Gas mixture | PaCO2 (mmHg) | PaO2/FiO2 | PaO2/PAO2 |
---|
50%/50% Nitrogen/oxygen | 45 ± 10 | 267 ± 108 | 0.43 ± 0.17 |
50%/50% Heliox | 44 ± 10 | 267 ± 95 | 0.43 ± 0.15 |
60%/40% Heliox | 43 ± 11 | 275 ± 87 | 0.45 ± 0.14 |
70%/30% Heliox | 42 ± 12 | 259 ± 55 | 0.45 ± 0.09 |
- Values are expressed as mean ± standard deviation. Two-factor, repeated-measures analysis of variance found no statistically significant difference between the mean values for PaCO2, PaO2/FiO2, and PaO2/PAO2 for the different gas mixtures (P = 0.93, P = 0.98, and P = 0.96, respectively).