The period during which a CPAP machine gradually increases air pressure from a low starting point to the prescribed therapeutic pressure is known as its initial pressure increase feature. This feature allows users to fall asleep more easily with lower pressure, then comfortably receive the full therapeutic pressure as they sleep. For example, a machine might begin at 4 cm H2O and slowly increase over 45 minutes to a final pressure of 12 cm H2O.
This gradual pressure increase improves comfort and reduces common issues like difficulty exhaling against high pressure when first falling asleep, claustrophobia, and aerophagia (air swallowing). This feature has become a standard inclusion on modern CPAP devices, contributing significantly to better patient compliance and successful therapy. Early CPAP machines lacked this comfort feature, making therapy initiation more challenging for some users.
