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. 2021 Oct 23;57(12):757–763. doi: 10.1016/j.arbr.2021.10.010

Table 2.

Arterial and venous blood gases in the different patient groups.

a) Arterial blood Historical control group Synchronous control group Covid-19 patients
n = 1089 n = 73 n = 139
Age (years) 69 ± 18 67 ± 18 66 ± 17
Women (%) 46 45 43
Number of blood gas analyses (n) 2614 251 549
PaO2 (mmHg) 87 ± 46 86 ± 28 88 ± 33
CaO2 (ml/dL) 16.2 ± 4.1 15.5 ± 3.9 17.5 ± 3.2***+++
PaCO2 (mmHg) 43.5 ± 12.9 42.0 ± 12.8 39.4 ± 10.5***++
pH 7.40 ± 0.09 7.41 ± 0.08 7.42 ± 0.08***
Bic. Standard (mmol/L) 25.4 ± 5.2 25.8 ± 7.0 24.6 ± 4.0***+
BE (mmol/L) 0.7 ± 4.5 0.3 ± 4.8 −0.7 ± 3.9***++
Hb (g/dl) 12.4 ± 2.3 11.8 ± 2.4 13.3 ± 1.8***+++
Ferritin (ng/mL) 553 ± 690 (NR1) 725 ± 687 (NR2) 1280 ± 1628***+
b) Venous blood Historical control group Synchronous control group Covid-19 patients
n = 1461 n = 379 n = 215
Age (years) 65 ± 23 64 ± 22 67 ± 18
Sex (women, %) 46 46 49
Number of blood gas analyses (n) 3098 1069 544
PvO2 (mmHg) 34 ± 9 34 ± 9 34 ± 9
PvCO2 (mmHg) 45.7 ± 10.0 45.8 ± 10.7 44.8 ± 9.2*+
CvO2 (ml/dL) 10.3 ± 5.4 9.8 ± 5.1 11.2 ± 5.2*++
pH 7.37 ± 0.07 7.36 ± 0.08 7.38 ± 0.06***+++
Bic. Standard (mmol/L) 24.0 ± 4.3 23.8 ± 5.2 24.4 ± 4.0*++
BE (mmol/L) 0.3 ± 4.0 −0.2 ± 4.2 1.0 ± 4.1***+++

BE: base excess; Bic.: bicarbonate; CaO2: oxygen in arterial blood; COVID-19: coronavirus disease of 2019; CvO2: oxygen in venous blood; PaO2: partial pressure of oxygen in arterial blood; PaCO2: partial pressure of carbon dioxide in arterial blood; pH: potential of hydrogen; PvCO2: partial pressure of carbon dioxide in venous blood; PvO2: partial pressure of oxygen in venous blood.

Significance levels between historical control and Covid-19 patients:

* p ≤ 0.05; ** p ≤ 0.01; *** p ≤ 0.001.

Significance levels between synchronous controls and Covid-19 patients: + p ≤ 0.05; ++ p ≤ 0.01; +++ p ≤ 0.001.