Precision of Ultrafiltration
UF precision measurements were obtained from all 62 control patients and 21 of the 35 intervention patients. The lack of data for 14 intervention patients was for a variety of reasons, mainly technical difficulties in establishing or sustaining RRT or in measuring UF: see (Histogram of ultrafiltration precision, showing the rate achieved versus the rate prescribed. For NIDUS and CVVH devices, another important measure was to compare the difference between the actual fluid removal rate and that displayed by the device. This had a mean closer to zero for NIDUS than CVVH (means, –0.4 vs 11.6 mL/hr), with less variation in NIDUS than CVVH (