• Am. J. Crit. Care · Jan 2016

    Comparative Study

    Harris-Benedict Equation and Resting Energy Expenditure Estimates in Critically Ill Ventilator Patients.

    • Michele Ferreira Picolo, Alessandra Fabiane Lago, Mayra Gonçalves Menegueti, Edson Antonio Nicolini, Anibal Basile-Filho, Altacílio Aparecido Nunes, Olindo Assis Martins-Filho, and Maria Auxiliadora-Martins.
    • Michele Ferreira Picolo is a dietitian, Alessandra Fabiane Lago is a physical therapist, Anibal Basile-Filho, Edson Antonio Nicolini, and Maria Auxiliadora-Martins are physicians, Divisão de Terapia Intensiva, Departamento de Cirurgia e Anatomia, Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. Mayra Gonçalves Menegueti is a nurse, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo. Altacílio Aparecido Nunes is a physician, Departamento de Medicina Social, Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo. Olindo Assis Martins-Filho is a biochemist, Laboratório de Biomarcadores de Diagnóstico e Monitoração, Instituto René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brazil.
    • Am. J. Crit. Care. 2016 Jan 1; 25 (1): e21-9.

    BackgroundIn routine practice, assessment of the nutritional status of critically ill patients still relies on traditional methods such as anthropometric measurements, biochemical markers, and predictive equations.ObjectiveTo compare resting energy expenditure measured by indirect calorimetry (REEIC) with REE calculated by using the Harris-Benedict equation with 3 different sources of body weight (from bed scale, REEHB1; ideal body weight, REEHB2; and predicted body weight, REEHB3).MethodsThis study included 205 critically ill patients (115 men, 90 women) evaluated within the first 48 hours of admission and undergoing mechanical ventilation. REE was measured by indirect calorimetry for 30 minutes and calculated by using the Harris-Benedict equation with the 3 sources of body weight. Data were compared by the Bland-Altman method.ResultsThe values based on ideal and predicted body weight (REEHB2 and REEHB3) did not agree with REEIC. Bland-Altman analysis showed that the limits of agreement varied from +796.1 kcal/d to -559.6 kcal/d for REEHB2 and from +809.2 kcal/d to -564.7 kcal/d for REEHB3. REEIC and REEHB1 (body weight determined by bed scale) agreed the best; the bias was -18.8 kcal/d. However, REEHB1 still overestimated REEIC by +555.3 kcal/d and underestimated it by -593.0 kcal/d.ConclusionFor measuring REE in critically ill patients undergoing mechanical ventilation, calculation via the Harris-Benedict equation, regardless of the source of body weight, cannot be substituted for indirect calorimetry.©2016 American Association of Critical-Care Nurses.

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