Clinical variables at failure of CPAP
| Control | Nebulised surfactant | |
| FiO2 | 0.36 (0.13) | 0.32 (0.05) |
| pH | 7.24 (0.10) | 7.31 (0.06) |
| PaCO2, mm Hg | 58.9 (20.5) | 44.7 (12.5) |
| Respiratory rate, breaths/min | 63 (17) | 70 (18) |
| nCPAP, cmH2O | 6.3 (0.6) | 6.3 (0.6) |
Values are expressed as mean (SD).
CPAP, continuous positive airway pressure; FiO2, fractional inspired oxygen; nCPAP, nasal continuous positive airway pressure; PaCO2, partial pressure of carbon dioxide in arterial blood.