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      Cardiovascular Biomarkers in Chronic Kidney Disease: State of Current Research and Clinical Applicability

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      Author(s): 1 , 2 , 3 , 4 , 5 , *
      Publication date (Electronic):
      Journal: Disease Markers
      Publisher: Hindawi Publishing Corporation

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          Abstract

          The high incidence of cardiovascular events in chronic kidney disease (CKD) warrants an accurate evaluation of risk aimed at reducing the burden of disease and its consequences. The use of biomarkers to identify patients at high risk has been in use in the general population for several decades and has received mixed reactions in the medical community. Some practitioners have become staunch supporters and users while others doubt the utility of biomarkers and rarely measure them. In CKD patients numerous markers similar to those used in the general population and others more specific to the uremic population have emerged; however their utility for routine clinical application remains to be fully elucidated. The reproducibility and standardization of the serum assays are serious limitations to the broad implementation of these tests. The lack of focused research and validation in randomized trials rather than ad hoc measurement of multiple serum markers in observational studies is also cause for concern related to the clinical applicability of these markers. We review the current literature on biomarkers that may have a relevant role in field of nephrology.

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          Plasma concentrations of a novel, adipose-specific protein, adiponectin, in type 2 diabetic patients.

          Kikuko Hotta, Tohru Funahashi, Yukio Arita … (2000)
          Adiponectin is a novel, adipose-specific protein abundantly present in the circulation, and it has antiatherogenic properties. We analyzed the plasma adiponectin concentrations in age- and body mass index (BMI)-matched nondiabetic and type 2 diabetic subjects with and without coronary artery disease (CAD). Plasma levels of adiponectin in the diabetic subjects without CAD were lower than those in nondiabetic subjects (6.6+/-0.4 versus 7.9+/-0.5 microg/mL in men, 7.6+/-0.7 versus 11.7+/-1.0 microg/mL in women; P<0.001). The plasma adiponectin concentrations of diabetic patients with CAD were lower than those of diabetic patients without CAD (4.0+/-0.4 versus 6.6+/-0.4 microg/mL, P<0.001 in men; 6.3+/-0.8 versus 7.6+/-0. 7 microg/mL in women). In contrast, plasma levels of leptin did not differ between diabetic patients with and without CAD. The presence of microangiopathy did not affect the plasma adiponectin levels in diabetic patients. Significant, univariate, inverse correlations were observed between adiponectin levels and fasting plasma insulin (r=-0.18, P<0.01) and glucose (r=-0.26, P<0.001) levels. In multivariate analysis, plasma insulin did not independently affect the plasma adiponectin levels. BMI, serum triglyceride concentration, and the presence of diabetes or CAD remained significantly related to plasma adiponectin concentrations. Weight reduction significantly elevated plasma adiponectin levels in the diabetic subjects as well as the nondiabetic subjects. These results suggest that the decreased plasma adiponectin concentrations in diabetes may be an indicator of macroangiopathy.
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            Rapid measurement of B-type natriuretic peptide in the emergency diagnosis of heart failure.

            Alan Maisel, Padma Krishnaswamy, Richard M. Nowak … (2002)
            B-type natriuretic peptide is released from the cardiac ventricles in response to increased wall tension. We conducted a prospective study of 1586 patients who came to the emergency department with acute dyspnea and whose B-type natriuretic peptide was measured with a bedside assay. The clinical diagnosis of congestive heart failure was adjudicated by two independent cardiologists, who were blinded to the results of the B-type natriuretic peptide assay. The final diagnosis was dyspnea due to congestive heart failure in 744 patients (47 percent), dyspnea due to noncardiac causes in 72 patients with a history of left ventricular dysfunction (5 percent), and no finding of congestive heart failure in 770 patients (49 percent). B-type natriuretic peptide levels by themselves were more accurate than any historical or physical findings or laboratory values in identifying congestive heart failure as the cause of dyspnea. The diagnostic accuracy of B-type natriuretic peptide at a cutoff of 100 pg per milliliter was 83.4 percent. The negative predictive value of B-type natriuretic peptide at levels of less than 50 pg per milliliter was 96 percent. In multiple logistic-regression analysis, measurements of B-type natriuretic peptide added significant independent predictive power to other clinical variables in models predicting which patients had congestive heart failure. Used in conjunction with other clinical information, rapid measurement of B-type natriuretic peptide is useful in establishing or excluding the diagnosis of congestive heart failure in patients with acute dyspnea. Copyright 2002 Massachusetts Medical Society.
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              Fibroblast growth factor 23 is elevated before parathyroid hormone and phosphate in chronic kidney disease.

              Tamara Isakova, Patricia Wahl, Gabriela S. Vargas … (2011)
              Fibroblast growth factor 23 (FGF23) regulates phosphorus metabolism and is a strong predictor of mortality in dialysis patients. FGF23 is thought to be an early biomarker of disordered phosphorus metabolism in the initial stages of chronic kidney disease (CKD). We measured FGF23 in baseline samples from 3879 patients in the Chronic Renal Insufficiency Cohort study, which is a diverse cohort of patients with CKD stage 2-4. Mean serum phosphate and median parathyroid hormone (PTH) levels were in the normal range, but median FGF23 was markedly greater than in healthy populations, and increased significantly with decreasing estimated glomerular filtration rate (eGFR). High levels of FGF23, defined as being above 100 RU/ml, were more common than secondary hyperparathyroidism and hyperphosphatemia in all strata of eGFR. The threshold of eGFR at which the slope of FGF23 increased was significantly higher than the corresponding threshold for PTH based on non-overlapping 95% confidence intervals. Thus, increased FGF23 is a common manifestation of CKD that develops earlier than increased phosphate or PTH. Hence, FGF23 measurements may be a sensitive early biomarker of disordered phosphorus metabolism in patients with CKD and normal serum phosphate levels.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Dis Markers
                Journal ID (iso-abbrev): Dis. Markers
                Journal ID (publisher-id): DM
                Title: Disease Markers
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 0278-0240
                ISSN (Electronic): 1875-8630
                Publication date (Print): 2015
                Publication date (Electronic): 5 April 2015
                Volume: 2015
                Electronic Location Identifier: 586569
                Affiliations
                1Unidad Avanzada de Investigación y Diagnostico Ecográfico y Renal, Clínica Puerto Ordaz, Puerto Ordaz, Venezuela
                2U.O.C. di Nefrologia e Dialisi, Ospedale Sant'Anna, Azienda Ospedaliera Sant'Anna, Como, Italy
                3Department of Health Sciences, University of Milan, Milan, Italy
                4Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, AB, Canada
                5Department of Radiology, Emory University, Atlanta, GA, USA
                Author notes

                Academic Editor: Shih-Ping Hsu

                Article
                DOI: 10.1155/2015/586569
                PMC ID: 4402164
                SO-VID: a3ca2c0a-c428-483b-9ac3-19b37b211a78
                Copyright © Copyright © 2015 Luis D'Marco et al.
                License:

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 15 December 2014
                Date revision received : 15 March 2015
                Date accepted : 18 March 2015
                Categories
                Subject: Research Article

                Data availability:

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