Table 2.
Intraoperative blood gas analysis among three groups
| Variables | Sample collection time point | HFNC 40 (n = 22) |
HFNC 60 (n = 20) |
NPA (n = 23) |
|---|---|---|---|---|
| SpO2 | Before induction of anesthesia | 98.2 ± 1.4 | 97.4 ± 2.0 | 97.5 ± 1.2 |
| 15 min after induction of anesthesia | 99.4 ± 1.0 | 99.6 ± 0.5 | 99.8 ± 0.4 | |
| 15 min after achieving position | 99.6 ± 0.7 | 99.5 ± 0.6 | 99.7 ± 0.6 | |
| End of dura suspension | 99.6 ± 0.7 | 99.6 ± 0.5 | 99.8 ± 0.4 | |
| Cortical functional mapping | 99.5 ± 0.8 | 99.8 ± 0.3 | 99.9 ± 0.2 | |
| 15 min after re-induction | 99.7 ± 0.7 | 99.6 ± 0.6 | 99.7 ± 0.5 | |
| PaCO2 | Before induction of anesthesia | 39.4 ± 3.7 | 38.6 ± 4.7 | 39.5 ± 4.9 |
| 15 min after induction of anesthesia | 46.2 ± 4.6 | 45.8 ± 7.3 | 49.6 ± 6.6 | |
| 15 min after achieving position | 48.0 ± 4.3 | 47.9 ± 6.3 | 50.7 ± 6.2 | |
| End of dura suspension | 50.2 ± 4.1 | 49.2 ± 6.1 | 51.7 ± 6.2 | |
| Cortical functional mapping | 44.1 ± 2.8 | 42.3 ± 4.9 | 43.6 ± 5.9 | |
| 15 min after re-induction | 47.0 ± 4.3 | 46.0 ± 5.0 | 48.3 ± 5.4 | |
| PaO2/FiO2 | Before induction of anesthesia | 451.8 ± 69.4 | 421.9 ± 112.7 | 447.8 ± 64.9 |
| 15 min after induction of anesthesia | 475.5 ± 81.7 | 496.00 ± 80.54 | 332.1 ± 115.0*# | |
| 15 min after achieving position | 500.5 ± 93.6 | 499.45 ± 73.21 | 376.9 ± 92.1*# | |
| End of dura suspension | 477.6 ± 103.8 | 464.2 ± 90.8 | 384.3 ± 98.6*# | |
| Cortical functional mapping | 475.0 ± 106.1 | 465.4 ± 78.0 | 275.1 ± 92.8*# | |
| 15 min after re-induction | 488.1 ± 100.4 | 494.7 ± 81.0 | 315.6 ± 93.9*# |
Data were expressed as mean ± SD. *P < 0.05 compared with HFNC 40 group; #P < 0.05 compared with HFNC 60 group. HFNC: high-flow nasal cannula; NPA: nasopharyngeal airway