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Table 3 Accuracy of energy expenditure based on CO2 measurements (EEVCO2) versus energy expenditure (EE) measured by indirect calorimetry according to the timing of evaluation and energy provision rate at the time of evaluation

From: Can calculation of energy expenditure based on CO2 measurements replace indirect calorimetry?

 

n

EEVCO2_0.85

EEVCO2_FQ

±5% EE

(%)

p value

±5% EE

(%)

p value

Timing of evaluation

≤7 ICU day

131

58

44

0.577

59

45

0.667

>7 ICU day

147

70

48

70

48

Energy provision

<90% EE

139

65

47

0.810

63

45

0.718

≥90% EE

139

63

45

66

47

  1. Timing of evaluation: patient stratification by measurements before or after the 7th day after ICU admission, Energy provision: patient stratification according to the proportion of energy provision at the time of measurement < 90 or ≥ 90% of EE, ±5%.
  2. EEVCO 2 _0.85 EE calculated using measured CO2 consumption (VCO2) and fixed respiratory quotient (RQ) of 0.85, EEVCO 2 _FQ EE calculated using measured VCO2 and the food quotient (FQ) as the RQ, EE number of patients with EEVCO2 values within ±5% of EE, P values: chi-square tests