Different XPAPs report different # of events / AHI ???

HI everyone,

Does anyone know if the sleepyhead data produced/recorded by XPAP can vary by machine ?

To explain, I had a respironics CPAP for 4 years and my AHI was consistently around 1 or less. Still felt really tired all the time, so I purchased a Bipap dreamstation. Tried all different bipap settings over the past 6 months or so but my AHI was always higher than before (around 2-3). Plus, still feel tired.

Finally tried the same settings on the new machine that I had previously -- i.e. tried the Bipap on CPAP mode for about a week with same pressure settings I had been using for years previously. Turns out, the AHI reported by the dreamstation is still much higher than it was on the old machine.

Possible explanations -- 1) either the dreamstation, a newer machine, is better at sensing events, 2) the dreamstation cpap pressure settings -- although equal on paper / according to the machine -- are not the same b/w the two machines (unlikely), or 3) ???

Anyone have an explanation for this ? I'd like to optimize my therapy, but need to be able to rely on the event reporting to do that.

Welcome to the forum.

So exactly which Respironics CPAP machine did you use for 4 years there's a bunch of different model lines as well as models?

So what was the AHI category breakdown into each event category with the old machine and now with the new machine?
There's more to it than just overall AHI.
Where are you getting the numbers now....using software or off the machine's LCD display?
In general if you went from the System One model line to the DreamStation model line I wouldn't expect to see much variance in reported results assuming all the settings were identical but I would need to see the reports themselves as well as the settings to see what might be going on. Sometimes something as little as a Flex exhale relief setting could cause a difference in results.

It's also possible that you not feeling so great with the older machine and low AHI isn't from something that is related to sleep apnea.
A low AHI doesn't guarantee that we will feel those good numbers because often there are other causes for not feeling so great that are unrelated to sleep apnea and the machine can't fix problems that are unrelated to sleep apnea.

Do you know about the available software? If not, learn about it and get it.
https://sleep.tnet.com/equipment

post some images and let us see what you are seeing...maybe we can spot something that could be improved upon.
viewtopic/t158560/How-to-post-images-for-review.html

Instead of worrying about the difference in AHI (heck, maybe your old machine was starting to fail) let's work with what you have now and try to figure out if there is something that could maybe be tweaked to give you a better chance of feeling better.