Table 2.
Summary of respiratory parameters before and during nasal HFV
| Study time, min
|
||||||
|---|---|---|---|---|---|---|
| Variable mean ± standard deviation | Pre-NHFV | 30 min | 60 min | 90 min | 120 min | p-value |
| Heart rate | 176 ± 15 | 169 ± 12 | 170 ± 12 | 166 ± 16 | 166 ± 15 | 0.084 |
| Respiratory rate | 49 ± 12 | 60 ± 18 | 53 ± 13 | 52 ± 16 | 51 ± 15 | 0.569 |
| FiO2, % | 23 ± 4 | 22 ± 3 | 22 ± 3 | 22 ± 3 | 23 ± 3 | 0.136 |
| SpO2, % | 96 ± 3 | 95 ± 4 | 95 ± 3 | 95 ± 4 | 96 ± 3 | 0.207 |
| TCOM, torr | 47 ± 5 | 48 ± 5 | 49 ± 10 | 46 ± 4 | 46 ± 5 | 0.003 |
| Amplitude, cm H2O | 41 ± 6 | 45 ± 5 | 47 ± 4 | 50 ± 6 | 51 ± 6 | <0.0001 |
| Capillary pCO2, torr | 50 ± 6 | NA | NA | NA | 45 ± 9 | 0.011 |
| Capillary pH, torr | 7.37 ± 0.04 | NA | NA | NA | 7.40 ± 0.06 | 0.043 |