Table 1 HR, arterial blood gases and hemodynamic parameters at each time point after surgical procedures in four groups are shown (n = 6 in each group) $\left(\overline{\mathit{x}}\mathbf{\pm }\mathbf{s}\right)$

HR (beats/min)

Group 1

152 ± 5

155 ± 7

154 ± 8

157 ± 8

Group 2

155 ± 7

158 ± 6

156 ± 9

160 ± 7

Group 3

155 ± 5

162 ± 5^*#

168 ± 9^*#Δ

175 ± 8^*

Group 4

154 ± 6

160 ± 6

168 ± 8^*Δ

167 ± 7^*

pH

Group 1

7.32 ± 0.06

7.33 ± 0.03

7.29 ± 0.10

7.31 ± 0.01

Group 2

7.25 ± 0.04

7.26 ± 0.04

7.24 ± 0.03

7.21 ± 0.01

Group 3

7.25 ± 0.11^#

7.11 ± 0.18

7.23 ± 0.05

7.15 ± 0.14^#

Group 4

7.27 ± 0.05

7.18 ± 0.19

7.13 ± 0.11^#

7.15 ± 0.20

PaCO₂ (mmHg)

Group 1

36.88 ± 6.06

41.52 ± 12.41

40.18 ± 13.86

40.84 ± 10.62

Group 2

38.88 ± 6.66

42.52 ± 12.41

42.18 ± 10.86

44.84 ± 7.62

Group 3

41.43 ± 9.51

56.77 ± 22.75

49.15 ± 14.03

47.48 ± 14.15

Group 4

38.88 ± 6.66

48.52 ± 22.41

45.18 ± 13.86

47.84 ± 17.62

PaO2/FiO2(mmHg)

Group 1

484.42 ± 28.34

475.50 ± 20.80

543.45 ± 61.56

423.20 ± 23.20

Group 2

430.95 ± 28.37

428.75 ± 37.50

431.25 ± 39.24◆

435.00 ± 31.62◆

Group 3

410.40 ± 28.36

335.55 ± 29.29^*#Δ

287.90 ± 54.84^*#Δ

292.83 ± 60.34^*#Δ

Group 4

441.43 ± 24.26

371.87 ± 20.35^*#

368.83 ± 55.29^*#Δ◆

380.63 ± 56.83◆

MPAP (mmHg)

Group 1

14 ± 1

14 ± 1

13 ± 3

12 ± 1

Group 2

16 ± 2

15 ± 2

14 ± 1

15 ± 2

Group 3

17 ± 3

24 ± 4^*#Δ

22 ± 4^#Δ

18 ± 4^#§

Group 4

17 ± 4

19 ± 3^#Δ◆

20 ± 2^#Δ

15 ± 2^#§

CO(l/min)

Group 1

2.95 ± 0.32

2.84 ± 0.24

2.84 ± 0.69

2.86 ± 0.53

Group 2

2.60 ± 1.00

2.62 ± 1.04

2.62 ± 1.08

2.73 ± 1.03

Group 3

2.88 ± 1.04

2.60 ± 1.14

2.71 ± 1.28

2.63 ± 1.19

Group 4

3.01 ± 0.64

2.62 ± 0.26

3.17 ± 0.54

3.20 ± 0.55

PVR(dyne.s.cm^-5)

Group 1

164.24 ± 45.61

200.94 ± 59.54

140.46 ± 55.84

171.59 ± 38.72

Group 2

301.25 ± 96.77^#

253.68 ± 99.09

299.52 ± 92.64^#

271.66 ± 93.89^#

Group 3

373.20 ± 89.09^#

601.01 ± 92.33^*#Δ

435.88 ± 99.63^#

327.09 ± 96.66^#§

Group 4

335.88 ± 63.46^#

474.67 ± 87.91^*#

335.93 ± 43.84^#

239.86 ± 53.26^*◆^§