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Journal Article
Review
Reconsidering adsorption in hemodialysis: is it just an epiphenomenon? A narrative review.
Journal of Nephrology 2022 January
Since the first attempt at extracorporeal renal replacement therapy, renal replacement therapy has been constantly improved. In the field of hemodialysis, substantial efforts have been made to improve toxin removal and biocompatibility. The advent of hemodiafiltration (HDF) and, more recently, of mid cut-off membranes have contributed to management of patients with end-stage renal disease (ESRD). Although several uremic toxins have been discovered, we know little about the clinical impact of their clearance in hemodialysis patients. In addition, a great deal of progress has been made in the areas of filtration and diffusion, but the adsorptive properties of hemodialysis membranes remain under-studied. The mechanism of action of adsorption is based on the attraction between the polymer of the dialysis membrane and the solutes, through hydrophobic interactions, ionic or electrostatic forces, hydrogen bonds or van der Waals forces. Adsorption on the dialysis membrane depends on the membrane surface, pore size, structure and electric load. Its involvement in toxin removal and biocompatibility is significant, and is not just an epiphenomenon. Diffusive and convective properties cannot be improved indefinitely and high permeability membranes, despite their high performance in the clearance of many toxins, have several limitations for long-term use in hemodialysis. This review will discuss why adsorption should be reconsidered and better characterized to improve efficiency and adequacy of dialysis.
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