• Maria Auxiliadora Martins, Mayra Gonçalves Menegueti, Edson Antônio Nicolini, Michele Ferreira Picolo, Alessandra Fabiane Lago, Olindo Assis Martins Filho, and Anibal Basile Filho.
• Department of Surgery and Anatomy, FMRP, USP, Ribeirao Preto, SP, Brazil. mamartins@hcrp.usp.br
• Acta Cir Bras. 2011 Jan 1;26 Suppl 2:51-6.

PurposeThe 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.MethodsThirty 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.ResultsREE 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.ConclusionThese 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.

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