I have been using my Devilbiss DV64 CPAP machine for just over 5.5 years with the same pressure settings & with an average nightly AHI over that period of around 2.5. Lowest 0.5, highest (on just one occasion ) of 4.75.
This suddenly changed a couple of days ago - quite dramatically! I am wondering whether it's me or the machine. Not really sure how I would tell. The machine still appears to be working as usual. No strange noises, filter not blocked. Mask leakage still being reported as 0.0% as always. I use a nasal mask & sometimes mouth breathe a bit, but I don't think any more than I've ever done since commencing CPAP use.
My initial pressure prescription was 8cmh2o & I have had the machine set to a range of 8cmh2o to 9.5cmh2o pretty much since I got it.
I have included 3 charts below. From 6th, 8th & 9th of November.
The 6th November was an 'average night' with an AHI score of 2.14.
The 7th November is the first time in over 5 years I missed using the machine for a night. I was pretty sick, struggling with a Crohns disease related bowel blockage that evening (so not a respiratory condition). This had resolved by the following morning.
The 8th November, I had the highest AHI score I've ever had on the machine of 5.89. This surprised me, I didn't feel like I'd had a bad night's sleep.
Last night, 9th November my AHI score rose to 10.1. I still don't feel like I had a bad night's sleep.
As you might imagine I am puzzled & concerned about why the sudden rise. I would very much welcome informed thoughts from those of you with experience in interpreting the OSCAR graphs.