Time delay, non-triggering inspiratory efforts, and autocycling episodes at each sensitivity setting during NPV in normal subjects and patients with COPD
| Normal subjects | Patients with COPD | |||||
|---|---|---|---|---|---|---|
| NPVtr50 | NPVtr75 | NPVtr100 | NPVtr50 | NPVtr75 | NPVtr100 | |
| TDtr=time delay between the onset of inspiratory flow and the start of assisted breathing; NonTrEf=non-triggering inspiratory effort (% of total breaths); Autocycling=ventilator autocycling episode (% of total breaths); tr50, tr75, tr100=trigger sensitivity set at 50%, 75%, and 100% of maximum sensitivity. | ||||||
| TDtr (s) | 0.29 (0.02) | 0.25 (0.01) | 0.21 (0.01) | 0.30 (0.02) | 0.25 (0.01) | 0.21 (0.01) |
| NonTrEf (%) | 8.2 (1.8) | 3.4 (0.9) | 1.2 (0.1) | 11.8 (2.2) | 6.2 (1.1) | 2.5 (0.4) |
| Autocycling (%) | 0.0 (0.0) | 0.8 (0.5) | 2.6 (0.7) | 0.0 (0.0) | 1.0 (0.5) | 2.7 (0.7) |