CAVH can be applied for 24 hours per day for several days. In
addition, small-size haemofilters are used (hollow fibre membranes
with a surface area of 0.2–0.5 m2). These have a high
hydraulic permeability coefficient and give a convective clearance
of the extracorporeal blood circuit without a blood
pump. However, fluid substitution and the continuous infusion
of heparin at a rate of 10 IU/kg/h are required. The blood flows