APAP stands for Automatic Positive Airway Pressure. It is often also referred to as Auto-CPAP. The air it provides is still continuous but the pressure is variable. This variable pressure ability makes some call it a VPAP for Variable Positive Airway Pressure.
An APAP machine is the only option for those who have not had a titration in a clinic. A patient's fixed pressure is required to be programmed into a CPAP machine, so if this optimum pressure has not been established for you, APAP is what you need. The reason APAP is more expensive than CPAP is because of the built-in technology which monitors your pressure needs. With this ability the Auto-CPAP can adjust the pressure as and when you need it, through the night and over time.
APAP has several advantages over traditional CPAP. Fixed pressure CPAP often require follow-up overnight sleep clinic studies every 6 to 12 months. At these follow-ups, the sleep tech will verify whether the machine's programmed pressure is still adequate. An APAP changes the pressure as your needs change, without the need for clinician involvement. So, for example, when you anticipate weight loss you can expect your pressure needs to drop because of the reduced obstruction in your throat. An APAP will adjust automatically without the need for yet another visit to the hospital.
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