Table 1

ABG parameters of the patient in the sitting and recumbent position

ParametersSitting position, room air#Recumbent position, room air
PaCO223.2 mmHg23.7 mmHg
PaO250.5 mmHg60.6 mmHg
HCO317.3 mmol·L−117.1 mmol·L−1
Alveolar–arterial gradient70.2 mmHg59.5 mmHg

PaCO2: arterial carbon dioxide tension; SaO2: arterial oxygen saturation; HCO3: bicarbonate ion concentration; SpO2: oxygen saturation measured by pulse oximeter; FIO2: inspiratory oxygen fraction. #: SpO2 84%, heart rate 113 beats per min, PaO2/FIO2 240; : SpO2 93%, heart rate 79 beats per min, PaO2/FIO2 314.