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High-flux synthetic versus cellulosic membranes for beta 2-microglobulin removal during hemodialysis,
J Floege1, C Granolleras, G Deschodt
1Department of Nephrology, Medizinische Hochschule Hannover, FRG.
Abstract:
Efficient removal of beta 2 microglobulin (beta 2-M) in end-stage renal failure patients is a continuing preoccupation, as the incidence and severity of dialysis-associated amyloidosis are increasing. To evaluate comparative beta 2-M removal we studied six stable end-stage renal failure patients during high-flux 3-h haemodialysis, haemodia-filtration, and haemofiltration, using acrylonitrile, cellulose triacetate, polyamide and polysulphone capillary devices. The reduction of plasma beta 2-M, total removal in ultrafiltrate/dialysate, and beta 2-M sieving coefficients were measured by RIA. The results suggest that convection plays the major role in beta 2-M removal when high-flux synthetic membranes are used in combination with high blood flow rates. In contrast, using the cellulose triacetate membrane under investigation, beta 2-M removal is diminished when ultrafiltration rates are increased. Accordingly, in any future prospective study on the role of beta 2-M retention in the amyloidogenesis, it is recommended that high-flux synthetic membranes be employed rather than the type of high-flux cellulosic membranes used in this study. The modality with which these synthetic membranes are used is probably less important, as long as maximum convective transport rates are obtained. Under present conditions, this will imply haemofiltration or haemodiafiltration rather than haemodialysis.
Insights
Efficient removal of beta 2 microglobulin (beta 2-M) is crucial for end-stage renal failure patients. High-flux synthetic membranes combined with high convective transport rates, such as in hemofiltration, are recommended for optimal beta 2-M removal.
Area of Science:
- Nephrology
- Biomedical Engineering
- Materials Science
Background:
- Dialysis-associated amyloidosis is a growing concern in end-stage renal failure patients.
- Efficient removal of beta 2 microglobulin (beta 2-M) is essential for managing this complication.
Purpose of the Study:
- To compare the efficacy of different dialysis modalities and membrane types in removing beta 2-M.
- To identify optimal strategies for reducing beta 2-M levels in hemodialysis patients.
Main Methods:
- Six stable end-stage renal failure patients underwent 3-hour treatments using high-flux hemodialysis, hemodiafiltration, and hemofiltration.
- Acrylonitrile, cellulose triacetate, polyamide, and polysulfone capillary devices were evaluated.
- Plasma beta 2-M reduction, total removal in ultrafiltrate/dialysate, and sieving coefficients were measured using RIA.
Main Results:
- Convection significantly enhances beta 2-M removal with high-flux synthetic membranes and high blood flow rates.
- Beta 2-M removal decreased with increased ultrafiltration rates when using cellulose triacetate membranes.
- Hemofiltration and hemodiafiltration achieved maximum convective transport rates.
Conclusions:
- High-flux synthetic membranes are recommended over high-flux cellulosic membranes for beta 2-M removal in future studies.
- Maximizing convective transport, likely through hemofiltration or hemodiafiltration, is key for effective beta 2-M reduction.