Table 2 Intraoperative Variables

n = 41

n = 41

n = 41

n = 41

V_T (mL)

562 ± 109

377 ± 80^a

386 ± 82^a

524 ± 149

Ppeak (cmH₂O)

18.7 ± 4.3

23.1 ± 4.3^a

19.9 ± 3.8^c

17.4 ± 3.5

Pmean (cmH₂O)

5.6 ± 3.8

9.6 ± 1^a

9.5 ± 1.3^a

5.5 ± 1.9

Pplateau (cmH₂O)

14.2 ± 3.8

16.8 ± 2.5^a

16 ± 2.7^b

13 ± 2.7

pH

7.45 ± 0.05

7.42 ± 0.04

7.43 ± 0.04

7.44 ± 0.05

PaO₂ (mmHg)

277 ± 97

101 ± 52^a

111 ± 56^a

293 ± 91

PaCO₂ (mmHg)

29.2 ± 4.3

32.4 ± 3.7

31.6 ± 3.9

29.4 ± 4.5

SaO₂ (%)

99.3 ± 1

95.9 ± 3.2^a

96.1 ± 3.4^a

99.4 ± 1.1

A-aO₂ D

198 ± 95

372 ± 51^a

363 ± 56^a

184 ± 89