I'm not sure about any handy tutorials, and I'm also not sure which "this" you mean in the first sentence... however,q49q49 wrote:Can you point me to any tutorials to help me understand how this all should work? I think I understand basic CPAP. I don't understand how "plain vanilla" BiPap works well enough to explain it to my husband. The Auto SV seems like fuzzy logic. I'm looking forward to getting Sleepyhead installed and to start looking at data. I'm an ex-engineer and my husband is a technical person too. If I can explain to him what the machine is trying to do, it will go a long way to help him adjust to it.
basic plain vanilla bilevel (bipap from respironics, vpap from resmed) is VERY simple... *ALL* that means is that there are different pressures for inhaling and exhaling, for instance a setting of 14/10 means 'when inhaling, the pressure goes to 14, when you exhale, the pressure drops to 10". that's all there is to it. it makes it easier to inhale and exhale, you've got a bit of a boost for the inhalation, and it's easier to exhale against the lower pressure.
I'm not sure if I'd call the autosv fuzzy logic or not, (I'd have to go remind myself exactly what that means) but what it does, essentially, is calculate what the average minute ventilation is for the user, and then if it sees that starting to drop, it increases the inhale pressure, sometimes by a lot, to basically force air into the lungs.
lots of newbies get all hyperbolic about their cpaps "forcing air into them"... something cpaps NEVER do... AutoSV machines, however, actually DO do that, which is how they treat central apneas.
I thought I'd seen a video on youtube about what ASV (what respironics calls autosv) and how they work, but I can't find it... I did find this info that may be helpful
https://www.resmed.com/assets/documents ... ow_eng.pdf
also, while it may be overly technical (y'all will have to judge) I found these, about ASV in general:
https://www.youtube.com/watch?v=P1lrr0BrE94
https://www.youtube.com/watch?v=d35qx0A3PAg
the guy has a fairly heavy accent, but there are english subtitles.
also, here's a video I saw that I'd watched sometime back when I was educating myself on bilevel theory: (also rather technical)
https://www.youtube.com/watch?v=A-SlO2dU8Og
as well as this one: https://www.youtube.com/watch?v=BdeOiDJmbrk
let me know what other questions you have