CPAP Machine Glossary
APAP – APAP stands for Automatic Positive Airway Pressure. APAP machines are a non-invasive treatment for sleep apnea that deliver pressurized and unobstructed air through a mask during sleep. The APAP has two range settings, low and high. The setting automatically adjusts based on the user’s needs using an algorithm.
ASV – ASV stands for adaptive servo-ventilation. ASV machines provide support during regular breathing, not just during sleep. Using algorithms, it intervenes when the user’s breathing has significant reductions or pauses.
BiPAP – BiPAP machines are a non-invasive treatment for sleep apnea that have two pressure settings: one for inhalation and one for exhalation. This allows for the users to have more lungs moving in and out of the lungs.
BiPAP ST – ST stands for spontaneous time and is a feature of the BiPAP that is activated when the user does not meet the minimum number of breaths per minute by triggering the user to take another breath.
BiPAP w/out Back Up vs. BiPAP w/ Back Up – A BiPAP (also referred to as a Bi-Level or VPAP) delivers two set pressures, a higher pressure for inhalation and a lower pressure for exhalation. BiPAP and BiPAP ST machines are similar, as they are both designed to provide the same airway pressure. The difference between a BiPAP and a BiPAP ST is the Spontaneous Timed feature. The ST responds to the user when the minimum number of breaths per minute has not been met. This machine ensures all breaths occur by triggering the user to take another breath within the minute.
BPM – Breath per minute
CPAP – CPAP stands for Continuous Positive Airway Pressure and are the most commonly used treatment options for people experiencing obstructive sleep apnea. CPAP machines deliver constant and pressurized air into the airways.
Data – The recording of in-depth information such as: apnea events, hypopnea events, changes in pressure, leak rates, information on snoring, and more.
EPAP – EPAP stands for expiratory positive airway pressure. It is pressure created during exhalation that stabilizes the upper airway, reducing snoring.
Hose – The hose delivers the pressurized air from the machine to the mask. It can be heated or unheated.
Humidifier – A humidifier adds moisture to the pressurized air to keep the user’s airways from drying out or becoming irritated.
IPAP – IPAP stands for inspiratory positive airway pressure. This is used in conjunction with EPAP. The combination of these two pressures is what characterizes BiPAP treatment.
Ramp – A ramp is a comfort feature that allows your machine to gradually build-up to the prescribed pressure, making compliance much easier.
You can read our Ultimate Guide to Buying a CPAP Machine to get all the pro tips for your CPAP therapy: