Positive End Expiratory Pressure (PEEP) keeps the alveoli partially inflated at the end of exhalation, preventing them from collapsing and preserving functional residual capacity. By maintaining this baseline pressure, PEEP stabilizes alveoli, improves oxygenation, and significantly decreases atelectasis formation, especially in conditions like ARDS, sedation, anesthesia, or prolonged ventilation. #EMT #Paramedic #Nurse | Rescue Academy