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Table 2 Mean 24-h results of VCO2, VO2, RQ, and EE measurements

From: Ventilator-derived carbon dioxide production to assess energy expenditure in critically ill patients: proof of concept

  Mean ± SD p value (vs. calorimetry)
VCO2 (ml/min)   
 Calorimetry 225 ± 47  
 Ventilator 240 ± 52 <0.001
VO2 (ml/min)   
 Calorimetry 265 ± 59  
RQ   
 Calorimetry 0.8592 ± 0.0473  
 Nutrition 0.8636 ± 0.0119 0.410
 Nutritiona 0.8629 ± 0.0151 0.485
Energy expenditure (kcal/24 h)   
 Calorimetry 1823 ± 408  
 VCO2-derived 1963 ± 431 <0.001
 HB equation 1576 ± 257 <0.001
 Esp25 1979 ± 400 <0.001
 Faisy equation 1999 ± 269 <0.001
 PSU 1801 ± 314 0.431
 HB15 1813 ± 295 0.724
  1. Calorimetry measured with indirect calorimetry, Esp25 European Society for Clinical Nutrition and Metabolism -guideline equation of 25 kcal/kg/day, HB15 Harris–Benedict equation with 15 % added; PSU Penn State University 2003b equation, RQ respiratory quotient, SD standard deviation, VCO 2 -derived carbon dioxide production, VCO 2 -derived from ventilator-derived carbon dioxide production and nutritional respiratory quotient, VO 2 oxygen consumption
  2. aIncluding macronutrient intake from intravenous propofol and glucose