Table 3. Pulmonary and pulmonary gas exchange parameters of the patients.
| Group | Factor | T0 | T1 | T2 | T3 | T4 |
|---|---|---|---|---|---|---|
| I | Cdyn (mL/cmH2O) | 51.33±10.96 | 29.07±8.66# | 29.27±8.02 | 29.27±8.60 | 48.60±10.72 |
| VD/VT (%) | 10.73±5.24 | 19.47±4.88# | 21.73±4.70 | 24.27±4.91 | 24.20±6.75# | |
| QS/QT (%) | 19.56±12.24 | 21.52±15.15 | 19.07±10.30 | 20.01±13.58 | 26.20±20.78 | |
| II | Cdyn (mL/cmH2O) | 47.60±10.61 | 27.13±5.78# | 32.53±5.99^ | 33.80±5.47 | 50.93±9.79# |
| VD/VT (%) | 9.47±5.80 | 15.20±7.04# | 16.93±6.91 | 18.40±7.76 | 21.47±7.58# | |
| QS/QT (%) | 15.75±4.47 | 14.83±6.58 | 15.53±7.60 | 13.82±7.85 | 12.33±6.29 | |
| III | Cdyn (mL/cmH2O) | 50.71±10.97 | 33.14±8.96# | 42.57±10.26^ | 42.79±10.72 | 56.71±11.06# |
| VD/VT (%) | 9.86±7.78 | 14.64±6.77# | 14.43±7.96 | 15.79±7.53 | 12.21±6.84 | |
| QS/QT (%) | 19.41±9.79 | 18.17±11.66 | 19.60±10.24 | 22.96±14.79 | 19.28±9.26 | |
| IV | Cdyn (mL/cmH2O) | 50.40±23.50 | 29.70±7.63# | 39.90±13.99^ | 41.30±13.09 | 59.20±19.33# |
| VD/VT (%) | 9.30±9.07 | 15.80±6.84# | 12.90±8.37 | 16.00±7.53 | 11.60±7.38 | |
| QS/QT (%) | 20.71±10.28 | 30.35±17.54 | 36.19±14.67# | 31.71±16.12# | 29.36±15.48 |
Data are shown as means ± SD. Group I: control group (no PEEP); Group II: received PEEP at 4 cmH2O; Group III: received PEEP at 8 cmH2O; Group IV: received PEEP at 12 cmH2O. T0: baseline (after anesthesia induction but before PNP and position change); T1: 5 min after PNP and position change; T2: 30 min and T3: 60 min after PEEP; T4: end of surgery but before extubation. #, P<0.05, compared to the baseline in the same group; ^, P<0.05, compared to the previous time point in the same group. PNP, pneumoperitoneum.