Dynamic intrinsic PEEP and partitioning of diaphragm effort in patients with acute exacerbation of COPD during NPV
| Partitioning of diaphragm effort | ||||
|---|---|---|---|---|
| PEEPi (cm H2O) | PTPdipeepi (cm H2O.s) | PTPdiTr (cm H2O.s) | PTPdiPost (cm H2O.s) | |
| Values are mean (SE). NPV=negative pressure ventilation; NEEP=negative extrathoracic end expiratory pressure; tr50, tr75, tr100=trigger sensitivity set at 50%, 75%, and 100% of maximum trigger sensitivity; PTPdi=pressure/time product of the diaphragm; PEEPi=dynamic intrinsic positive end expiratory alveolar pressure; Tr=trigger phase; Post=post-trigger phase. | ||||
| NPVtr50 | 3.9 (0.6) | 2.1 (0.4) | 1.4 (0.2) | 7.5 (1.6) |
| NPVtr75 | 3.6 (0.5) | 1.7 (0.3) | 1.0 (0.1) | 6.1 (1.2) |
| NPVtr100 | 3.7 (0.4) | 1.8 (0.3) | 0.8 (0.1) | 5.4 (1.1) |
| NPV-NEEPtr50 | 1.8 (0.4) | 0.9 (0.3) | 1.0 (0.1) | 7.0 (1.5) |
| NPV-NEEPtr75 | 1.8 (0.3) | 1.0 (0.3) | 0.8 (0.1) | 5.9 (1.0) |
| NPV-NEEPtr100 | 1.9 (0.4) | 0.7 (0.3) | 0.6 (0.1) | 5.8 (0.9) |