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Calculation of Metabolic Expenditure and Substrate Utilization from Gas Exchange Measurements
Author(s) -
Westenskow Dwayne R.,
Schipke Constance A.,
Raymond Janice L.,
Saffle Jeffrey R.,
Becker James M.,
Young Elizabeth W.,
Cutler Christopher A.
Publication year - 1988
Publication title -
journal of parenteral and enteral nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.935
H-Index - 98
eISSN - 1941-2444
pISSN - 0148-6071
DOI - 10.1177/014860718801200120
Subject(s) - metabolic rate , significant difference , mathematics , intensive care unit , medicine , chemistry , statistics , intensive care medicine
At least nine different equations have been published for calculating metabolic expenditure by indirect calorimetry. This study examined the differences between equations when they are used for the nutritional assessment in an intensive care unit (ICU). Oxygen consumption and carbon dioxide production were measured in 36 ICU patients and used to calculate metabolic expenditure with the nine equations. The equations produced differences in metabolic expenditure which averaged from 0.8–96 kcal/day. The largest difference produced by any two of the nine equations was 189 kcal/day. Although differences in original stoichiometric data have resulted in numerous different equations for the calculation of metabolic expenditure, these differences are not clinically important. It makes little difference which equation is used for nutritional assessment in an ICU. (Journal of Parenteral and Enteral Nutrition 12: 20–24, 1988)