CPAP devices are an effective therapy for patients with compromised alveoli. During the inspiratory phase of respiration, oxygen-rich gas is supplied at flow rates high enough to increase airway pressure. During the expiratory phase, the patient exhales against a resistance called Positive End Expiratory Pressure (PEEP). The combination of positive inspiratory and positive expiratory pressure can help reduce the work of breathing and improve alveolar gas exchange.
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