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

Ultrafiltration and Convection are decreased by;
• A decrease in the positive pressure on the blood side of the
circuit. This can be due to either a decrease in blood flow
rate or a decrease in the rate of pre-dilution replacement
fluid.
• A decrease in negative pressure on the ultrafiltrate side
caused by a decrease in the flow rate of the ultrafiltrate
pump. [Hawkins, 2003]
In summary, the following table gives a diagrammatic
representation of the changes that occur with manipulation of
the principles of CRRT.
Rate of
blood flow
Rate of
dialysate
or UF flow
Diffusion
Increased
Diffusion
Decreased
Convection &
Ultrafiltrate
Increased
Convection &
Ultrafiltrate
Decreased
20