What is the purpose of the pressure drop during exhalation in bi-level positive airway pressure?

The purpose of the pressure drop during exhalation in bi-level positive airway pressure (BiPAP) therapy is to provide increased comfort for the patient. In BiPAP, the machine delivers higher pressure during inhalation to help keep the airway open and facilitate breathing. When it's time to exhale, the pressure is reduced, which allows the patient to exhale comfortably and naturally. This decrease in pressure is essential for preventing airway obstruction and can also reduce the work of breathing, making the experience more tolerable and less restrictive for the patient.

By enhancing comfort through this pressure differential, patients are more likely to tolerate the therapy better, leading to improved adherence and overall effectiveness in conditions such as obstructive sleep apnea. The comfort during exhalation is crucial since continuous positive airway pressure (CPAP) can sometimes feel uncomfortable, making BiPAP a preferable option for some patients.