Comparison of physiological parameters in breaths with mask leak and airway obstruction
| Without mask leak, mean (SD) | With mask leak, mean (SD) | P value | |
| VTe (mL) | 6.8 (3.4) | 3.5 (1.4) | <0.001 |
| Oxygen saturation (%) | 71.6 (16.1) | 63.2 (13.3) | 0.010 |
| EtCO2 (mm Hg) | 30.9 (12.2) | 25.39 (10.0) | 0.002 |
| Heart rate (breaths per minute) | 123.9 (30.2) | 112.4 (26.6) | <0.001 |
| Without airway obstruction | With airway obstruction | ||
| VTe (mL) | 7.0 (3.0) | 1.7 (0.2) | <0.001 |
| Oxygen saturation (%) | 70.0 (16.3) | 69.1 (10.2) | 0.693 |
| EtCO2 (mm Hg) | 30.8 (11.1) | 26.0 (10.4) | 0.003 |
| Heart rate (breaths per minute) | 121.3 (29.1) | 118.7 (28.8) | 0.269 |
The p values were calculated from a paired t-test.
EtCO2, end-tidal carbon dioxide; VTe, tidal volume expired.