Aircurve10 ASV: Sleepyhead v ResScan UA's are OA's
in case the image insert failed..Versions of each noted in the screen shot.
Screenshot is dual monitor, ResScan on left, SH on right..
also note - area shown is while machine was in auto ASV.. was changed back to 'prescription values' (shown) at 7am ish
Around 00:50 - 00:51 in REM, but upper airways closed for a minute.. Machine tries to actively ventilate : no flow with pressure change.
after a minute patient breathes with a snort, gasps and closes airways with his fat tongue.. repeat.
Please try to avoid the diagnosis.. I want to first drill into what is actually being reported in the data and why it reports as unknown in sleepyhead instead of obstructed.
RE: Aircurve10 ASV: Sleepyhead v ResScan UA's are OA's
Mike, the ASV does not use the FOT (forced oscillation technique) to determine the type of apnea. All other Resmed machines do this except the lowest end CPAP. The reason is that the machine must assume each apnea is a central in order to deliver a timely application of pressure support to keep central patients breathing. Since it does not probe the airway with FOT, it classifies the apnea as "unknown", but most of the time we can assume it is obstructive because of the lack of response to PS.
RE: Aircurve10 ASV: Sleepyhead v ResScan UA's are OA's
The current
ResScan glossary doesnt have an "UA - unknown apnea" called out - unless of course I missed it.. ResScan doesnt type identify it either apparently like it does with hyopnea.. apparently.. There is probably an event code which Sleephead is lumping into the UA category. Sleepyhead is easier to use, thats for sure..
There's an older definition floating around the web saying that UA's are events which cant be categorized since they end in a "leak".. I'll try to remind myself not to gasp after seeping with my lungs deflated for a minute at a time
.. oh wait.. If I could do that, I probably could convince myself to quit forcefully shutting my airways so hard..
I see your point
here in the differences between the airflow and airsense 10 machines (search "CSA det")..
(Now I wonder if there is some magic that the "Sense" can do that the "Curve" cannot.. I doubt that any sane amount of air pressure could hold open airways which are "ordered" shut.. I still have to get a good baseline on myself.. less than a week on the machine.. I may run a camera from overhead to see if I'm doing an unexpected exorcist type head twist - which I doubt.. A closed airway between breaths seems reflexive to me ( not swallow, but breathe out and hold))..
RE: Aircurve10 ASV: Sleepyhead v ResScan UA's are OA's
None of the Curve machines do RERA either. No big deal, but some people like that. In your case the UA as obstructive has a lot of clues that show what it is, like the abrubt recovery breaths, and apnea commencing on exhale, rather than tapering. You really don't need a machine to tell you what it is, it just takes some practice; and some people find the FOT pulses disruptive. One more thing, the machine apnea classifications tend to be pretty good, but they are not infallible. It really helps to look closely at the flow line and make sure that the machine is getting it right and it makes sense.
07-31-2017, 04:53 PM
(This post was last modified: 07-31-2017, 05:07 PM by ajack.)
RE: Aircurve10 ASV: Sleepyhead v ResScan UA's are OA's
If you have positional obstruction and the airway is restricted eg. bringing your chin to your chest et al. The machine can't treat the apnea, even at it's max set pressure.