Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Institut Mondor de Recherche Biomédicale (IMRB), Créteil, France.,Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri Mondor, Service de Néphrologie et Transplantation, Fédération Hospitalo-Universitaire "Innovative Therapy for Immune Disorders", Créteil, France
| | - Yaniss Ouamri
- Univ Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Institut Mondor de Recherche Biomédicale (IMRB), Créteil, France.,Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Service d'Imagerie Médicale, Créteil, France
| | - Frédéric Pigneur
- Univ Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Institut Mondor de Recherche Biomédicale (IMRB), Créteil, France.,Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Service d'Imagerie Médicale, Créteil, France
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7
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Scheppach JB, Wu A, Gottesman RF, Mosley TH, Arsiwala-Scheppach LT, Knopman DS, Grams ME, Sharrett AR, Coresh J, Koton S. Association of Kidney Function Measures With Signs of Neurodegeneration and Small Vessel Disease on Brain Magnetic Resonance Imaging: The Atherosclerosis Risk in Communities (ARIC) Study. Am J Kidney Dis 2023; 81:261-269.e1. [PMID: 36179945 PMCID: PMC9974563 DOI: 10.1053/j.ajkd.2022.07.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 07/21/2022] [Indexed: 11/11/2022]
Abstract
RATIONALE & OBJECTIVE Chronic kidney disease (CKD) is a risk factor for cognitive decline, but evidence is limited on its etiology and morphological manifestation in the brain. We evaluated the association of estimated glomerular filtration rate (eGFR) and urinary albumin-creatinine ratio (UACR) with structural brain abnormalities visible on magnetic resonance imaging (MRI). We also assessed whether this association was altered when different filtration markers were used to estimate GFR. STUDY DESIGN Cross-sectional study nested in a cohort study. SETTING & PARTICIPANTS 1,527 participants in the Atherosclerosis Risk in Communities (ARIC) Study. PREDICTORS Log(UACR) and eGFR based on cystatin C, creatinine, cystatin C and creatinine in combination, or β2-microglobulin (B2M). OUTCOMES Brain volume reduction, infarcts, microhemorrhages, white matter lesions. ANALYTICAL APPROACH Multivariable linear and logistic regression models fit separately for each predictor based on a 1-IQR difference in the predictor value. RESULTS Each 1-IQR lower eGFR was associated with reduced cortex volume (regression coefficient: -0.07 [95% CI, -0.12 to-0.02]), greater white matter hyperintensity volume (logarithmically transformed; regression coefficient: 0.07 [95% CI, 0.01-0.15]), and lower white matter fractional anisotropy (regression coefficient: -0.08 [95% CI, -0.17 to-0.01]). The results were similar when eGFR was estimated with different equations based on cystatin C, creatinine, a combination of cystatin C and creatinine, or B2M. Higher log(UACR) was similarly associated with these outcomes as well as brain infarcts and microhemorrhages (odds ratios per 1-IQR-fold greater UACR of 1.31 [95% CI, 1.13-1.52] and 1.30 [95% CI, 1.12-1.51], respectively). The degree to which brain volume was lower in regions usually susceptible to Alzheimer disease and LATE (limbic-predominant age-related TDP-43 [Tar DNA binding protein 43] encephalopathy) was similar to that seen in the rest of the cortex. LIMITATIONS No inference about longitudinal effects due to cross-sectional design. CONCLUSIONS We found eGFR and UACR are associated with structural brain damage across different domains of etiology, and eGFR- and UACR-related brain atrophy is not selective for regions typically affected by Alzheimer disease and LATE. Hence, Alzheimer disease or LATE may not be leading contributors to neurodegeneration associated with CKD.
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Affiliation(s)
- Johannes B Scheppach
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland; Department of Nephrology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Aozhou Wu
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
| | - Rebecca F Gottesman
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland; Current affiliation: National Institute of Neurological Disorders and Stroke Intramural Research Program, Bethesda, Maryland
| | - Thomas H Mosley
- The MIND Center, University of Mississippi Medical Center, Jackson, Mississippi
| | | | | | - Morgan E Grams
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland; Division of Nephrology, Department of Medicine, School of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - A Richey Sharrett
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
| | - Josef Coresh
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
| | - Silvia Koton
- Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland; Stanley Steyer School of Health Professions, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
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8
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Tio MC, Shafi T, Zhu X, Kalantar-Zadeh K, Chan A, Nguyen L. Traditions and innovations in assessment of glomerular filtration rate using creatinine to cystatin C. Curr Opin Nephrol Hypertens 2023; 32:89-97. [PMID: 36444667 PMCID: PMC10278050 DOI: 10.1097/mnh.0000000000000854] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
PURPOSE OF REVIEW Glomerular filtration rate (GFR) is the best index for kidney function and estimated GFR (eGFR) calculated from endogenous filtration markers like serum creatinine and cystatin C is widely used in clinical practice for chronic kidney disease diagnosis and prognostication. We sought to review the evolution of GFR estimating equations, nuances of eGFR interpretation, and utility of eGFR in drug dosing. RECENT FINDINGS The Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) serum creatinine eGFR equation was recently updated to exclude the race variable and the CKD-EPI creatinine-cystatin C equation demonstrated the highest reliability. Although calculated creatinine clearance by Cockcroft Gault has been traditionally used for drug dosing, the use of eGFR is slowly being adapted by the Food and Drug Administration for pharmacokinetic studies. However, the individual-level accuracy of eGFR using the CKD-EPI 2021 equations remained low, with the distribution of measured GFR at a given eGFR value spanning several CKD stages. SUMMARY Although current methods of estimating GFR have improved in population measures of reliability, all have significant individual-level inaccuracies that can be an issue when clinical decision-making is contingent on the actual level of GFR. Modern methods of GFR measurements should be made widely available to enhance individualized patient decision-making.
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Affiliation(s)
- Maria Clarissa Tio
- Department of Medicine, Division of Nephrology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Tariq Shafi
- Department of Medicine, Division of Nephrology, University of Mississippi Medical Center, Jackson, Mississippi
- Department of Medicine, Division of Nephrology, Houston Methodist, Houston, Texas
| | - Xiaoqian Zhu
- The Memory Impairment and Neurodegenerative Dementia (MIND) Center, University of Mississippi Medical Center, Jackson, Mississippi
| | - Kamyar Kalantar-Zadeh
- Department of Medicine, Division of Nephrology, Hypertension, and Kidney Transplantation, University of California Irvine, Orange
| | - Alexandre Chan
- Department of Clinical Pharmacy Practice, School of Pharmacy and Pharmaceutical Sciences, College of Health Sciences, University of California Irvine, Irvine, California, USA
| | - Lee Nguyen
- Department of Clinical Pharmacy Practice, School of Pharmacy and Pharmaceutical Sciences, College of Health Sciences, University of California Irvine, Irvine, California, USA
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9
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Serum Metabolites Characterization Produced by Cats CKD Affected, at the 1 and 2 Stages, before and after Renal Diet. Metabolites 2022; 13:metabo13010043. [PMID: 36676969 PMCID: PMC9863800 DOI: 10.3390/metabo13010043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/20/2022] [Accepted: 12/20/2022] [Indexed: 12/29/2022] Open
Abstract
Utilizing metabolomics, a tool for measuring and characterizing low-molecular-weight substances (LMWs), to identify eventual changes in response to dietary intervention is novel in cats with chronic kidney disease (CKD), a condition characterized by retention of uremic solutes. This study aims to assess the serum metabolomic profile of cats in early stages of CKD and to compare the serum metabolomic of CKD cats after 60 days of a renal diet to evaluate the effect of dietary intervention on these metabolites. Twenty-five domestic cats were included in the study. Fifteen cats with CKD stages 1 (n = 6) and 2 (n = 9) according to the International Renal Interest Society (IRIS) were included in the renal groups, and a control group consisting of 10 cats was included. All animals were enrolled on a maintenance diet for 30 days before the experimental period. The metabolomics analysis was performed by gas chromatography-mass spectrometry (GC-MS). Partial least squares discriminant analysis (PLS-DA) was performed on Metaboanalyst 4.0 software. Forty-three metabolites were identified. Citric acid and monostearin were altered in the CKD2 group when compared to CKD1 and the control group at T0. A total of seven serum metabolites differed after 60 days of the renal diet: glycine, fructose, glutamic acid, arachidonic acid, stearic acid, creatinine, and urea. Changes were seen in the serum metabolomic profile after 60 days of the renal diet, and some of the metabolites that changed in response to the diet have beneficial effects on health. Overall, metabolomics markers have the potential to identify early stages of CKD, providing insights into the possible pathophysiologic processes that contribute to the development and progression of CKD.
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10
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Tao Y, Heskia F, Zhang M, Qin R, Kang B, Chen L, Wu F, Huang J, Brengel-Pesce K, Chen H, Mo X, Liang J, Wang W, Xu Z. Evaluation of acute kidney injury by urinary tissue inhibitor metalloproteinases-2 and insulin-like growth factor-binding protein 7 after pediatric cardiac surgery. Pediatr Nephrol 2022; 37:2743-2753. [PMID: 35211796 DOI: 10.1007/s00467-022-05477-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/18/2022] [Accepted: 01/19/2022] [Indexed: 10/19/2022]
Abstract
BACKGROUND With adult patients, the measurement of [TIMP-2]*[IGFBP7] can predict the risk of moderate to severe AKI within 12 h of testing. In pediatrics, however, the performance of [TIMP-2]*[IGFBP7] as a predictor of AKI was less studied and yet to be widely utilized in clinical practice. This study was conducted to validate the utility of [TIMP-2]*[IGFBP7] as an earlier biomarker for AKI prediction in Chinese infants and small children. METHODS We measured urinary [TIMP-2]*[IGFBP7] using NEPHROCHECK® at eight perioperative time points in 230 patients undergoing complex cardiac surgery and evaluated the performance of [TIMP-2]*[IGFBP7] for predicting severe AKI within 72 h of surgery. RESULTS A total of 50 (22%) of 230 developed AKI stages 2-3 within 72 h after CPB initiation. In the AKI stage 2-3 patients, two patterns of serum creatinine (SCr) elevations were observed. The patients with only a transient increase in SCr within 24 h (< 24 h, early AKI 2-3) did not experience a worse outcome than patients in AKI stage 0-1. AKI stage 2-3 patients with SCr elevation after 24 h (24-72 h, late AKI 2-3), as well as AKI dialysis patients (together designated severe AKI), did experience worse outcomes. Compared to AKI stages 0-1, significant elevations of [TIMP-2]*[IGFBP7] values were observed in severe AKI patients at hours T2, T4, T12, and T24 following CPB initiation. The AUC for predicting severe AKI with [TIMP-2]*[IGFBP7] at T2 (AUC = 0.76) and maximum T2/T24 (AUC = 0.80) are higher than other time points. The addition of the NEPHROCHECK® test to the postoperative parameters improved the risk assessment of severe AKI. CONCLUSIONS Multiple AKI phenotypes (early versus late AKI) were identified after pediatric complex cardiac surgery according to SCr-based AKI definition. Urinary [TIMP-2]*[IGFBP7] predicts late severe AKI (but not early AKI) as early as 2 h following CPB initiation. A higher resolution version of the Graphical abstract is available as Supplementary information.
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Affiliation(s)
- Yue Tao
- Shanghai Children's Medical Center-bioMérieux Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,The Laboratory of Pediatric Infectious Diseases, Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Fabienne Heskia
- Global Medical Affairs Department, bioMérieux SA, Marcy l'Etoile, France
| | - Mingjie Zhang
- Department of Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Rong Qin
- Global Medical Affairs Department, bioMérieux SA, Marcy l'Etoile, France
| | - Bin Kang
- Shanghai Children's Medical Center-bioMérieux Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,bioMérieux (Shanghai) Company Limited, Shanghai, China
| | - Luoquan Chen
- Shanghai Children's Medical Center-bioMérieux Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,bioMérieux (Shanghai) Company Limited, Shanghai, China
| | - Fei Wu
- Shanghai Children's Medical Center-bioMérieux Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,bioMérieux (Shanghai) Company Limited, Shanghai, China
| | - Jihong Huang
- Department of Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Karen Brengel-Pesce
- Open Innovation & Partnerships Department, bioMérieux SA, Marcy l'Etoile, France
| | - Huiwen Chen
- Department of Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Xi Mo
- Shanghai Children's Medical Center-bioMérieux Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,The Laboratory of Pediatric Infectious Diseases, Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Ji Liang
- Shanghai Children's Medical Center-bioMérieux Laboratory, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,bioMérieux (Shanghai) Company Limited, Shanghai, China
| | - Wei Wang
- Department of Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Zhuoming Xu
- Department of Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
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Sharma A, Sahasrabudhe V, Musib L, Zhang S, Younis I, Kanodia J. Time to Rethink the Current Paradigm for Assessing Kidney Function in Drug Development and Beyond. Clin Pharmacol Ther 2022; 112:946-958. [PMID: 34800044 PMCID: PMC9786617 DOI: 10.1002/cpt.2489] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 11/11/2021] [Indexed: 12/30/2022]
Abstract
Chronic kidney disease (CKD) is an important health issue that affects ~ 9.1% of the world adult population. Serum creatinine is the most commonly used biomarker for assessing kidney function and is utilized in different equations for estimating creatinine clearance or glomerular filtration rate (GFR). The Cockcroft-Gault formula for adults and "original" Schwartz formula for children have been the most commonly used equations for estimating kidney function during the last 3-4 decades. Introduction of standardized serum creatinine bioanalytical methodology has reduced interlaboratory variability but is not intended to be used with Cockcroft-Gault or original Schwartz equations. More accurate equations (for instance, Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) for adults and bedside Schwartz or Chronic Kidney Disease in Children Schwartz equation for children) based on standardized serum creatinine values (and another biomarker-cystatin C) have been introduced and validated in recent years. Recently, the CKD-EPI equation refitted without a race variable was introduced. Clinical practice guidance in nephrology advocates a shift to these equations for managing health care of patients with CKD. The guidance also recommends use of albuminuria in addition to GFR for CKD diagnosis and management. Significant research with large data sets would be necessary to evaluate whether this paradigm would also be valuable in drug dose adjustments. This article attempts to highlight some important advancements in the field from a clinical pharmacology perspective and is a call to action to industry, regulators, and academia to rethink the current paradigm for assessing kidney function to enable dose recommendation in patients with CKD.
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Affiliation(s)
- Ashish Sharma
- Boehringer Ingelheim PharmaceuticalsRidgefieldConnecticutUSA
| | | | - Luna Musib
- Gilead Sciences IncFoster CityCaliforniaUSA
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12
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Impact of Elevated LDH on Cystatin C-Based Glomerular Filtration Rate Estimates in Patients with Cancer. J Clin Med 2022; 11:jcm11185458. [PMID: 36143104 PMCID: PMC9503681 DOI: 10.3390/jcm11185458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 09/06/2022] [Accepted: 09/14/2022] [Indexed: 11/16/2022] Open
Abstract
Background: The determination of renal function is crucial for the clinical management of patients with cancer. The glomerular filtration rate (GFR) serves as a key parameter, estimated by creatinine clearance determination in 24-h collected urine (CrCl) as well as equation-based approaches (eGFR) relying on serum creatinine (eGFR CKD EPIcrea) or serum cystatin C (eGFR cystatin C). Serum creatinine and serum cystatin C levels differentially depend on muscle and tumor mass, respectively. Although muscle and tumor mass may thus represent confounding factors, comparative studies for eGFR estimate approaches in cancer patients are lacking. Methods: The present study retrospectively analyzed GFR estimates based on equations of creatinine (eGFRcr), cystatin C (eGFRcys) and combined creatinine-cystatin C levels (eGFRcr-cys) in a subset of patients. The associations of LDH with cystatin C or LDH with eGFRcr, eGFRcys and GFRcr-cys were explored. Results: The laboratory values of 123 consecutive patients were included. The median age was 59 (24−87) and 47.2% were female. There was a statistically significant difference in the mean of CKD EPIcrea (85.17 ± 21.63 mL/min/1.73 m2), CKD EPIcys (61.16 ± 26.03 mL/min/1.73 m2) and CKD EPIcrea-cys (70.42 ± 23.89 mL/min/1.73 m2) (p < 0.0001). Spearman’s correlation analysis revealed a significant correlation of elevated plasma LDH >1.5 UNV and cystatin C values (r = 0.270, p < 0.01, n = 123). LDH values >1.5 UNV were associated with significantly lower CKD EPIcys (r = 0.184, p < 0.01) or CKD EPIcrea-cys (r = 0.226, p < 0.05) estimates compared to CKD EPIcrea. Conclusions: The inclusion of cystatin C as a biomarker led to a lower eGFR estimates compared to creatinine alone or in a combination of both cystatin C and creatinine. The level of cystatin C correlated with the level of LDH, suggesting that the use of cystatin C-based calculations of GFR in cancer patients with elevated LDH should be used with caution.
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Creatinine standardization: a key consideration in evaluating whole blood creatinine monitoring systems for CKD screening. Anal Bioanal Chem 2022; 414:3279-3289. [PMID: 35260937 PMCID: PMC8956531 DOI: 10.1007/s00216-022-03942-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/16/2022] [Accepted: 01/31/2022] [Indexed: 11/28/2022]
Abstract
Early detection of CKD using point of care creatinine and eGFR testing improves patient management outcomes. We undertook a field study to evaluate the use of a whole blood creatinine/eGFR device to screen a rural Nicaraguan population to determine the variability between creatinine methods and specimen types. All specimens including capillary and venous dried blood spots (DBS) were tested with an isotope dilution liquid chromatography mass spectrometry (ID-LCMS) gold standard method. This is to our knowledge the first time a capillary whole blood (POC) method has been directly compared to the gold standard IDMS method, through the novel approach of using dried blood spots. Capillary and venous whole blood specimens were obtained and tested directly with the BCMS method, and then, DBS samples were prepared. Venous plasma specimens were tested using three laboratory analyzer creatinine methods. DBS were sent to the site performing ID-LCMS. Control samples were also prepared to assess the stability of shipment and storage of DBS. The ID-LCMS method was aligned using primary and secondary standards. Sixty-six (66) patients participated in the study, and the CKD prevalence rate was 7.8%. While all creatinine methods showed a good correlation to ID-LCMS, there was a positive bias (mean absolute bias range: 0.21–0.63 mg/dL). All methods used were 100% sensitive, but specificity varied from 62.7 to 94.9% with PPV ranging from 25 to 62.5%. A correction factor was used to align the values from each method to ID-LCMS which improved the specificity of each method. This study used a unique DBS approach to align capillary whole blood creatinine to ID-LCMS. To ensure reliability of BCMS for identifying screened patients with CKD, it is important to establish IDMS traceability and alignment prior to undertaking CKD studies.
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Malavasi VL, Valenti AC, Ruggerini S, Manicardi M, Orlandi C, Sgreccia D, Vitolo M, Proietti M, Lip GYH, Boriani G. Kidney Function According to Different Equations in Patients Admitted to a Cardiology Unit and Impact on Outcome. J Clin Med 2022; 11:jcm11030891. [PMID: 35160341 PMCID: PMC8837128 DOI: 10.3390/jcm11030891] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/28/2022] [Accepted: 02/05/2022] [Indexed: 12/11/2022] Open
Abstract
Background: This paper aims to evaluate the concordance between the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formula and alternative equations and to assess their predictive power for all-cause mortality in unselected patients discharged alive from a cardiology ward. Methods: We retrospectively included patients admitted to our Cardiology Division independently of their diagnosis. The total population was classified according to Kidney Disease: Improving Global Outcomes (KDIGO) categories, as follows: G1 (estimated glomerular filtration rate (eGFR) ≥90 mL/min/1.73 m2); G2 (eGFR 89–60 mL/min/1.73 m2); G3a (eGFR 59–45 mL/min/1.73 m2); G3b (eGFR 44–30 mL/min/1.73 m2); G4 (eGFR 29–15 mL/min/1.73 m2); G5 (eGFR <15 mL/min/1.73 m2). Cockcroft-Gault (CG), CG adjusted for body surface area (CG-BSA), Modification of Diet in Renal Disease (MDRD), Berlin Initiative Study (BIS-1), and Full Age Spectrum (FAS) equations were also assessed. Results: A total of 806 patients were included. Good agreement was found between the CKD-EPI formula and CG-BSA, MDRD, BIS-1, and FAS equations. In subjects younger than 65 years or aged ≥85 years, CKD-EPI and MDRD showed the highest agreement (Cohen’s kappa (K) 0.881 and 0.588, respectively) while CG showed the lowest. After a median follow-up of 407 days, overall mortality was 8.2%. The risk of death was higher in lower eGFR classes (G3b HR4.35; 95%CI 1.05–17.80; G4 HR7.13; 95%CI 1.63–31.23; G5 HR25.91; 95%CI 6.63–101.21). The discriminant capability of death prediction tested with ROC curves showed the best results for BIS-1 and FAS equations. Conclusion: In our cohort, the concordance between CKD-EPI and other equations decreased with age, with the MDRD formula showing the best agreement in both younger and older patients. Overall, mortality rates increased with the renal function decreasing. In patients aged ≥75 years, the best discriminant capability for death prediction was found for BIS-1 and FAS equations.
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Affiliation(s)
- Vincenzo Livio Malavasi
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
| | - Anna Chiara Valenti
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
| | - Sara Ruggerini
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
| | - Marcella Manicardi
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
| | - Carlotta Orlandi
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
| | - Daria Sgreccia
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
| | - Marco Vitolo
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
- Clinical and Experimental Medicine PhD Program, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy
- Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool L14 3PE, UK; (M.P.); (G.Y.H.L.)
| | - Marco Proietti
- Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool L14 3PE, UK; (M.P.); (G.Y.H.L.)
- Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy
- Geriatric Unit, IRCCS Istituti Clinici Scientifici Maugeri, 20138 Milan, Italy
| | - Gregory Y. H. Lip
- Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool L14 3PE, UK; (M.P.); (G.Y.H.L.)
- Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Aalborg University, 9220 Aalborg, Denmark
| | - Giuseppe Boriani
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, 41125 Modena, Italy; (V.L.M.); (A.C.V.); (S.R.); (M.M.); (C.O.); (D.S.); (M.V.)
- Correspondence:
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15
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Starybrat D, Jepson R, Bristow P, Peterson S, Yerramilli M, Yerramilli M, Chang Y, Cortellini S. Prospective evaluation of novel biomarkers of acute kidney injury in dogs following cardiac surgery under cardiopulmonary bypass. J Vet Emerg Crit Care (San Antonio) 2022; 32:733-742. [PMID: 36125401 PMCID: PMC9826260 DOI: 10.1111/vec.13250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/13/2021] [Accepted: 11/12/2021] [Indexed: 01/18/2023]
Abstract
OBJECTIVE To assess the occurrence of acute kidney injury (AKI) in dogs undergoing cardiac surgery under cardiopulmonary bypass (CPB) and explore associations between traditional and novel serum and urinary biomarkers. DESIGN Prospective cohort study conducted between July 2018 and April 2019. SETTING University teaching hospital. ANIMALS Nineteen dogs undergoing cardiac surgery under CPB with preoperative serum creatinine <140 μmol/L (<1.6 mg/dl). INTERVENTIONS Blood and urine samples were obtained at 4 time points: preoperatively following general anesthesia induction, immediately postoperatively, and 2 and 4 days postoperatively (T1 , T2 , T3 , and T4 ). AKI was defined as an increase in serum creatinine ≥26.4 μmol/L (≥0.3 mg/dl) above baseline within 48 hours. Serum creatinine, C-reactive protein (CRP), symmetric dimethylarginine (SDMA), inosine, beta-aminoisobutyric acid (BAIB), urinary clusterin (uClus), and urinary cystatin B (uCysB) were measured. Data were log-transformed (log10 ) when appropriate and assessed using linear mixed-effects models. MEASUREMENTS AND MAIN RESULTS AKI occurred in 3 of 19 dogs (15.8%, 95% confidence interval: 0.047-0.384). Inosine increased at T2 (adjusted mean ± standard error: 53 ± 5.6) in all dogs, and then gradually decreased. Log10 uCysB increased at T2 (2.3 ± 0.1) in all dogs and remained high. Log10 CRP and log10 uClus increased significantly at T3 (1.9 ± 0.1 and 3.6 ± 0.1, respectively) in all dogs and remained increased. There was a significant positive association between serum creatinine and SDMA (P < 0.001, estimate ± standard error: 0.06 ± 0.00), between log10 CRP and log10 uClus (P < 0.001, 0.35 ± 0.08), between SDMA and creatinine as well as between SDMA and BAIB (P < 0.001, 11.1 ± 0.83 and P < 0.001, 1.06 ± 0.22, respectively) for all dogs at all time points. CONCLUSIONS Inosine and uCysB concentrations changed in all dogs immediately following a surgery under CPB and may indicate tubular injury. Further studies are required to ascertain the usefulness of those biomarkers in early detection of AKI.
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Affiliation(s)
- Daria Starybrat
- Department of Clinical Science and Services, The Royal Veterinary CollegeUniversity of LondonLondonUK
| | - Rosanne Jepson
- Department of Clinical Science and Services, The Royal Veterinary CollegeUniversity of LondonLondonUK
| | - Poppy Bristow
- Department of Clinical Science and Services, The Royal Veterinary CollegeUniversity of LondonLondonUK
- Dick White Referrals, Six Mile‐BottomCambridgeshireCB8 0UHUK
| | | | - Maha Yerramilli
- Translation Medicine/BioMarker DevelopmentNovartis Institute of Biomedical Research Inc.CambridgeMassachusettsUSA
| | | | - Yu‐Mei Chang
- Department of Comparative Biomedical Sciences, The Royal Veterinary CollegeUniversity of LondonLondonUK
| | - Stefano Cortellini
- Department of Clinical Science and Services, The Royal Veterinary CollegeUniversity of LondonLondonUK
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Healthy and Chronic Kidney Disease (CKD) Dogs Have Differences in Serum Metabolomics and Renal Diet May Have Slowed Disease Progression. Metabolites 2021; 11:metabo11110782. [PMID: 34822440 PMCID: PMC8623449 DOI: 10.3390/metabo11110782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 10/28/2021] [Accepted: 11/03/2021] [Indexed: 11/17/2022] Open
Abstract
Chronic kidney disease (CKD) is highly prevalent in dogs, and metabolomics investigation has been recently introduced for a better understanding of the role of diet in CKD. This study aimed to compare the serum metabolomic profile of healthy dogs (CG) and dogs with CKD (CKD-T0 and CKD-T6) to evaluate whether the diet would affect metabolites. Six dogs (5 females; 1 male; 7.47 ± 2.31 years old) with CKD stage 3 or 4 (IRIS) were included. CG consisted of 10 healthy female dogs (5.89 ± 2.57 years old) fed a maintenance diet. Serum metabolites were analyzed by 1H nuclear magnetic resonance (1H NMR) spectra. Principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA) were performed to assess differences in metabolomic profiles between groups and before (CKD-T0) and after renal diet (CKD-T6). Data analysis was performed on SIMCA-P software. Dogs with CKD showed an altered metabolic profile with increased urea, creatinine, creatine, citrate, and lipids. Lactate, branched-chain amino acids (BCAAs), and glutamine were decreased in the CKD group. However, after 6 months of diet, the metabolite profiles of CKD-T0 and CKD-T6 were similar. Metabolomics profile may be useful to evaluate and recognize metabolic dysfunction and progression of CKD, and the diet may have helped maintain and retard the progression of CKD.
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McNair ED, Bezaire J, Moser M, Mondal P, Conacher J, Franczak A, Sawicki G, Reid D, Khani-Hanjani A. The Association of Matrix Metalloproteinases With Acute Kidney Injury Following CPB-Supported Cardiac Surgery. Can J Kidney Health Dis 2021; 8:20543581211019640. [PMID: 34350005 PMCID: PMC8287351 DOI: 10.1177/20543581211019640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 04/19/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Cardiac surgery-associated acute kidney injury (AKI) is an adverse outcome that increases morbidity and mortality in patients undergoing cardiac surgical procedures. To date, the use of serum creatinine levels as an early indicator of AKI has limitations because of its slow rise and poor predictive accuracy for renal injury. This delay in diagnosis may lead to prolonged initiation in treatment and increased risk for adverse outcomes. OBJECTIVE This pilot study explores serum and urine matrix metalloproteinases (MMPs)-2 and MMP-9 and their association, and potentially earlier detection of AKI in patients following cardiopulmonary bypass (CPB)-supported cardiac surgery. We hypothesize that increased activity of serum and urine levels MMP-2 and/ or MMP-9 are associated with AKI. Furthermore, MMP-2 and/ or MMP-9 may provide earlier identification of AKI as compared with serum levels of creatinine. METHODS During the study period, there were 150 CPB-supported surgeries, 21 of which developed AKI according to the Kidney Disease Improving Global Outcomes criteria. We then selected a sample of 21 matched cases from those patients who went through the surgery without developing AKI. Primary outcomes were the measurement via gel zymography of the serum and urine activity of MMP-2 and MMP-9 drawn at the following intervals: pre-CPB; 10-minute post-CPB; and 4-hour post-CPB time points. Secondary variables were the measurement of serum creatinine, intensive care unit (ICU) fluid balance, and length of ICU stay. RESULTS At the 10-minute and 4-hour post-CPB time points, the serum MMP-2 activity of AKI patients were significantly higher as compared with non-AKI patients (P < .001 and P = .004), respectively. Similarly, at the 10-minute and 4-hour post-CPB time points, the serum MMP-9 activity of AKI patients was significantly higher as compared with non-AKI patients (P = .001 and P = .014), respectively. The activity of urine MMP-2 and MMP-9 of AKI patients was significantly higher as compared with non-AKI patients at all 3 time points (P = .004, P < .001, P < .001), respectively. CONCLUSION Although the pilot study may have limitations, it has demonstrated that the serum and urine levels of activity of MMP-2 and MMP-9 are associated with the clinical endpoint of AKI and appear to have earlier rising levels as compared with those of serum creatinine. Furthermore, in depth, exploration is underway with a larger sample size to attempt validation of the analytical performance and reproducibility of the assay for MMP-2 and MMP-9 to aid in earlier diagnosis of AKI following CPB-supported cardiac surgery.
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Affiliation(s)
- Erick D. McNair
- Department of Pathology and Laboratory
Medicine, College of Medicine, University of Saskatchewan, Saskatoon, Canada
- Department of Surgery/Division of
Cardiac Surgery, College of Medicine, University of Saskatchewan, Saskatoon,
Canada
| | - Jennifer Bezaire
- Department of Pathology and Laboratory
Medicine, College of Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Michael Moser
- Department of Medicine, College of
Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Prosanta Mondal
- Department of Community Health and
Epidemiology, College of Medicine, University of Saskatchewan, Saskatoon,
Canada
| | - Josie Conacher
- Department of Pathology and Laboratory
Medicine, College of Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Aleksandra Franczak
- Department of Medicine, College of
Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Greg Sawicki
- Department of Pharmacology, College of
Medicine, University of Saskatchewan, Saskatoon, Canada
| | - David Reid
- Department of Medicine, College of
Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Abass Khani-Hanjani
- Department of Surgery/Division of
Cardiac Surgery, College of Medicine, University of Saskatchewan, Saskatoon,
Canada
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Evaluation of the pharmacokinetic drug-drug interaction potential of iohexol, a renal filtration marker. Cancer Chemother Pharmacol 2020; 86:535-545. [PMID: 32948918 DOI: 10.1007/s00280-020-04145-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 09/06/2020] [Indexed: 12/13/2022]
Abstract
PURPOSE Carboplatin dose is calculated based on kidney function, commonly estimated with imperfect creatinine-based formulae. Iohexol is used to measure glomerular filtration rate (GFR) and allows calculation of a more appropriate carboplatin dose. To address potential concerns that iohexol administered during a course of chemotherapy impacts that therapy, we performed in vitro and in vivo pharmacokinetic drug-drug interaction evaluations of iohexol. METHODS Carboplatin was administered IV to female mice at 60 mg/kg with or without iohexol at 300 mg/kg. Plasma ultrafiltrate, kidney and bone marrow platinum was quantitated by atomic absorption spectrophotometry. Paclitaxel microsomal and gemcitabine cytosolic metabolism as well as metabolism of CYP and UGT probes was assessed with and without iohexol at 300 µg/mL by LC-MS/MS. RESULTS In vivo carboplatin exposure was not significantly affected by iohexol co-administration (platinum AUC combination vs alone: plasma ultrafiltrate 1,791 vs 1920 µg/mL min; kidney 8367 vs 9757 µg/g min; bone marrow 12.7 vs 12.7 µg/mg-protein min). Paclitaxel microsomal metabolism was not impacted (combination vs alone: 6-α-OH-paclitaxel 38.3 versus 39.4 ng/mL/60 min; 3-p-OH-paclitaxel 26.2 versus 27.7 ng/mL/60 min). Gemcitabine human cytosolic elimination was not impacted (AUC combination vs gemcitabine alone: dFdU 24.1 versus 23.7 µg/mL/30 min). Iohexol displayed no relevant inhibition of the CYP and UGT enzymes in human liver microsomes. CONCLUSIONS Iohexol is unlikely to affect the clinical pharmacokinetics of carboplatin, paclitaxel, gemcitabine, or other agents used in combination with carboplatin treatment. Measuring GFR with iohexol to better dose carboplatin is unlikely to alter the safety or efficacy of chemotherapy through pharmacokinetic drug-drug interactions.
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Hamada S, Kato C, Takahashi T, Hayashi A, Ueda Y, Sato Y, Tonoki H, Okamoto T. A girl presenting with gradually elevated levels of serum creatinine: Answers. Pediatr Nephrol 2020; 35:1427-1428. [PMID: 31960139 DOI: 10.1007/s00467-020-04479-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 01/06/2020] [Accepted: 01/08/2020] [Indexed: 11/27/2022]
Affiliation(s)
- Shiori Hamada
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15, West 7, Sapporo, Japan
| | - Chie Kato
- Department of Nutritional Management Center, Hokkaido University Hospital, Sapporo, Japan
| | - Toshiyuki Takahashi
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15, West 7, Sapporo, Japan
| | - Asako Hayashi
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15, West 7, Sapporo, Japan
| | - Yasuhiro Ueda
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15, West 7, Sapporo, Japan
| | - Yasuyuki Sato
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15, West 7, Sapporo, Japan
| | - Hidefumi Tonoki
- Medical Genetics Center, Department of Pediatrics, Tenshi Hospital, Sapporo, Japan
| | - Takayuki Okamoto
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15, West 7, Sapporo, Japan.
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Shah KF, Stevens PE, Lamb EJ. The influence of a cooked-fish meal on estimated glomerular filtration rate. Ann Clin Biochem 2019; 57:182-185. [PMID: 31856580 DOI: 10.1177/0004563219899673] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BackgroundIngestion of cooked meat increases circulating blood creatinine concentration due to conversion of creatine during cooking. This may cause falsely low estimated glomerular filtration rate. National Institute for Health and Care Excellence chronic kidney disease guidelines recommend meat avoidance prior to blood testing for estimated glomerular filtration rate. Fish muscle also contains creatine, but the influence of fish consumption on blood creatinine concentration has not been studied.MethodFour blood samples were collected from each of 20 healthy volunteers: one before and three (at 2, 4 and 20 h) after consuming cooked fish (200 g/person cod, approximately 35 g/person protein). Apart from this meal, for the study duration, subjects were asked to avoid eating meat or fish. Creatinine and cystatin C were measured and estimated glomerular filtration rate (CKD-EPI equations) was calculated.ResultsSerum creatinine concentration (mean) was increased relative to the preprandial concentration (71.8 μmol/L) in all subjects at 2 h (77.3 μmol/L) and in 17/20 subjects at 4 h (75.5 μmol/L) ( P < 0.0001) but was not significantly different from baseline after 20 h (73.6 μmol/L P = 0.1170). Mean cystatin C concentration remained unchanged throughout the study ( P > 0.05). Estimated glomerular filtration rate calculated using the CKD-EPI (creatinine) and CKD-EPI (creatinine and cystatin C) equations demonstrated significant declines at 2 and 4 h ( P < 0.0005), while the CKD-EPI (cystatin C) equation remained unchanged ( P > 0.05).ConclusionCooked fish consumption transiently increases blood creatinine concentration and consequently lowers the estimates of glomerular filtration rate derived from creatinine-based equations. Consideration should be given to avoidance of cooked fish consumption before glomerular filtration rate estimation.
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Affiliation(s)
- Kezah F Shah
- Clinical Biochemistry, East Kent Hospitals University NHS Foundation Trust, Canterbury, UK
| | - Paul E Stevens
- Renal Medicine, East Kent Hospitals University NHS Foundation Trust, Canterbury, UK
| | - Edmund J Lamb
- Clinical Biochemistry, East Kent Hospitals University NHS Foundation Trust, Canterbury, UK
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21
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Effect of beef ingestion by humans on plasma concentrations of creatinine, urea, and cystatin C. Clin Biochem 2018; 58:26-31. [DOI: 10.1016/j.clinbiochem.2018.05.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 05/24/2018] [Accepted: 05/24/2018] [Indexed: 12/31/2022]
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McCudden C, Akbari A, White CA, Biyani M, Hiremath S, Brown PA, Tangri N, Brimble S, Knoll G, Blake PG, Sood MM. Individual patient variability with the application of the kidney failure risk equation in advanced chronic kidney disease. PLoS One 2018; 13:e0198456. [PMID: 29894480 PMCID: PMC5997334 DOI: 10.1371/journal.pone.0198456] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 05/18/2018] [Indexed: 12/28/2022] Open
Abstract
The Kidney Failure Risk Equation (KFRE) predicts the need for dialysis or transplantation using age, sex, estimated glomerular filtration rate (eGFR), and urine albumin to creatinine ratio (ACR). The eGFR and ACR have known biological and analytical variability. We examined the effect of biological and analytical variability of eGFR and ACR on the 2-year KFRE predicted kidney failure probabilities using single measure and the average of repeat measures of simulated eGFR and ACR. Previously reported values for coefficient of variation (CV) for ACR and eGFR were used to calculate day to day variability. Variation was also examined with outpatient laboratory data from patients with an eGFR between 15 and 50 mL/min/1.72 m2. A web application was developed to calculate and model day to day variation in risk. The biological and analytical variability related to ACR and eGFR lead to variation in the predicted probability of kidney failure. A male patient age 50, ACR 30 mg/mmol and eGFR 25, had a day to day variation in risk of 7% (KFRE point estimate: 17%, variability range 14% to 21%). The addition of inter laboratory variation due to different instrumentation increased the variability to 9% (KFRE point estimate 17%, variability range 13% to 22%). Averaging of repeated measures of eGFR and ACR significantly decreased the variability (KFRE point estimate 17%, variability range 15% to 19%). These findings were consistent when using outpatient laboratory data which showed that most patients had a KFRE 2-year risk variability of ≤ 5% (79% of patients). Approximately 13% of patients had variability from 5–10% and 8% had variability > 10%. The mean age (SD) of this cohort was 64 (15) years, 36% were females, the mean (SD) eGFR was 32 (10) ml/min/1.73m2 and median (IQR) ACR was 22.7 (110). Biological and analytical variation intrinsic to the eGFR and ACR may lead to a substantial degree of variability that decreases with repeat measures. Use of a web application may help physicians and patients understand individual patient’s risk variability and communicate risk (https://mccudden.shinyapps.io/kfre_app/). The web application allows the user to alter age, gender, eGFR, ACR, CV (for both eGFR and ACR) as well as units of measurements for ACR (g/mol versus mg/g).
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Affiliation(s)
- Christopher McCudden
- Department of Pathology and Laboratory Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Ayub Akbari
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Kidney Research Centre/The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
- * E-mail:
| | - Christine A. White
- Division of Nephrology, Department of Medicine, Queen’s University, Kingston, Ontario, Canada
| | - Mohan Biyani
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Kidney Research Centre/The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Swapnil Hiremath
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Kidney Research Centre/The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Pierre Antoine Brown
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Kidney Research Centre/The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Navdeep Tangri
- Seven Oaks General Hospital, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Scott Brimble
- Division of Nephrology, Department of Medicine, McMaster University, Hamilton, Canada
| | - Greg Knoll
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Kidney Research Centre/The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Peter G. Blake
- Western University and London Health Sciences Centre, London, Canada
| | - Manish M. Sood
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Kidney Research Centre/The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
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Nagai T, Sundaram V, Shoaib A, Shiraishi Y, Kohsaka S, Rothnie KJ, Piper S, McDonagh TA, Hardman SMC, Goda A, Mizuno A, Sawano M, Rigby AS, Quint JK, Yoshikawa T, Clark AL, Anzai T, Cleland JGF. Validation of U.S. mortality prediction models for hospitalized heart failure in the United Kingdom and Japan. Eur J Heart Fail 2018; 20:1179-1190. [PMID: 29846026 DOI: 10.1002/ejhf.1210] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 03/15/2018] [Accepted: 04/09/2018] [Indexed: 12/13/2022] Open
Abstract
AIMS Prognostic models for hospitalized heart failure (HHF) were developed predominantly for patients of European origin in the United States of America; it is unclear whether they perform similarly in other health care systems or for different ethnicities. We sought to validate published prediction models for HHF in the United Kingdom (UK) and Japan. METHODS AND RESULTS Patients in the UK (n =894) and Japan (n =3158) were prospectively enrolled and were similar in terms of sex (∼60% men) and median age (∼77 years). Models predicted that British patients would have a higher mortality than Japanese, which was indeed true both for in-hospital (4.8% vs. 2.5%) and 180-day (20.7% vs. 9.5%) mortality. The model c-statistics for the published/derivation (range 0.70-0.76) and Japanese (range 0.75-0.77) cohorts were similar and higher than for the UK (0.62-0.75) but models consistently overestimated mortality in Japan. For in-hospital mortality, the OPTIMIZE-HF model performed best, providing similar discrimination in published/derivation, UK and Japanese cohorts [c-indices: 0.75 (0.74-0.77); 0.75 (0.68-0.81); and 0.77 (0.70-0.83), respectively], and least overestimated mortality in Japan. For 180-day mortality, the c-statistics for the ASCEND-HF model were similar in published/derivation (0.70) and UK [0.69 (0.64-0.74)] cohorts but higher in Japan [0.75 (0.71-0.79)]; calibration was good in the UK but again overestimated mortality in Japan. CONCLUSION Calibration of published prediction models appears moderately accurate and unbiased when applied to British patients but consistently overestimates mortality in Japan. Identifying the reason why patients in Japan have a better than predicted prognosis is of great interest.
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Affiliation(s)
- Toshiyuki Nagai
- National Heart & Lung Institute, Imperial College London, London, UK.,Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan.,Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Varun Sundaram
- National Heart & Lung Institute, Imperial College London, London, UK.,Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan.,Harington Heart and Vascular Institute, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, USA, and Royal Brompton and Harefield Hospitals, London, UK
| | - Ahmad Shoaib
- Department of Cardiology, Hull York Medical School, Castle Hill Hospital, Kingston-upon-Hull, UK
| | - Yasuyuki Shiraishi
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Shun Kohsaka
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Kieran J Rothnie
- National Heart & Lung Institute, Imperial College London, London, UK
| | - Susan Piper
- Cardiology Department, King's College Hospital, London, UK
| | | | - Suzanna M C Hardman
- Clinical & Academic Department of Cardiovascular Medicine, Whittington Hospital, London, UK
| | - Ayumi Goda
- Division of Cardiology, Kyorin University School of Medicine, Tokyo, Japan
| | - Atsushi Mizuno
- Department of Cardiology, St. Luke's International Hospital, Tokyo, Japan
| | - Mitsuaki Sawano
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Alan S Rigby
- Department of Statistics, Hull York Medical School, University of Hull, Kingston-upon-Hull, UK
| | - Jennifer K Quint
- National Heart & Lung Institute, Imperial College London, London, UK
| | | | - Andrew L Clark
- Department of Cardiology, Hull York Medical School, Castle Hill Hospital, Kingston-upon-Hull, UK
| | - Toshihisa Anzai
- Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan.,Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - John G F Cleland
- Robertson Centre for Biostatistics & Clinical Trials, University of Glasgow and National Heart & Lung Institute, Royal Brompton & Harefield Hospitals, Imperial College London, London, UK
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24
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Erlandsen EJ, Randers E. Reference intervals for plasma cystatin C and plasma creatinine in adults using methods traceable to international calibrators and reference methods. J Clin Lab Anal 2018; 32:e22433. [PMID: 29573343 DOI: 10.1002/jcla.22433] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 02/19/2018] [Indexed: 01/08/2023] Open
Abstract
INTRODUCTION The aim of this study was to establish reference intervals for plasma cystatin C and creatinine in adults using the Gentians cystatin C method traceable to the international calibrator standard ERM-DA471/IFCC and a creatinine method traceable to the IDMS (Isotope Dilution Mass Spectrometry) creatinine reference method. METHODS Blood samples were collected from 304 healthy blood donors (152 men and 152 women between 17 and 66 years old) with 30-31 men and 30-31 women in each ten-year interval. Plasma cystatin C was analyzed using the Gentian Cystatin C assay on a Roche cobas c702 analyzer, and plasma creatinine was analyzed using the CREA Plus assay on the Roche Modular P analyzer. RESULTS The nonparametric reference intervals for plasma cystatin C were 0.58-1.00 mg/L in women (median 0.78 mg/L, range 0.56-1.06 mg/L) and 0.62-1.04 mg/L in men (median 0.79 mg/L, range 0.61-1.07 mg/L). The Mann-Whitney U test revealed no gender-related difference in plasma cystatin C (P = .21). A common reference interval in women and men was calculated to be 0.61-1.01 mg/L (median 0.79 mg/L, range 0.56-1.07 mg/L). The nonparametric reference interval for plasma creatinine was 52-89 μmol/L in women (median 69 μmol/L, range 52-92 μmol/L) and 61-108 μmol/L in men (median 86 μmol/L, range 56-118 μmol/L). The Mann-Whitney U test revealed a gender-related difference in plasma creatinine (P < .0001). CONCLUSION In conclusion, we have established reference intervals for plasma cystatin C and creatinine in adults using methods traceable to international standards.
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Affiliation(s)
| | - Else Randers
- Department of Internal Medicine, Viborg Regional Hospital, Viborg, Denmark
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25
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Effect of socio-demographic factors on endogenous biomarkers (cystatin C and creatinine) among elderly chronic kidney disease patients: a cross-sectional study. Int Urol Nephrol 2018. [PMID: 29536424 DOI: 10.1007/s11255-018-1834-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
PURPOSE Creatinine is normally used to evaluate kidney function among elderly patients in clinical practice, which has been reported to be affected by socio-demographic factors like BMI and age. Cystatin C a newly introduced biomarker may be more efficient in identifying kidney function in obese and aged CKD patients. The aim of the current study was to assess the effect of BMI on endogenous biomarkers (cystatin C and creatinine) among elderly CKD patients in Malaysia, a first such study in the country. METHODS The current study was conducted at the Hospital University Sains Malaysia, Kelantan. A total of 300 elderly Malay participants ≥ 65 years, with CKD, were taken in study. Demographic data, blood pressure, weight, and height were documented. Serum creatinine was assayed by Chemistry Analyzer Model Architect-C8000 (Jaffe Method), while serum cystatin C was examined by Human cystatin C ELISA kit (Sigma-Aldrich) using Thermo Scientific Varioskan Flash ELISA reader. RESULTS The study participants were divided into three groups on the basis of age. There was a statistically significant difference at the p value < 0.05 in serum creatinine level for the three age groups [F (2, 297) = 1.98, p value 0.045]. Patients were divided into four groups on the basis of BMI. The results of one-way ANOVA revealed a statistically significant difference at the p value < 0.05 in the mean serum creatinine level for the four groups [F (3, 396) = 2.99, p value 0.032]. However, no statistically significant differences between mean serum cystatin C levels were observed on the basis of patient's age and BMI. CONCLUSION Cystatin C is not related to BMI and age among elderly chronic kidney disease patients. The study clearly evaluates the role of serum cystatin C as a good competitor of creatinine among the elderly CKD patients.
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Hilderink JM, van der Linden N, Kimenai DM, Litjens EJR, Klinkenberg LJJ, Aref BM, Aziz F, Kooman JP, Rennenberg RJMW, Bekers O, Koopmans RP, Meex SJR. Biological Variation of Creatinine, Cystatin C, and eGFR over 24 Hours. Clin Chem 2018; 64:851-860. [PMID: 29483105 DOI: 10.1373/clinchem.2017.282517] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 02/07/2018] [Indexed: 01/03/2023]
Abstract
BACKGROUND Estimated glomerular filtration rate (eGFR) is widely used in clinical practice. This study assessed the within-subject biological variation (CVI) of different eGFR equations in people with chronic kidney disease (CKD) and people without CKD. The aims of this study were (a) to determine the 24-h biological variation profiles of creatinine, cystatin C, and eGFR and (b) to determine whether CVI of creatinine, cystatin C, and eGFR changes on deterioration of glomerular filtration. METHODS Hourly blood samples were analyzed from 37 individuals (17 without CKD, 20 with CKD) during 24 h. Creatinine (enzymatic method) and cystatin C were measured using a Cobas 8000 (Roche Diagnostics). eGFR was estimated using the Modification of Diet in Renal Disease and the Chronic Kidney Disease Epidemiology Collaboration based on creatinine and/or cystatin C. Plasma samples were stored at -80 °C before analysis. Outlier and homogeneity analyses were checked before performing a nested ANOVA to determine biological variation. RESULTS CVI of creatinine was higher in people without CKD than in those with CKD (6.4% vs 2.5%) owing primarily to the more profound effect of meat consumption on creatinine variability in individuals with lower baseline creatinine concentrations. Unlike creatinine, cystatin C concentrations were unaffected by meat consumption. Cystatin C showed some diurnal rhythmic variation and less in people with CKD. Reference change values (RCVs) of all eGFR equations were within 13% to 20% in both study groups. CONCLUSIONS Despite differences in CVI of creatinine, the CVI and RCV of the eGFR equations were relatively similar for people with or without CKD.
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Affiliation(s)
- Judith M Hilderink
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Noreen van der Linden
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Dorien M Kimenai
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Elisabeth J R Litjens
- Department of Nephrology, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Lieke J J Klinkenberg
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Breshna M Aref
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Fahra Aziz
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Jeroen P Kooman
- Department of Nephrology, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Roger J M W Rennenberg
- Department of Internal Medicine, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Otto Bekers
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Richard P Koopmans
- Department of Internal Medicine, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Steven J R Meex
- Department of Clinical Chemistry, Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands;
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Estimating Glomerular Filtration Rate in Kidney Transplant Recipients: Comparing a Novel Equation With Commonly Used Equations in this Population. Transplant Direct 2017. [PMID: 29536033 PMCID: PMC5828695 DOI: 10.1097/txd.0000000000000742] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Background Assessment of glomerular filtration rate (GFR) is important in kidney transplantation. The aim was to develop a kidney transplant specific equation for estimating GFR and evaluate against published equations commonly used for GFR estimation in these patients. Methods Adult kidney recipients (n = 594) were included, and blood samples were collected 10 weeks posttransplant. GFR was measured by 51Cr-ethylenediaminetetraacetic acid clearance. Patients were randomized into a reference group (n = 297) to generate a new equation and a test group (n = 297) for comparing it with 7 alternative equations. Results Two thirds of the test group were males. The median (2.5-97.5 percentile) age was 52 (23-75) years, cystatin C, 1.63 (1.00-3.04) mg/L; creatinine, 117 (63-220) μmol/L; and measured GFR, 51 (29-78) mL/min per 1.73 m2. We also performed external evaluation in 133 recipients without the use of trimethoprim, using iohexol clearance for measured GFR. The Modification of Diet in Renal Disease equation was the most accurate of the creatinine-equations. The new equation, estimated GFR (eGFR) = 991.15 × (1.120sex/([age0.097] × [cystatin C0.306] × [creatinine0.527]); where sex is denoted: 0, female; 1, male, demonstrating a better accuracy with a low bias as well as good precision compared with reference equations. Trimethoprim did not influence the performance of the new equation. Conclusions The new equation demonstrated superior accuracy, precision, and low bias. The Modification of Diet in Renal Disease equation was the most accurate of the creatinine-based equations.
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Shardlow A, McIntyre NJ, Fraser SDS, Roderick P, Raftery J, Fluck RJ, McIntyre CW, Taal MW. The clinical utility and cost impact of cystatin C measurement in the diagnosis and management of chronic kidney disease: A primary care cohort study. PLoS Med 2017; 14:e1002400. [PMID: 29016597 PMCID: PMC5634538 DOI: 10.1371/journal.pmed.1002400] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Accepted: 09/01/2017] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND To reduce over-diagnosis of chronic kidney disease (CKD) resulting from the inaccuracy of creatinine-based estimates of glomerular filtration rate (GFR), UK and international guidelines recommend that cystatin-C-based estimates of GFR be used to confirm or exclude the diagnosis in people with GFR 45-59 ml/min/1.73 m2 and no albuminuria (CKD G3aA1). Whilst there is good evidence for cystatin C being a marker of GFR and risk in people with CKD, its use to define CKD in this manner has not been evaluated in primary care, the setting in which most people with GFR in this range are managed. METHODS AND FINDINGS A total of 1,741 people with CKD G3a or G3b defined by 2 estimated GFR (eGFR) values more than 90 days apart were recruited to the Renal Risk in Derby study between June 2008 and March 2010. Using Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equations, we compared GFR estimated from creatinine (eGFRcreat), cystatin C (eGFRcys), and both (eGFRcreat-cys) at baseline and over 5 years of follow-up. We analysed the proportion of participants with CKD G3aA1 reclassified to 'no CKD' or more advanced CKD with the latter two equations. We further assessed the impact of using cystatin-C-based eGFR in risk prediction equations for CKD progression and all-cause mortality and investigated non-GFR determinants of eGFRcys. Finally, we estimated the cost implications of implementing National Institute for Health and Care Excellence (NICE) guidance to use eGFRcys to confirm the diagnosis in people classified as CKD G3aA1 by eGFRcreat. Mean eGFRcys was significantly lower than mean eGFRcreat (45.1 ml/min/1.73 m2, 95% CI 44.4 to 45.9, versus 53.6 ml/min/1.73 m2, 95% CI 53.0 to 54.1, P < 0.001). eGFRcys reclassified 7.7% (50 of 653) of those with CKD G3aA1 by eGFRcreat to eGFR ≥ 60 ml/min/1.73 m2. However, a much greater proportion (59.0%, 385 of 653) were classified to an eGFR category indicating more severe CKD. A similar pattern was seen using eGFRcreat-cys, but lower proportions were reclassified. Change in eGFRcreat and eGFRcys over 5 years were weakly correlated (r = 0.33, P < 0.001), but eGFRcys identified more people as having CKD progression (18.2% versus 10.5%). Multivariable analysis using eGFRcreat as an independent variable identified age, smoking status, body mass index, haemoglobin, serum uric acid, serum albumin, albuminuria, and C reactive protein as non-GFR determinants of eGFRcys. Use of eGFRcys or eGFRcreat-cys did not improve discrimination in risk prediction models for CKD progression and all-cause mortality compared to similar models with eGFRcreat. Application of the NICE guidance, which assumed cost savings, to participants with CKD G3aA1 increased the cost of monitoring by £23 per patient, which if extrapolated to be applied throughout England would increase the cost of testing and monitoring CKD by approximately £31 million per year. Limitations of this study include the lack of a measured GFR and the potential lack of ethnic diversity in the study cohort. CONCLUSIONS Implementation of current guidelines on eGFRcys testing in our study population of older people in primary care resulted in only a small reduction in diagnosed CKD but classified a greater proportion as having more advanced CKD than eGFRcreat. Use of eGFRcys did not improve risk prediction in this population and was associated with increased cost. Our data therefore do not support implementation of these recommendations in primary care. Further studies are warranted to define the most appropriate clinical application of eGFRcys and eGFRcreat-cys.
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Affiliation(s)
- Adam Shardlow
- Renal Unit, Royal Derby Hospital, Derby, United Kingdom
- Centre for Kidney Research and Innovation, Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, University of Nottingham, Royal Derby Hospital, Derby, United Kingdom
| | - Natasha J. McIntyre
- Centre for Kidney Research and Innovation, Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, University of Nottingham, Royal Derby Hospital, Derby, United Kingdom
| | - Simon D. S. Fraser
- Academic Unit of Primary Care and Population Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Paul Roderick
- Academic Unit of Primary Care and Population Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - James Raftery
- Academic Unit of Primary Care and Population Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | | | - Christopher W. McIntyre
- Division of Nephrology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Maarten W. Taal
- Renal Unit, Royal Derby Hospital, Derby, United Kingdom
- Centre for Kidney Research and Innovation, Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, University of Nottingham, Royal Derby Hospital, Derby, United Kingdom
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Shardlow A, McIntyre NJ, Fluck RJ, McIntyre CW, Taal MW. Associations of fibroblast growth factor 23, vitamin D and parathyroid hormone with 5-year outcomes in a prospective primary care cohort of people with chronic kidney disease stage 3. BMJ Open 2017; 7:e016528. [PMID: 28838895 PMCID: PMC5629682 DOI: 10.1136/bmjopen-2017-016528] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVES Vitamin D deficiency, elevated fibroblast growth factor 23 (FGF23) and elevated parathyroid hormone (PTH) have each been associated with increased mortality in people with chronic kidney disease (CKD). Previous studies have focused on the effects of FGF23 in relatively advanced CKD. This study aims to assess whether FGF23 is similarly a risk factor in people with early CKD, and how this risk compares to that associated with vitamin D deficiency or elevated PTH. DESIGN Prospective cohort study. SETTING Thirty-two primary care practices. PARTICIPANTS One thousand six hundred and sixty-four people who met Kidney Disease: Improving Global Outcomes (KDIGO) definitions for CKD stage 3 (two measurements of estimated glomerular filtration rate (eGFR) between 30 and 60 mL/min/1.73 m2 at least 90 days apart) prior to study recruitment. OUTCOME MEASURES All-cause mortality over the period of study follow-up and progression of CKD defined as a 25% fall in eGFR and a drop in GFR category, or an increase in albuminuria category. RESULTS Two hundred and eighty-nine participants died during the follow-up period. Vitamin D deficiency (HR 1.62, 95% CI 1.01 to 2.58) and elevated PTH (HR 1.42, 95% CI 1.09 to 1.84) were independently associated with all-cause mortality. FGF23 was associated with all-cause mortality in univariable but not multivariable analysis. Fully adjusted multivariable models of CKD progression showed no association with FGF23, vitamin D status or PTH. CONCLUSIONS In this cohort of predominantly older people with CKD stage 3 and low risk of progression, vitamin D deficiency and elevated PTH were independent risk factors for all-cause mortality but elevated FGF23 was not. While FGF23 may have a role as a risk marker in high-risk populations managed in secondary care, our data suggest that it may not be as important in CKD stage 3, managed in primary care. TRIAL REGISTRATION NUMBER National Institute for Health Research Clinical Research Portfolio Study Number 6632.
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Affiliation(s)
- Adam Shardlow
- Renal Medicine, Royal Derby Hospital, Derby, UK
- Division of Medical Sciences and Graduate Entry Medicine, Centre for Kidney Research and Innovation, School of Medicine, The University of Nottingham, Royal Derby Hospital, Derby, UK
| | | | | | - Christopher W McIntyre
- Division of Nephrology, Schulich School of Medicine and Dentistry University of Western Ontario, London, Ontario, Canada
| | - Maarten W Taal
- Renal Medicine, Royal Derby Hospital, Derby, UK
- Division of Medical Sciences and Graduate Entry Medicine, Centre for Kidney Research and Innovation, School of Medicine, The University of Nottingham, Royal Derby Hospital, Derby, UK
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30
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Nusshag C, Weigand MA, Zeier M, Morath C, Brenner T. Issues of Acute Kidney Injury Staging and Management in Sepsis and Critical Illness: A Narrative Review. Int J Mol Sci 2017; 18:E1387. [PMID: 28657585 PMCID: PMC5535880 DOI: 10.3390/ijms18071387] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 06/24/2017] [Accepted: 06/24/2017] [Indexed: 12/19/2022] Open
Abstract
Acute kidney injury (AKI) has a high incidence on intensive care units around the world and is a major complication in critically ill patients suffering from sepsis or septic shock. The short- and long-term complications are thereby devastating and impair the quality of life. Especially in terms of AKI staging, the determination of kidney function and the timing of dialytic AKI management outside of life-threatening indications are ongoing matters of debate. Despite several studies, a major problem remains in distinguishing between beneficial and unnecessary "early" or even harmful renal replacement therapy (RRT). The latter might prolong disease course and renal recovery. AKI scores, however, provide an insufficient outcome-predicting ability and the related estimation of kidney function via serum creatinine or blood urea nitrogen (BUN)/urea is not reliable in AKI and critical illness. Kidney independent alterations of creatinine- and BUN/urea-levels further complicate the situation. This review critically assesses the current AKI staging, issues and pitfalls of the determination of kidney function and RRT timing, as well as the potential harm reflected by unnecessary RRT. A better understanding is mandatory to improve future study designs and avoid unnecessary RRT for higher patient safety and lower health care costs.
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Affiliation(s)
- Christian Nusshag
- Department of Nephrology, Heidelberg University Hospital, 162, Im Neuenheimer Feld, D-69120 Heidelberg, Germany.
| | - Markus A Weigand
- Department of Anesthesiology, Heidelberg University Hospital, 110, Im Neuenheimer Feld, D-69120 Heidelberg, Germany.
| | - Martin Zeier
- Department of Nephrology, Heidelberg University Hospital, 162, Im Neuenheimer Feld, D-69120 Heidelberg, Germany.
| | - Christian Morath
- Department of Nephrology, Heidelberg University Hospital, 162, Im Neuenheimer Feld, D-69120 Heidelberg, Germany.
| | - Thorsten Brenner
- Department of Anesthesiology, Heidelberg University Hospital, 110, Im Neuenheimer Feld, D-69120 Heidelberg, Germany.
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Association between dietary patterns, cadmium intake and chronic kidney disease among adults. Clin Nutr 2017; 37:276-284. [PMID: 28094058 DOI: 10.1016/j.clnu.2016.12.025] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 12/01/2016] [Accepted: 12/28/2016] [Indexed: 11/22/2022]
Abstract
BACKGROUND & AIMS Almost one in ten Chinese adults has chronic kidney disease (CKD). However, the link between dietary patterns, dietary cadmium intake and CKD has not been studied in China. METHOD Adults (n = 8429) in the China Health and Nutrition Survey who had at least one 3-day 24 h food record in combination with household food inventory in 1991, 1993, 1997, 2000, 2004, 2006, and 2009 and estimated glomerular filtration rate (eGFR) measured in 2009. Dietary pattern was identified using factor analysis. CKD was defined as eGFR <60 mL/min/1.73 m2. RESULTS There were 641 (7.6%) cases of CKD in the sample. After adjustment for demographic, lifestyle factors (i.e. smoking, alcohol drinking, physical activity) and chronic conditions, the odds ratio (OR) for CKD was 4.05 (95%CI 2.91-5.63, p for trend <0.001) for extreme quartiles of estimated cumulative cadmium intake. A traditional southern dietary pattern (high intake of rice, pork, and vegetables, and low intake of wheat) was associated with more than four times increased prevalence of CKD (comparing extreme quartiles, OR 4.56, 95%CI 3.18-6.56). A modern dietary pattern (high intake of fruit, soy milk, egg, milk and deep fried products) was inversely associated with CKD (for extreme quartiles, OR 0.5, 95%CI 0.36-0.71). The association between dietary patterns and CKD were attenuated by cadmium intake. CONCLUSION Traditional southern dietary pattern is positively associated, and modern dietary pattern is inversely associated, with CKD among Chinese adults. However, these associations can be partly attributed to cadmium contamination in parts of the food supply.
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Sagou Yayo É, Aye M, Konan JL, Emième A, Attoungbre ML, Gnionsahé A, Cavalier É, Monnet D, Delanaye P. Inadéquation du facteur ethnique pour l’estimation du débit de filtration glomérulaire en population générale noire-africaine : résultats en Côte d’Ivoire. Nephrol Ther 2016; 12:454-459. [DOI: 10.1016/j.nephro.2016.03.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 03/22/2016] [Indexed: 10/20/2022]
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Shardlow A, McIntyre NJ, Fluck RJ, McIntyre CW, Taal MW. Chronic Kidney Disease in Primary Care: Outcomes after Five Years in a Prospective Cohort Study. PLoS Med 2016; 13:e1002128. [PMID: 27648564 PMCID: PMC5029805 DOI: 10.1371/journal.pmed.1002128] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 08/12/2016] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Chronic kidney disease (CKD) is commonly managed in primary care, but most guidelines have a secondary care perspective emphasizing the risk of end-stage kidney disease (ESKD) and need for renal replacement therapy. In this prospective cohort study, we sought to study in detail the natural history of CKD in primary care to better inform the appropriate emphasis for future guidance. METHODS AND FINDINGS In this study, 1,741 people with CKD stage 3 were individually recruited from 32 primary care practices in Derbyshire, United Kingdom. Study visits were undertaken at baseline, year 1, and year 5. Binomial logistic regression and Cox proportional hazards models were used to model progression, CKD remission, and all-cause mortality. We used Kidney Disease: Improving Global Outcomes (KDIGO) criteria to define CKD progression and defined CKD remission as the absence of diagnostic criteria (estimated glomerular filtration rate [eGFR] >60 ml/min/1.73 m2 and urine albumin-to-creatinine ratio [uACR] <3 mg/mmol) at any study visit. Participants were predominantly elderly (mean ± standard deviation (SD) age 72.9 ± 9.0 y), with relatively mild reduction in GFR (mean ± SD eGFR 53.5 ± 11.8 mL/min/1,73 m2) and a low prevalence of albuminuria (16.9%). After 5 y, 247 participants (14.2%) had died, most of cardiovascular causes. Only 4 (0.2%) developed ESKD, but 308 (17.7%) evidenced CKD progression by KDIGO criteria. Stable CKD was observed in 593 participants (34.1%), and 336 (19.3%) met the criteria for remission. Remission at baseline and year 1 was associated with a high likelihood of remission at year 5 (odds ratio [OR] = 23.6, 95% CI 16.5-33.9 relative to participants with no remission at baseline and year 1 study visits). Multivariable analyses confirmed eGFR and albuminuria as key risk factors for predicting adverse as well as positive outcomes. Limitations of this study include reliance on GFR estimated using the Modification of Diet in Renal Disease study (MDRD) equation for recruitment (but not subsequent analysis) and a study population that was predominantly elderly and white, implying that the results may not be directly applicable to younger populations of more diverse ethnicity. CONCLUSIONS Management of CKD in primary care should focus principally on identifying the minority of people at high risk of adverse outcomes, to allow intervention to slow CKD progression and reduce cardiovascular events. Efforts should also be made to identify and reassure the majority who are at low risk of progression to ESKD. Consideration should be given to adopting an age-calibrated definition of CKD to avoid labelling a large group of people with age-related decline in GFR and low associated risk as having CKD.
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Affiliation(s)
- Adam Shardlow
- Renal Unit, Royal Derby Hospital, Derby, United Kingdom.,Centre for Kidney Research and Innovation, Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, The University of Nottingham, Royal Derby Hospital, Derby, United Kingdom
| | | | | | - Christopher W McIntyre
- Division of Nephrology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Maarten W Taal
- Renal Unit, Royal Derby Hospital, Derby, United Kingdom.,Centre for Kidney Research and Innovation, Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, The University of Nottingham, Royal Derby Hospital, Derby, United Kingdom
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Relford R, Robertson J, Clements C. Symmetric Dimethylarginine: Improving the Diagnosis and Staging of Chronic Kidney Disease in Small Animals. Vet Clin North Am Small Anim Pract 2016; 46:941-60. [PMID: 27499007 DOI: 10.1016/j.cvsm.2016.06.010] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Chronic kidney disease (CKD) is a common condition in cats and dogs, traditionally diagnosed after substantial loss of kidney function when serum creatinine concentrations increase. Symmetric dimethylarginine (SDMA) is a sensitive circulating kidney biomarker whose concentrations increase earlier than creatinine as glomerular filtration rate decreases. Unlike creatinine SDMA is unaffected by lean body mass. The IDEXX SDMA test introduces a clinically relevant and reliable tool for the diagnosis and management of kidney disease. SDMA has been provisionally incorporated into the International Renal Interest Society guidelines for CKD to aid staging and targeted treatment of early and advanced disease.
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Affiliation(s)
- Roberta Relford
- Companion Animal Group Medical Organization, IDEXX, 1 IDEXX Drive, Westbrook, ME 04092, USA
| | - Jane Robertson
- Companion Animal Group Medical Organization, IDEXX, 1 IDEXX Drive, Westbrook, ME 04092, USA
| | - Celeste Clements
- Companion Animal Group Medical Organization, IDEXX, 1 IDEXX Drive, Westbrook, ME 04092, USA.
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Yerramilli M, Farace G, Quinn J, Yerramilli M. Kidney Disease and the Nexus of Chronic Kidney Disease and Acute Kidney Injury: The Role of Novel Biomarkers as Early and Accurate Diagnostics. Vet Clin North Am Small Anim Pract 2016; 46:961-93. [PMID: 27485279 DOI: 10.1016/j.cvsm.2016.06.011] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chronic kidney disease (CKD) and acute kidney injury (AKI) are interconnected and the presence of one is a risk for the other. CKD is an important predictor of AKI after exposure to nephrotoxic drugs or major surgery, whereas persistent or repetitive injury could result in the progression of CKD. This brings new perspectives to the diagnosis and monitoring of kidney diseases highlighting the need for a panel of kidney-specific biomarkers that reflect functional as well as structural damage and recovery, predict potential risk and provide prognosis. This article discusses the kidney-specific biomarkers, symmetric dimethylarginine (SDMA), clusterin, cystatin B, and inosine.
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Affiliation(s)
- Murthy Yerramilli
- IDEXX Laboratories, Research & Development, 1-IDEXX Drive, Westbrook, ME 04092, USA.
| | - Giosi Farace
- IDEXX Laboratories, Research & Development, 1-IDEXX Drive, Westbrook, ME 04092, USA
| | - John Quinn
- IDEXX Laboratories, Research & Development, 1-IDEXX Drive, Westbrook, ME 04092, USA
| | - Maha Yerramilli
- IDEXX Laboratories, Research & Development, 1-IDEXX Drive, Westbrook, ME 04092, USA
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Ghys L, Paepe D, Lefebvre H, Taffin E, Hesta M, Delanghe J, Smets P, Vandendriessche V, Daminet S. The effect of feeding, storage and anticoagulant on feline serum cystatin C. Vet J 2015; 206:91-6. [DOI: 10.1016/j.tvjl.2015.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 05/18/2015] [Accepted: 07/01/2015] [Indexed: 11/16/2022]
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Bankir L, Roussel R, Bouby N. Protein- and diabetes-induced glomerular hyperfiltration: role of glucagon, vasopressin, and urea. Am J Physiol Renal Physiol 2015; 309:F2-23. [DOI: 10.1152/ajprenal.00614.2014] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 04/13/2015] [Indexed: 12/21/2022] Open
Abstract
A single protein-rich meal (or an infusion of amino acids) is known to increase the glomerular filtration rate (GFR) for a few hours, a phenomenon known as “hyperfiltration.” It is important to understand the factors that initiate this upregulation because it becomes maladaptive in the long term. Several mediators and paracrine factors have been shown to participate in this upregulation, but they are not directly triggered by protein intake. Here, we explain how a rise in glucagon and in vasopressin secretion, directly induced by protein ingestion, might be the initial factors triggering the hepatic and renal events leading to an increase in the GFR. Their effects include metabolic actions in the liver and stimulation of sodium chloride reabsorption in the thick ascending limb. Glucagon is not only a glucoregulatory hormone. It is also important for the excretion of nitrogen end products by stimulating both urea synthesis in the liver (along with gluconeogenesis from amino acids) and urea excretion by the kidney. Vasopressin allows the concentration of nitrogenous end products (urea, ammonia, etc.) and other protein-associated wastes in a hyperosmotic urine, thus allowing a very significant water economy characteristic of all terrestrial mammals. No hyperfiltration occurs in the absence of one or the other hormone. Experimental results suggest that the combined actions of these two hormones, along with the complex intrarenal handling of urea, lead to alter the composition of the tubular fluid at the macula densa and to reduce the intensity of the signal activating the tubuloglomerular feedback control of GFR, thus allowing GFR to raise. Altogether, glucagon, vasopressin, and urea contribute to set up the best compromise between efficient urea excretion and water economy.
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Affiliation(s)
- Lise Bankir
- INSERM UMRS 1138, Centre de Recherche des Cordeliers, Paris, France
- Université Paris Diderot, Sorbonne-Paris-Cité, Paris, France; and
| | - Ronan Roussel
- INSERM UMRS 1138, Centre de Recherche des Cordeliers, Paris, France
- Université Paris Diderot, Sorbonne-Paris-Cité, Paris, France; and
- Diabétologie Endocrinologie Nutrition, DHU FIRE, Hôpital Bichat, AP-HP, Paris, France
| | - Nadine Bouby
- INSERM UMRS 1138, Centre de Recherche des Cordeliers, Paris, France
- Université Paris Diderot, Sorbonne-Paris-Cité, Paris, France; and
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Lopez-Giacoman S, Madero M. Biomarkers in chronic kidney disease, from kidney function to kidney damage. World J Nephrol 2015; 4:57-73. [PMID: 25664247 PMCID: PMC4317628 DOI: 10.5527/wjn.v4.i1.57] [Citation(s) in RCA: 194] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 10/21/2014] [Accepted: 11/10/2014] [Indexed: 02/06/2023] Open
Abstract
Chronic kidney disease (CKD) typically evolves over many years, with a long latent period when the disease is clinically silent and therefore diagnosis, evaluation and treatment is based mainly on biomarkers that assess kidney function. Glomerular filtration rate (GFR) remains the ideal marker of kidney function. Unfortunately measuring GFR is time consuming and therefore GFR is usually estimated from equations that take into account endogenous filtration markers like serum creatinine (SCr) and cystatin C (CysC). Other biomarkers such as albuminuria may precede kidney function decline and have demonstrated to have strong associations with disease progression and outcomes. New potential biomarkers have arisen with the promise of detecting kidney damage prior to the currently used markers. The aim of this review is to discuss the utility of the GFR estimating equations and biomarkers in CKD and the different clinical settings where these should be applied. The CKD-Epidemiology Collaboration equation performs better than the modification of diet in renal disease equation, especially at GFR above 60 mL/min per 1.73 m2. Equations combining CysC and SCr perform better than the equations using either CysC or SCr alone and are recommended in situations where CKD needs to be confirmed. Combining creatinine, CysC and urine albumin to creatinine ratio improves risk stratification for kidney disease progression and mortality. Kidney injury molecule and neutrophil gelatinase-associated lipocalin are considered reasonable biomarkers in urine and plasma to determine severity and prognosis of CKD.
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Moorthi RN, Armstrong CLH, Janda K, Ponsler-Sipes K, Asplin JR, Moe SM. The effect of a diet containing 70% protein from plants on mineral metabolism and musculoskeletal health in chronic kidney disease. Am J Nephrol 2015; 40:582-91. [PMID: 25613675 DOI: 10.1159/000371498] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 12/12/2014] [Indexed: 12/22/2022]
Abstract
BACKGROUND Chronic Kidney Disease (CKD) is associated with alterations in phosphorus excretion, and increases in fibroblast growth factor (FGF23) and parathyroid hormone (PTH). Plant protein-based phytate-bound phosphorus, is less bioavailable than that from animal sources. Our one-week study that was conducted previously showed that a nearly 100% plant protein-based diet benefits mineral metabolism in CKD; however, this diet may not be acceptable to patients. Here we hypothesize that a diet containing 70% protein from plants has similar efficacy and is tolerated by CKD patients. METHODS Thirteen subjects with CKD 3-4 received an omnivorous diet containing 70% protein from plants for 4 weeks. The primary outcome was change in 24 h urine phosphorus. Secondary outcomes were changes in serum phosphorus, FGF23, PTH, urine sodium excretion, grip strength and fat free mass. Repeated measures analysis of variance (ANOVA) was used to test differences in parameters over the 4 weeks. RESULTS Mean age of subjects was 54.8 years. Median eGFR was 26 (IQR 14.7) ml/min/1.73 m(2). Over the 4-week period, urine phosphorus significantly decreased by 215 ± 232 mg/day (p < 0.001). No significant changes in serum FGF23, phosphorus or PTH were noted. Urine sodium and titratable acid decreased significantly on the diet. Hand grip strength and fat-free mass did not change. There were two hyperkalemia events both 5.8 mEq/l, corrected by food substitutions. No other adverse events were observed. CONCLUSIONS A 70% plant protein diet is safe, tolerated, and efficacious in lowering urine phosphorus excretion and may be an alternative to phosphate binders.
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Affiliation(s)
- Ranjani N Moorthi
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Ind., USA
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40
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The definition of acute kidney injury and its use in practice. Kidney Int 2014; 87:62-73. [PMID: 25317932 DOI: 10.1038/ki.2014.328] [Citation(s) in RCA: 420] [Impact Index Per Article: 42.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 02/24/2014] [Accepted: 02/27/2014] [Indexed: 01/04/2023]
Abstract
Acute kidney injury (AKI) is a common syndrome that is independently associated with increased mortality. A standardized definition is important to facilitate clinical care and research. The definition of AKI has evolved rapidly since 2004, with the introduction of the Risk, Injury, Failure, Loss, and End-stage renal disease (RIFLE), AKI Network (AKIN), and Kidney Disease Improving Global Outcomes (KDIGO) classifications. RIFLE was modified for pediatric use (pRIFLE). They were developed using both evidence and consensus. Small rises in serum creatinine are independently associated with increased mortality, and hence are incorporated into the current definition of AKI. The recent definition from the international KDIGO guideline merged RIFLE and AKIN. Systematic review has found that these definitions do not differ significantly in their performance. Health-care staff caring for children or adults should use standard criteria for AKI, such as the pRIFLE or KDIGO definitions, respectively. These efforts to standardize AKI definition are a substantial advance, although areas of uncertainty remain. The new definitions have enabled the use of electronic alerts to warn clinicians of possible AKI. Novel biomarkers may further refine the definition of AKI, but their use will need to produce tangible improvements in outcomes and cost effectiveness. Further developments in AKI definitions should be informed by research into their practical application across health-care providers. This review will discuss the definition of AKI and its use in practice for clinicians and laboratory scientists.
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Tak YJ, Lee JG, Song SH, Kim YJ, Lee S, Jung DW, Yi YH, Cho YH, Choi EJ, Hwang HR. The relationship between the level of serum 25-hydroxyvitamin D and renal function in patients without chronic kidney disease: a cross-sectional study. J Ren Nutr 2014; 25:88-96. [PMID: 25238696 DOI: 10.1053/j.jrn.2014.07.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 07/10/2014] [Accepted: 07/21/2014] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVES Low level of vitamin D has been suggested as a risk factor for chronic kidney disease (CKD). However, little is known about the effect of vitamin D on renal function in healthy subjects. Our aim was to investigate the question of whether vitamin D status is associated with renal function in subjects without CKD. METHODS In this cross-sectional study, 1,648 subjects aged older than 20 years were recruited as study participants. Subjects diagnosed with either CKD or other conditions that could influence serum vitamin D were excluded. Estimated glomerular filtration rate (eGFR) from serum creatinine (sCr) was used for the determination of renal function. Vitamin D status was determined by the measurement of serum 25-hydroxyvitamin D [25(OH)D] levels. RESULTS In men, 25(OH)D showed significant positive correlation with age (r = 0.127, P < .001), skeletal muscle mass (r = 0.077, P = .017), sCr (r = 0.128, P < .001), and negative correlation with body fat (r = -0.065, P = .044), eGFR (r = -0.152, P < .001). In women, 25(OH)D showed negative correlation with eGFR (r = -0.085, P = .026), but not with age and body composition. In multiple linear regression analysis, 25(OH)D (β = 0.114, P < .001), total muscle mass (β = 0.202, P = .026), and age (β = 0.117, P = .003) were an independent determinant of sCr in men; in women, 25(OH)D (β = 0.086, P = .023), total muscle mass (β = 0.152, P < .001) were variables showing significant association with sCr. CONCLUSIONS Higher level of 25(OH)D is independently associated with sCr elevation. We suggest that a positive correlation between 25(OH)D and muscle mass could be attributed to sCr. It is thought to be another mechanism of serum 25(OH)D level in renal function in populations without CKD.
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Affiliation(s)
- Young Jin Tak
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Jeong Gyu Lee
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea.
| | - Sang Heon Song
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea; Department of Internal Medicine, Pusan National University School of Medicine, Busan, Republic of Korea
| | - Yun Jin Kim
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Sangyeoup Lee
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea; Medical Education Unit, Pusan National University School of Medicine, Yangsan, Republic of Korea
| | - Dong Wook Jung
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea
| | - Yu Hyeon Yi
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Young Hye Cho
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea
| | - Eun Jung Choi
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea
| | - Hye Rim Hwang
- Department of Family Medicine, Pusan National University School of Medicine, Busan, Republic of Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
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Ghys L, Paepe D, Smets P, Lefebvre H, Delanghe J, Daminet S. Cystatin C: a new renal marker and its potential use in small animal medicine. J Vet Intern Med 2014; 28:1152-64. [PMID: 24814357 PMCID: PMC4857948 DOI: 10.1111/jvim.12366] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 02/27/2014] [Accepted: 03/18/2014] [Indexed: 01/01/2023] Open
Abstract
The occurrence of chronic kidney disease is underestimated in both human and veterinary medicine. Glomerular filtration rate (GFR) is considered the gold standard for evaluating kidney function. However, GFR assessment is time-consuming and labor-intensive and therefore not routinely used in practice. The commonly used indirect GFR markers, serum creatinine (sCr) and urea, are not sufficiently sensitive or specific to detect early renal dysfunction. Serum cystatin C (sCysC), a proteinase inhibitor, has most of the properties required for an endogenous GFR marker. In human medicine, numerous studies have evaluated its potential use as a GFR marker in several populations. In veterinary medicine, this marker is gaining interest. The measurement is easy, which makes it an interesting parameter for clinical use. This review summarizes current knowledge about cystatin C (CysC) in humans, dogs, and cats, including its history, assays, relationship with GFR, and biological and clinical variations in both human and veterinary medicine.
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Affiliation(s)
- L. Ghys
- Department of Medicine and Clinical Biology of Small AnimalsFaculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
| | - D. Paepe
- Department of Medicine and Clinical Biology of Small AnimalsFaculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
| | - P. Smets
- Department of Medicine and Clinical Biology of Small AnimalsFaculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
| | - H. Lefebvre
- Clinical Research UnitNational Veterinary School of ToulouseToulouse Cedex 3France
| | - J. Delanghe
- Department of Clinical Chemistry, Microbiology and ImmunologyFaculty of Health Medicine and Life SciencesGhent UniversityGhentBelgium
| | - S. Daminet
- Department of Medicine and Clinical Biology of Small AnimalsFaculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
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Grubb A, Horio M, Hansson LO, Björk J, Nyman U, Flodin M, Larsson A, Bökenkamp A, Yasuda Y, Blufpand H, Lindström V, Zegers I, Althaus H, Blirup-Jensen S, Itoh Y, Sjöström P, Nordin G, Christensson A, Klima H, Sunde K, Hjort-Christensen P, Armbruster D, Ferrero C. Generation of a new cystatin C-based estimating equation for glomerular filtration rate by use of 7 assays standardized to the international calibrator. Clin Chem 2014; 60:974-86. [PMID: 24829272 DOI: 10.1373/clinchem.2013.220707] [Citation(s) in RCA: 206] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Many different cystatin C-based equations exist for estimating glomerular filtration rate. Major reasons for this are the previous lack of an international cystatin C calibrator and the nonequivalence of results from different cystatin C assays. METHODS Use of the recently introduced certified reference material, ERM-DA471/IFCC, and further work to achieve high agreement and equivalence of 7 commercially available cystatin C assays allowed a substantial decrease of the CV of the assays, as defined by their performance in an external quality assessment for clinical laboratory investigations. By use of 2 of these assays and a population of 4690 subjects, with large subpopulations of children and Asian and Caucasian adults, with their GFR determined by either renal or plasma inulin clearance or plasma iohexol clearance, we attempted to produce a virtually assay-independent simple cystatin C-based equation for estimation of GFR. RESULTS We developed a simple cystatin C-based equation for estimation of GFR comprising only 2 variables, cystatin C concentration and age. No terms for race and sex are required for optimal diagnostic performance. The equation, [Formula: see text] is also biologically oriented, with 1 term for the theoretical renal clearance of small molecules and 1 constant for extrarenal clearance of cystatin C. CONCLUSIONS A virtually assay-independent simple cystatin C-based and biologically oriented equation for estimation of GFR, without terms for sex and race, was produced.
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Affiliation(s)
- Anders Grubb
- Department of Clinical Chemistry, Laboratory Medicine, University Hospital, Lund, Sweden;
| | - Masaru Horio
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | | | - Jonas Björk
- Department of Occupational and Environmental Medicine, Lund University, Lund, Sweden
| | - Ulf Nyman
- Department of Radiology, Central Hospital, Kristianstad, University of Lund, Sweden
| | - Mats Flodin
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Anders Larsson
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Arend Bökenkamp
- Department of Pediatric Nephrology, VU University Medical Center, Amsterdam, The Netherlands
| | - Yoshinari Yasuda
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hester Blufpand
- Department of Pediatric Nephrology, VU University Medical Center, Amsterdam, The Netherlands
| | - Veronica Lindström
- Department of Clinical Chemistry, Laboratory Medicine, University Hospital, Lund, Sweden
| | - Ingrid Zegers
- Institute for Reference Materials and Measurements, Joint Research Centre, European Commission, Geel, Belgium
| | - Harald Althaus
- Siemens Healthcare Diagnostics Products GmbH, Marburg, Germany
| | - Søren Blirup-Jensen
- Department of Clinical Chemistry, Laboratory Medicine, University Hospital, Lund, Sweden
| | - Yoshi Itoh
- Department of Laboratory Medicine, EIJU, General Hospital, Tokyo, Japan
| | - Per Sjöström
- Department of Medicine, Örebro University Hospital, Örebro, Sweden
| | | | - Anders Christensson
- Department of Nephrology and Transplantation, Skåne University Hospital, Lund, Sweden
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Erlandsen EJ, Abrahamsen J. The influence of the gastrointestinal tract and the liver on cystatin C serum concentrations. Scand J Clin Lab Invest 2014; 74:447-53. [PMID: 24734782 DOI: 10.3109/00365513.2014.900699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The purpose of this study in humans was to examine the influence of the gastrointestinal tract and liver on the serum concentrations of cystatin C. METHODS Eighteen healthy volunteers and 28 patients suspected of having chronic intestinal ischemia underwent catheterization of the abdominal aorta and the central hepatic vein. Blood samples were taken simultaneously from the abdominal aorta and the central hepatic vein 60, 90 and 120 minutes after the start of the investigation. After the first blood sample, a standard liquid meal was ingested. Measurement of splanchnic blood flow was performed using the Fick principle with constant infusion of (99m)Tc-Bridatec. Angiography was performed at the end of the investigation. RESULTS The splanchnic blood flow increased significantly postprandially in the healthy volunteers and in the patients with normal angiography by 0.613-0.698 L/min and increased non- significantly in the patients with abnormal angiography (n = 5) by 0.135 L/min on average. ANOVA and the Bonferroni's multiple comparison test showed no significant difference between the means of cystatin C, creatinine or urea in the samples taken 60, 90 and 120 minutes after the start of the investigation in the abdominal aorta and the hepatic vein in the healthy volunteers or in the patients suspected of chronic intestinal ischemia with normal angiography. CONCLUSION There was no indication of hepatic elimination of cystatin C, creatinine or urea. The serum concentrations of cystatin C, creatinine and urea in the central hepatic vein and the abdominal aorta were independent of the splanchnic blood flow.
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Affiliation(s)
- Erland J Erlandsen
- Department of Clinical Biochemistry, Viborg Regional Hospital , Viborg , Denmark
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Nair S, O'Brien SV, Hayden K, Pandya B, Lisboa PJG, Hardy KJ, Wilding JPH. Effect of a cooked meat meal on serum creatinine and estimated glomerular filtration rate in diabetes-related kidney disease. Diabetes Care 2014; 37:483-7. [PMID: 24062331 DOI: 10.2337/dc13-1770] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Fasting is not routinely recommended for renal function tests, despite the known effects of cooked meat on creatinine. We therefore studied variation in creatinine and estimated glomerular filtration rate (eGFR) after a standardized cooked meat meal in 80 subjects: healthy volunteers and diabetic patients with chronic kidney disease (CKD) stages 1 and 2, 3a, 3b, and 4 (n = 16/group). RESEARCH DESIGN AND METHODS The interventions were a standardized cooked meat and a nonmeat meal, each providing ∼54 g protein, together with 250 mL water, on separate days. Fasting and postprandial blood samples at 1, 2, and 4 h were drawn for creatinine measurement using a kinetic alkaline picrate assay on an Olympus AU640 analyzer. The modified four-variable Modification of Diet in Renal Disease equation traceable to isotope dilution mass spectrometry creatinine was used to calculate eGFR. RESULTS Consumption of a standardized cooked meat meal significantly increased serum creatinine and resulted in significant fall in eGFR in all stages of CKD studied; 6 of 16 CKD 3a patients were misclassified as CKD 3b. This effect of cooked meat on serum creatinine disappears after 12 h of fasting in all study participants. CONCLUSIONS Creatine in meat is converted to creatinine on cooking, which is absorbed, causing significant increases in serum creatinine. This could impact management, as threshold for commencing and withdrawing certain medications and expensive investigations is defined by eGFR. eGFR calculated using fasting serum creatinine would be a better reflection of kidney function in these patients.
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Friedman AN, Moe S, Fadel WF, Inman M, Mattar SG, Shihabi Z, Quinney SK. Predicting the glomerular filtration rate in bariatric surgery patients. Am J Nephrol 2013; 39:8-15. [PMID: 24356416 PMCID: PMC3945154 DOI: 10.1159/000357231] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 11/12/2013] [Indexed: 12/14/2022]
Abstract
BACKGROUND/AIMS Identifying the best method to estimate the glomerular filtration rate (GFR) in bariatric surgery patients has important implications for the clinical care of obese patients and research into the impact of obesity and weight reduction on kidney health. We therefore performed such an analysis in patients before and after surgical weight loss. METHODS Fasting measured GFR (mGFR) by plasma iohexol clearance before and after bariatric surgery was obtained in 36 severely obese individuals. Estimated GFR was calculated using the Modification of Diet in Renal Disease equation, the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation using serum creatinine only, the CKD-EPI equation using serum cystatin C only and a recently derived equation that uses both serum creatinine and cystatin C (CKD-EPIcreat-cystC) and then compared to mGFR. RESULTS Participants were primarily middle-aged white females with a mean baseline body mass index of 46 ± 9, serum creatinine of 0.81 ± 0.24 mg/dl and mGFR of 117 ± 40 ml/min. mGFR had a stronger linear relationship with inverse cystatin C before (r = 0.28, p = 0.09) and after (r = 0.38, p = 0.02) surgery compared to the inverse of creatinine (before: r = 0.26, p = 0.13; after: r = 0.11, p = 0.51). mGFR fell by 17 ± 35 ml/min (p = 0.007) following surgery. The CKD-EPIcreat-cystC was unquestionably the best overall performing estimating equation before and after surgery, revealing very little bias and a capacity to estimate mGFR within 30% of its true value over 80% of the time. This was true whether or not mGFR was indexed for body surface area. CONCLUSIONS In severely obese bariatric surgery patients with normal kidney function, cystatin C is more strongly associated with mGFR than is serum creatinine. The CKD-EPIcreat-cystC equation best predicted mGFR both before and after surgery.
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Affiliation(s)
- Allon N Friedman
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Ind., USA
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Delanaye P, Mariat C. The applicability of eGFR equations to different populations. Nat Rev Nephrol 2013; 9:513-22. [DOI: 10.1038/nrneph.2013.143] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Pianta TJ, Buckley NA, Peake PW, Endre ZH. Clinical use of biomarkers for toxicant-induced acute kidney injury. Biomark Med 2013; 7:441-56. [DOI: 10.2217/bmm.13.51] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Toxicant-induced acute kidney injury (ToxAKI) causes substantial morbidity and retards drug development. ToxAKI is relatively underexplored compared with ischemia–reperfusion injury in clinical biomarker studies. We highlight the rationale for novel AKI biomarkers in management of ToxAKI, and review the contemporary evidence supporting their clinical use. Directly-acting nephrotoxins, such as cisplatin, aminoglycosides, vancomycin and radiocontrast, remain widely used and highlight how novel biomarkers can either improve the detection of changes in glomerular filtration rate or directly signal cellular injury and structural damage. Serum cystatin C has already improved clinical risk prediction and drug dosing although its clinical use for early diagnosis awaits validation. The use of novel functional and structural biomarkers to stage ToxAKI and aid prognosis requires robust validation and better understanding of the relationship between biomarkers, morbidity and mortality. Biomarkers that illustrate the probable mechanisms and phase of ToxAKI may guide mechanism-specific diagnosis and therapy.
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Affiliation(s)
- Timothy J Pianta
- Department of Nephrology, Prince of Wales Hospital High Street, Randwick, Sydney, NSW 2031, Australia
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Nicholas A Buckley
- Clinical Pharmacology & Toxicology Group, Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Philip W Peake
- Department of Nephrology, Prince of Wales Hospital High Street, Randwick, Sydney, NSW 2031, Australia
| | - Zoltan H Endre
- Department of Medicine, University of Otago, Christchurch, New Zealand
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Serum creatinine as a marker of muscle mass in chronic kidney disease: results of a cross-sectional study and review of literature. J Cachexia Sarcopenia Muscle 2013; 4:19-29. [PMID: 22777757 PMCID: PMC3581614 DOI: 10.1007/s13539-012-0079-1] [Citation(s) in RCA: 239] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Accepted: 06/12/2012] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Higher muscle mass is associated with better outcomes and longevity in patients with chronic disease states. Imaging studies such as dual-energy X-ray absorptiometry (DEXA) are among the gold standard methods for assessing body fat and lean body mass (LBM), approximately half of which is comprised of skeletal muscle mass. Elaborate imaging devices, however, are not commonly available in routine clinical practice and therefore easily accessible and cost-effective, but reliable muscle mass biomarkers are needed. One such marker is serum creatinine, derived from muscle-based creatine, which is inexpensive and ubiquitously available, and it can serve as a biomarker of skeletal muscle mass in human subjects. METHODS AND RESULTS In 118 hemodialysis patients, we found that the 3-month averaged serum creatinine concentration correlated well with DEXA-measured LBM. The recent literature regarding serum creatinine as a surrogate of muscle mass is summarized, as is the literature concerning the use of other measures of muscle mass, such as plasma gelsolin and actin, and urinary creatinine excretion. We have also reviewed the role of dietary meat intake in serum creatinine variability along with several biomarkers of dietary meat intake (creatine, carnitine, carnosine, ophidine, anserine, 3-methyl-L-histidine and 1-methylhistidine). CONCLUSION In summary, none of these biomarkers was studied in CKD patients. We advance the hypothesis that in both health and disease, under steady state, serum creatinine can serve as a reliable muscle mass biomarker if appropriate adjustment for full or residual kidney function and dietary meat intake is undertaken.
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Bailey PK, Tomson CRV, Kinra S, Ebrahim S, Radhakrishna KV, Kuper H, Nitsch D, Ben-Shlomo Y. Differences in estimation of creatinine generation between renal function estimating equations in an Indian population: cross-sectional data from the Hyderabad arm of the Indian migration study. BMC Nephrol 2013; 14:30. [PMID: 23379609 PMCID: PMC3599554 DOI: 10.1186/1471-2369-14-30] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 01/31/2013] [Indexed: 01/19/2023] Open
Abstract
Background Creatinine based formulae for estimating renal function developed in white populations may be less valid in other ethnic groups. We assessed the performance of various estimating formulae in an Indian population. Methods 917 subjects were recruited from the Hyderabad arm of the Indian Migration Study. Data were collected on comorbidity, serum creatinine and body composition from DXA scans. Renal function was compared using the modified Cockcroft-Gault, MDRD and CKD-EPI formulae. 24-hour creatinine production was derived from each estimate and the agreement with measured muscle mass examined. 24-hour creatinine production estimates were compared to that derived from a formula by Rule incorporating DXA measured muscle mass. Potential systematic biases were examined by age and eGFR. We assessed the association of renal function by each formula with hypertension and self-reported measures of vascular disease. Results Mean modified Cockcroft-Gault eCCl was 98.8 ml/min/1.73 m2, MDRD eGFR 91.2 ml/min/1.73 m2 and CKD-EPI eGFR 96.3 ml/min/1.73 m2. MDRD derived 24-hour creatinine production showed the least age-related underestimation compared to the Rule formula. CKD-EPI showed a marked bias at higher eGFRs. All formulae showed similar strength associations with vascular disease and hypertension. Conclusions Our analyses support the use of MDRD for estimating renal function in Indian populations. Further work is required to assess the predictive value of formulae for incident disease and complications of CKD.
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Affiliation(s)
- Phillippa K Bailey
- The Richard Bright Renal Unit, Southmead Hospital, Westbury-on-Trym, Bristol BS10 5NB, UK.
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