What is the role of the EPAP setting in a BiLevel device?

The role of the Expiratory Positive Airway Pressure (EPAP) setting in a BiLevel device is primarily to maintain airway patency during exhalation. It works by providing a certain level of pressure on exhalation, which helps keep the airway open and reduces the risk of airway collapse, particularly in patients with obstructive sleep apnea. This is crucial for preventing hypopneas and apneas that can lead to desaturations in oxygen levels and cause arousals during sleep.

By maintaining airway pressure during exhalation, EPAP consequently contributes to improved oxygenation and stable breathing patterns, ultimately reducing the likelihood of desaturations and sleep interruptions. This supportive role helps enhance overall sleep quality and duration by minimizing disturbances caused by airway obstruction. Thus, the correct choice addresses its fundamental purpose in optimizing respiratory function during sleep therapy.