ultrafiltration coefficient

ul·tra·fil·tra·tion co·ef·fi·cient

the filtration coefficient of a semipermeable membrane.
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All patients were dialysed with polysulfone membrane dialyzer Fresenius 4008H (Fresenius Medical Care, Germany): (1) 4 patients by low flux dialyzer F8 HPS with an effective membrane area of 1.8 [m.sup.2] and an ultrafiltration coefficient of 18 mL/h*mmHg; (2) one patient with a low flux membrane dialyzer F10 HPS with a membrane area of 2.2 [m.sup.2], ultrafiltration coefficient of 21 mL/h*mmHg; (3) 5 patients with high flux dialyzer FX 80 with effective membrane area of 1.8 [m.sup.2] and ultrafiltration coefficient of 59 mL/h*mmHg.
Since the diffusive transport is superior to the convective transport for small non-proteinbound solutes in the dialyzer during conventional hemodialysis, the transport of the studied non-protein-bound solutes in the LF and HF dialyzers was alike regardless of the HF having a higher ultrafiltration coefficient (59 mL/h*mmHg for HF vs 18 and 21 mL/h*mmHg for LF), and slightly higher average total ultrafiltration (UF) (1.95 [+ or -] 0.74 l for HF vs 1.57 [+ or -] 0.42 l for LF, ns) during the study.
As expected, the elimination of cystatin C during dialysis increased with the ultrafiltration coefficient (UFC) of the membrane, an estimate of the permeability: 0% (vs 40% for creatimime) for UFC <15 mL x [h.sup.-1] x [m.sup.2] x mmHg and ~60% (as for creatinine) for UFC >15 mL x [h.sup.-1] x [m.sup.2] x mmHg (10).
All patients were dialysed with polysulfone membrane dialysers (Fresenius Medical Care, Germany): (1) four patients with 12 treatments by low flux dialyser F8 HPS with an effective membrane area of 1.8 [m.sup.2] and an ultrafiltration coefficient of 18 mL/h*mmHg; (2) one patient with three treatments was dialysed with low flux membrane dialyser F10 HPS with membrane area 2.2 [m.sup.2], ultrafiltration coefficient of 21 mL/h*mmHg; (3) five patients on 15 sessions with high flux dialyser FX 80 with effective membrane area of 1.8 [m.sup.2] and ultrafiltration coefficient of 59 mL/h*mmHg.