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JA Clinical Reports

Table 1 Results of blood gas analysis in the COVID-19 patient

From: Does a surgical mask improve oxygenation in COVID-19 patients?

Oxygen supply device

Nasal cannula

Oxygen mask

Nasal cannula

Oxygen flow rate (L/min)

4

4

4

pH

7.38

7.41

7.41

PaO2 (mmHg)

154

108

150

PaCO2 (mmHg)

36.1

32.9

32.6

Base excess (mmol/L)

−3.5

−3.4

−3.8

Respiratory rate (breaths/min)

29

30

28

  1. We collected arterial blood samples and performed blood gas analysis when the patient wore a nasal cannula under the surgical mask and when the patient wore an oxygen mask over the surgical mask. Blood samples were taken between 15 and 60 min after the change in oxygen administration method, i.e., after the patient received oxygen for at least 15 min by the method being tested. This was to clarify that the results of blood gas analysis were due to the different methods of oxygen administration. Arterial blood was analyzed by a blood gas analyzer (ABL800 FLEX, Radiometer Medical ApS, Denmark). PaO2, partial pressure of oxygen in arterial blood; PaCO2, partial pressure of carbon dioxide in arterial blood
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