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Zhao S, Ding Y, Gan L, Yang P, Xie Y, Hu Y, Chen J, Wang X, Huang Z, Zhou B. Evaluation of split renal dysfunction using radiomics based on magnetic resonance diffusion-weighted imaging. Med Phys 2024; 51:5226-5235. [PMID: 38801337 DOI: 10.1002/mp.17131] [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: 09/11/2023] [Revised: 04/28/2024] [Accepted: 04/30/2024] [Indexed: 05/29/2024] Open
Abstract
BACKGROUND Accurate and noninvasive assessment of split renal dysfunction is crucial, while there is lack of corresponding method clinically. PURPOSE To investigate the feasibility of using diffusion-weighted imaging (DWI)-based radiomics models to evaluate split renal dysfunction. METHODS We enrolled patients with impaired and normal renal function undergoing renal DWI examination. Glomerular filtration rate (GFR, mL/min) was measured using 99mTc-DTPA scintigraphy, which is reference standard of GFR measurement. The kidneys were classified into normal (GFR ≥40), mildly impaired (20≤ GFR < 40), moderately impaired (10≤ GFR < 20), and severely impaired (GFR < 10) renal function groups. Optimized subsets of radiomics features were selected from renal DWI images and radiomics scores (Rad-score) calculated to discriminate groups with different renal function. The radiomics model (Rad-score based) was developed in a training cohort and validated in a test cohort. Evaluations were conducted on the discrimination, calibration, and clinical application of the method. RESULTS The final analysis included 330 kidneys. Logistic regression was used to develop three radiomics models, model A, B, and C, which were used to distinguish normal from impaired, mild from moderate, and moderate from severe renal function, respectively. The area under the curve of the three models were 0.822, 0.704, and 0.887 in the training cohort and 0.843, 0.717, and 0.897 in the test cohort, respectively, indicating efficient discrimination performance. CONCLUSIONS DWI-based radiomics models have potential for evaluating split renal dysfunction and discriminating between normal and impaired renal function groups and their subgroups.
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Affiliation(s)
- Shengchao Zhao
- Center of Interventional Medicine, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong Province, China
- Center of Cerebrovascular Disease, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong Province, China
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong Province, China
| | - Yi Ding
- Department of Radiology, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lijuan Gan
- Department of Gynecological Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Pei Yang
- Department of Radiology, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yuanliang Xie
- Department of Radiology, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yun Hu
- Department of Radiology, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | | | - Xiang Wang
- Department of Radiology, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zengfa Huang
- Department of Radiology, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bin Zhou
- Center of Interventional Medicine, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong Province, China
- Center of Cerebrovascular Disease, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong Province, China
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong Province, China
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Hall RK, Kazancıoğlu R, Thanachayanont T, Wong G, Sabanayagam D, Battistella M, Ahmed SB, Inker LA, Barreto EF, Fu EL, Clase CM, Carrero JJ. Drug stewardship in chronic kidney disease to achieve effective and safe medication use. Nat Rev Nephrol 2024; 20:386-401. [PMID: 38491222 DOI: 10.1038/s41581-024-00823-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/22/2024] [Indexed: 03/18/2024]
Abstract
People living with chronic kidney disease (CKD) often experience multimorbidity and require polypharmacy. Kidney dysfunction can also alter the pharmacokinetics and pharmacodynamics of medications, which can modify their risks and benefits; the extent of these changes is not well understood for all situations or medications. The principle of drug stewardship is aimed at maximizing medication safety and effectiveness in a population of patients through a variety of processes including medication reconciliation, medication selection, dose adjustment, monitoring for effectiveness and safety, and discontinuation (deprescribing) when no longer necessary. This Review is aimed at serving as a resource for achieving optimal drug stewardship for patients with CKD. We describe special considerations for medication use during pregnancy and lactation, during acute illness and in patients with cancer, as well as guidance for the responsible use of over-the-counter drugs, herbal remedies, supplements and sick-day rules. We also highlight inequities in medication access worldwide and suggest policies to improve access to quality and essential medications for all persons with CKD. Further strategies to promote drug stewardship include patient education and engagement, the use of digital health tools, shared decision-making and collaboration within interdisciplinary teams. Throughout, we position the person with CKD at the centre of all drug stewardship efforts.
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Affiliation(s)
- Rasheeda K Hall
- Division of Nephrology, Department of Medicine, and Department of Population Health Sciences, Duke University School of Medicine, Durham, NC, USA
| | | | | | - Germaine Wong
- Sydney School of Public Health, University of Sydney, Sydney, Australia
| | | | | | - Sofia B Ahmed
- Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Lesley A Inker
- Division of Nephrology, Department of Internal Medicine, Tufts Medical Center, Boston, MA, USA
| | | | - Edouard L Fu
- Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, USA
| | - Catherine M Clase
- Department of Medicine and Health Research Methods, Evidence and Impact, McMaster University, Ontario, Canada
| | - Juan J Carrero
- Medical Epidemiology and Biostatistics, Karolinska Institutet, and Division of Nephrology, Department of Clinical Sciences, Danderyd Hospital, Stockholm, Sweden.
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Stevens PE, Ahmed SB, Carrero JJ, Foster B, Francis A, Hall RK, Herrington WG, Hill G, Inker LA, Kazancıoğlu R, Lamb E, Lin P, Madero M, McIntyre N, Morrow K, Roberts G, Sabanayagam D, Schaeffner E, Shlipak M, Shroff R, Tangri N, Thanachayanont T, Ulasi I, Wong G, Yang CW, Zhang L, Levin A. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int 2024; 105:S117-S314. [PMID: 38490803 DOI: 10.1016/j.kint.2023.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 10/31/2023] [Indexed: 03/17/2024]
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4
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Adingwupu OM, Barbosa ER, Palevsky PM, Vassalotti JA, Levey AS, Inker LA. Cystatin C as a GFR Estimation Marker in Acute and Chronic Illness: A Systematic Review. Kidney Med 2023; 5:100727. [PMID: 37928862 PMCID: PMC10623366 DOI: 10.1016/j.xkme.2023.100727] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023] Open
Abstract
Rationale & Objective Creatinine-based GFR estimating (eGFRcr) equations may be inaccurate in populations with acute or chronic illness. The accuracy of GFR equations that use cystatin C (eGFRcys) or creatinine-cystatin C (eGFRcr-cys) is not well studied in these populations. Study Design A systematic review of original articles identified from PubMed and expert sources. Two reviewers screened articles independently and identified those meeting inclusion criteria. Setting & Study Populations Adults and children with acute or chronic illness. Selection Criteria for Studies Studies published since 2011 that compared performance of eGFRcr, eGFRcys, and eGFRcr-cys relative to measured GFR (mGFR), used standardized assays for creatinine or cystatin C, and used eGFR equations developed using such assays. Studies of ambulatory clinical populations or research studies in populations with only CKD, kidney transplant recipients, only diabetes, kidney donor candidates, and community-based cohorts were excluded. Data Extraction Data extracted from full text. Analytical Approach Bias and percentages of estimates within 30% of mGFR (P30) of eGFR compared with mGFR were evaluated. Results Of the 179 citations, 26 studies met the inclusion criteria: 24 in adults and 2 in children in clinical populations with cancer (n=5), HIV (n=5), cirrhosis (n=3), liver transplant (n=3), heart failure (n=2), neuromuscular diseases (n=1) critical illness (n=5), and obesity (n=2). In general, eGFRcr-cys had greater accuracy than eGFRcr or eGFRcys equations among study populations with cancer, HIV, and obesity, but did not perform consistently better in cirrhosis, liver transplant, heart failure, neuromuscular disease, and critical illness. Limitations Participants were selected because of concern for inaccurate eGFRcr, which may bias results. Most studies had small sample sizes, limiting generalizability. Conclusions eGFRcr-cys improves GFR estimation in populations with a variety of acute and chronic illnesses, providing indications for cystatin C measurement. Performance was poor in many studies, suggesting the need for more frequent mGFR. Plain-Language Summary Kidney function, specifically glomerular filtration rate (GFR), estimated using creatinine (eGFRcr) is often inaccurate in people with acute and chronic illness. The accuracy of estimates using cystatin C alone (eGFRcys) or together with creatinine (eGFRcr-cys) is not well studied in these populations. We conducted a systematic review to address the knowledge gap. Of the 179 papers reviewed, we identified 26 studies in clinical populations with cancer (n=5); HIV (n=5); cirrhosis (n=3); liver transplant (n=3); heart failure (n=2); neuromuscular disease (n=1); critical illness (n=5); and obesity (n=2). In general, eGFRcr-cys improved the GFR estimation in HIV, cancer, and obesity, providing indications for cystatin C measurement. Performance was poor in many studies, suggesting the need for more frequent measured GFR.
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Affiliation(s)
- Ogechi M. Adingwupu
- Department of Medicine, Division of Nephrology, Tufts Medical Center, Boston, MA
| | | | - Paul M. Palevsky
- Renal Section, Medical Service, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA
| | - Joseph A. Vassalotti
- Icahn School of Medicine at Mount Sinai, New York, NY; National Kidney Foundation, Inc, New York, NY
| | - Andrew S. Levey
- Department of Medicine, Division of Nephrology, Tufts Medical Center, Boston, MA
| | - Lesley A. Inker
- Department of Medicine, Division of Nephrology, Tufts Medical Center, Boston, MA
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Wang Y, Adingwupu OM, Shlipak MG, Doria A, Estrella MM, Froissart M, Gudnason V, Grubb A, Kalil R, Mauer M, Rossing P, Seegmiller J, Coresh J, Levey AS, Inker LA. Discordance Between Creatinine-Based and Cystatin C-Based Estimated GFR: Interpretation According to Performance Compared to Measured GFR. Kidney Med 2023; 5:100710. [PMID: 37753251 PMCID: PMC10518599 DOI: 10.1016/j.xkme.2023.100710] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2023] Open
Abstract
Rationale & Objective Use of cystatin C in addition to creatinine to estimate glomerular filtration rate (estimated glomerular filtration rate based on cystatin C [eGFRcys] and estimated glomerular filtration rate based on creatinine [eGFRcr], respectively) is increasing. When eGFRcr and eGFRcys are discordant, it is not known which is more accurate, leading to uncertainty in clinical decision making. Study Design Cross-sectional analysis. Setting & Participants Four thousand fifty participants with measured glomerular filtration rate (mGFR) from 12 studies in North America and Europe. Exposures Serum creatinine and serum cystatin C. Outcomes Performance of creatinine-based and cystatin C-based glomerular filtration rate estimating equations compared to mGFR. Analytical Approach We evaluated the accuracy of eGFRcr, eGFRcys, and the combination (eGFRcr-cys) compared to mGFR according to the magnitude of the difference between eGFRcr and eGFRcys (eGFRdiff). We used CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equations to estimate glomerular filtration rate. eGFRdiff was defined as eGFRcys minus eGFRcr and categorized as less than -15, -15 to <15, and ≥15 mL/min/1.73 m2 (negative, concordant, and positive groups, respectively). We compared bias (median of mGFR minus eGFR) and the percentage of eGFR within 30% of mGFR. Results Thirty percent of participants had discordant eGFRdiff (21.0% and 9.6% negative and positive eGFRdiffs, respectively). In the concordant eGFRdiff group, all equations displayed similar accuracy. In the negative eGFRdiff groups, eGFRcr had a large overestimation of mGFR (-13.4 [-14.5 to -12.2] mL/min/1.73 m2) and eGFRcys had a large underestimation (9.9 [9.1-11.2] mL/min/1.73m2), with opposite results in the positive eGFRdiff group. In both negative and positive eGFRdiff groups, eGFRcr-cys was more accurate than either eGFRcr or eGFRcys. These results were largely consistent across age, sex, race, and body mass index. Limitations Few participants with major comorbid conditions. Conclusions Discordant eGFRcr and eGFRcys are common. eGFR using the combination of creatinine and cystatin C provides the most accurate estimates among persons with discordant eGFRcr or eGFRcys.
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Affiliation(s)
- Yeli Wang
- Department of Nutrition, Harvard University T.H. Chan School of Public Health, Boston, MA
| | | | - Michael G. Shlipak
- Kidney Health Research Collaborative, San Francisco Veterans Affair Medical Center and University of California, San Francisco, CA
| | - Alessandro Doria
- Section on Genetics & Epidemiology, Joslin Diabetes Center, and the Department of Medicine, Harvard Medical School, Boston, MA
| | - Michelle M. Estrella
- Division of Nephrology, Department of Medicine, San Francisco VA Health Care System and University of California, San Francisco, CA
| | - Marc Froissart
- Clinical Trial Unit, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
| | - Vilmundur Gudnason
- Faculty of Medicine, University of Iceland, Reykjavik, and the Icelandic Heart Association, Kopavogur, Iceland
| | - Anders Grubb
- Department of Clinical Chemistry and Pharmacology, Institute of Laboratory Medicine, Lund University, Sweden
| | - Roberto Kalil
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore MD
| | - Michael Mauer
- Divisions of Pediatric and Adult Nephrology, University of Minnesota, Minneapolis, MN
| | - Peter Rossing
- Steno Diabetes Center Copenhagen and the Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Jesse Seegmiller
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN
| | - Josef Coresh
- Department of Epidemiology, John Hopkins Bloomberg School of Public Health, Baltimore, MD
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Bystad EW, Stefansson VT, Eriksen BO, Melsom T. The Association Between Metabolic Syndrome, Hyperfiltration, and Long-Term GFR Decline in the General Population. Kidney Int Rep 2023; 8:1831-1840. [PMID: 37705899 PMCID: PMC10496074 DOI: 10.1016/j.ekir.2023.06.022] [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: 01/08/2023] [Revised: 06/20/2023] [Accepted: 06/26/2023] [Indexed: 09/15/2023] Open
Abstract
Introduction One-quarter of adults worldwide meet the criteria of metabolic syndrome (MetS). MetS increases the risk of diabetes, chronic kidney disease (CKD), and cardiovascular disease. However, the association between MetS, hyperfiltration, and long-term glomerular filtration rate (GFR) decline in the general population is unknown. Methods In the Renal Iohexol Clearance Survey (RENIS), we investigated 1551 people aged 50 to 63 years; representative of the general population without diabetes, cardiovascular disease, or kidney disease. The GFR was measured using iohexol clearance at baseline and twice during 11 years of follow-up. Hyperfiltration at baseline was defined as an absolute GFR (ml/min) above the 90th percentile adjusted for sex, age, and height, because these variables correlate with nephron number. MetS was defined as increased waist circumference and 2 risk factors among hypertension, hyperglycemia, elevated triglycerides, and low high density lipoprotein (HDL)-cholesterol levels. The GFR decline rate was calculated using linear mixed models. Results MetS was associated with hyperfiltration at baseline (odds ratio [OR] 2.4; 95% CI: 1.7-3.5, P < 0.001) and a steeper GFR decline rate during follow-up (-0.30 [-0.43 to -0.16] ml/min per 1.73 m2/yr). Compared to those without MetS, GFR decline was -0.83 (95% CI: -1.13 to -0.53) ml/min per 1.73 m2/yr in those with MetS and baseline hyperfiltration and -0.15 (-0.30 to 0.00) in those MetS without hyperfiltration, P = 0.2 for interaction. Conclusions In the nondiabetic general population, those with MetS had an increased OR of hyperfiltration and steeper long-term GFR decline. Randomized controlled trials are needed to explore whether treatment of hyperfiltration can prevent loss of GFR in persons with MetS.
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Affiliation(s)
- Erikka W. Bystad
- Metabolic and Renal Research Group, UiT-The Arctic University of Norway, Tromsø, Norway
| | - Vidar T.N. Stefansson
- Metabolic and Renal Research Group, UiT-The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Bjørn O. Eriksen
- Metabolic and Renal Research Group, UiT-The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT-The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
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Enoksen ITT, Rinde NB, Svistounov D, Norvik JV, Solbu MD, Eriksen BO, Melsom T. Validation of eGFR for Detecting Associations Between Serum Protein Biomarkers and Subsequent GFR Decline. J Am Soc Nephrol 2023; 34:1409-1420. [PMID: 37093083 PMCID: PMC10400103 DOI: 10.1681/asn.0000000000000147] [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: 09/16/2022] [Accepted: 04/01/2023] [Indexed: 04/25/2023] Open
Abstract
SIGNIFICANCE STATEMENT eGFR from creatinine, cystatin C, or both has been primarily used in search of biomarkers for GFR decline. Whether the relationships between biomarkers and eGFR decline are similar to associations with measured GFR (mGFR) decline has not been investigated. This study revealed that some biomarkers showed statistically significant different associations with eGFR decline compared with mGFR decline, particularly for eGFR from cystatin C. The findings indicate that non-GFR-related factors, such as age, sex, and body mass index, influence the relationship between biomarkers and eGFR decline. Therefore, the results of biomarker studies using eGFR, particularly eGFRcys, should be interpreted with caution and perhaps validated with mGFR. BACKGROUND Several serum protein biomarkers have been proposed as risk factors for GFR decline using eGFR from creatinine or cystatin C. We investigated whether eGFR can be used as a surrogate end point for measured GFR (mGFR) when searching for biomarkers associated with GFR decline. METHODS In the Renal Iohexol Clearance Survey, GFR was measured with plasma iohexol clearance in 1627 individuals without diabetes, kidney, or cardiovascular disease at baseline. After 11 years of follow-up, 1409 participants had one or more follow-up GFR measurements. Using logistic regression and interval-censored Cox regression, we analyzed the association between baseline levels of 12 serum protein biomarkers with the risk of accelerated GFR decline and incident CKD for both mGFR and eGFR. RESULTS Several biomarkers exhibited different associations with eGFR decline compared with their association with mGFR decline. More biomarkers showed different associations with eGFRcys decline than with eGFRcre decline. Most of the different associations of eGFR decline versus mGFR decline remained statistically significant after adjustment for age, sex, and body mass index, but several were attenuated and not significant after adjusting for the corresponding baseline mGFR or eGFR. CONCLUSIONS In studies of some serum protein biomarkers, eGFR decline may not be an appropriate surrogate outcome for mGFR decline. Although the differences from mGFR decline are attenuated by adjustment for confounding factors in most cases, some persist. Therefore, proposed biomarkers from studies using eGFR should preferably be validated with mGFR.
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Affiliation(s)
- Inger T. T. Enoksen
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
| | - Nikoline B. Rinde
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
| | - Dmitri Svistounov
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
| | - Jon V. Norvik
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Marit D. Solbu
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Bjørn O. Eriksen
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
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Muiesan ML, Agabiti Rosei C, Paini A, Casiglia E, Cirillo M, Grassi G, Iaccarino G, Mallamaci F, Maloberti A, Mazza A, Mengozzi A, Palatini P, Parati G, Reboldi G, Rivasi G, Russo E, Salvetti M, Tikhonoff V, Tocci G, Borghi C. Serum uric acid and left ventricular mass index independently predict cardiovascular mortality: The uric acid right for heart health (URRAH) project. Eur J Intern Med 2023; 114:58-65. [PMID: 37098447 DOI: 10.1016/j.ejim.2023.04.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 04/03/2023] [Accepted: 04/11/2023] [Indexed: 04/27/2023]
Abstract
A relationship between serum uric acid (SUA) and cardiovascular (CV) events has been documented in the Uric Acid Right for Heart Health (URRAH) study. AIM of this study was to investigate the association between SUA and left ventricular mass index (LVMI) and whether SUA and LVMI or their combination may predict the incidence of CV death. METHODS Subjects with echocardiographic measurement of LVMI included in the URRAH study (n=10733) were part of this analysis. LV hypertrophy (LVH) was defined as LVMI > 95 g/m2 in women and 115 g/m2 in men. RESULTS A significant association between SUA and LVMI was observed in multiple regression analysis in men: beta 0,095, F 5.47, P< 0.001 and women: beta 0,069, F 4.36, P<0.001. During follow-up 319 CV deaths occurred. Kaplan-Meier curves showed a significantly poorer survival rate in subjects with higher SUA (> 5.6 mg/dl in men and 5.1 mg/dl in women) and LVH (log-rank chi-square 298.105; P<0.0001). At multivariate Cox regression analysis in women LVH alone and the combination of higher SUA and LVH but not hyperuricemia alone, were associated with a higher risk of CV death, while in men hyperuricemia without LVH, LVH without hyperuricemia and their combination were all associated with a higher incidence of CV death. CONCLUSIONS Our findings demonstrate that SUA is independently associated with LVMI and suggest that the combination of hyperuricemia with LVH is an independent and powerful predictor for CV death both in men and women.
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Affiliation(s)
- Maria Lorenza Muiesan
- Department of Clinical and Experimental Sciences, University of Brescia, c/o 2 Medicina - ASST Spedali Civili Brescia, Piazzale Spedali Civili 1 Brescia, Italy.
| | - Claudia Agabiti Rosei
- Department of Clinical and Experimental Sciences, University of Brescia, c/o 2 Medicina - ASST Spedali Civili Brescia, Piazzale Spedali Civili 1 Brescia, Italy
| | - Anna Paini
- Department of Clinical and Experimental Sciences, University of Brescia, c/o 2 Medicina - ASST Spedali Civili Brescia, Piazzale Spedali Civili 1 Brescia, Italy
| | - Edoardo Casiglia
- Studium Patavinum, Department of Medicine, University of Padua, Padua, Italy
| | - Massimo Cirillo
- Department of Public Health, "Federico II" University of Naples, Naples, Italy
| | - Guido Grassi
- Clinica Medica, Department of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy
| | - Guido Iaccarino
- Department of Advanced Biomedical Sciences, ''Federico II'' University of Naples, Naples, Italy
| | - Francesca Mallamaci
- CNR-IFC, Clinical Epidemiology of Renal Diseases and Hypertension, Reggio Cal Unit, Reggio Calabria, Italy
| | - Alessandro Maloberti
- Cardiology IV, ''A.De Gasperi's'' Department, Niguarda Ca' Granda Hospital, Milan, Italy; School of Medicine and Surgery, Milano-Bicocca University, Milan, Italy
| | - Alberto Mazza
- Department of Internal Medicine, Santa Maria Della Misericordia General Hospital, AULSS 5 Polesana, 11Rovigo, Italy
| | - Alessandro Mengozzi
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa 56126, Italy; Center for Translational and Experimental Cardiology (CTEC), Department of Cardiology, University Hospital Zurich, University of Zurich, Schlieren, Switzerland; Scuola Superiore Sant'Anna, Pisa, Italy
| | - Paolo Palatini
- Studium Patavinum, Department of Medicine, University of Padua, Padua, Italy
| | - Gianfranco Parati
- IRCCS, Istituto Auxologico Italiano, Ospedale San Luca, Milan, Italy; Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Gianpaolo Reboldi
- Department of Medical and Surgical Science, University of Perugia, Perugia, Italy
| | - Giulia Rivasi
- Department of Geriatric and Intensive Care Medicine, Careggi Hospital and University of Florence, Italy
| | - Elisa Russo
- Department of Internal Medicine, University of Genoa IRCSS Ospedale Policlinico San Martino, Genova, Italy
| | - Massimo Salvetti
- Department of Clinical and Experimental Sciences, University of Brescia, c/o 2 Medicina - ASST Spedali Civili Brescia, Piazzale Spedali Civili 1 Brescia, Italy
| | | | - Giuliano Tocci
- Department of Clinical and Molecular Medicine, University of Rome Sapienza, Rome, Italy
| | - Claudio Borghi
- Department Hypertension and Cardiovascular Disease Research Center, Medical and Surgical Sciences Dept., Alma Mater Studiorum University of Bologna, Bologna, Italy; Heart-Chest-Vascular Dept., IRCCS AOU of Bologna, Bologna, Italy
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Keddis MT, Howard MR, Galapia L, Barreto EF, Zhang N, Butterfield RJ, Rule AD. GFR estimated with creatinine rather than cystatin C is more reflective of the true risk of adverse outcomes with low GFR in kidney transplant recipients. Nephrol Dial Transplant 2023; 38:1898-1906. [PMID: 36646435 PMCID: PMC10387404 DOI: 10.1093/ndt/gfad007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Serum cystatin C-based estimated glomerular filtration rate (eGFRcys) generally associates with clinical outcomes better than serum creatinine-based eGFR (eGFRcr) despite similar precision in estimating measured GFR (mGFR). We sought to determine whether the risk of adverse outcomes with eGFRcr or eGFRcys was via GFR alone or also via non-GFR determinants among kidney transplant recipients. METHODS Consecutive adult kidney transplant recipients underwent a standardized GFR assessment during a routine follow-up clinic visit between 2011 and 2013. Patients were followed for graft failure or the composite outcome of cardiovascular (CV) events or mortality through 2020. The risk of these events by baseline mGFR, eGFRcr and eGFRcys was assessed unadjusted, adjusted for mGFR and adjusted for CV risk factors. RESULTS There were 1135 recipients with a mean baseline mGFR of 55.6, eGFRcr of 54.8 and eGFRcys of 46.8 ml/min/1.73 m2 and a median follow-up of 6 years. Each 10 ml/min/1.73 m2 decrease in mGFR, eGFRcr or eGFRcys associated with graft failure [hazard ratio (HR) 1.79, 1.68 and 2.07, respectively; P < .001 for all) and CV events or mortality outcome (HR 1.28, 1.19 and 1.43, respectively; P < .001 for all). After adjusting for mGFR, eGFRcys associated with graft failure (HR 1.57, P < .001) and CV events or mortality (HR 1.49, P < .001), but eGFRcr did not associate with either. After further adjusting for CV risk factors, risk of these outcomes with lower eGFRcys was attenuated. CONCLUSION eGFRcr better represents the true relationship between GFR and outcomes after kidney transplantation because it has less non-GFR residual association. Cystatin C is better interpreted as a nonspecific prognostic biomarker than is eGFR in the kidney transplant setting.
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Affiliation(s)
- Mira T Keddis
- Division of Nephrology, Mayo Clinic, Scottsdale, AZ, USA
| | | | - Leyton Galapia
- Division of Nephrology, Mayo Clinic, Scottsdale, AZ, USA
| | | | - Nan Zhang
- Department of Quantitative Health Sciences, Mayo Clinic, Scottsdale, AZ, USA
| | | | - Andrew D Rule
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA
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10
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Nitric-oxide precursors and dimethylarginines as risk markers for accelerated measured GFR decline in the general population. Kidney Int Rep 2023; 8:818-826. [PMID: 37069987 PMCID: PMC10105054 DOI: 10.1016/j.ekir.2023.01.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 12/02/2022] [Accepted: 01/09/2023] [Indexed: 01/20/2023] Open
Abstract
Introduction Nitric oxide (NO) deficiency is associated with endothelial dysfunction, hypertension, atherosclerosis, and chronic kidney disease (CKD). Reduced NO bioavailability is hypothesized to play a vital role in kidney function impairment and CKD. We investigated the association of serum levels of endogenous inhibitors of NO, asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA), and precursors of NO, arginine, citrulline, and ornithine, with a decline in glomerular filtration rate (GFR) and new-onset CKD. Methods In a prospective cohort study of 1407 healthy, middle-aged participants of Northern European origin in the Renal Iohexol Clearance Survey (RENIS), GFR was measured repeatedly with iohexol clearance during a median follow-up time of 11 years. GFR decline rates were analyzed using a linear mixed model, new-onset CKD (GFR < 60 ml/min per 1.73 m2) was analyzed with interval-censored Cox regression, and accelerated GFR decline (the 10% with the steepest GFR decline) was analyzed with logistic regression. Results Higher SDMA was associated with slower annual GFR decline. Higher levels of citrulline and ornithine were associated with accelerated GFR decline (odds ratio [OR], 1.43; 95% confidence interval [CI] 1.16-1.76 per SD higher citrulline and OR 1.23; 95% CI 1.01 to 1.49 per SD higher ornithine). Higher citrulline was associated with new-onset CKD, with a hazard ratio of 1.33 (95% CI 1.07-1.66) per SD higher citrulline. Conclusions Associations between NO precursors and the outcomes suggest that NO metabolism plays a significant role in the pathogenesis of age-related GFR decline and the development of CKD in middle-aged people.
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11
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Park S, Lee S, Kim Y, Cho S, Huh H, Kim K, Kim YC, Han SS, Lee H, Lee JP, Joo KW, Lim CS, Kim YS, Kim DK. Nonlinear causal effects of estimated glomerular filtration rate on myocardial infarction risks: Mendelian randomization study. BMC Med 2022; 20:44. [PMID: 35109828 PMCID: PMC8811984 DOI: 10.1186/s12916-022-02251-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/11/2022] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Previous observational studies suggested that a reduction in estimated glomerular filtration rate (eGFR) or a supranormal eGFR value was associated with adverse cardiovascular risks. However, a previous Mendelian randomization (MR) study under the linearity assumption reported null causal effects from eGFR on myocardial infarction (MI) risks. Further investigation of the nonlinear causal effect of kidney function assessed by eGFR on the risk of MI by nonlinear MR analysis is warranted. METHODS In this MR study, genetic instruments for log-eGFR based on serum creatinine were developed from European samples included in the CKDGen genome-wide association study (GWAS) meta-analysis (N=567,460). Alternate instruments for log-eGFR based on cystatin C were developed from a GWAS of European individuals that included the CKDGen and UK Biobank data (N=460,826). Nonlinear MR analysis for the risk of MI was performed using the fractional polynomial method and the piecewise linear method on data from individuals of white British ancestry in the UK Biobank (N=321,024, with 12,205 MI cases). RESULTS Nonlinear MR analysis demonstrated a U-shaped (quadratic P value < 0.001) association between MI risk and genetically predicted eGFR (creatinine) values, as MI risk increased as eGFR declined in the low eGFR range and the risk increased as eGFR increased in the high eGFR range. The results were similar even after adjustment for clinical covariates, such as blood pressure, diabetes mellitus, dyslipidemia, or urine microalbumin levels, or when genetically predicted eGFR (cystatin C) was included as the exposure. CONCLUSION Genetically predicted eGFR is significantly associated with the risk of MI with a parabolic shape, suggesting that kidney function impairment, either by reduced or supranormal eGFR, may be causally linked to a higher MI risk.
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Affiliation(s)
- Sehoon Park
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, South Korea.,Department of Internal Medicine, Armed Forces Capital Hospital, Gyeonggi-do, South Korea
| | - Soojin Lee
- Department of Internal Medicine, Uijeongbu Eulji University Medical Center, Seoul, South Korea.,Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - Yaerim Kim
- Department of Internal Medicine, Keimyung University School of Medicine, Daegu, South Korea
| | - Semin Cho
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea.,Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
| | - Hyeok Huh
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
| | - Kwangsoo Kim
- Transdisciplinary Department of Medicine & Advanced Technology, Seoul National University Hospital, Seoul, South Korea
| | - Yong Chul Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
| | - Seung Seok Han
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea.,Kidney Research Institute, Seoul National University, Seoul, South Korea
| | - Hajeong Lee
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
| | - Jung Pyo Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea.,Kidney Research Institute, Seoul National University, Seoul, South Korea.,Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, South Korea
| | - Kwon Wook Joo
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea.,Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea.,Kidney Research Institute, Seoul National University, Seoul, South Korea
| | - Chun Soo Lim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea.,Kidney Research Institute, Seoul National University, Seoul, South Korea.,Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, South Korea
| | - Yon Su Kim
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, South Korea.,Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea.,Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea.,Kidney Research Institute, Seoul National University, Seoul, South Korea
| | - Dong Ki Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea. .,Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea. .,Kidney Research Institute, Seoul National University, Seoul, South Korea.
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12
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Wu XR, Wu KM, Deng YT, Huang SY, Yang L, Dong Q, Feng JF, Cheng W, Yu JT. Association of Kidney Function with Risk of Incident Dementia: A Prospective Cohort Study of 275,167 UK Biobank Participants. J Alzheimers Dis 2022; 90:1249-1261. [PMID: 36245378 DOI: 10.3233/jad-220609] [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] [Indexed: 11/06/2022]
Abstract
BACKGROUND Previous studies have reported inconsistent associations between chronic kidney disease (CKD) and dementia. OBJECTIVE To evaluate whether CKD is a risk factor for dementia and compare the performance of different measures of calculating estimated glomerular filtration rate (eGFR). METHODS 275,167 participants from UK Biobank were included and eGFR at baseline was calculated using serum creatinine (eGFRcr), cystatin C (eGFRcys), and creatinine-cystatin C equations (eGFRcr-cys). Restricted cubic splines and Cox regression models were performed to assess the relationship of eGFR with all-cause dementia, Alzheimer's disease (AD), and vascular dementia (VaD). RESULTS We observed a U-shaped relationship between each eGFR and risk of all-cause dementia and VaD, with eGFRcys and eGFRcr-cys showing a closer linkage (peGFRcys <0.0001, peGFRcrhboxcys<0.0001 and peGFRcr = 0.0001). Lower and supranormal eGFR were related to increased risk of all-cause dementia. Compared to the reference category of 90-104 ml/min/1.73 m2, adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) of all-cause dementia for eGFRcr-cys 30-59, <30, and ≥105 ml/min/1.73 m2 were 1.26 (95% CI [1.05-1.50], p = 0.012), 2.62 (95% CI [1.54-4.47], p < 0.001), and 1.41 (95% CI [1.17-1.70], p < 0.001). No statistically significant association was observed between eGFR with risk of AD. CONCLUSION This prospective study identified impaired kidney function as a critical risk factor for dementia and noted the application of cystatin C strengthened the relationship between CKD and dementia, underlining the significant value of preserving kidney function to reduce the risk of dementia and considering cystatin C measurement as part of clinical practice.
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Affiliation(s)
- Xin-Rui Wu
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science, Fudan University, Shanghai, China
| | - Kai-Min Wu
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science, Fudan University, Shanghai, China
| | - Yue-Ting Deng
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science, Fudan University, Shanghai, China
| | - Shu-Yi Huang
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science, Fudan University, Shanghai, China
| | - Liu Yang
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science, Fudan University, Shanghai, China
| | - Qiang Dong
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science, Fudan University, Shanghai, China
| | - Jian-Feng Feng
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China
- Department of Computer Science, University of Warwick, Coventry, UK
| | - Wei Cheng
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China
- Department of Computer Science, University of Warwick, Coventry, UK
| | - Jin-Tai Yu
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science, Fudan University, Shanghai, China
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13
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Mickelsson M, Söderström E, Stefansson K, Andersson J, Söderberg S, Hultdin J. Smoking tobacco is associated with renal hyperfiltration. Scand J Clin Lab Invest 2021; 81:622-628. [PMID: 34669529 DOI: 10.1080/00365513.2021.1989713] [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: 06/14/2021] [Revised: 09/13/2021] [Accepted: 10/03/2021] [Indexed: 10/20/2022]
Abstract
Tobacco consumption is a renal risk factor, but the effects on the estimated glomerular filtration rate (eGFR) remain unclear. We aimed to evaluate the possible impact of using tobacco products (smoking and snus) on eGFR based on creatinine or cystatin C. We used a first cohort with 949 participants and a second cohort with 995 participants; none had pre-existing renal disease. All subjects donated a blood sample and completed a questionnaire, including questions about tobacco use. To assess the effect on eGFR, hierarchical multiple linear regression models were used. Active smoking associated independently with a higher eGFRcreatinine in all subjects (p < 0.001; β = 0.11). Further analyses stratified for sex, showed similar findings for men (p < 0.001; β = 0.14) and for women (p = 0.026; β = 0.10). eGFRcystatin C was significantly associated with active smoking in all subjects (p = 0.040; β = -0.05), but no association was seen after stratification for sex. Snus did not associate with eGFR. In conclusion, smoking associated significantly with a higher eGFRcreatinine. The mechanism may be renal hyperfiltration of smaller molecules such as creatinine. This is probably caused by substances from smoked tobacco other than nicotine, as no effect was seen for snus.
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Affiliation(s)
- Malin Mickelsson
- Department of Medical Biosciences, Clinical Chemistry, Umeå University, Umeå, Sweden
| | - Elisabet Söderström
- Department of Medical Biosciences, Clinical Chemistry, Norrbotten County Council, Sunderby Hospital, Umeå University, Umeå, Sweden
| | - Kristina Stefansson
- Department of Medical Biosciences, Clinical Chemistry, Umeå University, Umeå, Sweden
| | - Jonas Andersson
- Department of Public Health and Clinical Medicine, Skellefteå Research Unit, Umeå University, Umeå, Sweden
| | - Stefan Söderberg
- Department of Public Health and Clinical Medicine, Medicine, Umeå University, Umeå, Sweden
| | - Johan Hultdin
- Department of Medical Biosciences, Clinical Chemistry, Umeå University, Umeå, Sweden
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14
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Ebert N, Bevc S, Bökenkamp A, Gaillard F, Hornum M, Jager KJ, Mariat C, Eriksen BO, Palsson R, Rule AD, van Londen M, White C, Schaeffner E. Assessment of kidney function: clinical indications for measured GFR. Clin Kidney J 2021; 14:1861-1870. [PMID: 34345408 PMCID: PMC8323140 DOI: 10.1093/ckj/sfab042] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Indexed: 12/18/2022] Open
Abstract
In the vast majority of cases, glomerular filtration rate (GFR) is estimated using serum creatinine, which is highly influenced by age, sex, muscle mass, body composition, severe chronic illness and many other factors. This often leads to misclassification of patients or potentially puts patients at risk for inappropriate clinical decisions. Possible solutions are the use of cystatin C as an alternative endogenous marker or performing direct measurement of GFR using an exogenous marker such as iohexol. The purpose of this review is to highlight clinical scenarios and conditions such as extreme body composition, Black race, disagreement between creatinine- and cystatin C-based estimated GFR (eGFR), drug dosing, liver cirrhosis, advanced chronic kidney disease and the transition to kidney replacement therapy, non-kidney solid organ transplant recipients and living kidney donors where creatinine-based GFR estimation may be invalid. In contrast to the majority of literature on measured GFR (mGFR), this review does not include aspects of mGFR for research or public health settings but aims to reach practicing clinicians and raise their understanding of the substantial limitations of creatinine. While including cystatin C as a renal biomarker in GFR estimating equations has been shown to increase the accuracy of the GFR estimate, there are also limitations to eGFR based on cystatin C alone or the combination of creatinine and cystatin C in the clinical scenarios described above that can be overcome by measuring GFR with an exogenous marker. We acknowledge that mGFR is not readily available in many centres but hope that this review will highlight and promote the expansion of kidney function diagnostics using standardized mGFR procedures as an important milestone towards more accurate and personalized medicine.
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Affiliation(s)
- Natalie Ebert
- Institute of Public Health, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Sebastjan Bevc
- Department of Nephrology, Faculty of Medicine, Clinic for Internal Medicine, University Medical Center Maribor, University of Maribor, Maribor, Slovenia
| | - Arend Bökenkamp
- Department of Pediatric Nephrology, Amsterdam University Medical Center, Emma Kinderziekenhuis, Amsterdam, The Netherlands
| | - Francois Gaillard
- AP-HP, Hôpital Bichat, Service de Néphrologie, Université de Paris, INSERM U1149, Paris, France
| | - Mads Hornum
- Department of Nephrology, Rigshospitalet and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Kitty J Jager
- Department of Medical Informatics, ERA-EDTA Registry, Amsterdam Public Health Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | | | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
| | - Runolfur Palsson
- Internal Medicine Services, Division of Nephrology, Landspitali–The National University Hospital of Iceland and Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - Andrew D Rule
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA
| | - Marco van Londen
- Department of Internal Medicine, Division of Nephrology, University Medical Center Groningen, Groningen, The Netherlands
| | - Christine White
- Department of Medicine, Division of Nephrology, Queen’s University, Kingston, Canada
| | - Elke Schaeffner
- Institute of Public Health, Charité Universitätsmedizin Berlin, Berlin, Germany
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15
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Söderström E, Blind R, Wennberg P, Andersson J, Söderberg S, Nilsson TK, Hultdin J. Mild impairment of renal function (shrunken pore syndrome) is associated with increased risk of a future first-ever myocardial infarction in women. Scandinavian Journal of Clinical and Laboratory Investigation 2021; 81:438-445. [PMID: 34237228 DOI: 10.1080/00365513.2021.1941235] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Impaired renal function is associated both with the development of cardiovascular disease and its prognosis. A new syndrome called 'Shrunken Pore Syndrome' has been suggested, as the estimated glomerular filtration rate for cystatin C (eGFRcystatin C) is affected earlier due to differences in molecular size compared to eGFRcreatinine. The aim was to investigate if a lower eGFRcystatin C/eGFRcreatinine ratio in a prospective setting increases the risk of later developing a first-ever myocardial infarction (MI) independently of other cardiovascular risk factors. We used a nested case-referent study design within the Northern Sweden Health and Disease Study, and 545 subjects (29.0% women) were identified who prospectively developed a first-ever MI, and their 1054 matched referents. For women, but not for men, one standard deviation (SD) increase of ln z-scores of eGFRcystatin C/eGFRcreatinine ratio was associated with a lower risk of a future MI: odds ratio [95% confidence interval] 0.58 [0.34-0.99], adjusted for apolipoprotein B/A1 ratio, CRP, homocysteine, systolic blood pressure, body mass index, and diabetes. Furthermore, a high eGFRcreatinine associated independently with an increased risk of future MI in men only: OR 1.25 [1.05-1.48]. Thus, for women, a lower eGFRcystatin C/eGFRcreatinine ratio is associated with a higher risk of having a future first-ever MI, and it may be a valuable, easily implemented biomarker for risk of cardiovascular disease.
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Affiliation(s)
- Elisabet Söderström
- Department of Medical Biosciences, Clinical Chemistry, Norrbotten County Council, Sunderby Hospital, Umeå University, Umeå, Sweden
| | - Ravna Blind
- Department of Medical Biosciences, Clinical Chemistry, Norrbotten County Council, Sunderby Hospital, Umeå University, Umeå, Sweden
| | - Patrik Wennberg
- Department of Public Health and Clinical Medicine, Family Medicine, Umeå University, Umeå, Sweden
| | - Jonas Andersson
- Department of Public Health and Clinical Medicine, Skellefteå Research Unit, Umeå University, Umeå, Sweden
| | - Stefan Söderberg
- Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
| | - Torbjörn K Nilsson
- Department of Medical Biosciences, Clinical Chemistry, Umeå University, Umeå, Sweden
| | - Johan Hultdin
- Department of Medical Biosciences, Clinical Chemistry, Umeå University, Umeå, Sweden
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16
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Nordvåg SK, Solbu MD, Melsom T, Nissen FI, Andreasen C, Borgen TT, Eriksen BO, Joakimsen RM, Bjørnerem Å. Estimated Glomerular Filtration Rate (eGFR) based on cystatin C was associated with increased risk of hip and proximal humerus fractures in women and decreased risk of hip fracture in men, whereas eGFR based on creatinine was not associated with fracture risk in both sexes: The Tromsø Study. Bone 2021; 148:115960. [PMID: 33864977 DOI: 10.1016/j.bone.2021.115960] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/22/2021] [Accepted: 04/11/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE Patients with end-stage kidney disease have an increased fracture risk. Whether mild to moderate reductions in kidney function is associated with increased fracture risk is uncertain. Results from previous studies may be confounded by muscle mass because of the use of creatinine-based estimates of the glomerular filtration rate (eGFRcre). We tested the hypothesis that lower eGFR within the normal range of kidney function based on serum cystatin C (eGFRcys) or both cystatin C and creatinine (eGFRcrecys) predict fractures better than eGFR based on creatinine (eGFRcre). METHODS In the Tromsø Study 1994-95, a cohort of 3016 women and 2836 men aged 50-84 years had eGFRcre, eGFRcys and eGFRcrecys estimated using the Chronic Kidney Disease Epidemiology Collaboration equations. Hazard ratios (HRs) (95% confidence intervals) for fracture were calculated in Cox's proportional hazards models and adjusted for age, height, body mass index, bone mineral density, diastolic blood pressure, smoking, physical activity, previous fracture, diabetes and cardiovascular disease. RESULTS During a median of 14.6 years follow-up, 232, 135 and 394 women and 118, 35 and 65 men suffered incident hip, proximal humerus and wrist fractures. In women, lower eGFRcre did not predict fracture, but the risk for hip and proximal humerus fracture increased per standard deviation (SD) lower eGFRcys (HRs 1.36 (1.16-1.60) and 1.33 (1.08-1.63)) and per SD lower eGFRcrecys (HRs 1.25 (1.08-1.45) and 1.30 (1.07-1.57)). In men, none of the eGFR estimates were related to increased fracture risk. In contrast, eGFRcys and eGFRcrecys were inversely associated with hip fracture risk (HRs 0.85 (0.73-0.99) and 0.82 (0.68-0.98)). CONCLUSIONS In women, each SD lower eGFRcys and eGFRcrecys increased the risk of hip and proximal humerus fracture by 25-36%, whereas eGFRcre did not. In men, none of the estimates of eGFR were related to increased fracture risk, and each SD lower eGFRcys and eGFRcrecys decreased the risk of hip fracture by 15-18%. The findings particularly apply to a cohort of generally healthy individuals with a normal kidney function. In future studies, the association of measured GFR using the gold standard method of iohexol clearance with fractures risk should be examined for causal inference. More clinical research is needed before robust clinical inferences can be made.
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Affiliation(s)
- Sofie K Nordvåg
- Women's Health and Perinatalogy Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway
| | - Marit D Solbu
- Metabolic and Renal Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Frida I Nissen
- Women's Health and Perinatalogy Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway; Department of Gynecology and Obstetrics, University Hospital of North Norway, Tromsø, Norway; Department of Orthopedic Surgery, University Hospital of North Norway, Tromsø, Norway
| | - Camilla Andreasen
- Women's Health and Perinatalogy Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway; Department of Orthopedic Surgery, University Hospital of North Norway, Tromsø, Norway
| | - Tove T Borgen
- Department of Rheumatology, Vestre Viken Hospital Trust, Drammen Hospital, Drammen, Norway
| | - Bjørn O Eriksen
- Metabolic and Renal Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Ragnar M Joakimsen
- Department of Internal Medicine, University Hospital of North Norway, Tromsø, Norway; Endocrinology Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway
| | - Åshild Bjørnerem
- Women's Health and Perinatalogy Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway; Department of Gynecology and Obstetrics, University Hospital of North Norway, Tromsø, Norway; Norwegian Research Centre for Women's Health, Oslo University Hospital, Oslo, Norway.
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17
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Association of High-Density Lipoprotein Cholesterol With GFR Decline in a General Nondiabetic Population. Kidney Int Rep 2021; 6:2084-2094. [PMID: 34386657 PMCID: PMC8343778 DOI: 10.1016/j.ekir.2021.05.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 04/16/2021] [Accepted: 05/06/2021] [Indexed: 11/22/2022] Open
Abstract
Introduction Although lower high-density lipoprotein cholesterol (HDL-C) levels are considered a risk factor for cardiovascular disease (CVD), experimental evidence suggest that aging, inflammation, and oxidative stress may remodel HDL-C, leading to dysfunctional HDL-C. Population studies on HDL-C and loss of the glomerular filtration rate (GFR) reported inconsistent results, but they used inaccurate estimates of the GFR and may have been confounded by comorbidity. Methods We investigated the association of HDL-C levels with risk of GFR loss in a general population cohort; the participants were aged 50-62 years and did not have diabetes, CVD, or chronic kidney disease (CKD) at baseline. The GFR was measured using iohexol-clearance at baseline (n=1627) and at the follow-up (n=1324) after a median of 5.6 years. We also investigated any possible effect modification by low-grade inflammation, physical activity, and sex. Results Higher HDL-C levels were associated with steeper GFR decline rates and increased risk of rapid GFR decline (>3 ml/min per 1.73 m2 per year) in multivariable adjusted linear mixed models and logistic regression (-0.64 ml/min per 1.73 m2 per year [95% CI -0.99, -0.29; P < 0.001] and odds ratio 2.7 [95% CI 1.4, 5.2; P < 0.001] per doubling in HDL-C). Effect modifications indicated a stronger association between high HDL-C and GFR loss in physically inactive persons, those with low-grade inflammation, and men. Conclusion Higher HDL-C levels were independently associated with accelerated GFR loss in a general middle-aged nondiabetic population.
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Helmersson-Karlqvist J, Lipcsey M, Ärnlöv J, Bell M, Ravn B, Dardashti A, Larsson A. Cystatin C predicts long term mortality better than creatinine in a nationwide study of intensive care patients. Sci Rep 2021; 11:5882. [PMID: 33723337 PMCID: PMC7961058 DOI: 10.1038/s41598-021-85370-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 03/01/2021] [Indexed: 02/07/2023] Open
Abstract
Decreased glomerular filtration rate (GFR) is linked to poor survival. The predictive value of creatinine estimated GFR (eGFR) and cystatin C eGFR in critically ill patients may differ substantially, but has been less studied. This study compares long-term mortality risk prediction by eGFR using a creatinine equation (CKD-EPI), a cystatin C equation (CAPA) and a combined creatinine/cystatin C equation (CKD-EPI), in 22,488 patients treated in intensive care at three University Hospitals in Sweden, between 2004 and 2015. Patients were analysed for both creatinine and cystatin C on the same blood sample tube at admission, using accredited laboratory methods. During follow-up (median 5.1 years) 8401 (37%) patients died. Reduced eGFR was significantly associated with death by all eGFR-equations in Cox regression models. However, patients reclassified to a lower GFR-category by using the cystatin C-based equation, as compared to the creatinine-based equation, had significantly higher mortality risk compared to the referent patients not reclassified. The cystatin C equation increased C-statistics for death prediction (p < 0.001 vs. creatinine, p = 0.013 vs. combined equation). In conclusion, this data favours the sole cystatin C equation rather than the creatinine or combined equations when estimating GFR for risk prediction purposes in critically ill patients.
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Affiliation(s)
| | - Miklos Lipcsey
- Hedenstierna Laboratory, CIRRUS, Department of Surgical Sciences, Anesthesiology and Intensive Care, Uppsala University, Uppsala, Sweden
| | - Johan Ärnlöv
- Division of Family Medicine and Primary Care, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Huddinge, Sweden.,School of Health and Social Studies, Dalarna University, Falun, Sweden
| | - Max Bell
- Department of Anesthesiology, Surgical Services and Intensive Care, Karolinska University Hospital, Stockholm, Sweden.,Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Bo Ravn
- Department of Anesthesiology, Surgical Services and Intensive Care, Karolinska University Hospital, Stockholm, Sweden.,Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Alain Dardashti
- Department of Cardiothoracic Surgery, Anesthesia and Intensive Care, Skane University Hospital, Lund, Sweden
| | - Anders Larsson
- Department of Medical Sciences/Clinical Chemistry, Uppsala University, 751 85, Uppsala, Sweden
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19
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Serum uric acid, predicts heart failure in a large Italian cohort: search for a cut-off value the URic acid Right for heArt Health study. J Hypertens 2020; 39:62-69. [PMID: 32694342 DOI: 10.1097/hjh.0000000000002589] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To assess the prognostic cut-off values of serum uric acid (SUA) in predicting fatal and morbid heart failure in a large Italian cohort in the frame of the Working Group on Uric Acid and Cardiovascular Risk of the Italian Society of Hypertension. METHODS The URic acid Right for heArt Health (URRAH) study is a nationwide, multicentre, cohort study involving data on individuals aged 18-95 years, recruited on a community basis from all regions of Italy under the patronage of the Italian Society of Hypertension with a mean follow-up period of 128 ± 65 months. Incident heart failure was defined on the basis of International Classification of Diseases Tenth Revision codes and double-checked with general practitioners and hospital files. Multivariate Cox regression models having fatal and morbid heart failure as dependent variables, adjusted for sex, age, SBP, diabetes, estimated glomerular filtration rate, smoking habit, ethanol intake, BMI, haematocrit, LDL cholesterol, previous diagnosis of heart failure and use of diuretics as possible confounders, were used to search for an association between SUA as a continuous variable and heart failure. By means of receiver operating characteristic curves, two prognostic cut-off values (one for all heart failure and one for fatal heart failure) were identified as able to discriminate between individuals doomed to develop the event. These cut-off values were used as independent predictors to divide individuals according to prognostic cut-off values in a multivariate Cox models, adjusted for confounders. RESULTS A total of 21 386 individuals were included in the analysis. In Cox analyses, SUA as a continuous variable was a significant predictor of all [hazard ratio 1.29 (1.23-1.359), P < 0.0001] and fatal [hazard ratio 1.268 (1.121-1.35), P < 0.0001] incident heart failure. Cut-off values of SUA able to discriminate all and fatal heart failure status were identified by mean of receiver operating characteristic curves in the whole database: SUA more than 5.34 mg/dl (confidence interval 4.37-5.6, sensitivity 52.32, specificity 63.96, P < 0.0001) was the univariate prognostic cut-off value for all heart failure, whereas SUA more than 4.89 mg/dl (confidence interval 4.78-5.78, sensitivity 68.29, specificity 49.11, P < 0.0001) for fatal heart failure. The cut-off for all heart failure and the cut-off value for fatal heart failure were accepted as independent predictors in the Cox analysis models, the hazard ratios being 1.645 (1.284-2.109, P < 0.0001) for all heart failure and 1.645 (1.284-2.109, P < 0.0001) for fatal heart failure, respectively. CONCLUSION The results of the current study confirm that SUA is an independent risk factor for all heart failure and fatal heart failure, after adjusting for potential confounding variables and demonstrate that a prognostic cut-off value can be identified for all heart failure (>5.34 mg/dl) and for fatal heart failure (>4.89 mg/dl).
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20
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Eriksen BO, Palsson R, Ebert N, Melsom T, van der Giet M, Gudnason V, Indridason OS, Inker LA, Jenssen TG, Levey AS, Solbu MD, Tighiouart H, Schaeffner E. GFR in Healthy Aging: an Individual Participant Data Meta-Analysis of Iohexol Clearance in European Population-Based Cohorts. J Am Soc Nephrol 2020; 31:1602-1615. [PMID: 32499396 DOI: 10.1681/asn.2020020151] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 04/07/2020] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Population mean GFR is lower in older age, but it is unknown whether healthy aging is associated with preserved rather than lower GFR in some individuals. METHODS We investigated the cross-sectional association between measured GFR, age, and health in persons aged 50-97 years in the general population through a meta-analysis of iohexol clearance measurements in three large European population-based cohorts. We defined a healthy person as having no major chronic disease or risk factors for CKD and all others as unhealthy. We used a generalized additive model to study GFR distribution by age according to health status. RESULTS There were 935 (22%) GFR measurements in persons who were healthy and 3274 (78%) in persons who were unhealthy. The mean GFR was lower in older age by -0.72 ml/min per 1.73 m2 per year (95% confidence interval [95% CI], -0.96 to -0.48) for men who were healthy versus -1.03 ml/min per 1.73 m2 per year (95% CI, -1.25 to -0.80) for men who were unhealthy, and by -0.92 ml/min per 1.73 m2 per year (95% CI, -1.14 to -0.70) for women who were healthy versus -1.22 ml/min per 1.73 m2 per year (95% CI, -1.43 to -1.02) for women who were unhealthy. For healthy and unhealthy people of both sexes, both the 97.5th and 2.5th GFR percentiles exhibited a negative linear association with age. CONCLUSIONS Healthy aging is associated with a higher mean GFR compared with unhealthy aging. However, both the mean and 97.5 percentiles of the GFR distribution are lower in older persons who are healthy than in middle-aged persons who are healthy. This suggests that healthy aging is not associated with preserved GFR in old age.
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Affiliation(s)
- Bjørn O Eriksen
- Metabolic and Renal Research Group, University of Tromsø - The Arctic University of Norway, Tromsø, Norway .,Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Runolfur Palsson
- Division of Nephrology, Landspitali-The National University Hospital of Iceland, Reykjavik, Iceland.,University of Iceland, Reykjavik, Iceland
| | - Natalie Ebert
- Institute of Public Health, Charité - Berlin University of Medicine, Berlin, Germany
| | - Toralf Melsom
- Metabolic and Renal Research Group, University of Tromsø - The Arctic University of Norway, Tromsø, Norway.,Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Markus van der Giet
- Department of Nephrology, Charité - Berlin University of Medicine, Berlin, Germany
| | - Vilmundur Gudnason
- University of Iceland, Reykjavik, Iceland.,Icelandic Heart Association, Kopavogur, Iceland
| | - Olafur S Indridason
- Division of Nephrology, Landspitali-The National University Hospital of Iceland, Reykjavik, Iceland
| | - Lesley A Inker
- Division of Nephrology, Tufts Medical Center, Boston, Massachusetts
| | - Trond G Jenssen
- Metabolic and Renal Research Group, University of Tromsø - The Arctic University of Norway, Tromsø, Norway.,Department of Organ Transplantation, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Andrew S Levey
- Division of Nephrology, Tufts Medical Center, Boston, Massachusetts
| | - Marit D Solbu
- Metabolic and Renal Research Group, University of Tromsø - The Arctic University of Norway, Tromsø, Norway.,Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Hocine Tighiouart
- Institute for Clinical Research and Health Policy Studies, Tufts Medical Center, Boston, Massachusetts.,Tufts Clinical and Translational Science Institute, Tufts University, Boston, Massachusetts
| | - Elke Schaeffner
- Institute of Public Health, Charité - Berlin University of Medicine, Berlin, Germany
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21
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Rodriguez-Poncelas A, Coll-de-Tuero G, Blanch J, Comas-Cufí M, Saez M, Barceló MA. Prediabetes is associated with glomerular hyperfiltration in a European Mediterranean cohort study. J Nephrol 2018; 31:743-749. [PMID: 30151699 DOI: 10.1007/s40620-018-0524-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 08/12/2018] [Indexed: 12/16/2022]
Abstract
BACKGROUND Glomerular hyperfiltration is well recognized as an early renal alteration in subjects with diabetes mellitus. However, what is not well-known is whether hyperfiltration also occurs in the early stages of hyperglycaemia, for instance in prediabetes. Identifying subjects with glomerular hyperfiltration from among those with prediabetes might be helpful to implement preventive and therapeutic strategies. This study aimed to investigate the association of prediabetes with glomerular hyperfiltration and its associated variables. METHODS A representative sample of 9238 people aged ≥ 30 years and whose entire clinical and laboratory data were available, were included in this study. Hyperfiltration was defined as an estimated glomerular filtration rate (eGFR) above the age- and gender-specific 95th percentile. The eGFR was assessed using the Chronic Kidney Disease Epidemiology Collaboration equation. RESULTS After adjustment for age, gender, body mass index, systolic blood pressure and diastolic blood pressure, cholesterol, log (triglycerides), high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, serum uric acid, smoking status, hypertension, and use of angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, fasting plasma glucose (FPG) was found to be independently positively associated with eGFR. The hazard ratios (95% confidence interval) for hyperfiltration were 1.61 (1.28-2.03) and 2.30 (1.89-2.79) for prediabetes and diabetes, respectively, when compared with participants with normoglycemia. CONCLUSION Prediabetes was associated with glomerular hyperfiltration. Longitudinal studies are needed to investigate whether hyperfiltration in prediabetes is associated with a later decline in eGFR.
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Affiliation(s)
| | - Gabriel Coll-de-Tuero
- METHARISC Group, USR Girona, IdIAP Gol i Gorina, Girona, Spain.,Department of Medical Sciences, University of Girona, Girona, Spain.,CIBER of Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Jordi Blanch
- METHARISC Group, USR Girona, IdIAP Gol i Gorina, Girona, Spain
| | - Marc Comas-Cufí
- METHARISC Group, USR Girona, IdIAP Gol i Gorina, Girona, Spain
| | - Marc Saez
- METHARISC Group, USR Girona, IdIAP Gol i Gorina, Girona, Spain. .,CIBER of Epidemiology and Public Health (CIBERESP), Madrid, Spain. .,Research Group on Statistics, Econometrics and Health (GRECS), University of Girona, Carrer de la Universitat de Girona 10, Campus de Montilivi, 17003, Girona, Spain.
| | - Maria Antònia Barceló
- METHARISC Group, USR Girona, IdIAP Gol i Gorina, Girona, Spain.,CIBER of Epidemiology and Public Health (CIBERESP), Madrid, Spain.,Research Group on Statistics, Econometrics and Health (GRECS), University of Girona, Carrer de la Universitat de Girona 10, Campus de Montilivi, 17003, Girona, Spain
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22
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Metabolic syndrome but not obesity measures are risk factors for accelerated age-related glomerular filtration rate decline in the general population. Kidney Int 2018; 93:1183-1190. [DOI: 10.1016/j.kint.2017.11.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 11/13/2017] [Accepted: 11/16/2017] [Indexed: 02/06/2023]
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23
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Pottel H, Delanaye P, Schaeffner E, Dubourg L, Eriksen BO, Melsom T, Lamb EJ, Rule AD, Turner ST, Glassock RJ, De Souza V, Selistre L, Goffin K, Pauwels S, Mariat C, Flamant M, Ebert N. Estimating glomerular filtration rate for the full age spectrum from serum creatinine and cystatin C. Nephrol Dial Transplant 2017; 32:497-507. [PMID: 28089986 DOI: 10.1093/ndt/gfw425] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 11/06/2016] [Indexed: 11/13/2022] Open
Abstract
Background We recently published and validated the new serum creatinine (Scr)-based full-age-spectrum equation (FAS crea ) for estimating the glomerular filtration rate (GFR) for healthy and kidney-diseased subjects of all ages. The equation was based on the concept of normalized Scr and shows equivalent to superior prediction performance to the currently recommended equations for children, adolescents, adults and older adults. Methods Based on an evaluation of the serum cystatin C (ScysC) distribution, we defined normalization constants for ScysC ( Q cysC = 0.82 mg/L for ages <70 years and Q cysC = 0.95 mg/L for ages ≥70 years). By replacing Scr/ Q crea in the FAS crea equation with ScysC/ Q cysC , or with the average of both normalized biomarkers, we obtained new ScysC-based (FAS cysC ) and combined Scr-/ScysC-based FAS equations (FAS combi ). To validate the new FAS cysC and FAS combi we collected data on measured GFR, Scr, ScysC, age, gender, height and weight from 11 different cohorts including n = 6132 unique white subjects (368 children, aged ≤18 years, 4295 adults and 1469 older adults, aged ≥70 years). Results In children and adolescents, the new FAS cysC equation showed significantly better performance [percentage of patients within 30% of mGFR (P30) = 86.1%] than the Caucasian Asian Paediatric Adult Cohort equation (P30 = 76.6%; P < 0.0001), or the ScysC-based Schwartz equation (P30 = 68.8%; P < 0.0001) and the FAS combi equation outperformed all equations with P30 = 92.1% (P < 0.0001). In adults, the FAS cysC equation (P30 = 82.6%) performed equally as well as the Chronic Kidney Disease Epidemiology Collaboration equation (CKD-EPI cysC ) (P30 = 80.4%) and the FAS combi equation (P30 = 89.9%) was also equal to the combined CKD-EPI equation (P30 = 88.2%). In older adults, FAS cysC was superior (P30 = 88.2%) to CKD-EPI cysC (P30 = 84.4%; P < 0.0001) and the FAS combi equation (P30 = 91.2%) showed significantly higher performance than the combined CKD-EPI equation (P30 = 85.6%) (P < 0.0001). Conclusion The FAS equation is not only applicable to all ages, but also for all recommended renal biomarkers and their combinations.
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Affiliation(s)
- Hans Pottel
- Department of Public Health and Primary Care, KU Leuven Campus Kulak Kortrijk, Kortrijk, Belgium
| | - Pierre Delanaye
- Nephrology-Dialysis-Transplantation, University of Liège, CHU Sart Tilman, Liège, Belgium
| | - Elke Schaeffner
- Charité University Hospital, Institute of Public Health, Berlin, Germany
| | - Laurence Dubourg
- Exploration Fonctionnelle Rénale, Groupement Hospitalier Edouard Herriot, Hospices Civils de Lyon, Lyon, France
| | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
| | - Edmund J Lamb
- Clinical Biochemistry, East Kent Hospitals University NHS Foundation Trust, Canterbury, UK
| | - Andrew D Rule
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA
| | - Stephen T Turner
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA
| | - Richard J Glassock
- Emeritus Professor of Medicine, Geffen School of Medicine at UCLA, Laguna Niguel, CA, USA
| | - Vandréa De Souza
- Universidade de Caxias do Sul - Programa de Pós Graduação em Ciências da Saúde, Brazil
| | - Luciano Selistre
- Universidade de Caxias do Sul - Programa de Pós Graduação em Ciências da Saúde, Brazil.,Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Karolien Goffin
- Department of Nuclear Medicine & Molecular Imaging, University Hospital Leuven, Leuven, Belgium
| | - Steven Pauwels
- Department of Cardiovascular Sciences, University Hospital Leuven, Leuven, Belgium.,Department of Laboratory Medicine, University Hospital Leuven, Leuven, Belgium
| | - Christophe Mariat
- Service de Néphrologie, Dialyse et Transplantation Rénale, Hôpital Nord, CHU de Saint-Etienne, France
| | - Martin Flamant
- Department of Renal Physiology, Hôpital Bichat, AP-HP and Paris Diderot University, Paris, France
| | - Natalie Ebert
- Charité University Hospital, Institute of Public Health, Berlin, Germany
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Alaini A, Malhotra D, Rondon-Berrios H, Argyropoulos CP, Khitan ZJ, Raj DSC, Rohrscheib M, Shapiro JI, Tzamaloukas AH. Establishing the presence or absence of chronic kidney disease: Uses and limitations of formulas estimating the glomerular filtration rate. World J Methodol 2017; 7:73-92. [PMID: 29026688 PMCID: PMC5618145 DOI: 10.5662/wjm.v7.i3.73] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 05/17/2017] [Accepted: 05/30/2017] [Indexed: 02/06/2023] Open
Abstract
The development of formulas estimating glomerular filtration rate (eGFR) from serum creatinine and cystatin C and accounting for certain variables affecting the production rate of these biomarkers, including ethnicity, gender and age, has led to the current scheme of diagnosing and staging chronic kidney disease (CKD), which is based on eGFR values and albuminuria. This scheme has been applied extensively in various populations and has led to the current estimates of prevalence of CKD. In addition, this scheme is applied in clinical studies evaluating the risks of CKD and the efficacy of various interventions directed towards improving its course. Disagreements between creatinine-based and cystatin-based eGFR values and between eGFR values and measured GFR have been reported in various cohorts. These disagreements are the consequence of variations in the rate of production and in factors, other than GFR, affecting the rate of removal of creatinine and cystatin C. The disagreements create limitations for all eGFR formulas developed so far. The main limitations are low sensitivity in detecting early CKD in several subjects, e.g., those with hyperfiltration, and poor prediction of the course of CKD. Research efforts in CKD are currently directed towards identification of biomarkers that are better indices of GFR than the current biomarkers and, particularly, biomarkers of early renal tissue injury.
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Affiliation(s)
- Ahmed Alaini
- Division of Nephrology, Department of Medicine, University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Deepak Malhotra
- Division of Nephrology, Department of Medicine, University of Toledo School of Medicine, Toledo, OH 43614-5809, United States
| | - Helbert Rondon-Berrios
- Renal and Electrolyte Division, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15260, United States
| | - Christos P Argyropoulos
- Division of Nephrology, Department of Medicine, University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Zeid J Khitan
- Division of Nephrology, Department of Medicine, Joan C. Edwards School of Medicine, Huntington, WV 25701, United States
| | - Dominic S C Raj
- Division of Nephrology, Department of Medicine, George Washington University, Washington, DC 20037, United States
| | - Mark Rohrscheib
- Division of Nephrology, Department of Medicine, University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Joseph I Shapiro
- Marshall University Joan C. Edwards School of Medicine, Huntington, WV 25701, United States
| | - Antonios H Tzamaloukas
- Nephrology Section, Medicine Service, Raymond G. Murphy VA Medical Center, Albuquerque, NM 87108, United States
- Department of Medicine, University of New Mexico School of Medicine, Albuquerque, NM 87108, United States
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Pottel H, Dubourg L, Schaeffner E, Eriksen BO, Melsom T, Lamb EJ, Rule AD, Turner ST, Glassock RJ, De Souza V, Selistre L, Goffin K, Pauwels S, Mariat C, Flamant M, Bevc S, Delanaye P, Ebert N. The diagnostic value of rescaled renal biomarkers serum creatinine and serum cystatin C and their relation with measured glomerular filtration rate. Clin Chim Acta 2017; 471:164-170. [PMID: 28601669 DOI: 10.1016/j.cca.2017.06.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 06/06/2017] [Accepted: 06/06/2017] [Indexed: 11/30/2022]
Abstract
BACKGROUND Serum creatinine (Scr) is the major contributing variable in glomerular filtration rate (GFR) estimating equations. Serum cystatin C (ScysC) based GFR estimating (eGFR)-equations have also been developed. The present study investigates the relation between 'rescaled' levels of these renal biomarkers (with reference interval of [0.67-1.33]) and measured GFR (mGFR). METHODS We evaluated the diagnostic ability to detect impaired kidney function of the rescaled renal biomarkers in 8584 subjects from 12 cohorts with measured GFR, standardized Scr and ScysC. We calculated sensitivity and specificity of the rescaled biomarkers to identify kidney disease, with reference to a fixed (60mL/min/1.73m2) as well as an age-dependent threshold for mGFR. RESULTS The upper reference limit of 1.33 for rescaled renal biomarkers is closely related to the age-dependent threshold for defining kidney status by mGFR with sensitivity and specificity for the rescaled biomarkers close to 90% for all ages. If the fixed threshold of 60mL/min/1.73m2 for mGFR is used, then lower specificity in children and sensitivity in older adults are observed. CONCLUSIONS Impaired kidney function can be diagnosed by rescaled renal biomarkers instead of eGFR-equations using the fixed threshold of 1.33 for all ages, consistent with an age-dependent threshold of mGFR.
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Affiliation(s)
- Hans Pottel
- Department of Public Health and Primary Care, KU Leuven Campus Kulak Kortrijk, Kortrijk, Belgium.
| | - Laurence Dubourg
- Exploration Fonctionnelle Rénale, Groupement Hospitalier Edouard Herriot, Hospices Civils de Lyon, Lyon, France
| | - Elke Schaeffner
- Charité University Hospital, Institute of Public Health, Berlin, Germany
| | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
| | - Edmund J Lamb
- Clinical Biochemistry, East Kent Hospitals University NHS Foundation Trust, Canterbury, Kent, United Kingdom
| | - Andrew D Rule
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA
| | - Stephen T Turner
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA
| | | | - Vandréa De Souza
- Universidade de Caxias do Sul, Programa de Pós Graduação em Ciências da Saúde, Brazil
| | - Luciano Selistre
- Universidade de Caxias do Sul, Programa de Pós Graduação em Ciências da Saúde, Brazil; Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Karolien Goffin
- Department of Nuclear Medicine & Molecular Imaging, University Hospital Leuven, Leuven, Belgium
| | - Steven Pauwels
- Department of Cardiovascular Sciences, Department of Laboratory Medicine, University Hospital Leuven, Leuven, Belgium
| | - Christophe Mariat
- Service de Néphrologie, Dialyse et Transplantation Rénale, Hôpital Nord, CHU de Saint-Etienne, France
| | - Martin Flamant
- Department of Renal Physiology, Hôpital Bichat, AP-HP and Paris Diderot University, Paris, France
| | - Sebastjan Bevc
- University Medical Centre Maribor, Clinic for Internal Medicine, Department of Nephrology, Maribor, Slovenia
| | - Pierre Delanaye
- Nephrology-Dialysis-Transplantation, University of Liège, CHU Sart Tilman, Liège, Belgium
| | - Natalie Ebert
- Charité University Hospital, Institute of Public Health, Berlin, Germany
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26
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Sundin PO, Sjöström P, Jones I, Olsson LA, Udumyan R, Grubb A, Lindström V, Montgomery S. Measured glomerular filtration rate does not improve prediction of mortality by cystatin C and creatinine. Nephrol Dial Transplant 2017; 32:663-670. [PMID: 28340079 DOI: 10.1093/ndt/gfx004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Accepted: 12/29/2016] [Indexed: 01/05/2023] Open
Abstract
Background Cystatin C may add explanatory power for associations with mortality in combination with other filtration markers, possibly indicating pathways other than glomerular filtration rate (GFR). However, this has not been firmly established since interpretation of associations independent of measured GFR (mGFR) is limited by potential multicollinearity between markers of GFR. The primary aim of this study was to assess associations between cystatin C and mortality, independent of mGFR. A secondary aim was to evaluate the utility of combining cystatin C and creatinine to predict mortality risk. Methods Cox regression was used to assess the associations of cystatin C and creatinine with mortality in 1157 individuals referred for assessment of plasma clearance of iohexol. Results Since cystatin C and creatinine are inversely related to mGFR, cystatin C - 1 and creatinine - 1 were used. After adjustment for mGFR, lower cystatin C - 1 (higher cystatin C concentration) and higher creatinine - 1 (lower creatinine concentration) were independently associated with increased mortality. When nested models were compared, avoiding the potential influence of multicollinearity, the independence of the associations was supported. Among models combining the markers of GFR, adjusted for demographic factors and comorbidity, cystatin C - 1 and creatinine - 1 combined explained the largest proportion of variance in associations with mortality risk ( R 2 = 0.61). Addition of mGFR did not improve the model. Conclusions Our results suggest that both creatinine and cystatin C have independent associations with mortality not explained entirely by mGFR and that mGFR does not offer a more precise mortality risk assessment than these endogenous filtration markers combined.
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Affiliation(s)
- Per-Ola Sundin
- School of Medical Sciences, Örebro University, SE 701 82 Örebro, Sweden
| | - Per Sjöström
- School of Medical Sciences, Örebro University, SE 701 82 Örebro, Sweden
| | - Ian Jones
- School of Medical Sciences, Örebro University, SE 701 82 Örebro, Sweden
| | - Lovisa A Olsson
- School of Medical Sciences, Örebro University, SE 701 82 Örebro, Sweden
| | - Ruzan Udumyan
- Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Anders Grubb
- Department of Clinical Chemistry, Laboratory Medicine, University Hospital, Lund, Sweden
| | - Veronica Lindström
- Department of Clinical Chemistry, Laboratory Medicine, University Hospital, Lund, Sweden
| | - Scott Montgomery
- Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden.,Clinical Epidemiology Unit, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.,Department of Epidemiology and Public Health, University College, London, UK
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27
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Schei J, Stefansson VTN, Eriksen BO, Jenssen TG, Solbu MD, Wilsgaard T, Melsom T. Association of TNF Receptor 2 and CRP with GFR Decline in the General Nondiabetic Population. Clin J Am Soc Nephrol 2017; 12:624-634. [PMID: 28153935 PMCID: PMC5383389 DOI: 10.2215/cjn.09280916] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 12/19/2016] [Indexed: 01/15/2023]
Abstract
BACKGROUND AND OBJECTIVES Higher levels of inflammatory markers have been associated with renal outcomes in diabetic populations. We investigated whether soluble TNF receptor 2 (TNFR2) and high-sensitivity C-reactive protein (hsCRP) were associated with the age-related GFR decline in a nondiabetic population using measured GFR (mGFR). DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS A representative sample of 1590 middle-aged people from the general population without prevalent kidney disease, diabetes, or cardiovascular disease were enrolled in the Renal Iohexol-Clearance Survey in Tromsø 6 (RENIS-T6) between 2007 and 2009. After a median of 5.6 years, 1296 persons were included in the Renal Iohexol-Clearance Survey Follow-Up Study. GFR was measured using iohexol clearance at baseline and follow-up. RESULTS The mean decline of mGFR during the period was -0.84 ml/min per 1.73 m2 per year. There were 133 participants with rapid mGFR decline, defined as an annual mGFR loss >3.0 ml/min per 1.73 m2, and 26 participants with incident CKD, defined as mGFR<60 ml/min per 1.73 m2 at follow-up. In multivariable adjusted mixed models, 1 mg/L higher levels of hsCRP were associated with an accelerated decline in mGFR of -0.03 ml/min per 1.73 m2 per year (95% confidence interval [95% CI], -0.05 to -0.01), and 1 SD higher TNFR2 was associated with a slower decline in mGFR (0.09 ml/min per 1.73 m2 per year; 95% CI, 0.01 to 0.18). In logistic regression models adjusted for sex, age, weight, and height, 1 mg/L higher levels of hsCRP were associated with higher risk of rapid mGFR decline (odds ratio, 1.03; 95% CI, 1.01 to 1.06) and incident CKD (odds ratio, 1.04; 95% CI, 1.00 to 1.08). CONCLUSIONS Higher baseline levels of hsCRP but not TNFR2 were associated with accelerated age-related mGFR decline and incident CKD in a general nondiabetic population.
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Affiliation(s)
- Jørgen Schei
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; and
| | | | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; and
| | - Trond Geir Jenssen
- Metabolic and Renal Research Group and
- Department of Nephrology, Oslo University Hospital, Oslo, Norway
| | - Marit Dahl Solbu
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; and
| | - Tom Wilsgaard
- Department of Community Medicine, University in Tromsø (UiT) The Arctic University of Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; and
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28
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Methven S, Gasparini A, Carrero JJ, Caskey FJ, Evans M. Routinely measured iohexol glomerular filtration rate versus creatinine-based estimated glomerular filtration rate as predictors of mortality in patients with advanced chronic kidney disease: a Swedish Chronic Kidney Disease Registry cohort study. Nephrol Dial Transplant 2017; 32:ii170-ii179. [DOI: 10.1093/ndt/gfw457] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 12/20/2016] [Indexed: 11/12/2022] Open
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Abstract
Chronic kidney disease (CKD) is currently defined by abnormalities of kidney structure or function assessed using a matrix of variables - including glomerular filtration rate (GFR), thresholds of albuminuria and duration of injury - and is considered by many to be a common disorder globally. However, estimates of CKD prevalence vary widely, both within and between countries. The reasons for these variations are manifold, and include true regional differences in CKD prevalence, vagaries of using estimated GFR (eGFR) for identifying CKD, issues relating to the use of set GFR thresholds to define CKD in elderly populations, and concerns regarding the use of one-off testing for assessment of eGFR or albuminuria to define the prevalence of CKD in large-scale epidemiological studies. Although CKD is common, the suggestion that its prevalence is increasing in many countries might not be correct. Here, we discuss the possible origins of differences in estimates of CKD prevalence, and present possible solutions for tackling the factors responsible for the reported variations in GFR measurements. The strategies we discuss include approaches to improve testing methodologies for more accurate assessment of GFR, to improve awareness of factors that can alter GFR readouts, and to more accurately stage CKD in certain populations, including the elderly.
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30
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Melsom T, Stefansson V, Schei J, Solbu M, Jenssen T, Wilsgaard T, Eriksen BO. Association of Increasing GFR with Change in Albuminuria in the General Population. Clin J Am Soc Nephrol 2016; 11:2186-2194. [PMID: 27683625 PMCID: PMC5142069 DOI: 10.2215/cjn.04940516] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 08/02/2016] [Indexed: 01/13/2023]
Abstract
BACKGROUND AND OBJECTIVES Hyperfiltration at the single-nephron level has been proposed as an early stage of kidney dysfunction of different origins. Evidence supporting this hypothesis in humans is lacking, because there is no method of measuring single-nephron GFR in humans. However, increased whole-kidney GFR in the same individual implies an increased single-nephron GFR, because the number of nephrons does not increase with age. We hypothesized that an increase in GFR would be associated with an increased albumin-to-creatinine ratio in a cohort of the general population. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We measured GFR by iohexol clearance at baseline in 2007-2009 and follow-up after 5.6 years in a representative sample of 1246 persons (aged 50-62 years) who were nondiabetic from the general population of Tromso, northern Norway. Participants were without cardiovascular disease, kidney disease, or diabetes at baseline. We investigated the association between change in GFR and change in albumin-to-creatinine ratio. Increased GFR was defined as a positive change in GFR (change in GFR>0 ml/min) from baseline to follow-up. An albumin-to-creatinine ratio >30 mg/g was classified as albuminuria. RESULTS Change in GFR was positively associated with a change in albumin-to-creatinine ratio in the entire cohort in the multiple linear regression. The albumin-to-creatinine ratiofollow-up-to-albumin-to-creatinine ratiobaseline ratio increased by 8.0% (95% confidence interval, 1.4 to 15.0) per SD increase in change in GFR. When participants with increased GFR (n=343) were compared with those with a reduced GFR (n=903), the ratio increased by 16.3% (95% confidence interval, 1.1 to 33.7). The multivariable adjusted odds ratio for incident albuminuria (n=14) was 4.98 (95% confidence interval, 1.49 to 16.13) for those with an increased GFR (yes/no). CONCLUSIONS Increasing GFR is associated with an increase in albumin-to-creatinine ratio and incident albuminuria in the general nondiabetic population. These findings support single-nephron hyperfiltration as a risk factor for albuminuria in the general population.
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Affiliation(s)
- Toralf Melsom
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromso, Norway; and
| | | | - Jørgen Schei
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromso, Norway; and
| | - Marit Solbu
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromso, Norway; and
| | - Trond Jenssen
- Metabolic and Renal Research Group and
- Section of Nephrology, Department of Organ Transplantation, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Tom Wilsgaard
- Department of Community Medicine, UiT The Arctic University of Norway, Tromso, Norway
| | - Bjørn O. Eriksen
- Metabolic and Renal Research Group and
- Section of Nephrology, University Hospital of North Norway, Tromso, Norway; and
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31
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Stefansson VTN, Schei J, Jenssen TG, Melsom T, Eriksen BO. Central obesity associates with renal hyperfiltration in the non-diabetic general population: a cross-sectional study. BMC Nephrol 2016; 17:172. [PMID: 27832768 PMCID: PMC5103601 DOI: 10.1186/s12882-016-0386-4] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 11/01/2016] [Indexed: 01/22/2023] Open
Abstract
Background Obesity is a risk factor for end-stage renal disease. Renal hyperfiltration, defined as an abnormally high glomerular filtration rate (GFR), is a link in the causal chain between diabetes and chronic kidney disease. Whether obesity is associated with hyperfiltration in the non-diabetic general population, remains unresolved due to a lack of consensus regarding the definition of hyperfiltration and the limited precision of high-range GFR estimations with creatinine and/or cystatin C. Methods 1555 middle-aged participants without diabetes, renal or cardiovascular disease were enrolled from the general population in the Renal Iohexol Clearance Survey from the 6th Tromsø Study (RENIS-T6) between 2007 and 2009. Obesity was assessed using the body mass index (BMI), waist circumference (WC) and the waist-hip ratio (WHR). GFR was measured by iohexol clearance. Dichotomous variables for hyperfiltration were based on two alternative definitions using unadjusted GFR (mL/min) above the 90th percentile. The 90th percentile was age-, sex- and height-specific in one definition and age-, sex-, height- and weight-specific in the other. Results In multivariable adjusted logistic regression models, only WHR was consistently associated with hyperfiltration based on both definitions. For the definition based on the age-, sex-, height- and weight-specific 90th percentile, the association with the WHR (odds ratios (95 % confidence intervals)) for hyperfiltration was 1.48 (1.08–2.02) per 0.10 WHR increase. Conclusions Central obesity is associated with hyperfiltration in the general population. The WHR may serve as a better indicator of the renal effects of obesity than BMI or WC. Electronic supplementary material The online version of this article (doi:10.1186/s12882-016-0386-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Vidar Tor Nyborg Stefansson
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.
| | - Jørgen Schei
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - Trond Geir Jenssen
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.,Department of Organ Transplantation, Oslo University Hospital, Oslo, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.,Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.,Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
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32
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Delanaye P, Melsom T, Ebert N, Bäck SE, Mariat C, Cavalier E, Björk J, Christensson A, Nyman U, Porrini E, Remuzzi G, Ruggenenti P, Schaeffner E, Soveri I, Sterner G, Eriksen BO, Gaspari F. Iohexol plasma clearance for measuring glomerular filtration rate in clinical practice and research: a review. Part 2: Why to measure glomerular filtration rate with iohexol? Clin Kidney J 2016; 9:700-4. [PMID: 27679716 PMCID: PMC5036903 DOI: 10.1093/ckj/sfw071] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 07/11/2016] [Indexed: 12/11/2022] Open
Abstract
A reliable assessment of glomerular filtration rate (GFR) is of paramount importance in clinical practice as well as epidemiological and clinical research settings. It is recommended by Kidney Disease: Improving Global Outcomes guidelines in specific populations (anorectic, cirrhotic, obese, renal and non-renal transplant patients) where estimation equations are unreliable. Measured GFR is the only valuable test to confirm or confute the status of chronic kidney disease (CKD), to evaluate the slope of renal function decay over time, to assess the suitability of living kidney donors and for dosing of potentially toxic medication with a narrow therapeutic index. Abnormally elevated GFR or hyperfiltration in patients with diabetes or obesity can be correctly diagnosed only by measuring GFR. GFR measurement contributes to assessing the true CKD prevalence rate, avoiding discrepancies due to GFR estimation with different equations. Using measured GFR, successfully accomplished in large epidemiological studies, is the only way to study the potential link between decreased renal function and cardiovascular or total mortality, being sure that this association is not due to confounders, i.e. non-GFR determinants of biomarkers. In clinical research, it has been shown that measured GFR (or measured GFR slope) as a secondary endpoint as compared with estimated GFR detected subtle treatment effects and obtained these results with a comparatively smaller sample size than trials choosing estimated GFR. Measuring GFR by iohexol has several advantages: simplicity, low cost, stability and low interlaboratory variation. Iohexol plasma clearance represents the best chance for implementing a standardized GFR measurement protocol applicable worldwide both in clinical practice and in research.
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Affiliation(s)
- Pierre Delanaye
- Department of Nephrology, Dialysis and Transplantation, University of Liège Hospital (ULg CHU), 4000 Liège, Belgium
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT The Arctic University of Norway and Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Natalie Ebert
- Charité University Medicine, Institute of Public Health, Berlin, Germany
| | - Sten-Erik Bäck
- Department of Clinical Chemistry, Skåne University Hospital, Lund, Sweden
| | - Christophe Mariat
- Department of Nephrology, Dialysis, Transplantation and Hypertension, CHU Hôpital Nord, University Jean Monnet, PRES Université de LYON, Saint-Etienne, France
| | - Etienne Cavalier
- Department of Clinical Chemistry, University of Liège Hospital (ULg CHU), Liège, Belgium
| | - Jonas Björk
- Department of Occupational and Environmental Medicine, Lund University, Lund, Sweden
| | | | - Ulf Nyman
- Department of Translational Medicine, Division of Medical Radiology, Skåne University Hospital, Malmö, Sweden
| | - Esteban Porrini
- University of La Laguna, CIBICAN-ITB, Faculty of Medicine, Hospital Universtario de Canarias, Tenerife, Spain
| | - Giuseppe Remuzzi
- Centro di Ricerche Cliniche per le Malattie Rare ‘Aldo e Cele Daccò’, Istituto di Ricerche Farmacologiche Mario Negri, Centro Anna Maria Astori, Science and Technology Park Kilometro Rosso, Bergamo, Italy
- Unit of Nephrology, Azienda Socio Sanitaria Territoriale (ASST) Ospedale Papa Giovanni XXIII, Bergamo, Italy
| | - Piero Ruggenenti
- Centro di Ricerche Cliniche per le Malattie Rare ‘Aldo e Cele Daccò’, Istituto di Ricerche Farmacologiche Mario Negri, Centro Anna Maria Astori, Science and Technology Park Kilometro Rosso, Bergamo, Italy
- Unit of Nephrology, Azienda Socio Sanitaria Territoriale (ASST) Ospedale Papa Giovanni XXIII, Bergamo, Italy
| | - Elke Schaeffner
- Charité University Medicine, Institute of Public Health, Berlin, Germany
| | - Inga Soveri
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Gunnar Sterner
- Department of Nephrology, Skåne University Hospital, Malmö, Sweden
| | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway and Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Flavio Gaspari
- IRCCS - Istituto di Ricerche Farmacologiche ‘Mario Negri', Centro di Ricerche Cliniche per le Malattie Rare ‘Aldo e Cele Daccò', Ranica, Bergamo, Italy
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Keddis MT, Amer H, Voskoboev N, Kremers WK, Rule AD, Lieske JC. Creatinine-Based and Cystatin C-Based GFR Estimating Equations and Their Non-GFR Determinants in Kidney Transplant Recipients. Clin J Am Soc Nephrol 2016; 11:1640-1649. [PMID: 27340283 PMCID: PMC5012488 DOI: 10.2215/cjn.11741115] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 05/02/2016] [Indexed: 01/02/2023]
Abstract
BACKGROUND AND OBJECTIVES eGFR equations have been evaluated in kidney transplant recipients with variable performance. We assessed the performance of the Modification of Diet in Renal Disease equation and the Chronic Kidney Disease Epidemiology Collaboration equations on the basis of creatinine, cystatin C, and both (eGFR creatinine-cystatin C) compared with measured GFR by iothalamate clearance and evaluated their non-GFR determinants and associations across 15 cardiovascular risk factors. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS A cross-sectional cohort of 1139 kidney transplant recipients >1 year after transplant was analyzed. eGFR bias, precision, and accuracy (percentage of estimates within 30% of measured GFR) were assessed. Interaction of each cardiovascular risk factor with eGFR relative to measured GFR was determined. RESULTS Median measured GFR was 55.0 ml/min per 1.73 m(2). eGFR creatinine overestimated measured GFR by 3.1% (percentage of estimates within 30% of measured GFR of 80.4%), and eGFR Modification of Diet in Renal Disease underestimated measured GFR by 2.2% (percentage of estimates within 30% of measured GFR of 80.4%). eGFR cystatin C underestimated measured GFR by -13.7% (percentage of estimates within 30% of measured GFR of 77.1%), and eGFR creatinine-cystatin C underestimated measured GFR by -8.1% (percentage of estimates within 30% of measured GFR of 86.5%). Lower measured GFR associated with older age, women, obesity, longer time after transplant, lower HDL, lower hemoglobin, lower albumin, higher triglycerides, higher proteinuria, and an elevated cardiac troponin T level but did not associate with diabetes, smoking, cardiovascular events, pretransplant dialysis, or hemoglobin A1c. These risk factor associations differed for five risk factors with eGFR creatinine, six risk factors for eGFR Modification of Diet in Renal Disease, ten risk factors for eGFR cystatin C, and four risk factors for eGFR creatinine-cystatin C. CONCLUSIONS Thus, eGFR creatinine and eGFR creatinine-cystatin C are preferred over eGFR cystatin C in kidney transplant recipients because they are less biased, more accurate, and more consistently reflect the same risk factor associations seen with measured GFR.
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Affiliation(s)
- Mira T. Keddis
- Division of Nephrology and Hypertension, Mayo Clinic, Phoenix, Arizona; and
| | | | - Nikolay Voskoboev
- Renal Laboratory, Department of Laboratory Medicine and Pathology, and
| | - Walter K. Kremers
- Department of Health Sciences Research Laboratory, Mayo Clinic, Rochester, Minnesota
| | - Andrew D. Rule
- Division of Nephrology and Hypertension
- Department of Health Sciences Research Laboratory, Mayo Clinic, Rochester, Minnesota
| | - John C. Lieske
- Division of Nephrology and Hypertension
- Renal Laboratory, Department of Laboratory Medicine and Pathology, and
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Delanaye P, Ebert N, Melsom T, Gaspari F, Mariat C, Cavalier E, Björk J, Christensson A, Nyman U, Porrini E, Remuzzi G, Ruggenenti P, Schaeffner E, Soveri I, Sterner G, Eriksen BO, Bäck SE. Iohexol plasma clearance for measuring glomerular filtration rate in clinical practice and research: a review. Part 1: How to measure glomerular filtration rate with iohexol? Clin Kidney J 2016; 9:682-99. [PMID: 27679715 PMCID: PMC5036902 DOI: 10.1093/ckj/sfw070] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 07/08/2016] [Indexed: 01/31/2023] Open
Abstract
While there is general agreement on the necessity to measure glomerular filtration rate (GFR) in many clinical situations, there is less agreement on the best method to achieve this purpose. As the gold standard method for GFR determination, urinary (or renal) clearance of inulin, fades into the background due to inconvenience and high cost, a diversity of filtration markers and protocols compete to replace it. In this review, we suggest that iohexol, a non-ionic contrast agent, is most suited to replace inulin as the marker of choice for GFR determination. Iohexol comes very close to fulfilling all requirements for an ideal GFR marker in terms of low extra-renal excretion, low protein binding and in being neither secreted nor reabsorbed by the kidney. In addition, iohexol is virtually non-toxic and carries a low cost. As iohexol is stable in plasma, administration and sample analysis can be separated in both space and time, allowing access to GFR determination across different settings. An external proficiency programme operated by Equalis AB, Sweden, exists for iohexol, facilitating interlaboratory comparison of results. Plasma clearance measurement is the protocol of choice as it combines a reliable GFR determination with convenience for the patient. Single-sample protocols dominate, but multiple-sample protocols may be more accurate in specific situations. In low GFRs one or more late samples should be included to improve accuracy. In patients with large oedema or ascites, urinary clearance protocols should be employed. In conclusion, plasma clearance of iohexol may well be the best candidate for a common GFR determination method.
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Affiliation(s)
- Pierre Delanaye
- Department of Nephrology, Dialysis and Transplantation , University of Liège Hospital (ULg CHU) , Liège , Belgium
| | - Natalie Ebert
- Charité University Medicine , Institute of Public Health , Berlin , Germany
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Flavio Gaspari
- IRCCS - Istituto di Ricerche Farmacologiche 'Mario Negri', Centro di Ricerche Cliniche per le Malattie Rare 'Aldo e Cele Daccò', Ranica, Bergamo, Italy
| | - Christophe Mariat
- Department of Nephrology, Dialysis, Transplantation and Hypertension , CHU Hôpital Nord, University Jean Monnet, PRES Université de LYON , Saint-Etienne , France
| | - Etienne Cavalier
- Department of Clinical Chemistry , University of Liège Hospital (ULg CHU) , Liège , Belgium
| | - Jonas Björk
- Department of Occupational and Environmental Medicine , Lund University , Lund , Sweden
| | | | - Ulf Nyman
- Department of Translational Medicine, Division of Medical Radiology , Skåne University Hospital , Malmö , Sweden
| | - Esteban Porrini
- University of La Laguna, CIBICAN-ITB, Faculty of Medicine, Hospital Universtario de Canarias, La Laguna, Tenerife , Spain
| | - Giuseppe Remuzzi
- Centro di Ricerche Cliniche per le Malattie Rare 'Aldo e Cele Daccò, Istituto di Ricerche Farmacologiche Mario Negri, Centro Anna Maria Astori, Science and Technology Park Kilometro Rosso, Bergamo, Italy; Unit of Nephrology, Azienda Socio Sanitaria Territoriale (ASST) Ospedale Papa Giovanni XXIII, Bergamo, Italy
| | - Piero Ruggenenti
- Centro di Ricerche Cliniche per le Malattie Rare 'Aldo e Cele Daccò, Istituto di Ricerche Farmacologiche Mario Negri, Centro Anna Maria Astori, Science and Technology Park Kilometro Rosso, Bergamo, Italy; Unit of Nephrology, Azienda Socio Sanitaria Territoriale (ASST) Ospedale Papa Giovanni XXIII, Bergamo, Italy
| | - Elke Schaeffner
- Charité University Medicine , Institute of Public Health , Berlin , Germany
| | - Inga Soveri
- Department of Medical Sciences , Uppsala University , Uppsala , Sweden
| | - Gunnar Sterner
- Department of Nephrology , Skåne University Hospital , Malmö , Sweden
| | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Sten-Erik Bäck
- Department of Clinical Chemistry , Skåne University Hospital , Lund , Sweden
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35
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Melsom T, Schei J, Stefansson VTN, Solbu MD, Jenssen TG, Mathisen UD, Wilsgaard T, Eriksen BO. Prediabetes and Risk of Glomerular Hyperfiltration and Albuminuria in the General Nondiabetic Population: A Prospective Cohort Study. Am J Kidney Dis 2015; 67:841-50. [PMID: 26744126 DOI: 10.1053/j.ajkd.2015.10.025] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 10/20/2015] [Indexed: 11/11/2022]
Abstract
BACKGROUND The role of prediabetes as a risk factor for hyperfiltration and albuminuria in persons who do not develop diabetes is unclear. The lack of evidence is mainly due to the difficulty of accurately assessing the glomerular filtration rate (GFR) in the near-normal range of GFR. We investigated whether prediabetes is an independent risk factor for glomerular hyperfiltration and high-normal urinary albumin-creatinine ratio (ACR) using measured GFR (mGFR) rather than estimated GFR. STUDY DESIGN Prospective cohort study based on the Renal Iohexol Clearance Survey in Tromsø 6 (RENIS-T6) and the RENIS Follow-Up Study. Median observation time was 5.6 years. SETTING & PARTICIPANTS A representative sample of 1,261 persons without diabetes mellitus (DM) from the general population aged 50 to 62 years. PREDICTOR Prediabetes defined by fasting glucose and hemoglobin A1c according to levels suggested by the American Diabetes Association (preDMADA) and the International Expert Committee of 2009 (preDMIEC). OUTCOMES Change in mGFR; hyperfiltration defined as mGFR>90th percentile adjusted for age, sex, weight, and height; and high-normal ACR (>10mg/g) at follow-up. MEASUREMENTS GFR was measured with iohexol clearance. RESULTS Baseline fasting glucose, hemoglobin A1c, and both definitions of prediabetes were predictors of higher mGFR at follow-up and lower annual mGFR decline in multivariable-adjusted regression analyses. Participants with preDMIEC had an OR for hyperfiltration of 1.95 (95% CI, 1.20-3.17) and for high-normal ACR of 1.83 (95% CI, 1.04-3.22) at follow-up. We adjusted for cardiovascular risk factors including ambulatory blood pressure at baseline and change in use of antihypertensive medication between baseline and follow-up. LIMITATIONS Only middle-aged white patients participated. There is no consensus on how to define glomerular hyperfiltration. CONCLUSIONS Our findings imply an independent role of prediabetes in the development of glomerular hyperfiltration and albuminuria. Prediabetes might be a target for early treatment to prevent chronic kidney disease in chronic hyperglycemia.
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Affiliation(s)
- Toralf Melsom
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway.
| | - Jørgen Schei
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway; Department of Clinical Research, University Hospital of North Norway, Tromsø, Norway
| | - Vidar Tor Nyborg Stefansson
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - Marit Dahl Solbu
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Trond Geir Jenssen
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway; Oslo University Hospital, Oslo, Norway
| | - Ulla Dorte Mathisen
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - Tom Wilsgaard
- Department of Community Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; Department of Clinical Research, University Hospital of North Norway, Tromsø, Norway
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Schei J, Stefansson VTN, Mathisen UD, Eriksen BO, Solbu MD, Jenssen TG, Melsom T. Residual Associations of Inflammatory Markers with eGFR after Accounting for Measured GFR in a Community-Based Cohort without CKD. Clin J Am Soc Nephrol 2015; 11:280-6. [PMID: 26668020 DOI: 10.2215/cjn.07360715] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 11/02/2015] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES eGFR on the basis of creatinine (eGFRcre) associates differently with cardiovascular disease and mortality than eGFR on the basis of cystatin C (eGFRcys). This may be related to risk factors affecting the level of creatinine and cystatin C along non-GFR pathways, which may confound the association between eGFR and outcome. Nontraditional risk factors are usually not measured in epidemiologic studies of eGFR and cannot be adjusted for to reduce confounding. We examined whether the inflammatory markers soluble TNF receptor type 2 (sTNFR2), C-reactive protein (CRP), and fibrinogen associated differently with eGFR than with measured GFR (mGFR). DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS GFR was measured by iohexol clearance in 1627 middle-aged participants without kidney disease, diabetes, or cardiovascular disease enrolled in the Renal Iohexol Clearance Survey Study from the Sixth Tromsø Study between 2007 and 2009. Generalized estimating equations were used to assess the residual associations between eGFR (eGFRcre, eGFRcys, and eGFR on the basis of creatinine and cystatin C) and the inflammatory markers relative to mGFR. RESULTS sTNFR2, CRP, and fibrinogen were associated with a higher eGFRcre after accounting for mGFR in multivariable-adjusted models (2.63 ml/min per 1.73 m(2); 95% confidence interval [95% CI], 2.1 to 3.2 per SD increase in sTNFR2, 0.93 ml/min per 1.73 m(2); 95% CI, 0.3 to 1.5 per SD increase in log CRP, and 1.19 ml/min per 1.73 m(2); 95% CI, 0.6 to 1.8 per SD increase in fibrinogen). sTNFR2 and CRP were inversely associated with eGFRcys (-1.4 ml/min per 1.73 m(2); 95% CI, -2.1 to -0.6 per SD increase in sTNFR2, and -0.76 ml/min per 1.73 m(2); 95% CI, -1.4 to -0.1 per SD increase in log CRP). CONCLUSIONS eGFRcre and eGFRcys are associated with inflammatory factors after accounting for mGFR but in opposite directions. These non-GFR-related associations may bias risk estimates by eGFR and, in part, explain the different risks predicted by eGFRcre and eGFRcys in longitudinal studies.
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Affiliation(s)
- Jørgen Schei
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; Department of Clinical Medicine, Metabolic and Renal Research Group, The Artic University of Norway, Tromsø, Norway; and
| | - Vidar T N Stefansson
- Department of Clinical Medicine, Metabolic and Renal Research Group, The Artic University of Norway, Tromsø, Norway; and
| | - Ulla Dorte Mathisen
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; Department of Clinical Medicine, Metabolic and Renal Research Group, The Artic University of Norway, Tromsø, Norway; and
| | - Bjørn O Eriksen
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; Department of Clinical Medicine, Metabolic and Renal Research Group, The Artic University of Norway, Tromsø, Norway; and
| | - Marit D Solbu
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; Department of Clinical Medicine, Metabolic and Renal Research Group, The Artic University of Norway, Tromsø, Norway; and
| | - Trond G Jenssen
- Department of Clinical Medicine, Metabolic and Renal Research Group, The Artic University of Norway, Tromsø, Norway; and Department of Nephrology, Oslo University Hospital, Oslo, Norway
| | - Toralf Melsom
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway; Department of Clinical Medicine, Metabolic and Renal Research Group, The Artic University of Norway, Tromsø, Norway; and
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Eriksen BO, Løchen ML, Arntzen KA, Bertelsen G, Winther Eilertsen BA, von Hanno T, Herder M, Jenssen TG, Mathisen UD, Melsom T, Njølstad I, Solbu MD, Mathiesen EB. Estimated and Measured GFR Associate Differently with Retinal Vasculopathy in the General Population. Nephron Clin Pract 2015; 131:175-84. [PMID: 26426198 DOI: 10.1159/000441092] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 09/11/2015] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND/AIMS Estimated glomerular filtration rate (eGFR) is used extensively in epidemiological research. Validations of eGFR have demonstrated acceptable performance, but the dependence of creatinine and cystatin C on non-GFR factors could confound associations with disease. Few studies have investigated this issue in direct comparison with measured GFR (mGFR). We compared the associations between eGFR and mGFR and retinal vasculopathy, a marker of systemic microvasculopathy. METHODS Iohexol clearance and retinal photography were examined in the Renal Iohexol Clearance Survey in Tromsø 6, which consists of a representative sample of middle-aged persons from the general population. A total of 1,553 persons without self-reported kidney disease, cardiovascular disease or diabetes were investigated. Three eGFR equations based on creatinine and/or cystatin C from the Chronic Kidney Disease Epidemiology Collaboration were studied. Differences between eGFR and mGFR were analyzed with seemingly unrelated regression methods. RESULTS mGFR in the lowest quartile was associated with an increased multivariable-adjusted odds ratio of retinopathy (OR 1.86, 95% CI 1.16-2.97), but not with retinal artery or vein diameters. eGFR based on cystatin C (eGFRcys) was consistently biased relative to mGFR in its associations with retinal vessel diameters across different models. eGFR based on creatinine (eGFRcrea) and eGFR based on both creatinine and cystatin C were also biased in several of these models (p < 0.05). For retinopathy, the differences between the 3 eGFR and mGFR measurements were not statistically significant. CONCLUSIONS Low mGFR is associated with retinopathy in the general population. eGFR based on creatinine and/or cystatin C are not valid substitutes for mGFR in studies of the relationship between the retina and kidney function in healthy persons.
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Affiliation(s)
- Bjørn Odvar Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsx00F8;, Norway
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Hu W, Hao H, Yu W, Wu X, Zhou H. Association of elevated glycosylated hemoglobin A1c with hyperfiltration in a middle-aged and elderly Chinese population with prediabetes or newly diagnosed diabetes: a cross-sectional study. BMC Endocr Disord 2015; 15:47. [PMID: 26363801 PMCID: PMC4568072 DOI: 10.1186/s12902-015-0043-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 09/04/2015] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND To examine whether elevated glycosylated hemoglobin A1c (HbA1c) is associated with hyperfiltration in a middle-aged and elderly Chinese population. METHODS Anthropometric and biochemical examinations were performed in 2491 individuals from the general population, aged 40-79 years, who participated in the Huaian Diabetes Prevention Program. The estimated glomerular filtration rate (eGFR) was calculated from creatinine levels using the CKD-EPI formula. Hyperfiltration was defined as eGFR >90(th) percentile. RESULTS After adjustment [for age, gender, waistline, body mass index, blood pressure, smoking, alcohol consumption, cholesterol, log(triglycerides), high-density lipoprotein, low-density lipoprotein, serum uric acid, sodium intake, hypertension, and use of angiotensin converting enzyme inhibitors or angiotensin receptor blockers], HbA1c and fasting plasma glucose (FPG) were found to be independently positively associated with eGFR. Additionally, after multivariate adjustment, the odds ratios (95 % CI) for hyperfiltration calculated for a 1-unit increase in HbA1c and FPG were 1.396 (1.089-1.790) and 1.306 (1.117-1.526), respectively. Compared with participants with HbA1c levels <5.7%, the odds ratios (95 % CI) for hyperfiltration were 2.344 (1.025-5.364) in participants with HbA1c levels of 6.21-6.49%, and 2.965 (1.537-5.720) in those with HbA1c levels ≥ 6.5%. CONCLUSION Elevated HbA1c (≥ 6.21%) is associated with an increased odds of hyperfiltration in middle-aged and elderly Chinese. Longitudinal studies are needed to explore whether hyperfiltration increases the odds of diabetic nephropathy in individuals with prediabetes.
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Affiliation(s)
- Wen Hu
- Department of Endocrinology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, , Jiangsu Province, China
- Department of Endocrinology and Metabolism, Huai'an Hospital Affiliated to Xuzhou Medical College and Huai'an Second People's Hospital, Huai'an, 223002, China
| | - Hairong Hao
- Department of Endocrinology and Metabolism, Huai'an Hospital Affiliated to Xuzhou Medical College and Huai'an Second People's Hospital, Huai'an, 223002, China
| | - Weinan Yu
- Department of Endocrinology and Metabolism, Huai'an Hospital Affiliated to Xuzhou Medical College and Huai'an Second People's Hospital, Huai'an, 223002, China
| | - Xiaojuan Wu
- Department of Endocrinology and Metabolism, Huai'an Hospital Affiliated to Xuzhou Medical College and Huai'an Second People's Hospital, Huai'an, 223002, China
| | - Hongwen Zhou
- Department of Endocrinology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, , Jiangsu Province, China.
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