Fig. 3.

The occurrence of intrinsic PEEP can be observed on the screen of the ventilator from a patient with obstructive lung disease. (A) Airway pressure waveform with an expiratory pause showing the existence of PEEPI (or auto-PEEP). (B) Flow curve demonstrating the failure to exhale all gas during the expiratory time and, consequently, formation of gas trapping.

(In: Cordioli, R and Brochard, L, Respiratory system compliance and resistance in the critically ill, Oxford Textbook of Critical Care, ISBN: 9780198855439.)