Table 2.
Changes of gas exchanges, and respiratory rate during NIV according to treatment
| Optimized Ventilation | Standard ventilation | P | |
|---|---|---|---|
| After 30 minutes of NIV | |||
| RR, cycles/minute | 28 ± 6 | 26 ± 7 | .197 |
| Vt/IBW, ml/Kg | 7.8 ± 1.4 | 7.4 ± 1.8 | .316 |
| After 2 hours of NIV | |||
| RR, cycles/minute | 25 ± 4 | 24 ± 6 | .285 |
| Vt/IBW, ml/Kg | 8.0 ± 1.7 | 7.4 ± 1.8 | .260 |
| PaO2/FiO2 | 220 ± 58 | 241 ± 49 | .119 |
| HCO3-, mmol/l | 33 ± 6 | 32 ± 7 | .537 |
| After 6 hours of NIV | |||
| RR, cycles/minute | 24 ± 4 | 24 ± 7 | .827 |
| Vt/IBW, ml/Kg | 8.0 ± 2.1 | 7.6 ± 2.1 | .395 |
| PaO2/FiO2 | 235 ± 60 | 243 ± 37 | .506 |
| HCO3-, mmol/l | 33 ± 6 | 32 ± 7 | .534 |
| After 24 hours of NIV | |||
| RR, cycles/minute | 22 ± 6 | 22 ± 4 | .932 |
| Vt/IBW, ml/Kg | 8.1 ± 2.4 | 7.7 ± 2.1 | .545 |
| PaO2/FiO2 | 235 ± 60 | 243 ± 37 | .713 |
| HCO3-, mmol/l | 35 ± 7 | 33 ± 6 | .404 |
Data reported as mean ± standard deviation. IBW, ideal body weight; RR, respiratory rate; Vt, tidal volume.