Fluid Volume Estimation by Bioimpedance: Methodological Caveats and Clinical Interpretation.

ABSTRACT:

Background

Fluid monitoring is critical for patients on maintenance hemodialysis. Bioimpedance enables estimation of fluid volumes from measures of electrical tissue properties. However, empirical equations are needed to approximate key variables, especially in wrist-to-ankle bioimpedance measurements, introducing potential errors.

Summary

Here, we provide a technical overview of electrical impedance, derivation of fluid volumes from different bioimpedance methods and electrode setups, as well as sources of error including the assumption of constant resistivity, constant body temperature, and vendor-specific equations to derive fluid overload. We summarize the validity of bioimpedance methods in hemodialysis and conclude that irrespective of error sources reported above, seg

SUBMITTER: Mussnig S 

PROVIDER: S-EPMC12700587 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature