Although unwise to speculate without data; I'll hazard a guess that pain meds are causing central apnea. The data will tell.
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WELCOME! to the forum.!
You have come to the right place for help.
I wish you much success as you continue your CPAP therapy and getting your machine set up to better meet your needs.
Hang in there for more responses to your post.
Blehmeir, it's possible that you have complex apnea with central apnea events. If so, the simple bilevel can't help, but there is a machine that can. You need to know what kind of apnea events you are having.
There are a few choices to get the data. Sleepyhead software is best. See the link at the top of this page, and load it on your computer. It will read the data on your machine's SD card. Or, look at the sleep results data on your machine's screen. Your machine may be setup for "Essentials" reporting. If so, we will need to go into the settings to change that to Plus. Let us know what you see.