Which statement differentiates BiPAP from CPAP?

Which statement differentiates BiPAP from CPAP?

• A. CPAP provides two pressures during inspiration and expiration; BiPAP provides one continuous pressure
• B. CPAP delivers higher oxygen than BiPAP
• C. BiPAP provides two pressure levels (IPAP/EPAP); CPAP provides continuous pressure
• D. BiPAP is only used for sleep apnea

Answer: (C)

The main point is how the pressures are delivered. CPAP maintains a single, continuous positive airway pressure throughout both inhalation and exhalation. BiPAP, on the other hand, uses two different pressure levels: a higher pressure during inspiration to help push air into the lungs (IPAP) and a lower pressure during expiration to keep the airway open without making exhalation too hard (EPAP). This difference matters clinically because the two-pressure setup of BiPAP can assist ventilation by augmenting tidal volume and reducing the work of breathing, while CPAP simply keeps the airway open with a constant pressure. CPAP is commonly used for obstructive sleep apnea with a steady pressure, whereas BiPAP is helpful when a patient needs more assistance with inhalation or has difficulties exhaling against a constant load, such as in COPD or certain respiratory failures. Oxygen delivery can be added to either system, so choosing between them isn’t about delivering more oxygen but about how the pressure is patterned across the breathing cycle.

The main point is how the pressures are delivered. CPAP maintains a single, continuous positive airway pressure throughout both inhalation and exhalation. BiPAP, on the other hand, uses two different pressure levels: a higher pressure during inspiration to help push air into the lungs (IPAP) and a lower pressure during expiration to keep the airway open without making exhalation too hard (EPAP).

This difference matters clinically because the two-pressure setup of BiPAP can assist ventilation by augmenting tidal volume and reducing the work of breathing, while CPAP simply keeps the airway open with a constant pressure. CPAP is commonly used for obstructive sleep apnea with a steady pressure, whereas BiPAP is helpful when a patient needs more assistance with inhalation or has difficulties exhaling against a constant load, such as in COPD or certain respiratory failures.

Oxygen delivery can be added to either system, so choosing between them isn’t about delivering more oxygen but about how the pressure is patterned across the breathing cycle.