Energy expenditure (EE) in mechanically ventilated patients: espen equation using different body weights (BW) vs. indirect calorimetry (IC)

Methods All mechanically ventilated patients staying >72h in ICU, with Fi02 < 60%, PEEP < 9cmH2O, no pulmonary fistula or lung multi-resistant bacteria were included and had IC measurement. We calculated EE with the ESPEN equation (20-25 kcal/kg acute phase and 25-30 kcal/kg post-acute phase), using several BW: anamnestic (BWAN), measured (BWMES), adjusted for water balance (BWADJ) and ideal BW calculated for a body mass index of 22.5 and 25 kg/m. Results are presented as mean ± SD. Calculated EE was compared to EE measured by IC, with ANOVA repeated measure and Bonferroni posthoc test, as well as Bland-Altman analysis.