Table 2 Ventilation distribution and respiratory parameters of patients undergoing abdominal surgery

 forced

16.5 (16.0–17.3)

17.8 (16.9–18.2)#

17.4 (16.2–18.2)#

 at rest

16.3 (14.5–17.2)$

17.1 (15.5–17.9)$

17.3 (15.8–18.2)

 forced

16.1 (15.9–16.4)

16.1 (15.8–16.5)

16.8 (16.1–17.4)#

 at rest

15.7 (15–16.3)$

15.7 (14.8–16.4)$

16.4 (15.9–17.3)#

FVC%predicted

93 (80.3–106)

58 (49.5–64.5)*

64 (45.5–77.3)*

FEV1%predicted

91 (79–98)

53 (45–65)*

61 (46–73)*

Tiffeneau index

0.74 (0.71–0.78)

0.78 (0.73–0.81)*

0.77 (0.75–0.79)*

SpO₂%

97 (96–98)

93 (90–95)*

93 (91–96)*

Respiratory rate /min

14 (12–16)

18 (14–19)

16 (13–18)

 forced

0 (0–0)

3 (1–5)*

1 (0–2)*

 at rest

0 (0–0)

1 (0–3)*

0 (0–2)*

Epidural analgesia

23 (79%)

21 (72%)

 room air

30 (100%)

15 (52%)

27 (90%)

 supplemental oxygen

0 (0%)

14 (48%)

2 (7%)

 mechanical ventilation

0

1

0

 no

28 (93%)

26 (90%)

24 (83%)

 slight

2 (7%)

2 (7%)

4 (14%)

 moderate

0 (0%)

1 (3%)

0 (0%)

 severe

0 (0%)

0 (0%)

1 (3%)