Fig. 5
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40635-016-0103-4/MediaObjects/40635_2016_103_Fig5_HTML.gif)
Tidal airway P/V curves (red) starting from PEEP levels of 0, 4, 8, and 12 cmH2O and lung P/V curves (blue) starting from from ZEEP to end-inspiration at the highest PEEP level. Filled circles = end-expiratory airway P/V points. Note that the lung P/V curves have been transpositioned in parallel from their actual starting point at ≈5 cmH2O to zero to visualize that the slope of the lung P/V curve is identical to the slope of the end-expiratory airway P/V points (for actual position of lung P/V curves, see Fig. 7). Note that the lung P/V curve during PEEP inflation is unaffected by stiffness of the chest wall