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Table 2 Overview of comparative studies of IC devices in mechanically ventilated patients [16, 64,65,66,67]

From: Energy expenditure and indirect calorimetry in critical illness and convalescence: current evidence and practical considerations

  Q-NRG® Deltatrac®
Deltatrac® (Datex, Finland) - (No) significant difference in measured REE [16]
- Measurements using Q-NRG® significantly faster [16]
 
QUARK RMR®
(Cosmed, Italy)
- Significant difference in measured REE (p = 0.038)
- Measurements using Q-NRG® significantly faster [16]
- No significant difference in mean REE (p = 0.166)
- No significant differences EE, VCO2, and VO2 [66]
- Significant difference in RQ (p < 0.0001) not favoring Deltatrac®, due to measurement values outside the physiological range [60]
- Overestimation of VO2 and VCO2 by QUARK RMR® [67]
Vmax® (Vyaire, USA) - Significant difference in measured REE (p < 0.001)
- Measurements using Q-NRG® significantly faster [16]
- No significant difference in REE (p = 0.8) is not reliable enough in a clinical research setting [65]
E-COVX® (Datex-Ohmeda, Finland) - No significant difference in measured REE (p = 0.165)
- No significant difference in the duration of measurement
- Overestimation of VO2 and VCO2 by E-COVX® [67]
CCM Express® (Medgraphics, USA)   - Significant difference in mean REE (p < 0.0001)
- Significant difference in RQ (p < 0.0001)
- Significant differences in RQ and VO2 and VCO2 (p < 0.0001) [66]