What is the difference between a fixed and automatic pressure machine?

A Fixed pressure machine (CPAP) is set at a single therapy pressure calibrated through titration testing, these machines will start softly, allowing you to drift off to sleep, before raising up to your personalized therapy level and staying there the rest of the night. While they may be more budget-friendly compared to their automatic counterparts, it's important to note that regular re-testing is essential to keep your CPAP finely tuned to your theraputic needs.
An Automatic machine (APAP) operates within a wide range of pressures. The device will monitor your breathing throughout the night and adjust the airflow as needed to always keep your airways open. While they may be pricier, their adaptive nature is often worth the investment. Alcohol consumption, a change in medication or even just a little more stressed than normal, they can provide the extra air pressure you may require, unlike fixed pressure machines.