Table 3.
Mean PaO2 value, oscillations amplitudes and mean airway pressure associated with different ventilatory modes (volume or pressure), I:E ratios ranging from 1:4 to 4:1, tidal volume of 20 ml kg−1, and respiratory rate of 6 breaths per minute.
| I:E | Volume control | Pressure control | ||||
|---|---|---|---|---|---|---|
| PaO2 mean (mmHg) | PaO2 oscillation amplitude (mmHg) | Airway Pressure (cmH2O) | PaO2 mean (mmHg) | PaO2 oscillation amplitude (mmHg) | Airway Pressure (cmH2O) | |
| 1:2 | 133 ± 21$ | 32 ± 9$ | 6 ± 4 | 113 ± 22* | 28 ± 6* | 8 ± 5 |
| 2:1 | 146 ± 18$ | 20 ± 7$ | 8 ± 4 | 127 ± 25* | 21 ± 5* | 12 ± 5 |
| 1:4 | 137 ± 18* | 36 ± 11 | 5 ± 3 | 146 ± 15 | 40 ± 13 | 6 ± 5 |
| 4:1 | 161 ± 13 | 15 ± 6 | 9 ± 4 | 161 ± 18 | 22 ± 6 | 14 ± 5 |
Values are mean ± standard deviation recorded for 2 min at steady state. RR: respiratory rate. VT: tidal volume. Results from 5 animals are presented, apart from the following *: 6 and $: 7 animals.