The HEMO study revealed that β2-microglobulin clearance decreases over time with Renalin reuse in the high-flux group. It was suggested that the reuse of polysulfone or cellulose triacetate high-flux dialyzers with Renalin (without bleach) results in degradation of the high-flux capacity. At our haemodialysis unit (Vila Real, Portugal) we reused dialyzers until January 2000 (limited to 10 reuses), with an automatic machine Renatron® (Renal Systems, Minntech®). All of our 31 patients who started with postdilution haemodiafiltration on-line (HDFol) were always dialyzed with F-80 polysulfone (Fresenius®). The reposition rate was 10 litres/session until 1998 and 20 litres/session thereafter. Reuse techniques were abandoned in our country in January 2000 following an EEC directive. Thereafter, we have decided to maintain HDFol with the same dialyzers without reuse. The mean β2-microglobulin predialysis values did not decrease over time until reuse was terminated (1995 with low-flux haemodialysis: 25.4 ± 6.4 µg/l; 1997: 24.7 ± 6.6 µg/l; 1998: 29.2 ± 8.9 µg/l; 1999: 33.7 ± 4.7 µg/l) whereas β2-microglobulin clearances were reasonable with HDFol (1998: 56.4 ± 25.9 ml/min; 1999: 47.9 ± 16.4 ml/min). After stopping reuse we have noticed that predialysis β2-microglobulin values decreased (2000: 23.0 ± 3.9 µg/l) in accordance with β2-microglobulin clearance duplication (2000: 84.1 ± 25.0 ml/min; p < 0.01). It is our opinion that the reuse of polysulfone dialyzers with Renalin should be abandoned in the field of high-flux haemodialysis. It causes deterioration in the β2-microglobulin clearance and probably interferes with the high-flux haemodialysis benefits, namely the reduction of dialysis-related amyloidosis.

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