Table 1.

Determination of total effluent rate among RRT modalities

CVVH

Total effluent rate = total UF rate (sum of pre-filter and post-filter replacement fluid rate, ml/h) + fluid removal rate (ml/h)

CVVHD

Total effluent rate = dialysate rate (ml/h) + fluid removal rate (ml/h)

CVVHDF

Total effluent rate = total UF rate (sum of pre-filter and post-filter replacement fluid rate, ml/h) + dialysate rate (ml/h) + fluid removal rate (ml/h)

Dilution factor for pre-dilution

Plasma flow rate (ml/h)/[plasma flow rate (ml/h) + pre-filter replacement fluid rate (ml/h)]

Plasma flow rate (ml/h) = blood flow rate (ml/min) × 60 (min/h) x (1 – HCT)

RRT renal replacement therapy, CVVH continuous venovenous hemofiltration, CVVHD continuous venovenous hemodialysis, CVVHDF continuous venovenous hemodiafiltration, UF ultrafiltration, HCT current patient hematocrit