Table 1
Arterial blood gas measurements in seated and supine position
Seated position
Supine position
Before surgery
pH
7.42
7.39
Pa
o
2
(mm Hg)
47
64
PaC
o
2
(mm Hg)
31
34
Sp
o
2 (%)
83
92
After surgery
Sp
o
2 (%)
92
94