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Ranchin B, Schmitt CP, Warady BA, Hataya H, Jones J, Lalji R, Licht C, Mosca M, Stronach L, Vidal E, Walle JV, Shroff R. Technical requirements and devices available for long-term hemodialysis in children-mind the gap! Pediatr Nephrol 2024; 39:2579-2591. [PMID: 38141144 DOI: 10.1007/s00467-023-06233-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 11/10/2023] [Accepted: 11/13/2023] [Indexed: 12/24/2023]
Abstract
Children requiring long-term kidney replacement therapy are a "rare disease" cohort. While the basic technical requirements for hemodialysis (HD) are similar in children and adults, key aspects of the child's cardiovascular anatomy and hemodynamic specifications must be considered. In this article, we describe the technical requirements for long-term HD therapy for children and the devices that are currently available around the world. We highlight the characteristics and major technical shortcomings of permanent central venous catheters, dialyzers, dialysis machines, and software available to clinicians who care for children. We show that currently available HD machines are not equipped with appropriately small circuits and sensitive control mechanisms to perform safe and effective HD in the youngest patients. Manufacturers limit their liability, and health regulatory agencies permit the use of devices, only in children according to the manufacturers' pre-specified weight limitations. Although registries show that 6-23% of children starting long-term HD weigh less than 15 kg, currently, there is only one long-term HD device that is cleared for use in children weighing 10 to 15 kg and none is available and labelled for use in children weighing less than 10 kg anywhere in the world. Thus, many children are being treated "off-label" and are subject to interventions delivered by medical devices that lack pediatric safety and efficacy data. Moreover, recent improvements in dialysis technology offered to adult patients are denied to most children. We, in turn, advocate for concerted action by pediatric nephrologists, industry, and health regulatory agencies to increase the development of dedicated HD machines and equipment for children.
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Affiliation(s)
- Bruno Ranchin
- Pediatric Nephrology Unit, Hôpital Femme Mère Enfant, Hospices Civils de Lyon, Université de Lyon, Lyon, France.
- Centre de référence des maladies rénales rares, Hôpital Femme Mère Enfant, Hospices Civils de Lyon, 59 boulevard Pinel, 69677, Bron Cedex, France.
| | - Claus Peter Schmitt
- Pediatric Nephrology, Center for Pediatrics and Adolescent Medicine, University of Heidelberg, Heidelberg, Germany
| | - Bradley A Warady
- Division of Nephrology, Department of Pediatrics, Children's Mercy Kansas City, Kansas City, MO, USA
| | - Hiroshi Hataya
- Department of Nephrology, Tokyo Metropolitan Children's Medical Center, Fuchu, Japan
- Department of Pediatrics, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan
| | - Joanne Jones
- Queensland Children's Hospital, University of Queensland, Brisbane, Australia
| | - Rowena Lalji
- Centre for Kidney Disease Research, University of Queensland, Brisbane, Australia
- Department of Nephrology, Queensland Children's Hospital, Brisbane, Australia
- Metro South and Integrated Nephrology and Transplant Services, Princess Alexandra Hospital, Brisbane, Australia
| | - Christoph Licht
- Department of Pediatrics, University of Toronto, Toronto, ON, Canada
- Division of Nephrology and Research Institute, Cell Biology Program, The Hospital for Sick Children, Toronto, ON, Canada
| | - Melodie Mosca
- Pediatric Nephrology Unit, Hôpital Femme Mère Enfant, Hospices Civils de Lyon, Université de Lyon, Lyon, France
| | - Lynsey Stronach
- University College London Great Ormond Street Hospital and Institute of Child Health, London, UK
| | - Enrico Vidal
- Pediatric Nephrology Unit, Department for Woman and Child's Health, University-Hospital of Padua, Padua, Italy
| | - Johan Vande Walle
- Department of Pediatric Nephrology, Ghent University Hospital, Ghent, Belgium
| | - Rukshana Shroff
- University College London Great Ormond Street Hospital and Institute of Child Health, London, UK
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Dimski T, Brandenburger T, Vollmer C, Kindgen-Milles D. A safe and effective protocol for postdilution hemofiltration with regional citrate anticoagulation. BMC Nephrol 2024; 25:218. [PMID: 38982339 PMCID: PMC11234626 DOI: 10.1186/s12882-024-03659-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: 04/16/2024] [Accepted: 07/01/2024] [Indexed: 07/11/2024] Open
Abstract
BACKGROUND Regional citrate anticoagulation (RCA) is recommended during continuous renal replacement therapy. Compared to systemic anticoagulation, RCA provides a longer filter lifespan with the risk of metabolic alkalosis and impaired calcium homeostasis. Surprisingly, most RCA protocols are designed for continuous veno-venous hemodialysis or hemodiafiltration. Effective protocols for continuous veno-venous hemofiltration (CVVH) are rare, although CVVH is a standard treatment for high-molecular-weight clearance. Therefore, we evaluated a new RCA protocol for postdilution CVVH. METHODS This is a monocentric prospective interventional study to evaluate a new RCA protocol for postdilution CVVH. We recruited surgical patients with stage III acute kidney injury who needed renal replacement therapy. We recorded dialysis and RCA data and hemodynamic and laboratory parameters during treatment sessions of 72 h. The primary endpoint was filter patency at 72 h. The major safety parameters were metabolic alkalosis and severe hypocalcemia at any time. RESULTS We included 38 patients who underwent 66 treatment sessions. The mean filter lifespan was 66 ± 12 h, and 44 of 66 (66%) filters were patent at 72 h. After censoring for non-CVVH-related cessation of treatment, 83% of all filters were patent at 72 h. The delivered dialysis dose was 28 ± 5 ml/kgBW/h. The serum levels of creatinine, urea and beta2-microglobulin decreased significantly from day 0 to day 3. Metabolic alkalosis occurred in one patient. An iCa++ below 1.0 mmol/L occurred in four patients. Citrate accumulation did not occur. CONCLUSIONS We describe a safe, effective, and easy-to-use RCA protocol for postdilution CVVH. This protocol provides a long and sustained filter lifespan without serious adverse effects. The risk of metabolic alkalosis and hypocalcemia is low. Using this protocol, a recommended dialysis dose can be safely administered with effective clearance of low- and middle-molecular-weight molecules. TRIAL REGISTRATION The study was approved by the medical ethics committee of Heinrich-Heine University Duesseldorf (No. 2018-82KFogU). The trial was registered in the local study register of the university (No: 2018044660) on 07/04/2018 and was retrospectively registered at ClinicalTrials.gov (ClinicalTrials.gov Identifier: NCT03969966) on 31/05/2019.
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Affiliation(s)
- Thomas Dimski
- Department of Anesthesiology, University Hospital Duesseldorf, Heinrich-Heine University Duesseldorf, Moorenstr. 5, Duesseldorf, 40225, Germany.
| | - Timo Brandenburger
- Department of Anesthesiology, University Hospital Duesseldorf, Heinrich-Heine University Duesseldorf, Moorenstr. 5, Duesseldorf, 40225, Germany
| | - Christian Vollmer
- Department of Anesthesiology, University Hospital Duesseldorf, Heinrich-Heine University Duesseldorf, Moorenstr. 5, Duesseldorf, 40225, Germany
| | - Detlef Kindgen-Milles
- Department of Anesthesiology, University Hospital Duesseldorf, Heinrich-Heine University Duesseldorf, Moorenstr. 5, Duesseldorf, 40225, Germany
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Maduell F, Rodríguez-Espinosa D, Rodas LM, Gómez M, Arias-Guillén M, Fontseré N, Vera M, Del Carmen Salgado M, Rico N, Broseta JJ. Most recently developed polyester polymer alloy dialyzer: A new medium cut-off membrane? Artif Organs 2024; 48:753-762. [PMID: 38404240 DOI: 10.1111/aor.14726] [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: 11/28/2023] [Revised: 01/28/2024] [Accepted: 02/02/2024] [Indexed: 02/27/2024]
Abstract
BACKGROUND New versions of the polyester polymer alloy (PEPA) membrane have appeared over the years, with increases in both the pore size and the amount of polyvinylpyrrolidone (PVP) to optimize hydrophilicity performance. This study aimed to assess the efficacy of the most recently developed PEPA dialyzer, the FDY series, in hemodialysis (HD) modality in terms of uremic toxin removal and albumin loss and to compare it with that of several high-flux dialyzers currently used in HD and post-dilution hemodiafiltration (HDF) treatments. METHODS A prospective study was carried out in 21 patients. All patients underwent six dialysis sessions with the same routine dialysis parameters; only the dialyzer and/or the dialysis modality varied: FX80 in HD, FDY 180 in HD, Clearum HS17 in HDF, Elisio 19H in HDF, Vitapes 180 in HDF, and FX80 in post-dilution HDF. The reduction ratios (RR) of urea, creatinine, ß2-microglobulin, myoglobin, κFLC, prolactin, α1-microglobulin, α1-acid glycoprotein, λFLC, and albumin were compared intraindividually. Dialysate albumin loss was also measured. RESULTS Both membranes FDY and FX80 are high-flux dialyzers and are applied here in high-flux HD. The average RR of β2-microglobulin was slightly lower in the two HD treatments than in the HDF treatments. Comparison of dialysis treatments revealed that the PEPA FDY dialyzer in the HD modality was more effective than the FX80 dialyzer in high-flux HD and was as effective as post-dilution HDF, especially in terms of myoglobin, κFLC, prolactin, α1-microglobulin, and λFLC RRs. The FDY treatments obtained similar albumin RR in blood and slightly higher dialysate albumin loss, although the values were clinically acceptable. CONCLUSIONS The most recently developed PEPA dialyzers in the HD modality were as effective as all treatments in the HDF modality and were clearly superior to high-flux helixone HD treatment. These results confirm that this dialyzer should be categorized within the medium cut-off (MCO) membrane classification.
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Affiliation(s)
- Francisco Maduell
- Department of Nephrology, Hospital Clínic Barcelona, Barcelona, Spain
- Department of Medicine, University of Barcelona, Barcelona, Spain
| | | | - Lida María Rodas
- Department of Nephrology, Hospital Clínic Barcelona, Barcelona, Spain
| | - Miquel Gómez
- Department of Nephrology, Hospital Clínic Barcelona, Barcelona, Spain
| | | | - Néstor Fontseré
- Department of Nephrology, Hospital Clínic Barcelona, Barcelona, Spain
| | - Manel Vera
- Department of Nephrology, Hospital Clínic Barcelona, Barcelona, Spain
| | | | - Nayra Rico
- Department of Biochemistry, Hospital Clínic Barcelona, Barcelona, Spain
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Maduell F, Broseta JJ, Rodríguez-Espinosa D, Rodas LM, Gómez M, Arias-Guillén M, Fontseré N, Vera M, Salgado MDC, Rico N, Ramos R. Comparison of efficacy and safety of the new generation helixone dialyzers. Nefrologia 2024; 44:354-361. [PMID: 38679516 DOI: 10.1016/j.nefroe.2024.04.005] [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: 01/05/2024] [Accepted: 02/27/2024] [Indexed: 05/01/2024] Open
Abstract
INTRODUCTION New generation helixone dialyzers has recently been developed as part of the ongoing effort to improve dialyzer hemocompatibility and avoid adverse reactions to synthetic dialyzers. This study aimed to assess the performance and albumin loss of this new dialyzer series in hemodiafiltration and compare it with the previous generation helixone series. MATERIAL AND METHODS A prospective study was conducted in 19 patients. Each patient underwent eight dialysis sessions with the same routine dialysis parameters; only the dialyzer varied: FX60 CorDiax, FX CorAL 60, FX600 CorDiax, FX CorAL 600, FX80 CorDiax, FX CorAL 80, FX800 CorDiax, and FX CorAL 800. The reduction ratios (RR) of urea, creatinine, ß2-microglobulin, myoglobin, kappa-free immunoglobulin light chains (κFLC), prolactin, α1-microglobulin, α1-acid glycoprotein, lambda immunoglobulin light chains (λFLC), and albumin were compared intra-individually. Dialysate albumin loss was also measured. RESULTS All treatments were well tolerated. The mean amount of replacement fluid ranged from 31 to 34 L. Comparison of dialysis treatments showed no differences between small molecules and even up to those the size of β2-microglobulins. Little differences were found between myoglobin, κFLC, prolactin, α1-microglobulin, and λFLC RRs, and only FX80 CorDiax was slightly superior to the others. Mean dialysate albumin losses were similar, with less than 2.5 g lost in each dialyzer. The FX80 CorDiax showed slightly higher global removal scores than the other dialyzers evaluated, except for FX CorAL 800. CONCLUSION The new generation helixone dialyzers series has been updated to minimise the risk of adverse reactions, while maintaining the effectiveness and albumin loss achieved by the previous most advanced helixone generation.
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Affiliation(s)
- Francisco Maduell
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain.
| | - José Jesús Broseta
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
| | | | - Lida María Rodas
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
| | - Miquel Gómez
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
| | - Marta Arias-Guillén
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
| | - Néstor Fontseré
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
| | - Manel Vera
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
| | | | - Nayra Rico
- Servicio de Bioquímica, Hospital Clínic, Barcelona, Spain
| | - Rosa Ramos
- Servicio de Nefrología y Trasplante Renal, Hospital Clínic, Barcelona, Spain
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Maduell F, Rodríguez-Espinosa D, Broseta JJ. Latest Trends in Hemodiafiltration. J Clin Med 2024; 13:1110. [PMID: 38398423 PMCID: PMC10888566 DOI: 10.3390/jcm13041110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 02/07/2024] [Accepted: 02/14/2024] [Indexed: 02/25/2024] Open
Abstract
This review provides a detailed analysis of hemodiafiltration (HDF), its progress from an emerging technique to a potential conventional treatment for chronic hemodialysis patients, and its current status. The article covers the advances, methods, and clinical benefits of HDF, specifically focusing on its impact on cardiovascular health, survival rates, and overall well-being. The review also addresses questions about the safety of HDF and provides evidence to dispel concerns related to the elimination of beneficial substances and infection risks. Additionally, the article explores the potential implications of expanded hemodialysis (HDx) as an alternative to HDF, its classification, safety profile, and an ongoing trial assessing its non-inferiority to HDF. Supported by evidence from randomized controlled trials and observational studies, the review emphasizes the superiority of HDF as a hemodialysis modality and advocates for its positioning as the gold standard in treatment. However, it acknowledges the need for extensive research to define the role of HDx in comprehensive treatment approaches in individuals undergoing dialysis. The synthesis of current knowledge underscores the importance of ongoing exploration and research to refine hemodialysis practices for optimal patient outcomes.
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Affiliation(s)
- Francisco Maduell
- Department of Nephrology, Hospital Clínic, 08036 Barcelona, Spain; (D.R.-E.); (J.J.B.)
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Ramírez-Guerrero G, Reis T, Marcello M, de Cal M, Ronco C. Crush syndrome-related acute kidney injury in earthquake victims, time to consider new therapeutical options? Int J Artif Organs 2024; 47:3-7. [PMID: 37589299 DOI: 10.1177/03913988231191954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Affiliation(s)
- Gonzalo Ramírez-Guerrero
- Critical Care Unit, Carlos Van Buren Hospital, Valparaíso, Valparaiso Region, Chile
- Dialysis and Renal Transplant Unit, Carlos Van Buren Hospital, Valparaíso, Valparaiso Region, Chile
- Department of Medicine, Universidad de Valparaíso, Valparaíso, Valparaiso Region, Chile
| | - Thiago Reis
- Deparment of Nephrology and Kidney Transplantation, Fenix Group, Sao Paulo, Brazil
- Laboratory of Molecular Pharmacology, University of Brasília, Brasília, Brazil
| | - Matteo Marcello
- International Renal Research Institute of Vicenza, (IRRIV Foundation), Department of Nephrology, Dialysis and Kidney Transplantation, San Bortolo Hospital, Vicenza, Italy
| | - Massimo de Cal
- International Renal Research Institute of Vicenza, (IRRIV Foundation), Department of Nephrology, Dialysis and Kidney Transplantation, San Bortolo Hospital, Vicenza, Italy
| | - Claudio Ronco
- International Renal Research Institute of Vicenza, (IRRIV Foundation), Department of Nephrology, Dialysis and Kidney Transplantation, San Bortolo Hospital, Vicenza, Italy
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Fiorentino M, La Fergola F, De Rosa S. Medium cut-off dialyzer for middle molecular uremic toxins in AKI and chronic dialysis. J Nephrol 2024; 37:23-37. [PMID: 37843731 PMCID: PMC10920419 DOI: 10.1007/s40620-023-01771-0] [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: 04/11/2023] [Accepted: 08/18/2023] [Indexed: 10/17/2023]
Abstract
Uremic toxins accumulate in patients affected by renal failure and can deposit in different organs, including the kidneys and heart. Given their physicochemical characteristics, uremic toxins can contribute to organ dysfunction due to several pathobiological actions at cellular and molecular levels. Several uremic compounds have been described in serum and plasma from patients with acute kidney injury (AKI) and kidney failure; they are usually classified based on their molecular size and protein-binding properties. In this scenario, new dialytic approaches have been proposed in the last few years with the aim of improving uremic toxin removal. Recent studies which focused on the use of medium cut-off membranes in patients on chronic hemodialysis have shown a discrete ability to remove β2-microglobulin and other middle molecules, such as kappa and lambda free light chains, complement factor D and α1-microglobulin. However, current evidence is mainly based on the impact on short-term outcomes and, consequently, longer observational studies are necessary to confirm the efficacy and safety of the medium cut-off dialyzer. Here we present the state-of-the-art on the clinical application of medium cut-off membranes in AKI and chronic dialysis patients.
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Affiliation(s)
- Marco Fiorentino
- Nephrology, Dialysis and Transplantation Unit, Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Bari, Italy
| | - Francesco La Fergola
- Nephrology, Dialysis and Transplantation Unit, Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Bari, Italy
| | - Silvia De Rosa
- Centre for Medical Sciences - CISMed, University of Trento, Via S. Maria Maddalena 1, 38122, Trento, Italy.
- Anesthesia and Intensive Care, Santa Chiara Regional Hospital, APSS Trento, Trento, Italy.
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Li Y, Luo X, Yang M, Su B. Alleviation of Oxidative Stress during Hemodialysis Sessions by Hemodialysis Membrane Innovation: A Multidisciplinary Perspective. Blood Purif 2023; 52:905-916. [PMID: 37748453 DOI: 10.1159/000533656] [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: 04/23/2023] [Accepted: 08/11/2023] [Indexed: 09/27/2023]
Abstract
Oxidative stress is prevalent in end-stage kidney disease patients receiving chronic hemodialysis and is associated with heavy cardiovascular disease burdens and increased mortality risks. Hemoincompatible hemodialysis membranes per se contribute to the activation of oxidative reactions and the generation of oxygen free radicals. Since the early 1990s, vitamin E-coated membranes have been extensively used in hemodialysis patients to reduce oxidative stress during hemodialysis sessions. However, the beneficial effects of vitamin E-coated membranes versus unmodified synthetic membranes on long-term patient-centered outcomes, such as survival, quality of life, and prevalence of cardiovascular diseases, remain controversial. Accordingly, novel antioxidant hemodialysis membranes were prepared to replace the use of vitamin E-coated membranes despite the translational research on these membranes unfortunately coming to a standstill. In this review, we first summarize the state-of-the-art on the use of vitamin E-coated membranes in hemodialysis patients to highlight their strengths and limitations. Then, we discuss the latest advances in fabricating antioxidant hemodialysis membranes and provide perspectives to bridge knowledge gaps between laboratorial investigations and clinical practice in fabricating antioxidant hemodialysis membranes.
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Affiliation(s)
- Yupei Li
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, China,
| | - Xinyao Luo
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, China
| | - Mei Yang
- General Practice Ward/International Medical Center Ward, General Practice Medical Center, West China Hospital, Sichuan University, Chengdu, China
- Department of Nephrology, The First People's Hospital of Shuangliu District, Chengdu, China
| | - Baihai Su
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, China
- Med-X Center for Materials, Sichuan University, Chengdu, China
- Med+ Biomaterial Institute of West China Hospital, Sichuan University, Chengdu, China
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9
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Affiliation(s)
- Thomas A Golper
- From Robert Larner College of Medicine, University of Vermont, Burlington, and Vanderbilt University Medical Center, Nashville (professor emeritus)
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García-Prieto A, de la Flor JC, Coll E, Iglesias E, Reque J, Valga F. Expanded hemodialysis: what's up, Doc? Clin Kidney J 2023; 16:1071-1080. [PMID: 37398691 PMCID: PMC10310509 DOI: 10.1093/ckj/sfad033] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Indexed: 10/06/2023] Open
Abstract
In recent years there has been an increasing interest in expanded hemodialysis (HDx), an emerging renal replacement therapy based on the use of medium cut-off membranes (MCO). Thanks to the internal architecture of these types of membranes, with a higher pore size and smaller fiber inner diameter to favor internal filtration rate, they can increase the removal of larger middle molecules in conventional hemodialysis. Secondarily, several reports suggest that this therapy potentially improve the outcomes for end-stage renal disease patients. However, HDx has not been defined yet and the characteristics of MCO membranes are not well stablished. The aim of this narrative review is to define HDx and summarize the dialyzers that have been used so far to perform this therapy, collect the evidence available on its efficacy and clinical outcomes compared with other hemodialysis techniques and settle the bases for its optimal prescription.
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Affiliation(s)
- Ana García-Prieto
- Nephrology Department, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | | | - Elisabet Coll
- Nephrology Department, Fundación Puigvert, Barcelona, Spain
| | - Elena Iglesias
- Nephrology Department, Complejo Hospitalario Universitario de Orense, Ourense, Spain
| | - Javier Reque
- Nephrology Department, Hospital General Universitario de Castellón, Castellón, Spain
| | - Francisco Valga
- Nephrology Department, Hospital Universitario de Gran Canaria Doctor Negrín, Las Palmas de Gran Canaria, Spain
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