Table 2 Intra-operative data of the three groups of patients

56.81 ± 4.31^a

49.19 ± 3.33^a

39.47 ± 3.70^a

< 0.001

22.06 ± 3.93^a

27.59 ± 3.58^a

39.47 ± 2.18^a

< 0.001

79.80 ± 4.94^a

76.90 ± 3.95^a.b

79.74 ± 4.62^b

0.002

26.60 ± 0.88

26.33 ± 1.10

26.58 ± 1.06

0.224

Pressure gradient (mmHg)

4.71 ± 0.88^a

4.64 ± 1.05^b

3.66 ± 0.88^a.b

< 0.001