ABSTRACT
The positive end-expiratory pressure (PEEP) represents the minimum airway pres sure applied throughout the respiratory cycle. Levels of 5 cmH20 are usually set to limit the development of atelectasis, particularly in patients receiving small tidal volumes (less than 10 mL/kg). In patients with pulmonary edema, higher levels of PEEP are used to recruit alveoli, prevent alveolar collapse, and improve oxygenation. PEEP and the fraction of inspired oxygen (Fi02) are the two settings that have the most effect on oxygenation.
