| | HFNC1 | Conventional O2 | HFNC2 |
|---|
RR (breaths/min) | 20.5 ± 2.9 | 21.4 ± 4 | 20.0 ± 1.9 |
TiNEUR (s) | 0.92 ± 0.21 | 0.95 ± 0.22 | 0.92 ± 0.17 |
pH | 7.45 ± 0.07 | 7.44 ± 0.08 | 7.46 ± 0.08 |
PaCO2 (mmHg) | 49.9 ± 11.9 | 51.8 ± 12.7 | 50.1 ± 12.6 |
HCO3− (mEq/L) | 30.9 ± 7.6 | 31.3 ± 7.8 | 31.4 ± 8.4 |
PaO2 (mmHg) | 75.1 ± 6.9 | 72.9 ± 8.6 | 81.2 ± 8 |
Applied FiO2a | 0.46 ± 10 | 0.80 ± 0.19b,c | 0.46 ± 0.12 |
- Data are expressed as mean ± standard deviation
- Conventional O2 conventional low flow oxygen therapy through a nonocclusive face mask, FiO2 inspiratory oxygen fraction, HFNC high-flow nasal cannula oxygen therapy, PaCO2 arterial partial carbon dioxide pressure, PaO2 arterial partial oxygen pressure, RR respiratory rate, TiNEUR neural inspiratory time
- a The FiO2 delivered during conventional O2 therapy is overestimated since the patient’s inspiratory flow was higher than the mask flow (10 L/min) and, therefore, the difference between patient inspiratory flow and mask flow was taken by room air; this makes inappropriate any comparison between the PaO2/FiO2 ratio in the different experimental conditions
- b Different from HFNC1, ANOVA, with Bonferroni correction
- c Different from HFNC2, ANOVA, with Bonferroni correction
