Nephrol Dial Transplant (2004) 19: 293-296
© ERAEDTA 2004; all rights reserved
Editorial Comments
Which dialyser membrane to choose?
University Hospital Ghent, Department of Internal Medicine, Nephrology Division, Ghent, Belgium
Correspondence and offprint requests to: Raymond Vanholder, University Hospital Ghent, Department of Internal Medicine, Nephrology Division, De Pintelaan 185, B-9000 Ghent, Belgium. Email: raymond.vanholder@ugent.be
Keywords: bioincompatible; cellulose; dialyser; high-flux; low-flux; synthetic
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Introduction
Exchanges through dialyser membranes aim: (i) at the removal of uraemic solutes that are retained because of renal failure (e.g. urea) and (ii) at the restoration of depleted compounds (e.g. bicarbonate).
The originally used cellulosic membranes were derived from cotton and therefore named natural. They activated complement and leukocytes, inducing an inflammatory reaction as one of the indices of bioincompatibility [1]. Later on, chemically developed synthetic polymers appeared to mitigate this activation [2]. Furthermore, masking hydroxyl groups, which are responsible for the complement activation with cellulosic membranes, also resulted in more biocompatibility [3]. Therefore, cuprophan and its analogues were called unmodified cellulosic vs the more biocompatible, later developed modified/regenerated cellulosic membranes.
Many synthetic membranes have large pore sizes allowing higher rates of water flux and permitting a higher ultrafiltration
Relevant membrane characteristics
Biocompatibility towards leukocytes and the complement system
Impermeability against dialysate impurities
Adsorption
Pore size
Summary
Clinical consequences
Conclusion
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