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Eriksen BO, Fasiolo M, Mathisen UD, Jenssen TG, Stefansson VTN, Melsom T. Ambulatory blood pressure as risk factor for long-term kidney function decline in the general population: a distributional regression approach. Sci Rep 2023; 13:14296. [PMID: 37652955 PMCID: PMC10471748 DOI: 10.1038/s41598-023-41181-7] [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: 02/06/2023] [Accepted: 08/23/2023] [Indexed: 09/02/2023] Open
Abstract
The results of randomized controlled trials are unclear about the long-term effect of blood pressure (BP) on kidney function assessed as the glomerular filtration rate (GFR) in persons without chronic kidney disease or diabetes. The limited duration of follow-up and use of imprecise methods for assessing BP and GFR are important reasons why this issue has not been settled. Since a long-term randomized trial is unlikely, we investigated the association between 24-h ambulatory BP (ABP) and measured GFR in a cohort study with a median follow-up of 11 years. The Renal Iohexol Clearance Survey (RENIS) cohort is a representative sample of persons aged 50 to 62 years without baseline cardiovascular disease, diabetes, or kidney disease from the general population of Tromsø in northern Norway. ABP was measured at baseline, and iohexol clearance at baseline and twice during follow-up. The study population comprised 1589 persons with 4127 GFR measurements. Baseline ABP or office BP components were not associated with the GFR change rate in multivariable adjusted conventional regression models. In generalized additive models for location, scale, and shape (GAMLSS), higher daytime systolic, diastolic, and mean arterial ABP were associated with a slight shift of the central part of the GFR distribution toward lower GFR and with higher probability of GFR < 60 mL/min/1.73 m2 during follow-up (p < 0.05). The use of a distributional regression method and precise methods for measuring exposure and outcome were necessary to detect an unfavorable association between BP and GFR in this study of the general population.
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Affiliation(s)
- 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.
| | - Matteo Fasiolo
- School of Mathematics, University of Bristol, Bristol, UK
| | - Ulla D Mathisen
- 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
| | - Trond G Jenssen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Department of Transplant Medicine, Oslo University Hospital and University of Oslo, Oslo, 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
| | - 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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2
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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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3
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Alan G, Guenancia C, Arnould L, Azemar A, Pitois S, Maza M, Bichat F, Zeller M, Gabrielle PH, Bron AM, Creuzot-Garcher C, Cottin Y. Retinal Vascular Density as A Novel Biomarker of Acute Renal Injury after Acute Coronary Syndrome. Sci Rep 2019; 9:8060. [PMID: 31147610 PMCID: PMC6543041 DOI: 10.1038/s41598-019-44647-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 05/21/2019] [Indexed: 11/09/2022] Open
Abstract
Iodinated contrast agent (ICA)-induced acute kidney injury (AKI) following acute coronary syndrome (ACS) is a frequent complication, which may lead to chronic kidney disease and increased mortality. Optical coherence tomography angiography (OCT-A) of the retina is new tool delivering a rapid and noninvasive assessment of systemic microvascularization, which is potentially involved in the occurrence of ICA-induced AKI. Between October 2016 and March 2017, 452 ACS patients were admitted to our cardiac intensive care unit. OCT-A was performed within 48 h after the ICA injection. Patients with a history of retinal disease were excluded. The patients included were divided into two groups depending on whether or not AKI occurred after injection of ICA, according to KDIGO criteria. Of the 216 patients included, 21 (10%) presented AKI. AKI was significantly associated with age, Mehran score, GRACE score, and NT-proBNP. AKI patients had significantly lower retinal vascular density (RVD)) and had more frequent low RVD (81% vs 45%, P = 0.002). Adding low RVD to the Mehran score and the NT-proBNP, or to the GRACE score and the NT-proBNP, significantly improved their predictive values, suggesting that systemic microvascular involvement remains incompletely addressed by either standard risk scores or factors known to be associated with ICA-induced AKI.
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Affiliation(s)
- Guillaume Alan
- Cardiology Department, University Hospital, Dijon, France
| | - Charles Guenancia
- Cardiology Department, University Hospital, Dijon, France. .,PEC 2, Univ. Bourgogne Franche-Comté, Dijon, France.
| | - Louis Arnould
- Ophthalmology Department, University Hospital, Dijon, France.,INSERM, CIC1432, clinical epidemiology unit, Dijon, France.,Dijon University Hospital, Clinical investigation Center, Clinical epidemiology/clinical trials unit, Dijon, France.,Eye and Nutrition Research group, CSGA, UMR 1324 INRA, Dijon, France
| | - Arthur Azemar
- Cardiology Department, University Hospital, Dijon, France
| | | | - Maud Maza
- PEC 2, Univ. Bourgogne Franche-Comté, Dijon, France
| | | | | | - Pierre-Henri Gabrielle
- Ophthalmology Department, University Hospital, Dijon, France.,Eye and Nutrition Research group, CSGA, UMR 1324 INRA, Dijon, France
| | - Alain Marie Bron
- Ophthalmology Department, University Hospital, Dijon, France.,Eye and Nutrition Research group, CSGA, UMR 1324 INRA, Dijon, France
| | - Catherine Creuzot-Garcher
- Ophthalmology Department, University Hospital, Dijon, France.,Eye and Nutrition Research group, CSGA, UMR 1324 INRA, Dijon, France
| | - Yves Cottin
- Cardiology Department, University Hospital, Dijon, France.,PEC 2, Univ. Bourgogne Franche-Comté, Dijon, France
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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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5
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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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6
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Eriksen BO, Stefansson VTN, Jenssen TG, Mathisen UD, Schei J, Solbu MD, Wilsgaard T, Melsom T. Blood pressure and age-related GFR decline in the general population. BMC Nephrol 2017; 18:77. [PMID: 28245797 PMCID: PMC5331738 DOI: 10.1186/s12882-017-0496-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 02/24/2017] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Hypertension is one of the most important causes of end-stage renal disease, but it is unclear whether elevated blood pressure (BP) also accelerates the gradual decline in the glomerular filtration rate (GFR) seen in the general population with increasing age. The reason may be that most studies have considered only baseline BP and not the effects of changes in BP, antihypertensive treatment and other determinants of GFR during follow-up. Additionally, the use of GFR estimated from creatinine or cystatin C instead of measurements of GFR may have biased the results because of influence from non-GFR related confounders. We studied the relationship between BP and GFR decline using time-varying variables in a cohort representative of the general population using measurements of GFR as iohexol clearance. METHODS We included 1594 subjects aged 50 to 62 years without baseline diabetes, kidney-, or cardiovascular disease in the Renal Iohexol-clearance Survey in Tromsø 6 (RENIS-T6). GFR, BP, antihypertensive medication and all adjustment variables were ascertained at baseline, and at follow-up after a median observation time of 5.6 years in 1299 persons (81%). The relationship between GFR decline and BP was analyzed in linear mixed models. RESULTS The mean (standard deviation) GFR decline rate was 0.95 (2.23) mL/min/year. The percentage of persons with hypertension (systolic BP ≥ 140 mmHg, diastolic BP ≥ 90 mmHg or antihypertensive medication) increased from 42 to 52% between baseline and follow-up. In multivariable adjusted linear mixed models using time-varying independent variables measured at baseline and follow-up, higher systolic and diastolic BP were associated with slower GFR decline rates by 0.10 and 0.20 mL/min/year/10 mmHg, respectively (p < 0.05). The association was stronger in persons on antihypertensive medication than in others (p < 0.05 for the interaction between BP and antihypertensive medication). CONCLUSIONS In the medium-term, elevated BP is not associated with accelerated GFR decline in the general middle-aged population. In persons using antihypertensive medication, elevated BP is associated with a paradoxical slower GFR decline. Studies with even longer observation periods are needed to evaluate the ultimate effect of BP on kidney function.
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Affiliation(s)
- Bjørn O. Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, University Hospital of North Norway, Tromsø, 9038 Norway
| | | | - Trond G. Jenssen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Department of Transplant Medicine, Oslo University Hospital, Rikshospitalet, Norway
| | - Ulla D. Mathisen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, University Hospital of North Norway, Tromsø, 9038 Norway
| | - Jørgen Schei
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
| | - Marit D. Solbu
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, University Hospital of North Norway, Tromsø, 9038 Norway
| | - Tom Wilsgaard
- Department of Community Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, University Hospital of North Norway, Tromsø, 9038 Norway
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7
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Eriksen BO, Stefansson VTN, Jenssen TG, Mathisen UD, Schei J, Solbu MD, Wilsgaard T, Melsom T. High Ambulatory Arterial Stiffness Index Is an Independent Risk Factor for Rapid Age-Related Glomerular Filtration Rate Decline in the General Middle-Aged Population. Hypertension 2017; 69:651-659. [PMID: 28223468 DOI: 10.1161/hypertensionaha.117.09020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Revised: 01/15/2017] [Accepted: 01/27/2017] [Indexed: 11/16/2022]
Abstract
Arterial stiffness is a risk factor for cardiovascular and chronic kidney disease. However, the role of arterial stiffness as a predictor of the age-related glomerular filtration rate (GFR) decline in the general population remains unresolved because of difficulty in measuring GFR with sufficient precision in epidemiological studies. The ambulatory arterial stiffness index (AASI) is a proposed indicator of arterial stiffness easily calculated from ambulatory blood pressure. We investigated whether AASI could predict GFR decline measured as iohexol clearance in the general population. We calculated AASI from baseline ambulatory blood pressure and measured the iohexol clearance at baseline and follow-up in the RENIS-FU study (Renal Iohexol Clearance Survey Follow-Up). AASI was defined as 1 minus the regression slope of the diastolic blood pressure measurement over the systolic blood pressure measurement for each patient. The RENIS cohort included a representative sample of the general middle-aged population without baseline diabetes mellitus, cardiovascular disease, or kidney disease (n=1608). The participant age was 50 to 62 years old at baseline, and the median observation time was 5.6 years. The mean (SD) of the GFR decline rate was 0.95 mL/min per year (2.23) and that of the AASI was 0.38 mL/min per year (0.13). Baseline ambulatory blood pressure or the night/day systolic or diastolic ambulatory blood pressure ratios were not associated with GFR decline. In multivariable-adjusted linear mixed regression analysis, 1 SD of increase in the baseline AASI was associated with a 0.14 mL/min per year (95% confidence interval, -0.26 to -0.02) steeper GFR decline. We conclude that the AASI is an independent risk factor for accelerated age-related GFR decline in the general middle-aged population.
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Affiliation(s)
- Bjørn Odvar Eriksen
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.).
| | - Vidar Tor Nyborg Stefansson
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.)
| | - Trond Geir Jenssen
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.)
| | - Ulla Dorte Mathisen
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.)
| | - Jørgen Schei
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.)
| | - Marit Dahl Solbu
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.)
| | - Tom Wilsgaard
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.)
| | - Toralf Melsom
- From the Metabolic and Renal Research Group (B.O.E., V.T.N.S., T.G.J., U.D.M., J.S., M.D.S., T.M.), Department of Community Medicine, Faculty of Health Sciences (T.W.), UiT The Arctic University of Norway; Section of Nephrology, University Hospital of North Norway (B.O.E., U.D.M., M.D.S., T.M.); and Department of Transplant Medicine, Oslo University Hospital, Norway (T.G.J.)
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8
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Heitmar R, Varma C, De P, Lau YC, Blann AD. The relationship of systemic markers of renal function and vascular function with retinal blood vessel responses. Graefes Arch Clin Exp Ophthalmol 2016; 254:2257-2265. [PMID: 27436082 PMCID: PMC5080305 DOI: 10.1007/s00417-016-3432-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 06/09/2016] [Accepted: 06/27/2016] [Indexed: 01/18/2023] Open
Abstract
PURPOSE To test the hypothesis of a significant relationship between systemic markers of renal and vascular function (processes linked to cardiovascular disease and its development) and retinal microvascular function in diabetes and/or cardiovascular disease. METHODS Ocular microcirculatory function was measured in 116 patients with diabetes and/or cardiovascular disease using static and continuous retinal vessel responses to three cycles of flickering light. Endothelial function was evaluated by von Willebrand factor (vWf), endothelial microparticles and soluble E selectin, renal function by serum creatinine, creatinine clearance and estimated glomerular filtration rate (eGFR). HbA1c was used as a control index. RESULTS Central retinal vein equivalence and venous maximum dilation to flicker were linked to HbA1c (both p < 0.05). Arterial reaction time was linked to serum creatinine (p = 0.036) and eGFR (p = 0.039); venous reaction time was linked to creatinine clearance (p = 0.018). Creatinine clearance and eGFR were linked to arterial maximum dilatation (p < 0.001 and p = 0.003, respectively) and the dilatation amplitude (p = 0.038 and p = 0.048, respectively) responses in the third flicker cycle. Of venous responses to the first flicker cycle, HbA1c was linked to the maximum dilation response (p = 0.004) and dilatation amplitude (p = 0.017), vWf was linked to the maximum constriction response (p = 0.016), and creatinine clearance to the baseline diameter fluctuation (p = 0.029). In the second flicker cycle, dilatation amplitude was linked to serum creatinine (p = 0.022). CONCLUSIONS Several retinal blood vessel responses to flickering light are linked to glycaemia and renal function, but only one index is linked to endothelial function. Renal function must be considered when interpreting retinal vessel responses.
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Affiliation(s)
- R Heitmar
- Aston University, School of Life and Health Sciences, Aston Triangle, B4 7ET, Birmingham, UK
| | - C Varma
- Department of Cardiology, City Hospital, Birmingham, B18 7QH, UK
| | - P De
- Department of Diabetes and Endocrinology, City Hospital, Birmingham, B18 7QH, UK
| | - Y C Lau
- University of Birmingham Institute for Cardiovascular Sciences, City Hospital, Birmingham, B18 7QH, UK
| | - A D Blann
- University of Birmingham Institute for Cardiovascular Sciences, City Hospital, Birmingham, B18 7QH, UK.
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Eriksen BO, Stefansson VTN, Jenssen TG, Mathisen UD, Schei J, Solbu MD, Wilsgaard T, Melsom T. Elevated blood pressure is not associated with accelerated glomerular filtration rate decline in the general non-diabetic middle-aged population. Kidney Int 2016; 90:404-410. [PMID: 27188503 DOI: 10.1016/j.kint.2016.03.021] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 03/07/2016] [Accepted: 03/10/2016] [Indexed: 12/14/2022]
Abstract
Although hypertension is a risk factor for end-stage renal disease, this complication develops in only a minority of hypertensive patients. Whether non-malignant hypertension itself is sufficient to cause reduced glomerular filtration rate (GFR) is unclear. Therefore, we investigated whether elevated blood pressure (BP) was associated with accelerated GFR decline in the general population. The study was based on the Renal Iohexol Clearance Survey in Tromsø 6 (RENIS-T6), which included a representative sample of 1594 individuals aged 50 to 62 years from the general population without baseline diabetes or kidney or cardiovascular disease. GFR was measured as iohexol clearance at baseline and follow-up after a median observation time of 5.6 years. BP was measured according to a standardized procedure. The mean (SD) GFR decline rate was 0.95 (2.23) ml/min/yr. In multivariable adjusted linear mixed regressions with either baseline systolic or diastolic BP as the independent variable, there were no statistically significant associations with GFR decline. Thus, elevated BP is not associated with accelerated mean GFR decline in the general middle-aged population. Hence, additional genetic and environmental factors are probably necessary for elevated BP to develop manifest chronic kidney disease in some individuals.
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Affiliation(s)
- Bjørn O Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway.
| | - Vidar T N Stefansson
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
| | - Trond G Jenssen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway; Oslo University Hospital, Oslo, Norway
| | - Ulla D Mathisen
- Metabolic and Renal Research Group, 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, UiT The Arctic University of Norway, Tromsø, Norway
| | - Marit D Solbu
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway; Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Tom Wilsgaard
- Department of Community Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - 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
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