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      Changes of Serum Calcium, Magnesium and Parathyroid Hormone Induced by Hemodialysis with Citrate-Enriched Dialysis Solution

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          Abstract

          Background/Aims: In recent years, one of technical attempts to improve biocompatibility and tolerability of the hemodialysis procedure is the substitution of acetate in dialysis solution with citrate. The aim of our study was to compare two dialysis solutions: traditional bicarbonate dialysis solution containing acetate (3 mmol/L) (solution A); and (solution C) commercially produced citrate-enriched bicarbonate dialysis solution (0.8 mmol/L citrate). Methods: Patients from a single hemodialysis center (N=126) were included in the study. Both conventional low-flux hemodialysis and on-line hemodiafiltration procedures were studied. Both dialysis solutions contained identical calcium (1.5 mmol/L) and magnesium (0.5 mmol/L) concentrations. Results: Parathyroid hormone (iPTH) concentration decreased during procedures with solution A by 64%. On the contrary, when solution C was used, iPTH concentration increased insignificantly by 4%. For solution A, serum calcium and magnesium increased during procedures in patients with predialysis concentrations lower than 2.33 and 0.76 mmol/L, respectively. In procedures with dialysis solution C these concentrations were significantly lower: 2.19 mmol/L for Ca and 0.68 mmol/L for Mg. Conclusion: Our study clearly shows that the substitution of part of acetate with citrate in dialysis solution significantly influences changes of serum calcium, magnesium and parathyroid hormone concentrations during hemodialysis and hemodiafiltration procedures.

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          Modifiable risk factors associated with sudden cardiac arrest within hemodialysis clinics.

           Claire F. Honeycutt,  C Herzog,  R. Middleton … (2010)
          Sudden cardiac arrest is the most common cause of death among patients with end-stage kidney disease (ESKD) maintained on hemodialysis. Here we sought to identify dialysis-related factors associated with this increased risk in a case-control study encompassing 43,200 patients dialyzed in outpatient clinics of a large organization. Within this group, we compared the clinical and dialysis-specific data of 502 patients who experienced a sudden cardiac arrest with 1632 age- and dialysis-vintage-matched controls. There were 4.5 sudden cardiac arrest events per 100,000 dialysis treatments during the 3-year study period. These patients were significantly more likely to have been exposed to low potassium dialysate of less than 2 meq/l. These differences could not be explained by predialysis serum potassium levels. There was no evidence for a beneficial effect of low potassium dialysate even among those with higher predialysis serum potassium levels. Other factors strongly associated with sudden cardiac arrest by multivariable analysis included increased ultrafiltration volumes, exposure to low calcium dialysate, and predialysis serum creatinine levels. These relationships persisted after adjustment for covariates, but traditional risk factors such as history of coronary heart disease and congestive heart failure were not significantly influential. Hence, our study suggests that modifications of the hemodialysis prescription may improve the risk of sudden cardiac arrest in patients with ESKD.
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            Citrate anticoagulation abolishes degranulation of polymorphonuclear cells and platelets and reduces oxidative stress during haemodialysis.

             Menso Nubé,  Tom Teerlink,  Marianne Schoorl … (2005)
            During haemodialysis (HD), polymorphonuclear cells (PMNs) and platelets are activated and release various granule products, including myeloperoxidase (MPO) and platelet factor 4 (PF4). MPO triggers the generation of reactive oxygen species, leading to irreversible protein, carbohydrate and lipid modification. PF4 probably also contributes to oxidative stress. As previously shown, HD-induced PMN degranulation is almost completely abolished during citrate anticoagulation, most probably due to its calcium chelation ability. In the present study, apart from HD-induced PMN and platelet degranulation, oxidative stress was analysed during three modes of anticoagulation. Heparin, dalteparin and citrate (HDhep, HDdal and HDcit) were compared in a randomized, crossover fashion in eight chronic HD patients. Multiple blood samples were taken during the third HD session of each modality, from both the afferent and efferent line. Besides the degranulation markers MPO and PF4, various markers of oxidative stress were measured, including oxidized low-density lipoprotein (ox-LDL), malondialdehyde (MDA) and carboxymethyllysine (CML). During HDhep and HDdal, marked degranulation was observed shortly after the start of HD. In contrast, during HDcit, PF4 and MPO levels remained unaltered, suggesting no release at all. After 1 week of HDcit, ox-LDL levels were markedly reduced [median 26% (3-65%), P=0.01], if compared with HDhep and HDdal. As regards MDA and CML, no differences were found. This study shows first, that HD-induced PMN and platelet degranulation are early, most probably calcium-dependent processes and, secondly, that the formation of ox-LDL is clearly dependent on the type of anticoagulant applied.
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              Dialysate calcium concentration and the risk of sudden cardiac arrest in hemodialysis patients.

               Patrick Pun,  John R. Horton,  John P Middleton (2013)
              The optimal dialysate calcium concentration to maintain normal mineralization and reduce risk of cardiovascular events in hemodialysis patients is debated. Guidelines suggest that dialysate Ca concentration should be lowered to avoid vascular calcification, but cardiac arrhythmias may be more likely to occur at lower dialysate Ca. Concurrent use of QT-prolonging medications may also exacerbate arrhythmic risk. This study examined the influence of serum Ca, dialysate Ca, and QT interval-prolonging medications on the risk of sudden cardiac arrest in a cohort of hemodialysis patients.
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                Author and article information

                Journal
                Journal ID (publisher-id): KBR
                Journal ID (nlm-ta): Kidney Blood Press Res
                Journal ID (doi): 10.1159/issn.1420-4096
                Title: Kidney and Blood Pressure Research
                Publisher: S. Karger AG
                ISSN (Print): 1420-4096
                ISSN (Electronic): 1423-0143
                Publication date Subscription-year: 2015
                Publication date (Print): March 2015
                Publication date (Electronic): 31 January 2015
                Volume: 40
                Issue: 1
                Pages: 13-21
                Affiliations
                aHemodialysis Center, University Hospital; bDepartment of Internal Medicine III; cInstitute of Clinical Biochemistry and Diagnostics; dDepartment of Internal Medicine II, Charles University, Faculty of Medicine and University Hospital, Hradec Kralove, Czech Republic
                Author notes
                *Roman Safranek, MD, Ph.D., Hemodialysis Center, University Hospital Hradec Kralove, Sokolska 581,, 500 05 Hradec Kralove (Czech Republic), Tel. +420 495832219, Fax +420 495832031, E-Mail roman.safranek@fnhk.cz
                Article
                Publisher ID: 368478 Other ID: Kidney Blood Press Res 2015;40:13-21
                DOI: 10.1159/000368478
                PubMed ID: 25661822
                Copyright statement: © 2015 S. Karger AG, Basel
                License:

                Open Access License: This is an Open Access article licensed under the terms of the Creative Commons Attribution-NonCommercial 3.0 Unported license (CC BY-NC) ( http://www.karger.com/OA-license), applicable to the online version of the article only. Distribution permitted for non-commercial purposes only. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                Page count
                Figures: 1, Tables: 3, References: 26, Pages: 9
                Product
                Self URI (application/pdf): https://www.karger.com/Article/Pdf/368478
                Categories
                Subject: Original Paper

                Data availability:

                ScienceOpen disciplines: Cardiovascular Medicine, Nephrology

                Keywords: Parathyroid hormone, Calcium, Magnesium, Hemodiafiltration, Citrate, Hemodialysis, Dialysis solution, Acetate

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