PEEP
Pronunciation: peep
Also written as: PEEP — Positive End-Expiratory Pressure
Positive end-expiratory pressure maintained during mechanical ventilation to improve oxygenation and prevent alveolar collapse.
Full Definition
Positive end-expiratory pressure (PEEP) is the pressure maintained in the airways at the end of expiration during mechanical ventilation, typically set between 5-15 cmH2O. In surgical critical care, PEEP helps recruit collapsed alveoli, improve ventilation-perfusion matching, and enhance oxygenation in patients with ARDS or other lung injuries. Higher PEEP levels may improve oxygenation but can reduce venous return and cardiac output. Optimal PEEP selection requires balancing improved oxygenation against potential hemodynamic compromise.
Usage
Usage note: Distinguish from CPAP (continuous positive airway pressure) used in spontaneously breathing patients.
In Context
- "Increase PEEP to 12 cmH2O to improve oxygenation while monitoring blood pressure." — Ventilator management order
- "High PEEP strategy improved PaO2/FiO2 ratio from 150 to 280." — Respiratory therapy note