• Paolo Formenti, Silvia Coppola, Michele Umbrello, Sara Froio, Alessio Caccioppola, Valentina De Giorgis, Valentina Galanti, Andrea Clarissa Lusardi, Erica Ferrari, Donatella Noè, Simone Carnier, Franco Folli, and Davide Chiumello.
• SC Anestesia e Rianimazione, Ospedale San Paolo - Polo Universitario, ASST Santi Paolo e Carlo, Milan, Italy. Electronic address: formenti.paolo80@gmail.com.
• J Crit Care. 2022 Apr 1; 68: 89-95.

PurposeSeveral different tools have been developed to integrate the clinical and biochemical nutritional evaluations in critical care patients. Aims of this study were to evaluate the changes in the Bioelectrical Impedance Vector Analysis (BIVA) and ultrasonographic features of the diaphragm (DTee) and rectus femoris (RFCSA) during the first week of ICU stay.Materials And MethodsNinety-six adult mechanically ventilated patients enrolled within 24 h after the admission to the ICU (T1). RFCSA and diaphragm end-expiratory thickness were measured, as well as BIVA parameters. Anthropometric data and biochemical parameters were collected. The measurements were repeated on the 3rd (T3) and 7th (T7) days of ICU stay.ResultsDuring the study period, the phase angle significantly decreased by 21%, reactance by 27%, and resistance by 11%. Both RFCSA and DTee significantly decreased, while neither were correlated to any BIVA parameter. DTee was considerably higher in survivors vs. non-survivors.ConclusionsBody composition is significantly modified after one week of ICU stay. BIVA may be useful in the definition of hydration state, while it does not seem to track muscle mass. Different temporal trends of specific BIVA and muscle ultrasound parameters were found in patients with high or low severity of illness.Copyright © 2021 Elsevier Inc. All rights reserved.

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