Table 4.
Effect of mechanical ventilation with heliox on parameters for gas exchange and dead-space
| Nitrox (T = 0) |
Heliox (T = 30) |
Nitrox (T = 60) |
Heliox (T = 90) |
Overall p – value |
|
| OI | 7.3 ± 6.0 | 6.8 ± 2.6 | 6.1 ± 2.1 | 6.6 ± 1.0 | 0.477 |
| Aa-DO2 | 155 ± 135 | 131 ± 33 | 133 ± 68 | 134 ± 28 | 0.507 |
| VI | 44.8 ± 22.2 | 46.1 ± 22.6 | 48.3 ± 22.6 | 45.2 ± 18.9 | 0.601 |
| VD/VT | 0.20 ± 0.09 | 0.21 ± 0.11 | 0.20 ± 0.08 | 0.20 ± 0.11 | 0.929 |
Data are expressed as mean ± standard deviations.
Aa-DO2 = alveolo-arterial oxygen gradient; OI = oxygenation index; VI = ventilation index; VD/VT = dead-space/tidal volume ratio.