Fig. 4.

Applying intrinsic PEEP and measurement of the total PEEP to determine intrinsic PEEP. a Set-up used for this experiment with the flow restrictor and in-line PEEP on the expiratory limb of traject A to induce intrinsic PEEP. b Intrinsic PEEP as function of the applied flow restriction in the expiratory limb for the different ventilator settings, displayed with their expiratory time. The vertical bars represent an uncertainty resulting from the difference between the units of the pressure transducer (mmHg) and of the ventilator (cmH₂O)