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Karabelas AJ. On the total albumin losses during haemocatharsis. J Artif Organs 2024; 27:91-99. [PMID: 38238597 PMCID: PMC11126488 DOI: 10.1007/s10047-023-01430-y] [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: 08/28/2023] [Accepted: 12/16/2023] [Indexed: 05/26/2024]
Abstract
Excessive albumin losses during HC (haemocatharsis) are considered a potential cause of hypoalbuminemia-a key risk factor for mortality. This review on total albumin losses considers albumin "leaking" into the dialysate and losses due to protein/membrane interactions (i.e. adsorption, "secondary membrane formation" and denaturation). The former are fairly easy to determine, usually varying at the level of ~ 2 g to ~ 7 g albumin loss per session. Such values, commonly accepted as representative of the total albumin losses, are often quoted as limits/standards of permissible albumin loss per session. On albumin mass lost due to adsorption/deposition, which is the result of complicated interactions and rather difficult to determine, scant in vivo data exist and there is great uncertainty and confusion regarding their magnitude; this is possibly responsible for neglecting their contribution to the total losses at present. Yet, many relevant in vitro studies suggest that losses of albumin due to protein/membrane interactions are likely comparable to (or even greater than) those due to leaking, particularly in the currently favoured high-convection HDF (haemodiafiltration) treatment. Therefore, it is emphasised that top research priority should be given to resolve these issues, primarily by developing appropriate/facile in vivo test-methods and related analytical techniques.
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Affiliation(s)
- Anastasios J Karabelas
- Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas, 6th Km Charilaou - Thermi Road, Thermi - Thessaloniki, GR 57001, Greece.
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Abe M, Kikuchi K, Wada A, Nakai S, Kanda E, Hanafusa N. Current dialyzer classification in Japan and mortality risk in patients undergoing hemodialysis. Sci Rep 2024; 14:10272. [PMID: 38704419 PMCID: PMC11069571 DOI: 10.1038/s41598-024-60831-y] [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: 02/04/2024] [Accepted: 04/27/2024] [Indexed: 05/06/2024] Open
Abstract
Dialyzers are classified into five types based on their β2-microglobulin clearance rate and albumin sieving coefficient: Ia, Ib, IIa, and IIb. In addition, a new classification system introduced a type S dialyzer. However, limited information is available regarding the impact of dialyzer type on patient outcomes. A cohort study was conducted using data from the Japanese Society for Dialysis Therapy Renal Data Registry database. Total 181,804 patients on hemodialysis (HD) were included in the study, categorized into four groups (type Ia, IIa, IIb, and S). The associations between each group and two-year all-cause mortality were assessed using Cox proportional hazard models. Furthermore, propensity score-matching analysis was performed. By the end of 2019, 34,185 patients on dialysis had died. After adjusting for all confounders, the risk for all-cause mortality was significantly lower in the type IIa, and S groups than in the type Ia group. These significant findings were consistent after propensity score matching. In conclusion, our findings suggest that super high-flux dialyzers, with a β2-microglobulin clearance of ≥ 70 mL/min, may be beneficial for patients on HD, regardless of their albumin sieving coefficient. In addition, type S dialyzers may be beneficial for elderly and malnourished patients on dialysis.Trial registration number: UMIN000018641.
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Affiliation(s)
- Masanori Abe
- Committee of Renal Data Registry, Japanese Society for Dialysis Therapy, Tokyo, Japan.
- Division of Nephrology, Hypertension, and Endocrinology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan.
| | - Kan Kikuchi
- Committee of Renal Data Registry, Japanese Society for Dialysis Therapy, Tokyo, Japan
- Division of Nephrology, Shimoochiai Clinic, Tokyo, Japan
| | - Atsushi Wada
- Committee of Renal Data Registry, Japanese Society for Dialysis Therapy, Tokyo, Japan
- Department of Nephrology, Kitasaito Hospital, Asahikawa, Japan
| | - Shigeru Nakai
- Committee of Renal Data Registry, Japanese Society for Dialysis Therapy, Tokyo, Japan
- Department of Clinical Engineering, Fujita Health University, Aichi, Japan
| | - Eiichiro Kanda
- Committee of Renal Data Registry, Japanese Society for Dialysis Therapy, Tokyo, Japan
- Department of Medical Science, Kawasaki Medical School, Kurashiki, Japan
| | - Norio Hanafusa
- Committee of Renal Data Registry, Japanese Society for Dialysis Therapy, Tokyo, Japan
- Department of Blood Purification, Tokyo Women's Medical University, Tokyo, Japan
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3
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Pitaraki E, Jagirdar RM, Rouka E, Bartosova M, Sinis SI, Gourgoulianis KI, Eleftheriadis T, Stefanidis I, Liakopoulos V, Hatzoglou C, Schmitt CP, Zarogiannis SG. 2-Deoxy-glucose ameliorates the peritoneal mesothelial and endothelial barrier function perturbation occurring due to Peritoneal Dialysis fluids exposure. Biochem Biophys Res Commun 2024; 693:149376. [PMID: 38104523 DOI: 10.1016/j.bbrc.2023.149376] [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: 10/12/2023] [Revised: 12/05/2023] [Accepted: 12/08/2023] [Indexed: 12/19/2023]
Abstract
Peritoneal dialysis (PD) and prolonged exposure to PD fluids (PDF) induce peritoneal membrane (PM) fibrosis and hypervascularity, leading to functional PM degeneration. 2-deoxy-glucose (2-DG) has shown potential as PM antifibrotic by inhibiting hyper-glycolysis induced mesothelial-to-mesenchymal transition (MMT). We investigated whether administration of 2-DG with several PDF affects the permeability of mesothelial and endothelial barrier of the PM. The antifibrotic effect of 2-DG was confirmed by the gel contraction assay with embedded mesothelial (MeT-5A) or endothelial (EA.hy926) cells cultured in Dianeal® 2.5 % (CPDF), BicaVera® 2.3 % (BPDF), Balance® 2.3 % (LPDF) with/without 2-DG addition (0.2 mM), and qPCR for αSMA, CDH2 genes. Moreover, 2-DG effect was tested on the permeability of monolayers of mesothelial and endothelial cells by monitoring the transmembrane resistance (RTM), FITC-dextran (10, 70 kDa) diffusion and mRNA expression levels of CLDN-1 to -5, ZO1, SGLT1, and SGLT2 genes. Contractility of MeT-5A cells in CPDF/2-DG was decreased, accompanied by αSMA (0.17 ± 0.03) and CDH2 (2.92 ± 0.29) gene expression fold changes. Changes in αSMA, CDH2 were found in EA.hy926 cells, though αSMA also decreased under LPDF/2-DG incubation (0.42 ± 0.02). Overall, 2-DG mitigated the PDF-induced alterations in mesothelial and endothelial barrier function as shown by RTM, dextran transport and expression levels of the CLDN-1 to -5, ZO1, and SGLT2. Thus, supplementation of PDF with 2-DG not only reduces MMT but also improves functional permeability characteristics of the PM mesothelial and endothelial barrier.
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Affiliation(s)
- Eleanna Pitaraki
- Department of Physiology, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece
| | - Rajesh M Jagirdar
- Department of Physiology, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece
| | - Erasmia Rouka
- Department of Nursing, School of Health Sciences, University of Thessaly, GAIOPOLIS, 41500, Larissa, Greece
| | - Maria Bartosova
- Pediatric Nephrology, Center for Pediatrics and Adolescent Medicine, University of Heidelberg, 69120, Heidelberg, Germany
| | - Sotirios I Sinis
- Department of Physiology, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece; Department of Respiratory Medicine, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece
| | - Konstantinos I Gourgoulianis
- Department of Respiratory Medicine, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece
| | - Theodoros Eleftheriadis
- Department of Nephrology, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece
| | - Ioannis Stefanidis
- Department of Nephrology, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece
| | - Vassilios Liakopoulos
- 2(nd) Department of Nephrology, AHEPA Hospital, Aristotle University of Thessaloniki, 54636, Thessaloniki, Greece
| | - Chrissi Hatzoglou
- Department of Physiology, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece
| | - Claus Peter Schmitt
- Pediatric Nephrology, Center for Pediatrics and Adolescent Medicine, University of Heidelberg, 69120, Heidelberg, Germany
| | - Sotirios G Zarogiannis
- Department of Physiology, Faculty of Medicine, School of Health Sciences, University of Thessaly, BIOPOLIS, 41500, Larissa, Greece.
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Akl EM, El-Eraki JM, Elfallah AA, Mohamed NH, Maher AM, Mansour AE, Abdelsalam OH. Does Indoxyl Sulfate Have a Role in Uremic Pruritus? A Laboratory and Interventional Study. J Cutan Med Surg 2024; 28:44-50. [PMID: 38156627 DOI: 10.1177/12034754231220935] [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: 01/03/2024]
Abstract
BACKGROUND Pruritus is a common complaint in patients with end-stage renal disease. Indoxyl sulfate (IS) is a tryptophan end metabolite extremely renal excreted. Activated charcoal can interfere with IS intestinal absorption. OBJECTIVES To evaluate the serum level of IS and the effect of activated charcoal on uremic pruritus. MATERIALS AND METHODS In all, 135 participants were divided into 2 main groups. In total, 45 normal and healthy individuals as a control group and 90 patients on regular hemodialysis; 45 of these patients had uremic pruritus and the other 45 were not complaining of uremic pruritus. Serum IS was measured. Activated charcoal was used by patients with uremic pruritus. The severity of pruritus and Dermatology Life Quality Index (DLQI) were assessed. RESULTS The serum IS was significantly elevated in uremic patients than in control subjects (P < .001) and significantly elevated in uremic patients without pruritus (P < .001). Furthermore, there were positive significant correlations between the serum IS and both severity of pruritus (P < .001) and DLQI (P < .001). After activated charcoal usage, there was a significant decrease in IS level with the improvement of pruritus and quality of life of patients. CONCLUSIONS IS may play a role in uremic pruritus. Activated charcoal could be considered a treatment for uremic pruritus.
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Affiliation(s)
- Essam Mohamed Akl
- Department of Dermatology and Andrology, Faculty of Medicine, Benha University, Benha, Egypt
| | - Jeylan M El-Eraki
- Specialist of Dermatology and Andrology, Ministry of Health and Population, Cairo, Egypt
| | - Assma A Elfallah
- Department of Clinical Pathology, Faculty of Medicine, Benha University, Benha, Egypt
| | - Nelly H Mohamed
- Specialist of Clinical Pathology, Ministry of Health and Population, Benha, Egypt
| | - Amr M Maher
- Specialist of Internal Medicine, Ministry of Health and Population, Cairo, Egypt
| | - Ahmed E Mansour
- Department of Internal Medicine, Faculty of Medicine, Benha University, Benha, Egypt
| | - Osama H Abdelsalam
- Department of Dermatology and Andrology, Faculty of Medicine, Benha University, Benha, Egypt
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Molina P, Goicoechea M, Huarte E, Maduell F, Valero A, Martín-Malo A. Hemodiafiltration with endogenous reinfusion of the regenerated ultrafiltrate (HFR): towards a convective, diffusive, and adsorptive dialysis. Nefrologia 2023; 43:688-702. [PMID: 38176980 DOI: 10.1016/j.nefroe.2023.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 06/28/2023] [Indexed: 01/06/2024] Open
Abstract
Hemodiafiltration with endogenous reinfusion of the ultrafiltrate (HFR) is a dialysis technique characterized by a resin cartridge with adsorptive properties that combines the mechanisms of diffusion, convection, and adsorption in a single therapeutic regimen. After nearly 20 years of clinical experience with HFR, this article reviews the accumulated evidence with this technique, considering whether adsorption reduction, as a third purification mechanism, should be the next step in the treatment of hemodialysis patients. HFR, beyond producing an extensive removal of uremic toxins, has demonstrated to reduce the loss of nutrients and other physiological components during the dialysis session as compared to online hemodiafiltration, ameliorating the inflammatory state and oxidative stress in this population. In addition to its ease of use, the technique is also highly biocompatible and can be used in patients with a compromised vascular access. Based on these observations, HFR appears to be an especially useful therapy for high-comorbidity patients, including those with frailty, malnutrition, or cardiovascular disease. In this review, we, as a consensus panel of nephrologists experienced with HFR, survey existing literature and summarize our views on when to use this technique, which patients may be best suited for HFR, and how to effectively prescribe and monitor this modality of dialysis in daily clinical practice.
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Affiliation(s)
- Pablo Molina
- Servicio de Nefrología, Hospital Universitari Dr. Peset, Universitat de València, FISABIO, Valencia, Spain.
| | - Marian Goicoechea
- Servicio de Nefrología, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - Emma Huarte
- Servicio de Nefrología, Hospital de San Pedro, Logroño, Spain
| | - Francisco Maduell
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
| | - Alejandro Valero
- Servicio de Nefrología, Hospital Universitari Dr. Peset, Universitat de València, FISABIO, Valencia, Spain
| | - Alejandro Martín-Malo
- Servicio de Nefrología, Hospital Universitario Reina Sofía, Universidad de Córdoba, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Red Nacional de Investigación en Nefrología (REDinREN), Instituto de Salud Carlos III, Spain
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6
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El-Hendy YAM, Ismail MI, Borai MM, Abdelhamid WAR. Relationship between High-density Lipoprotein Cholesterol and Insulin Resistance in Non-diabetic Chronic Kidney Disease Patients. SAUDI JOURNAL OF KIDNEY DISEASES AND TRANSPLANTATION 2023; 34:323-330. [PMID: 38345587 DOI: 10.4103/1319-2442.395448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2024] Open
Abstract
Insulin resistance is linked to cardiovascular disease (CVD), even in non-diabetic patients. Therefore, insulin resistance contributes to the development of CVDs, which are the most important cause of morbidity and mortality in chronic kidney disease (CKD) and patients receiving dialysis replacement therapy. Furthermore, CKD greatly affects the enzyme activities responsible for the metabolism of high-density lipoprotein (HDL), causing an abnormal composition and function of HDL, which results in the loss of the anti-inflammatory effect of HDL and its protective effect against CVD. The study aimed to find the relationship between HDL-C, inflammation, and insulin resistance in nondiabetic CKD patients undergoing different modalities of treatment. This prospective cross-sectional comparative study included 80 subjects divided into the control group (20 healthy participants), Group 1 (15 predialysis CKD patients on conservative treatment), Group 2 (10 peritoneal dialysis patients), and Group 3 (35 hemodialysis patients). A full history, medical examination, and a laboratory investigation were carried out on all subjects from June 2018 to June 2019. The patient groups had significantly lower HDL and higher serum insulin than the control group. HDL was negatively correlated with the Homeostatic Model Assessment of Insulin Resistance. There was a strong negative association between HDL and insulin resistance in CKD patients. Therefore, lifestyle modifications and dyslipidemia treatment in CKD might help to prevent cardiovascular events even in nondiabetic nonobese CKD patients.
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Affiliation(s)
| | - Mabrouk Ibrahim Ismail
- Department of Internal Medicine, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Maher Mohamed Borai
- Department of Clinical Pathology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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Hemodiafiltration: Technical and Medical Insights. Bioengineering (Basel) 2023; 10:bioengineering10020145. [PMID: 36829639 PMCID: PMC9952158 DOI: 10.3390/bioengineering10020145] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
Despite the significant medical and technical improvements in the field of dialytic renal replacement modalities, morbidity and mortality are excessively high among patients with end-stage kidney disease, and most interventional studies yielded disappointing results. Hemodiafiltration, a dialysis method that was implemented in clinics many years ago and that combines the two main principles of hemodialysis and hemofiltration-diffusion and convection-has had a positive impact on mortality rates, especially when delivered in a high-volume mode as a surrogate for a high convective dose. The achievement of high substitution volumes during dialysis treatments does not only depend on patient characteristics but also on the dialyzer (membrane) and the adequately equipped hemodiafiltration machine. The present review article summarizes the technical aspects of online hemodiafiltration and discusses present and ongoing clinical studies with regards to hard clinical and patient-reported outcomes.
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8
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Okada K, Tashiro M, Michiwaki H, Inoue T, Shima H, Minakuchi J, Kawashima S. Effects of high albumin leakage on survival between online hemodiafiltration and super high-flux hemodialysis: the HISTORY study. RENAL REPLACEMENT THERAPY 2022. [DOI: 10.1186/s41100-022-00440-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
All-cause mortality is lower with a high substitution volume in predilution (pre) and postdilution (post) online hemodiafiltration (OHDF) than with hemodialysis (HD), and mortality does not significantly differ between pre- and post-OHDF groups. Despite the improved survival with a high substitution volume, there may be limitations. On the other hand, either normoalbuminemia or high albumin leakage in HD can reduce mortality, and super high-flux (SHF) membrane dialyzers can reduce mortality compared with low-flux and high-flux membrane dialyzers. Here, we investigated the associations of serum albumin concentration (s-Alb), albumin leakage, and substitution volume with all-cause mortality in OHDF and SHF-HD.
Methods
In a 3-year retrospective observational study of patients receiving dialysis from April 1 to July 1, 2017, we developed a propensity score-matched model using 783 stable patients (SHF-HD, 355; OHDF, 428). We used the log-rank test to compare Kaplan–Meier survival curves and Cox regression analysis to calculate hazard ratio (HR). Cox regression analysis was also used to compare the effect of estimated albumin leakage (EAL) and substitution volume on 3-year all-cause mortality.
Results
All-cause mortality was significantly lower with high EAL than with low EAL (SHF-HD: P = 0.012, log-rank test; HR, 0.44; 95% confidence interval [CI] 0.23–0.85; OHDF: P = 0.027, log-rank test; HR, 0.41; 95% CI 0.18–0.93). The mortality of high EAL was not significantly different between high and low s-Alb in SHF-HD (3.5 ± 0.1 and 3.2 ± 0.2 g/dL) and OHDF (3.6 ± 0.2 and 3.2 ± 0.1 g/dL), despite significant differences in s-Alb. Mortality did not significantly differ between SHF-HD and OHDF with higher EAL ranges or a lower difference in EAL. Mortality in pre-OHDF was significantly correlated with EAL (P = 0.007, beta − 0.32) rather than substitution volume, and mortality in post-OHDF was not analyzed because of fewer deaths.
Conclusions
The results suggest that survival is improved more with high EAL than with low EAL in both OHDF and SHF-HD patients, that high EAL with mild-to-moderate hypoalbuminemia does not necessarily worsen survival in OHDF and SHF-HD patients, and that survival is equivalent between OHDF and SHF-HD patients with a similar level of EAL.
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Ward RA. Basic prerequisites for on-line, high-volume hemodiafiltration. Semin Dial 2022; 35:385-389. [PMID: 35315951 DOI: 10.1111/sdi.13073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Accepted: 03/05/2022] [Indexed: 11/29/2022]
Abstract
High-volume hemodiafiltration involves filtration of >23 L/treatment and its replacement by sterile non-pyrogenic substitution fluid, while maintaining the patient's fluid balance. That volume of substitution fluid precludes the use of prepackaged sterile fluid. Instead, substitution fluid must be prepared on-line using machines that incorporate a series of bacteria- and endotoxin-retentive filters. The sterilizing ultrafilters are validated to deliver sterile, non-pyrogenic fluid to the patient when operated according to the machine manufacturer's instructions and in compliance with international standards and regulatory oversight. A successful hemodiafiltration program also places important responsibilities on the user. Specifically, the user is responsible for ensuring that the dialysis water or dialysis fluid delivered to the sterilizing filters of the hemodiafiltration machine meets the machine manufacturer's specifications and is consistent with the quality used in the sterilization validation process. The user is also responsible for ensuring that the treatment prescription allows a filtration volume >23 L/treatment to be achieved by careful selection of a dialyzer, blood flow rate and treatment time. Questions related to assurance that the substitution fluid will routinely be sterile and non-pyrogenic have limited the uptake of on-line hemodiafiltration as a therapeutic option in some countries, such as the United States.
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Mizuiri S, Nishizawa Y, Doi T, Okubo A, Shigemoto K, Usui K, Arita M, Naito T, Doi S, Masaki T. Convection volume, β2-microglobulin and α1-microglobulin reduction ratios, and body composition in predilution online haemodiafiltration. Nephrology (Carlton) 2022; 27:601-609. [PMID: 35278013 DOI: 10.1111/nep.14038] [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: 12/14/2021] [Revised: 02/24/2022] [Accepted: 03/07/2022] [Indexed: 11/28/2022]
Abstract
AIM The effect of convection volume (CV) in patients on predilution online haemodiafiltration (Pre-OL-HDF) was evaluated. METHODS We conducted a retrospective, cross-sectional study in 126 patients on Pre-OL-HDF. Dialysis conditions, laboratory data, and same day post-dialysis body composition measurements using bioimpedance spectroscopy were assessed. Patients were divided into two groups according to their CV: ≥ median value and < median value. Linear regression analyses for reduction ratios (RRs) of β2-microglobulin and α1-microglobulin, and body composition, were conducted. RESULTS Age, dialysis vintage, and CVs of the study patients were 64 ± 12 years, 81 (48-154) months, and 43.2 (38.5-55.9) L/session, respectively. The higher CV (≥ 43 L/session) group (n=66) had significantly higher RRs of β2-microglobulin and α1-microglobulin, lean tissue index, body cell mass index, total body water (TBW), extracellular water (ECW), and intracellular water (ICW) compared with the lower CV (< 43 L/session) group (n = 60; P < 0.01). Serum albumin and fat tissue index were not significantly different between the groups. CV/ECW, CV/TBW, and CV/ICW but not un-adjusted CV, were significant determinants for β2-microglobulin and α1-microglobulin RRs (P < 0.05). Lean tissue and body cell mass indexes, but not the fat tissue index, showed significant associations with CV, and RRs of β2-microglobulin and α1-microglobulin (P < 0.05). CONCLUSIONS Among patients on Pre-OL-HDF, higher values in the lean tissue index and body cell mass index were observed in those with higher CV versus lower CV, and CV adjusted to body water may be useful to prescribe individualized conditions for Pre-OL-HDF. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Sonoo Mizuiri
- Division of Nephrology, Ichiyokai Harada Hospital, 7-10 Kairoyama-cho, Saeki-ku, Hiroshima, Japan
| | - Yoshiko Nishizawa
- Division of Nephrology, Ichiyokai Harada Hospital, 7-10 Kairoyama-cho, Saeki-ku, Hiroshima, Japan
| | - Toshiki Doi
- Division of Nephrology, Ichiyokai Harada Hospital, 7-10 Kairoyama-cho, Saeki-ku, Hiroshima, Japan.,Department of Nephrology, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima, Japan
| | - Aiko Okubo
- Division of Nephrology, Ichiyokai Harada Hospital, 7-10 Kairoyama-cho, Saeki-ku, Hiroshima, Japan.,Department of Nephrology, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima, Japan
| | - Kenichiro Shigemoto
- Division of Nephrology, Ichiyokai Harada Hospital, 7-10 Kairoyama-cho, Saeki-ku, Hiroshima, Japan
| | - Koji Usui
- Ichiyokai Ichiyokai Clinic, 10-3 Asahien, Saeki-ku, Hiroshima, Japan
| | - Michiko Arita
- Iciyokai East Clinic, 1-3-53 Danbaraminami Minami-ku, Hiroshima, Japan
| | - Takayuki Naito
- Ichiyokai Yokogawa Clinic, 2-7-9 Yokogawacho Nishi-ku, Hiroshima, Japan
| | - Shigehiro Doi
- Department of Nephrology, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima, Japan
| | - Takao Masaki
- Department of Nephrology, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima, Japan
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Zhou M, Ficociello LH, Mullon C, Mooney A, Williamson D, Anger MS. Real-World Performance of High-Flux Dialyzers in Patients With Hypoalbuminemia. ASAIO J 2022; 68:96-102. [PMID: 34172639 PMCID: PMC8700293 DOI: 10.1097/mat.0000000000001511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
There is little research on factors that influence the choice of dialyzer in patients undergoing hemodialysis. In patients at risk for poorer outcomes, including those with hypoalbuminemia, understanding how this choice impacts clinical parameters could inform patient management. The objective of this real-world analysis was to evaluate the use and performance of four single-use (i.e., nonreuse [NR]), high-flux Optiflux dialyzers with varying surface areas (F160NR [1.5 m2], F180NR [1.7 m2], F200NR [1.9 m2], and F250NR [2.5 m2]) in patients (N = 271) with baseline hypoalbuminemia (≤3.5 g/dl) receiving hemodialysis at a medium-sized dialysis organization. Thrice weekly, in-center dialysis was delivered for 6 months without adjustments to the hemodialysis prescription. Larger dialyzers were more frequently used in men, patients with higher body mass indices, and those with diabetes. Increases in serum albumin from baseline (month 1) to month 6 (p < 0.05) were observed with all dialyzer sizes. A mean increase in hemoglobin of 0.31 g/dl was also observed (p < 0.001). Among patients exhibiting increased serum albumin levels (n = 177), reductions in the neutrophil-to-lymphocyte ratio, a marker of inflammation, were observed (mean: 0.90; p < 0.001). These results support the use of high-flux dialyzers in patients with hypoalbuminemia.
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Affiliation(s)
- Meijiao Zhou
- From the Fresenius Medical Care Renal Therapies Group, Waltham, Massachusetts
| | - Linda H. Ficociello
- From the Fresenius Medical Care Renal Therapies Group, Waltham, Massachusetts
| | - Claudy Mullon
- From the Fresenius Medical Care Renal Therapies Group, Waltham, Massachusetts
| | - Ann Mooney
- American Renal Associates, Beverly, Massachusetts
| | | | - Michael S. Anger
- From the Fresenius Medical Care Renal Therapies Group, Waltham, Massachusetts
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van de Wouw J, Joles JA. Albumin is an interface between blood plasma and cell membrane, and not just a sponge. Clin Kidney J 2021; 15:624-634. [PMID: 35371452 PMCID: PMC8967674 DOI: 10.1093/ckj/sfab194] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Indexed: 12/16/2022] Open
Abstract
Albumin is the most abundant protein in blood plasma and acts as a carrier for many circulating molecules. Hypoalbuminaemia, mostly caused by either renal or liver disease or malnutrition, can perturb vascular homeostasis and is involved in the development of multiple diseases. Here we review four functions of albumin and the consequences of hypoalbuminaemia on vascular homeostasis. (i) Albumin is the main determinant of plasma colloid osmotic pressure. Hypoalbuminaemia was therefore thought to be the main mechanism for oedema in nephrotic syndrome (NS), however, experimental studies showed that intrarenal mechanisms rather than hypoalbuminaemia determine formation and, in particular, maintenance of oedema. (ii) Albumin functions as an interface between lysophosphatidylcholine (LPC) and circulating factors (lipoproteins and erythrocytes) and the endothelium. Consequently, hypoalbuminaemia results in higher LPC levels in lipoproteins and erythrocyte membrane, thereby increasing atherosclerotic properties of low-density lipoprotein and blood viscosity, respectively. Furthermore, albumin dose-dependently restores LPC-induced inhibition of vasodilation. (iii) Hypoalbuminaemia impacts on vascular nitric oxide (NO) signalling by directly increasing NO production in endothelial cells, leading to reduced NO sensitivity of vascular smooth muscle cells. (iv) Lastly, albumin binds free fatty acids (FFAs). FFAs can induce vascular smooth muscle cell apoptosis, uncouple endothelial NO synthase and decrease endothelium-dependent vasodilation. Unbound FFAs can increase the formation of reactive oxygen species by mitochondrial uncoupling in multiple cell types and induce hypertriglyceridemia in NS. In conclusion, albumin acts as an interface in the circulation and hypoalbuminaemia impairs multiple aspects of vascular function that may underlie the association of hypoalbuminaemia with adverse outcomes. However, hypoalbuminaemia is not a key to oedema in NS. These insights have therapeutic implications.
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Affiliation(s)
| | - Jaap A Joles
- Department of Nephrology and Hypertension, University Medical Center, Utrecht, the Netherlands
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Donati G, Cappuccilli M, Donadei C, Righini M, Scrivo A, Gasperoni L, Zappulo F, La Manna G. Toxin Removal and Inflammatory State Modulation during Online Hemodiafiltration Using Two Different Dialyzers (TRIAD2 Study). Methods Protoc 2021; 4:mps4020026. [PMID: 33921921 PMCID: PMC8167554 DOI: 10.3390/mps4020026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 04/07/2021] [Accepted: 04/08/2021] [Indexed: 11/16/2022] Open
Abstract
Uremic toxins play a pathological role in atherosclerosis and represent an important risk factor in dialysis patients. Online hemodiafiltration (HDF) has been introduced to improve the clearance of middle- and large-molecular-weight solutes (>500 Da) and has been associated with reduced cardiovascular mortality compared to standard hemodialysis. This non-randomized, open-label observational study will explore the efficacy of two dialyzers currently used for online HDF, a polysulfone-based high-flux membrane, and a cellulose triacetate membrane, in hemodialysis patients with signs of middle-molecule intoxication or intradialytic hypotension. In particular, the two filters will be evaluated for their ability in uremic toxin removal and modulation of inflammatory status. Sixteen subjects in standard chronic bicarbonate hemodialysis requiring a switch to online HDF in view of their clinical status will be enrolled and divided into two treatment arms, according to the previous history of hypersensitivity to polysulfone/polyethersulfone dialysis filters and hypersensitivity to drugs or other allergens. Group A will consist of 16 patients without a previous history of hypersensitivity and will be treated with a polysulfone filter (Helixone FX100), and group B, also consisting of 16 patients, with a previous history of hypersensitivity and will be treated with asymmetric triacetate (ATA; SOLACEA 21-H) dialyzer. Each patient will be followed for a period of 24 months, with monthly assessments of circulating middle-weight toxins and protein-bound toxins, markers of inflammation and oxidative stress, lymphocyte subsets, activated lymphocytes, and monocytes, cell apoptosis, the accumulation of advanced glycation end-products (AGEs), variations in arterial stiffens measured by pulse wave velocity (PWV), and mortality rate. The in vitro effect on endothelial cells of uremic serum collected from patients treated with the two different dialyzers will also be investigated to examine the changes in angiogenesis, cell migration, differentiation, apoptosis and proliferative potential, and gene and protein expression profile. The expected results will be a better awareness of the different effects of polysulfone gold-standard membrane for online HDF and the new ATA membrane on the removal of uremic toxins removal and inflammation due to blood-membrane interaction.
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Kalantar-Zadeh K, Ficociello LH, Bazzanella J, Mullon C, Anger MS. Slipping Through the Pores: Hypoalbuminemia and Albumin Loss During Hemodialysis. Int J Nephrol Renovasc Dis 2021; 14:11-21. [PMID: 33505168 PMCID: PMC7829597 DOI: 10.2147/ijnrd.s291348] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 12/30/2020] [Indexed: 12/12/2022] Open
Abstract
Hypoalbuminemia results when compensatory mechanisms are unable to keep pace with derangements in catabolism/loss and/or decreased synthesis of albumin. Across many disease states, including chronic kidney disease (CKD), hypoalbuminemia is a well-established, independent risk factor for adverse outcomes, including mortality. In the setting of CKD, reduced serum albumin concentrations are often a manifestation of protein-energy wasting, a state of metabolic and nutritional alterations resulting in reduced protein and energy stores. The progression of CKD to kidney failure and the initiation of maintenance hemodialysis (HD) further predisposes an already at-risk population toward hypoalbuminemia such that approximately 60% of HD patients have albumin concentrations <4.0 g/dl. Albumin loss into the dialysate through the dialyzer appears to be a potentially modifiable cause of hypoalbuminemia in some patients. A group of newer dialyzers for maintenance HD-sometimes termed protein-leaking or medium cut-off membranes-aim to improve clearance of middle molecules (vs high flux dialyzers) but are associated with increased albumin losses. In this article, we will examine the impact of dialyzer selection on albumin losses during conventional HD, including the clinical relevance of such losses on serum albumin levels. Data on the clinical relevance of albumin losses during dialysis and current gaps in the evidence base are also discussed.
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Affiliation(s)
- Kamyar Kalantar-Zadeh
- Division of Nephrology, Hypertension and Kidney Transplantation, University of California, Irvine, School of Medicine, Orange, CA, USA
- Department of Epidemiology, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
- Los Angeles Biomedical Research Institute at Harbor–UCLA, Torrance, CA, USA
| | | | | | - Claudy Mullon
- Fresenius Medical Care Renal Therapies Group, Waltham, MA, USA
| | - Michael S Anger
- Fresenius Medical Care Renal Therapies Group, Waltham, MA, USA
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15
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Sevinc M, Hasbal NB, Yilmaz V, Basturk T, Ahbap E, Sakaci T, Ozcafer PN, Unsal A. Comparison of Circulating Levels of Uremic Toxins in Hemodialysis Patients Treated with Medium Cut-Off Membranes and High-Flux Membranes: Theranova in Sisli Hamidiye Etfal (THE SHE) Randomized Control Study. Blood Purif 2020; 49:733-742. [PMID: 32634815 DOI: 10.1159/000508061] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 04/20/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Removal of uremic toxins is a main objective of hemodialysis; however, whether high-flux and medium cut-off (MCO) membranes differ as regards removal of middle and large uremic toxins is not clear. OBJECTIVE To compare medium cut-off and high-flux dialyzers as regards their intra- and interdialysis effect on circulating levels of middle and large uremic toxins and serum albumin. METHODS Fifty-two patients were randomized to have hemodialysis with either 3 months of high-flux dialyzer followed by 3 months of MCO or vice versa. Blood samples were taken before and after dialysis at the first and last sessions of each dialyzer for analyses of middle and large uremic toxins including inflammatory mediators and vascular endothelial growth factor (VEGF), and serum albumin. RESULTS Reduction rates were higher, and postdialysis levels of β-2 microglobulin, free kappa and lambda light chains, and myoglobulin were lower at the first and last sessions with MCO dialyzers compared to high-flux dialyzers (p < 0.05 for all). Last session predialysis levels of β-2 microglobulin, free kappa light chain, and free lambda light chain were lower than first session predialysis levels in MCO dialyzers as compared to high-flux dialyzers (p < 0.05 for all). Last session levels of interleukin-6, interleukin-10, interleukin-17, and interferon-gamma did not differ between dialyzers (p > 0.05 for all). VEGF level was lower in the MCO group compared to the high-flux group (p = 0.043). Last session level of serum albumin with MCO dialyzers was lower than that with high-flux dialyzers (3.62 [3.45-3.88] vs. 3.78 [3.58-4.02] g/L) (p = 0.04) and 6.7% lower (p < 0.001) than at the first session of MCO dialyzers. CONCLUSION The decline in circulating levels of several middle and large uremic toxins including VEGF following hemodialysis was more pronounced when using MCO membranes as compared to high-flux membranes while their effect on inflammatory molecules was similar.
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Affiliation(s)
- Mustafa Sevinc
- Nephrology Department, Sisli Hamidiye Etfal Education and Research Hospital, Istanbul, Turkey
| | | | - Vuslat Yilmaz
- Neuroscience Department, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Taner Basturk
- Nephrology Department, University of Health Sciences, Sisli Hamidiye Etfal Education and Research Hospital, Istanbul, Turkey,
| | - Elbis Ahbap
- Nephrology Department, Sisli Hamidiye Etfal Education and Research Hospital, Istanbul, Turkey
| | - Tamer Sakaci
- Nephrology Department, Sisli Hamidiye Etfal Education and Research Hospital, Istanbul, Turkey
| | - Perin Nazif Ozcafer
- Nephrology Department, Sisli Hamidiye Etfal Education and Research Hospital, Istanbul, Turkey
| | - Abdulkadir Unsal
- Nephrology Department, University of Health Sciences, Sisli Hamidiye Etfal Education and Research Hospital, Istanbul, Turkey
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16
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Huang C, Ren J, Ji F, Muyldermans S, Jia L. Nanobody-Based high-performance immunosorbent for selective beta 2-microglobulin purification from blood. Acta Biomater 2020; 107:232-241. [PMID: 32092428 DOI: 10.1016/j.actbio.2020.02.028] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 02/14/2020] [Accepted: 02/18/2020] [Indexed: 12/18/2022]
Abstract
Removing β2-microglobulin (β2M) from blood circulation is considered to be the most effective method to delay the occurrence of dialysis-related amyloidosis (DRA). The ideal extracorporeal β2M removal system should be cost-effective, highly specific and having a high capacity. However, the traditional technologies based on size exclusion do not have an adequate specificity, and alternative immunosorbents have limited applications due to low capacity and their high cost. Nanobodies (Nbs), the smallest functional recombinant antibody fragments, offer several advantages to overcome these obstacles. In this study, an anti-β2M Nb with a C-terminal thiol-tag was successfully prepared from E. coli for site-directed and oriented immobilization and usage as capture ligand in a β2M-selective immunosorbent. The prepared immunosorbent showed a high binding capacity of up to 7 mg β2M per mL resin, which is 17 times higher than that of previous studies using single-chain variable antibody fragments (scFv). Furthermore, an exceptional high specificity has been demonstrated as other human serum proteins were not adsorbed during dynamic adsorption experiments. About 80% of the original binding capacity of the immunosorbent was restored after four consecutive easy regenerations, whereas 90% of the original capacity was retained after 1-month storage of the resin. Moreover, the mathematical model fitted very well the in vitro perfusion. The results with this pioneering immunosorbent confirm its possible clinical application and is expected to reach the required clinical effect of immunoadsorption therapy. STATEMENT OF SIGNIFICANCE: Dialysis-related amyloidosis (DRA), associated with the accumulation of β2-microglobulin (β2M), is a serious complication of end-stage kidney disease. Removing β2M from blood circulation by extracorporeal blood purification is considered to be the most effective method to delay the occurrence of DRA. However, the existing methods are incapable to eliminate sufficient quantities of β2M from circulation, either because of lack of specificity, high cost or for low capacity. In this manuscript, we provide a practical and economic immunosorbent based on anti-β2M nanobody for DRA. The prepared immunosorbent was reusable and storable, and demonstrated high specificity and realized a high binding capacity of up to 7 mg β2M per mL resin, which is 17 times higher than that of the previous studies.
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17
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Intradialytic Nutrition and Hemodialysis Prescriptions: A Personalized Stepwise Approach. Nutrients 2020; 12:nu12030785. [PMID: 32188148 PMCID: PMC7146606 DOI: 10.3390/nu12030785] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/11/2020] [Accepted: 03/13/2020] [Indexed: 12/11/2022] Open
Abstract
Dialysis and nutrition are two sides of the same coin—dialysis depurates metabolic waste that is typically produced by food intake. Hence, dietetic restrictions are commonly imposed in order to limit potassium and phosphate and avoid fluid overload. Conversely, malnutrition is a major challenge and, albeit to differing degrees, all nutritional markers are associated with survival. Dialysis-related malnutrition has a multifactorial origin related to uremic syndrome and comorbidities but also to dialysis treatment. Both an insufficient dialysis dose and excessive removal are contributing factors. It is thus not surprising that dialysis alone, without proper nutritional management, often fails to be effective in combatting malnutrition. While composite indexes can be used to identify patients with poor prognosis, none is fully satisfactory, and the definitions of malnutrition and protein energy wasting are still controversial. Furthermore, most nutritional markers and interventions were assessed in hemodialysis patients, while hemodiafiltration and peritoneal dialysis have been less extensively studied. The significant loss of albumin in these two dialysis modalities makes it extremely difficult to interpret common markers and scores. Despite these problems, hemodialysis sessions represent a valuable opportunity to monitor nutritional status and prescribe nutritional interventions, and several approaches have been tried. In this concept paper, we review the current evidence on intradialytic nutrition and propose an algorithm for adapting nutritional interventions to individual patients.
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18
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Charcoal for the management of pruritus and uremic toxins in patients with chronic kidney disease. Curr Opin Nephrol Hypertens 2020; 29:71-79. [DOI: 10.1097/mnh.0000000000000567] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Shroff R, Smith C, Ranchin B, Bayazit AK, Stefanidis CJ, Askiti V, Azukaitis K, Canpolat N, Ağbaş A, Aitkenhead H, Anarat A, Aoun B, Aofolaju D, Bakkaloglu SA, Bhowruth D, Borzych-Dużałka D, Bulut IK, Büscher R, Deanfield J, Dempster C, Duzova A, Habbig S, Hayes W, Hegde S, Krid S, Licht C, Litwin M, Mayes M, Mir S, Nemec R, Obrycki L, Paglialonga F, Picca S, Samaille C, Shenoy M, Sinha MD, Spasojevic B, Stronach L, Vidal E, Vondrák K, Yilmaz A, Zaloszyc A, Fischbach M, Schmitt CP, Schaefer F. Effects of Hemodiafiltration versus Conventional Hemodialysis in Children with ESKD: The HDF, Heart and Height Study. J Am Soc Nephrol 2019; 30:678-691. [PMID: 30846560 DOI: 10.1681/asn.2018100990] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Accepted: 01/26/2019] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Hypertension and cardiovascular disease are common in children undergoing dialysis. Studies suggest that hemodiafiltration (HDF) may reduce cardiovascular mortality in adults, but data for children are scarce. METHODS The HDF, Heart and Height study is a nonrandomized observational study comparing outcomes on conventional hemodialysis (HD) versus postdilution online HDF in children. Primary outcome measures were annualized changes in carotid intima-media thickness (cIMT) SD score and height SD score. RESULTS We enrolled 190 children from 28 centers; 78 on HD and 55 on HDF completed 1-year follow-up. The groups were comparable for age, dialysis vintage, access type, dialysis frequency, blood flow, and residual renal function. At 1 year, cIMT SD score increased significantly in children on HD but remained static in the HDF cohort. On propensity score analysis, HD was associated with a +0.47 higher annualized cIMT SD score compared with HDF. Height SD score increased in HDF but remained static in HD. Mean arterial pressure SD score increased with HD only. Factors associated with higher cIMT and mean arterial pressure SD-scores were HD group, higher ultrafiltration rate, and higher β2-microglobulin. The HDF cohort had lower β2-microglobulin, parathyroid hormone, and high-sensitivity C-reactive protein at 1 year; fewer headaches, dizziness, or cramps; and shorter postdialysis recovery time. CONCLUSIONS HDF is associated with a lack of progression in vascular measures versus progression with HD, as well as an increase in height not seen in the HD cohort. Patient-related outcomes improved among children on HDF correlating with improved BP control and clearances. Confirmation through randomized trials is required.
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Affiliation(s)
- Rukshana Shroff
- Nephrology Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, United Kingdom and .,Vascular Physiology Unit, University College London Institute of Child Health, Gower Street, London, United Kingdom
| | - Colette Smith
- Statistics Department, Institute for Global Health, University College London, London, United Kingdom
| | - Bruno Ranchin
- Renal Unit, Hôpital Femme Mère Enfant, Hospices Civils de Lyon, Bron, France
| | | | | | - Varvara Askiti
- Nephrology Unit, Kyriakou Children's Hospital, Athens, Greece
| | - Karolis Azukaitis
- Nephrology Unit, Clinic of Pediatrics, Vilnius University, Vilnius, Lithuania
| | - Nur Canpolat
- Nephrology Unit, Cerrahpasa School of Medicine, Istanbul, Turkey
| | - Ayşe Ağbaş
- Nephrology Unit, Cerrahpasa School of Medicine, Istanbul, Turkey
| | - Helen Aitkenhead
- Nephrology Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, United Kingdom and
| | - Ali Anarat
- Nephrology Unit, Cukurova University, Adana, Turkey
| | - Bilal Aoun
- Nephrology Unit, Armand Trousseau Hospital, Paris, France
| | - Daley Aofolaju
- Nephrology Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, United Kingdom and
| | | | - Devina Bhowruth
- Vascular Physiology Unit, University College London Institute of Child Health, Gower Street, London, United Kingdom
| | | | | | - Rainer Büscher
- Nephrology Unit, University Children Hospital Essen, Essen, Germany
| | - John Deanfield
- Vascular Physiology Unit, University College London Institute of Child Health, Gower Street, London, United Kingdom
| | - Claire Dempster
- Nephrology Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, United Kingdom and
| | - Ali Duzova
- Nephrology Unit, Hacettepe University, Ankara, Turkey
| | - Sandra Habbig
- Nephrology Unit, University Hospital Cologne, Cologne, Germany
| | - Wesley Hayes
- Nephrology Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, United Kingdom and
| | - Shivram Hegde
- Nephrology Unit, University Hospital of Wales, Cardiff, United Kingdom
| | - Saoussen Krid
- Nephrology Unit, Hôpital Necker-Enfants Malades, Paris, France
| | - Christoph Licht
- Nephrology Unit, The Hospital for Sick Children, Toronto, Canada
| | - Mieczyslaw Litwin
- Nephrology Unit, Children's Memorial Health Institute, Warsaw, Poland
| | - Mark Mayes
- Nephrology Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, United Kingdom and
| | - Sevgi Mir
- Nephrology Unit, Ege University Faculty of Medicine, Izmir, Turkey
| | - Rose Nemec
- Nephrology Unit, The Hospital for Sick Children, Toronto, Canada
| | - Lukasz Obrycki
- Nephrology Unit, Children's Memorial Health Institute, Warsaw, Poland
| | - Fabio Paglialonga
- Nephrology Unit, Fondazione Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Stefano Picca
- Nephrology Unit, Bambino Gesù" Children Research Hospital, Rome, Italy
| | | | - Mohan Shenoy
- Nephrology Unit, Royal Manchester Children's Hospital, Manchester, United Kingdom
| | - Manish D Sinha
- Nephrology Unit, Kings College London, Evelina London Children's Hospital, London, United Kingdom
| | | | - Lynsey Stronach
- Nephrology Unit, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, United Kingdom and
| | - Enrico Vidal
- Nephrology Unit, Pediatric Dialysis and Transplant Unit, Padova, Italy
| | - Karel Vondrák
- Nephrology Unit, University Hospital Motol, Prague, Czech Republic
| | - Alev Yilmaz
- Nephrology Unit, Istanbul University Faculty of Medicine, Istanbul, Turkey
| | - Ariane Zaloszyc
- Nephrology Unit, Children's Dialysis Center, Strasbourg, France; and
| | - Michel Fischbach
- Nephrology Unit, Children's Dialysis Center, Strasbourg, France; and
| | - Claus Peter Schmitt
- Nephrology Unit, Center for Pediatrics and Adolescent Medicine, Heidelberg, Germany
| | - Franz Schaefer
- Nephrology Unit, Center for Pediatrics and Adolescent Medicine, Heidelberg, Germany
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Öberg CM, Martuseviciene G. Computer Simulations of Continuous Flow Peritoneal Dialysis Using the 3-Pore Model-A First Experience. Perit Dial Int 2019; 39:236-242. [PMID: 30846606 DOI: 10.3747/pdi.2018.00225] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 12/28/2018] [Indexed: 11/15/2022] Open
Abstract
Background:Continuous flow peritoneal dialysis (CFPD) is performed using a continuous flux of dialysis fluid via double or dual-lumen PD catheters, allowing a higher dialysate flow rate (DFR) than conventional treatments. While small clinical studies have revealed greatly improved clearances using CFPD, the inability to predict ultrafiltration (UF) may confer a risk of potentially harmful overfill. Here we performed physiological studies of CFPD in silico using the extended 3-pore model.Method:A 9-h CFPD session was simulated for: slow (dialysate to plasma creatinine [D/P crea] < 0.6), fast (D/P crea > 0.8) and average (0.6 ≤ D/P crea ≤ 0.8) transporters using 1.36%, 2.27%, or 3.86% glucose solutions. To avoid overfill, we applied a practical equation, based on the principle of mass-balance, to predict the UF rate during CFPD treatment.Results:Increasing DFR > 100 mL/min evoked substantial increments in small- and middle-molecule clearances, being 2 - 5 times higher compared with a 4-h continuous ambulatory PD (CAPD) exchange, with improvements typically being smaller for average and slow transporters. Improved UF rates, exceeding 10 mL/min, were achieved for all transport types. The β2-microglobulin clearance was strongly dependent on the UF rate and increased between 60% and 130% as a function of DFR. Lastly, we tested novel intermittent-continuous regimes as an alternative strategy to prevent overfill, being effective for 1.36% and 2.27%, but not for 3.86% glucose.Conclusion:While we find substantial increments in solute and water clearance with CFPD, previous studies have shown similar improvements using high-volume tidal automated PD (APD). Lastly, the current in silico results need confirmation by studies in vivo.
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Affiliation(s)
- Carl M Öberg
- Renal Physiology and Peritoneal Dialysis Group, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
| | - Giedre Martuseviciene
- Renal Physiology and Peritoneal Dialysis Group, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
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