Continuous positive airway pressure (CPAP) is a form of positive airway pressure ventilator, which applies mild air pressure on a continuous basis to keep the airways continuously open in a person who is able to breathe spontaneously on their own.

CPAP machines are used to treat both obstructive and central sleep apnea. In both disorders, your breathing is interrupted during the sleep cycle. This can occur hundreds of times in a single night, leading to a lack of oxygen and a higher risk for high blood pressure, heart disease, stroke, diabetes and other health concerns. A CPAP machine helps keep your airways open by delivering continuous air through your nose and mouth.