Continuous arterovenous hemofiltration (CAVH) is similar to SCUF except that ultrafiltration is allowed at a greater degree than required for the restoration of euvolemia; that increases solute removal. Replacement fluid is required to prevent volume depletion. Solute clearance is directly related to UFR. Predilution replacing fluid before the filter will help to increase the removal of urea by diluting and lowering plasma urea concentration, allowing urea to diffuse from within red cells into plasma water
Despite the routine use of less expensive, commercially prepared peritoneal dialysate, it is this component of the hemofiltration procedure that is responsible for the relatively increased cost in comparison to continuous arteriovenous hemofiltration