A fixed-pressure CPAP delivers the prescribed therapeutic pressure rather than continuously varying pressure through an automatic algorithm. For the right patient, that simplicity is not a disadvantage.
What does fixed CPAP do?
CPAP uses positive airway pressure to help keep the upper airway open during sleep. The NHLBI describes CPAP as a machine using mild air pressure to keep breathing airways open and notes that healthcare providers may help patients with pressure, masks and humidification. Source: NHLBI.
A fixed CPAP provides the established pressure during therapy. APAP instead varies pressure inside a prescribed range.
Is APAP clinically better?
Not as a general rule. The AASM recommends either CPAP or APAP for ongoing PAP treatment in adults with OSA. The relevant question therefore is not which label sounds more advanced, but which mode is appropriate for the individual treatment plan and is usable consistently. Source: AASM PAP guideline.
What features still matter on a fixed CPAP?
Useful comparison points include ramp or other documented comfort functions, humidification, therapy-data reporting, mask compatibility, filter and water-chamber availability, warranty, local service and power requirements. Exact features vary by model and should be checked against current manufacturer documentation.
When should treatment be reviewed?
Persistent sleepiness, discomfort, major leaks, inability to tolerate therapy, worsening symptoms or concerns in therapy data deserve appropriate follow-up rather than an unsupported pressure change. The AASM emphasizes adequate follow-up, troubleshooting and monitoring of PAP efficacy and usage after treatment begins.
See CPAP vs APAP, the Auto CPAP buying guide and Respmart's CPAP & APAP collection.
Frequently asked questions
Is fixed CPAP outdated?
No. Fixed CPAP remains an evidence-supported treatment mode for adult OSA.
Should I replace a working fixed CPAP with APAP?
Not simply because APAP is newer or automatic. Discuss treatment performance and any reason for changing mode with your treating professional.
Can a fixed CPAP provide therapy data?
Some models can. Data capabilities vary by device, so confirm the exact model specification.
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