Energy expenditure in critically ill surgical patients. Comparative analysis of predictive equation and indirect calorimetry

Gasto energético em pacientes cirúrgicos. Análise comparativa entre equação preditiva e calorimetria indireta

Maria Auxiliadora Martins Mayra Gonçalves Menegueti Edson Antônio Nicolini Michele Ferreira Picolo Alessandra Fabiane Lago Olindo Assis Martins Filho Anibal Basile Filho About the authors

PURPOSE: The aim of this investigation was to compare the resting energy expenditure (REE) calculated by the Harris-Benedict equation (REE HB) with the REE measured by indirect calorimetry (REE IC) in critically ill surgical patients under mechanical ventilation. METHODS: Thirty patients were included in this work. REE was calculated by the Harris-Benedict equation (REE HB) using real body weight, and it was also measured by indirect calorimetry (REE IC), which was performed for 30 minutes. RESULTS: REE HB had significant (p < 0.0005) but low correlation (Spearman r = 0.57) with REE IC, with a mean bias of 12 kcal.d-1 and limits of agreement ranging from - 599.7 to 623.7 kcal.d-1 as detected by the Bland-Altman analysis. CONCLUSION: These findings suggest that REE IC seems to be more appropriate than REE HB for accurate measurement of REE in critically ill surgical patients under mechanical ventilation.

Calorimetry; Instrumentation; Energy Metabolism; Intensive Care


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