New AVAPS User Problems (Revised Post)

[jmayer180]

After a follow-up sleep study I finally got my new PR System One BiPAP AVAPS. With my previous BiPAP Auto I had been getting CA's about double my OA's with total AHI's in the twenties, and with IPAP 25, EPAP 20 (or as close as could be tolerated) with restless nights and sleepy days. My new prescription is for AVAPS, PC mode, tidal volume 800 (I'm 6ft 3in, and weigh far, far more than ideal weight), back-up rate 12, IPAP max 25, IPAP min 10, EPAP 10. I used the new AVAPS machine for the first time 4 Oct 2016. Subjectively I felt great, with comfortable breathing all night. Imagine my surprise when I ran the data and found my total AHI was 45! Last night, 5 Oct 16, was the same.
I think I have learned how to provide screenshots. Let's see:





Hoping the images come through, one question concerns my tidal volume. I see some are as low as 300-400. I thought the whole idea of AVAPS was to guarantee a minimum tidal volume, 800 in my case?

It'll be some time before I can get a follow-up with my sleep doc. Meanwhile does anyone have suggestions?

[palerider]

IPAP max 25, IPAP min 7 (do I misunderstand that IPAP min cannot be less than EPAP?), EPAP 10.

IPAP = upper pressure, EPAP = lower pressure.

upper can't be less than lower. perhaps there's some confusion about the settings.

Meanwhile does anyone have suggestions?

absent any actual information, suggestions would be a bad thing for anybody to give, or you to listen to.

[raisedfist]

edit: i wasn't able to see the images you uploaded while at work.

target tidal volume means you will have dips below and above the target, and the pressures adjust via the algorithm to maintain an average so you are not under or overshooting the target value.