Fig. 5

Triggering characteristics in volume assist-control ventilation for a P0.1 of 4 cmH₂O. The figure illustrates the triggering efficiency for each ventilator tested during assist-control ventilation using the Michigan test lung to simulate spontaneous breathing. A moderate effort was achieved, corresponding to a decrease in airway pressure 100 ms after occlusion (P0.1) of 4 cmH₂O was achieved. A PEEP of 10 cmH₂O, a compliance of 20 and 50 ml/cmH₂O and a resistance of 15 cmH₂O/l/s were selected. Triggering Delay (TD, ms) and Pressurization Delay (PD, ms) were computed. A definition of TD and PD is available on Fig. 1. Triggering function was considered safe and acceptable when TD was less than 100 ms. *p < 0.005 for TD when comparing each transport ventilator with the Engstrom ICU ventilator (ANOVA test: global F was significant). ^Δp < 0.005 for PD when comparing each transport ventilator with the Engstrom ICU ventilator (ANOVA test: global F was significant)