Table 2 Relation between PetCO2 values and severity of pulmonary disease.

From: Comparing the novel microstream and the traditional mainstream method of end-tidal CO2 monitoring with respect to PaCO2 as gold standard in intubated critically ill children

Parameter

Mean difference ± SD (mmHg)

95% LLA (mmHg)

95% ULA (mmHg)

r

p

In All Subjects (n = 1338 pairs)

PaCO2–MainPetCO2

3.83 ± 8.99

− 13.79

21.46

0.63

 < 0.001

PaCO2–MicroPetCO2

7.39 ± 8.27

− 8.83

23.61

0.68

 < 0.001

Severity of pulmonary disease

Mild to moderate pulmonary diseasea

PaCO2–MainPetCO2

2.98 ± 8.40

− 13.49

19.46

0.64

 < 0.001

PaCO2–MicroPetCO2

6.70 ± 7.80

− 8.59

22.01

0.68

 < 0.001

Severe pulmonary diseaseb

PaCO2–MainPetCO2

14.83 ± 9.12

− 3.06

32.72

0.80

 < 0.001

PaCO2–MicroPetCO2

16.24 ± 9.05

− 1.49

33.99

0.81

 < 0.001

  1. All CO2 levels in mmHg. LLA = lower limit of agreement, ULA = upper limit of agreement, SD = standard deviation, PCO2 = partial pressure of carbon dioxide, PaCO2 = arterial PCO2, mainPetCO2 = mainstream end-tidal PCO2, microPetCO2 = microstream PCO2.
  2. aDefinition of mild to moderate pulmonary disease: oxygenation index < 10 (n = 1242 pairs).
  3. bDefinition of severe pulmonary disease: oxygenation index ≥ 10 (n = 96 pairs).
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