CPAP vs BiPAP: Which Therapy Is Right For You?

CPAP (Continuous Positive Airway Pressure) and BiPAP (Bi-level Positive Airway Pressure) are both gold-standard treatments for sleep-disordered breathing, but they serve different clinical needs. Understanding the difference helps you and your doctor choose the right device — and avoid paying for features you don't need.

CPAP delivers a single, constant pressure throughout the breathing cycle — both inhalation and exhalation. It is the first-line treatment for obstructive sleep apnea (OSA). Auto CPAP machines (APAP) go one step further, automatically adjusting pressure breath-by-breath using algorithms that detect apnea events in real time, offering higher comfort than fixed-pressure models.

BiPAP delivers two pressure levels — a higher IPAP (inspiratory positive airway pressure) for inhaling and a lower EPAP (expiratory positive airway pressure) for exhaling. This two-level support is significantly more comfortable for patients who struggle to exhale against high CPAP pressure, and is clinically indicated for central sleep apnea, complex apnea, and hypoventilation syndromes including COPD and obesity hypoventilation.

If your sleep study (polysomnography) shows an AHI (apnea-hypopnea index) above 5 with predominantly obstructive events and no hypoventilation, CPAP is likely sufficient. If your AHI includes central events, your respiratory rate is elevated, or you have neuromuscular disease, your pulmonologist will typically prescribe BiPAP. Never switch between therapies without medical guidance.

Both device types require proper mask fitting and regular maintenance. Masks come in nasal pillow, nasal, and full-face varieties — the right choice depends on whether you breathe through your nose or mouth during sleep. Our team provides free mask-fitting consultations and can demonstrate both CPAP and BiPAP operation before your purchase.