From: Chest wall mechanics during pressure support ventilation
Parameter | P | Pressure support (cmH2O) | |||
---|---|---|---|---|---|
 |  | 5 | 10 | 15 | 25 |
Tidal volume (l) | <0.001 | 0.340 ± 0.048 | 0.432 ± 0.064 | 0.610 ± 0.063 | 0.852 ± 0.070 |
Frequency (minute-1) | <0.001 | 27.7 ± 2.9 | 22.1 ± 2.6 | 15.9 ± 2.2 | 11.9 ± 1.7 |
Minute ventilation (l/minute) | NS | 8.5 ± 0.8 | 8.9 ± 1.2 | 8.6 ± 0.7 | 9.5 ± 1.2 |
Pao2/Fio2 (mmHg) | 0.042 | 299.3 ± 22.0 | 263.1 ± 22.8 | 288.2 ± 22.3 | 320.0 ± 25.4 |
Paco2 (mmHg) | NS | 35.4 ± 2.4 | 33.9 ± 2.7 | 33.9 ± 2.2 | 33.8 ± 2.0 |
f/Vt (1/l·minute) | <0.001 | 97.9 ± 15.4 | 61.2 ± 9.9 | 33.3 ± 9.3 | 16.2 ± 3.6 |
WOB (J/minute) | <0.001 | 4.9 ± 1.0 | 3.8 ± 1.7 | 1.2 ± 0.6 | 0.0 ± 0.0a |
PTP (cmH2O s/minute) | <0.001 | 106.1 ± 18.3 | 61.9 ± 21.8 | 16.3 ± 8.6 | 0.1 ± 0.1 |
P0.1 (cmH2O) | <0.001 | 2.0 ± 0.5 | 1.5 ± 0.3 | 0.9 ± 0.2 | 0.3 ± 0.2 |