CPAP, APAP and bilevel: names are not prescriptions
PAP is a family of treatments that delivers air under pressure through a mask.
PAP is a family of treatments that delivers air under pressure through a mask. NHLBI distinguishes fixed-pressure CPAP, automatically adjusting APAP and bilevel PAP with different pressures during inhalation and exhalation. These labels describe how a device works; they do not tell a reader which treatment is appropriate for their diagnosis or other health conditions.
A smaller machine or a more expensive mode is not automatically a better treatment. Begin with the clinician’s prescription and ask which exact device, interface and follow-up arrangements are required. PAP is not an oxygen concentrator, and ordinary sleep-apnea equipment is not interchangeable with a prescribed ventilator. Supplemental oxygen, when prescribed, requires its own approved arrangement.
If dryness, leaks, discomfort or persistent sleepiness make treatment difficult, discuss the problem with the care team. Keep the model name and a description of the problem available. This directory helps identify equipment and sources; it does not diagnose sleep apnea, select therapy pressures or tell you to change a prescribed mode.
Primary references
Original CPAP.buzz editorial analysis of the linked primary sources, checked 13 September 2026. Practical comparison points are editorial inferences; no hands-on testing or clinical evaluation was performed.
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