After two years of diminishing returns with a CPAP, I now use a BiPAP AutoSV (with an EncorePro card, but no reader, and no software, so no way to check AHI). The machine had only 800 hours on it when I bought it and started using it two months ago.
I now hate going to bed because I always end up in a breathing battle with the machine. The first few minutes are fine, but soon I'm trying to exhale while it's trying to force an inhale.
My strategy, after three studies, is to use it as a basic CPAP with IPAP = EPAP = 4.0 until breathing stops, at which time we want IPAP to jump to 16. But it jumps while I'm still awake! So it's trying to inflate me while I'm trying to exhale. It does this with BPM set as low as 7, and in Auto, too. Why would it see the need to exceed 4.0 even before I stop breathing?
I've timed my resting BPM (but not sleeping BPM -- I live alone) at about 8, which is slower than I expected, but it's accurate. Also, I have a natural pause between the end of an exhale and the start of an inhale, but the very microsecond I finish an exhale, and often just before I finish it, the machine is blasting air into me. It apparently thinks I should breathe faster and faster.
Could this contest be due to a faulty pressure sensor? Or, more likely, operator error?
I will surely welcome your sage advice and am willing to serve as an experimental lab rat for as long as it takes, as I am very much Out Of Sync! Thx!