Bioelectrical impedance spectroscopy to estimate f

Authors: Antoine Dewitte Pauline Carles Olivier JoannèsBoyau Catherine Fleureau Hadrien Roze Christian Combe Alexandre Ouattara

Publish Date: 2015/05/29

Volume: 30, Issue: 2, Pages: 227-233

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Abstract

Fluid management is a crucial issue in intensivecare medicine This study evaluated the feasibility and reproducibility of bioimpedance spectroscopy to measure bodywater composition in critically ill patients and compared fluid balance and daily changes in total body water TBW measured by bioimpedance This observational study included 25 patients under mechanical ventilation Fluid balance and bioimpedance measurements were recorded on 3 consecutive days Wholebody bioimpedance spectroscopy was performed with exact or ideal body weights entered into the device and with or without ICU monitoring Reproducibility of bioimpedance spectroscopy was very good in all conditions despite ICU monitoring and mechanical ventilation Bioimpedance measurements using an ideal body weight varied significantly making the weighing procedure necessary Comparison of fluid balance and daily changes in body weight provided the best correlation ρ = 074 P  00001 Daily changes in TBW were correlated with fluid balance Spearman coefficient ρ = 031 P = 0003 and this correlation was improved after exclusion of patients with a SOFA score 10 ρ = 036 P = 005 and with extracorporeal circulation ρ = 050 P = 0005 Regardless of the technique used to estimate volume status important limits of agreement were observed Noninvasive determination of bodywater composition using bioimpedance spectroscopy is feasible in critically ill patients but requires knowledge of the patient’s weight The best method to assess volume status after fluid resuscitation and the value gained from information about body composition provided by bioimpedance techniques needs further evaluation

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