A quick reference guide to haemofiltration and renal failure March ...

Predilution or Postdilution???
The concept of replacing fluids, whether before or after the
haemofilter achieve the same goals - replacing lost volume and
replacement of electrolytes. However, predilution provides the
added benefit of a continuous flush for the haemofilter, and in
effect dilutes the blood flowing through it (Dirkes 2000:585)
This method may reduce the incidence of clotting in the
haemofilter but will reduce solute clearance due to
haemodiltution (Cole, L. June 4 2004).
Predilution Postdilution
R R
V + pump V V + pump V
UF UF
V – vein, R- replacement fluid, UF – ultra filtrate.
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