Table 2 Assistance levels in each experimental condition
Mode, assistance setting | Level50 | Level100 | Level150 | Notes |
|---|---|---|---|---|
PSV, inspiratory pressure (cmH2O) | 7.0 (7.0-7.2) | 14.0 (11.5-15.2) | 21.0 (17.2-21.7) | The inspiratory pressure support level, set by the clinician, is kept constant regardless of the mechanical properties of the lung/thorax and patient effort. |
NAVA, NAVA level (cmH2O/μV) | 0.6 (0.4-0.9) | 1.3 (0.8-1.8) | 1.9 (1.2-2.7) | The NAVA level is a proportional gain factor expressed in cmH2O/μV of EAdi. It represents the magnitude (in cmH2O) of positive airway pressure applied per μV EAdi during the course of each inspiration. |
PAV, proportion of assistance (%) | 27 (25–35) | 55 (50–70) | 82 (75–95) | The proportion of assistance is the percentage of work provided by the ventilator. The rest of the work is provided by the patient. |