Diameter of inferior caval vein (VCD) and bioelectrical impedance analysis (BIA) for the analysis of hydration status in patients on hemodialysis.

Abstract

BIA can replace VCD only in major underhydration (VCD < 6.5 mm/m2). Fluid loss during hemodialysis is caused by a decrease of ECW, compatible with the postulation that excess fluid volume is carried by the extracellular compartment.