Table 2.
Detailed arterial blood gas parameters before and during CPAP in patients stratified by successful CPAP.
| Successful CPAP n = 217 | Failed CPAP n = 150 | Missing values | P value | |
|---|---|---|---|---|
| ABG before CPAP | ||||
| PaO2, mmHg | 62 (54−75) | 56 (45−72) | 20 (5.45) | 0.006 |
| SpO2, % | 93 (90−96) | 90 (84−95) | 2 (0.54) | <0.001 |
| FiO2, % | 50 (50−100) | 50 (50−100) | 83 (23) | 0.751 |
| Lactate, mmol/L | 1.1 (0.8−1.4) | 1.3 (1−1.9) | 62 (17) | <0.001 |
| Respiratory rate, breaths/min | 26 (20−32) | 26 (22−35) | 127 (35) | 0.037 |
| PaO2/FiO2, mmHg | 120 (75−160) | 103 (69−152) | 98 (27) | 0.412 |
| SpO2/FiO2, % | 180 (96−194) | 160 (95−196) | 84 (23) | 0.755 |
| ROX index | 6 (4−9) | 7 (4−10) | 206 (56) | 0.854 |
| ABG during CPAP | ||||
| PaO2, mmHg | 106 (76.05−167) | 68(53.65−92.55) | 38 (10.35) | <0.0001 |
| SpO2, % | 98 (95−99) | 94 (87.5−97) | 2 (0.54) | 0.0019 |
| FiO2, % | 50 (50−60) | 60 (50−60) | 21 (5.72) | <0.0001 |
| Lactate, mmol/L | 1 (0.8−1.4) | 1.3 (0.9−1.7) | 89 (24.25) | 0.0007 |
| Respiratory Rate, breaths/min | 24 (20−25) | 25 (22−30) | 130 (35.42) | <0.0001 |
| PaO2/FiO2, mmHg | 212 (145−332) | 121(87−173) | 50 (13.62) | <0.0001 |
| SpO2/FiO2, % | 192 (163−198) | 158 (137−190) | 21 (5.72) | <0.0001 |
| ROX index | 8 (7−10) | 6 (5−7) | 144 (39.24) | <0.0001 |
Values are reported as median (interquartile range) or number (percentage).
CPAP continuous positive airway pressure, ABG arterial blood gas, n number, PaO2 partial pressure of oxygen, SpO2 oxygen saturation, FiO2 inspired oxygen fraction.