Fig. 3.

Differences in expiratory delays (delay time P_off − delay time N_off) during NIV with PSV 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 expiratory delays that were highly increased during pneumatically triggered NIV. Symbols represent group median values and the bars indicate 25th and 75th percentiles. Delay-off delay between the onset neural end of inspiration and the end of the ventilatory support, P _off pneumatic cycling-off, N _off neural cycling-off, NIV non-invasive ventilation