Fig. 6
Relative expiratory decrease in tidal volume during the previously defined sections using the electrical impedance tomography (EIT) for volume-controlled baseline ventilation (BL), volume-controlled ventilation (VCV) and flow-controlled ventilation (FCV). In brief: the decline in global electrical thoracic impedance was separated into four equal sections (ΔEI25, ΔEI50, ΔEI75 and ΔEI100) (compare Fig. 5) and matched with the tidal changes simultaneously. On each box, the central mark indicates the second quartile, the bottom and top edges indicate quartiles (25th percentile and 75th percentile). On each box, the whiskers indicate the most extreme data points. Outliers are plotted individually (‘+’). * = p < 0.001 for baseline vs. FCV and VCV vs. FCV, x = p > 0.05 for baseline vs. FCV and VCV vs. FCV. Linear mixed effect model analyses were used to check for differences between the ventilation phases using R based software (jamovi project 2018, version 0.9.2.3). The randomization had no significant effect on the measured difference in end-expiratory lung volume between the ventilation phases