Positive end-expiratory pressure (PEEP)
is a term used in mechanical ventilation
to denote the amount of pressure above atmospheric pressure present in the airway at the end of the expiratory
cycle. The equivalent in a spontaneously breathing patient is CPAP
. PEEP is set on the ventilator.
PEEP improves gas exchange by preventing alveolar collapse, recruiting more lung units, increasing functional residual capacity
, and redistributing fluid in the alveoli
due to the following: