Twitch pressures and respiratory system mechanics in 13 critically ill mechanically ventilated patients
| Patient no | Paw tw (cm H2O) | Poes tw (cm H2O) | Pdi tw (cm H2O) | Total PEEP (cm H2O) | Resistance (cm H2O/l/s) | Compliance (ml/cm H2O) | Time constant (s) |
|---|---|---|---|---|---|---|---|
| Paw tw=airway twitch pressure; Poes tw=oesophageal twitch pressure; Pdi tw=transdiaphragmatic twitch pressure; PEEP=positive end expiratory pressure. | |||||||
| 1 | –17.3 | –15.9 | 28.2 | 7.3 | 16 | 64 | 1.00 |
| 2 | –6.2 | –5.7 | 7.4 | 4.7 | 16 | 68 | 1.07 |
| 3 | –14.6 | –12.2 | 16.5 | 5.2 | 10 | 62 | 0.59 |
| 4 | –4.7 | –4.4 | 10.4 | 6.1 | 21 | 72 | 1.55 |
| 5 | –7.6 | –7.3 | 11.6 | 6.3 | 22 | 40 | 0.86 |
| 6 | –2.8 | –3.6 | 4.3 | 6.1 | 15 | 65 | 0.98 |
| 7 | –5.4 | –2.9 | 4.4 | 6.1 | 15 | 64 | 0.98 |
| 8 | –8.9 | –5.3 | 7.0 | 8.0 | 10 | 55 | 0.57 |
| 9 | –10.6 | –11.3 | 12.8 | 7.9 | 16 | 65 | 1.04 |
| 10 | –11.8 | –10.7 | 12.1 | 6.4 | 15 | 58 | 0.87 |
| 11 | –4.7 | –5.0 | 6.8 | 5.4 | 11 | 48 | 0.53 |
| 12 | –5.0 | –4.6 | 4.6 | 7.2 | 16 | 62 | 0.97 |
| 13 | –6.6 | –6.0 | 9.3 | 6.9 | 12 | 57 | 0.70 |
| Mean | –8.2 | –7.3 | 10.4 | 6.4 | 15 | 60 | 0.90 |
| SE | 1.2 | 1.1 | 1.8 | 0.1 | 1 | 2 | 0.08 |