The hemisoma in which the bioelectrical impedance vector analysis is performed has no influence on outcomes in patients receiving intravenous fluid therapy.

INTRODUCTION

This study investigates the concordance of bioelectrical impedance vector analysis (BIVA) measurements in both hemisomes in patients receiving fluid therapy, since clinical practice suggests performing them in the hemisoma contralateral to that of its administration to avoid interferences. The primary objective of this study was to evaluate the concordance of phase angle (PhA), resistance and reactance, both standardized by height (Rz/h, Xc/h) between the hemisoma where the patient is receiving iv fluids and the other one.

METHODS

Clinical, prospective and descriptive study, which included 100 hospitalized patients with total parenteral nutrition (TPN) or other intravenous fluid therapy. BIVA measurements were taken in both hemisomes and analyzed by means of Bland-Altman plots, Passing-Block test and conditional method agreement trees (COAT).

RESULTS

100 patients were included (57 men and 43 women), with an average age of 67.2±15.1 years. Univariate analysis using the Bland-Altman plot showed no concordance of PhA, Rz/h and Xc/h between both hemisomes in patients who received fluid therapy, but Passing-Block test showed no systematic or proportional differences between hemisomas and multivariate COAT analysis did not show that the specified covariates affected concordance.

CONCLUSIONS

No systematic or proportional differences between hemisomas in resistance and reactance has been demonstrated, suggesting the possibility of being able to perform the measurement independently of the side of fluid administration.