What is the difference between a CPAP machine and a BiPAP machine

A CPAP machine delivers a constant flow of air through a face mask, which is worn while a patient sleeps, according to About.com. A BiPAP machine has two air pressure settings, one for inhalation and one for exhalation, and the air pressure is lower during exhalation.

Depending on the patient's symptoms, either CPAP or BiPAP is prescribed to treat sleep apnea. Symptoms of sleep apnea include snoring, daytime fatigue and periods of interrupted breathing during sleep, called apnea, notes Mayo Clinic.

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