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Comparison of changes in albumin binding capacity during hemodiafiltration or hemodialysis with middle cut off membranes

Background: Albumin is important for the transport of protein-bound substances (PBS). Albumin binding capacity (ABiC) is reduced in dialysis patients. This can contribute to worsening of uremic symptoms. It is presumed that open-porous middle cut off filters that is, HDx (Baxter-Theranova) remove high molecular substances more efficiently than conventional treatment. To evaluate HDx for the improvement of ABiC and removal of PBS, HDx was compared to hemodiafiltration (Fresenius-FX80, HDF). Methods: We included 32 chronic patients on HDF. After inclusion patients were treated with HDx for 14 days. Blood samples were drawn before/after treatments at study entry, first HDx and sixth HDx, to determine ABiC and other study parameters. Results: ABiC improved in HDx (68.4% vs 72.4%) and HDF (69.9% vs 72.4%) without differences between both therapies. No reduction of albumin concentration during HDx treatment was observed. Conclusion: HDx is accepted as a safe and equally efficient therapy for removing albumin bound uremic toxins compared to HDF with high flux dialyzers.