Continuous positive airway pressure (CPAP) therapy is a common treatment for obstructive sleep apnea. A CPAP machine uses a hose and mask or nosepiece to deliver constant and steady air pressure.

Bilevel positive airway pressure (BiPAP) therapy is often used in the treatment of chronic obstructive pulmonary disease (COPD). COPD is an umbrella term for lung and respiratory diseases that make ...