What is a key difference between CPAP and BiPAP airflow?

Choice A rationale While BiPAP is often used for more complex conditions, this is not a key difference in airflow. The primary distinction lies in how the pressures are delivered. BiPAP provides two distinct pressure levels, whereas CPAP provides a single continuous pressure. The application is a result of the pressure delivery difference. Choice B rationale The key difference is that BiPAP provides two distinct pressure settings: a higher pressure during inhalation (IPAP) and a lower pressure during exhalation (EPAP). This dual-pressure system makes breathing easier and is more comfortable for some patients, particularly those with conditions like obstructive sleep apnea or COPD. Choice C rationale This statement is incorrect. CPAP, by its definition, delivers a constant, single pressure throughout both inhalation and exhalation. It is the BiPAP device that provides two different pressure settings, distinguishing it from CPAP. CPAP maintains a positive pressure to prevent airway collapse. Choice D rationale This statement describes the function of a different modality, often called expiratory pressure relief (EPR) or similar technologies, which can be found in some CPAP devices. BiPAP, on the other hand, delivers two specific, set pressures, IPAP and EPAP, which are the fundamental differentiating features of the technology.