Fig. 2.

Differences in inspiratory delays (delay time P_tr − delay time N_tr) during NIV with a pressure support of 5, 10 and 20 cm H₂O and respiratory rates of 10, 20 and 30 bpm were shown. During all combinations of respiratory rates and pressure support levels, there was a significant difference in inspiratory delays being highly increased during pneumatically triggered NIV. Symbols represent group median values and the bars indicate 25th and 75th percentiles. Delay-on inspiratory delay between the onset of the volunteers’ inspiratory effort and the start of the ventilatory support, P _tr pneumatic trigger, N _tr neural trigger, NIV non-invasive ventilation