Intrinsic positive end-expiratory pressure (PEEPi)

Recordings of airway pressure (P_aw), flow, and volume in a patient receiving controlled mechanical ventilation. After the third breath, the airway was occluded at end-expiration using the end-expiratory hold function on the ventilator. During the period of zero flow, pressure in the alveoli and ventilator circuit equilibrate, and the plateau pressure reflects auto or intrinsic positive end-expiratory pressure (PEEPi), indicated by the arrow.