Table 2. Intraoperative blood gas analysis and pneumodynamics.
| Variables | T0 | T1 | T2 | T3 | T4 |
|---|---|---|---|---|---|
| PH | |||||
| Group C | 7.39±0.04 | 7.37±0.05* | 7.37±0.04* | 7.38±0.04 | 7.38±0.04 |
| Group G | 7.40±0.04 | 7.38±0.04* | 7.38±0.03* | 7.39±0.04 | 7.38±0.04 |
| P value | 0.81 | 0.33 | 0.25 | 0.18 | 0.21 |
| PaCO2 | |||||
| Group C | 40.0±2.2 | 40.8±2.2* | 40.7±2.4* | 40.5±2.5 | 40.5±2.5 |
| Group G | 39.9±2.4 | 40.4±2.5* | 40.5±2.7* | 40.5±2.8 | 40.6±2.8 |
| P value | 0.87 | 0.33 | 0.54 | 0.98 | 0.84 |
| Ppeak | |||||
| Group C | 16.3±2.5 | 25.2±2.7* | 25.6±2.6* | 17.8±3.1* | 18.0±3.2* |
| Group G | 16.4±2.6 | 23.4±2.8*# | 23.9±2.7*# | 17.4±2.7* | 17.9±2.7* |
| P value | 0.70 | <0.001 | <0.001 | 0.33 | 0.82 |
| Pplat | |||||
| Group C | 14.9±2.5 | 23.6±2.8* | 24.2±2.7* | 16.4±3.2* | 16.6±3.3* |
| Group G | 14.9±2.8 | 21.9±2.9*# | 22.5±2.8*# | 15.8±2.8* | 16.4±2.8* |
| P value | 0.93 | <0.001 | <0.001 | 0.24 | 0.74 |
| Cdyn | |||||
| Group C | 41.7±5.3 | 26.6±4.5* | 26.5±4.3* | 37.7±4.8* | 37.8±5.0* |
| Group G | 42.0±4.3 | 32.4±5.4*# | 31.9±5.6*# | 39.4±5.9*# | 38.9±6.2* |
| P value | 0.73 | <0.001 | <0.001 | 0.04 | 0.21 |
Continuous data are presented as mean ± SD. *, P <0.05 versus T0; #, P<0.05 versus group C. PH, potential of hydrogen; PaCO2, arterial partial pressure of carbon dioxide; Ppeak, peak airway pressure; Pplat, plateau airway pressure, Cdyn, dynamic lung compliance; T0, before one-lung ventilation (OLV); T1, 30 min after OLV; T2, 60 min after OLV; T3, 10 min after re-expansion; T4, the end of operation.