Pulmonary function test and predictive values during on continuous positive airway pressure (ETT CPAP)
| Indicators |
Failed extubation
n = 6 |
Successful extubation
n = 45 | P value |
| ETT CPAP (cmH2O) (median, IQR) FiO2 | 3 (3, 3) 0.3 (0.21, 0.3) | 3 (3, 3) 0.3 (0.21, 0.3) | 0.63 0.71 |
| Pass Spontaneous breathing test, n (%) | 6 (100) | 44 (97.8) | 1.00 |
| Expiratory tidal volume (ml./kg.) (median, IQR) Expiratory minute ventilation (l/min/kg.) (mean, SD) Frequency (/min) (median, IQR) | 5.1 (3.3, 6.7) 0.3 (0.2) 81 (76.2, 83.5) | 6.2 (4.6, 7.3) 0.4 (0.1) 68 (60,81) | 0.36 0.51 0.23 |
| Ratio VE TOT ≥0.8 | 4 (66.7) | 41 (91.1) | 0.14 |
| Ratio VE TOT ≥ 0.5 | 2 (33.3) | 25 (55.6) | 0.40 |
| Ratio fr ≤ 1.5 | 1 (16.7) | 2 (4.4) | 0.32 |
Ratio VE TOT, ratio of mean minute ventilation between breathing on ET CPAP and mechanical ventilation:
Ratio fr, ratio of mean respiratory rate between breathing on ET CPAP and mechanical ventilation.