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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
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Critical Care

ISSN: 1364-8535