JIMCHI wrote:Why doesn't it show CA ??
Because ResMed in their infinite "wisdom" doesn't separate central apnea events from obstructive apnea events on their ASV AirCurve model machines.
They never have for whatever reason they decided to do things that way.
With the AirCurve ASV types of machines (not the plain AirCurves that are just regular bilevel machines) there is just an Apnea event category and a Hyponea event category.
Since SleepyHead is used to having separate categories for OAs and Centrals/CA when the ASV type of machine is used SH doesn't know what to call the events that are in the Apnea Event category so they get called unknown apnea events when using SleepyHead.
If you were using ResScan those "unknown/unclassified" events would just be in the Apnea Event category with no separation into central or OA subclassification.
So we don't ever really know if those "Apnea events" are obstructive or central when using the ResMed ASV type of machine. We assume that they are probably obstructive since if they are a central the machine is suppose to deal with them so they don't happen but I never could find out exactly for sure if that is what we see. When this has happened in the past and a person had a lot of "unknowns" we usually treated with more pressure minimum and they would go away or reduce so that tells us that they were obstructive since they responded to an increase in the minimum pressure (EPAP).
I have a ResMed ASV type of machine...and I have both SleepyHead and ResScan and when comparing the data results....Apnea Index in ResScan always matches the "UA" index in SleepyHead.
Hyponeas are always separate anyway.
I always thought it was kinda stupid to have a machine that treats centrals not flag them separately but that's what is happening with the ResMed ASV type of machines but no one ever asked me my opinion on why they decided to do that.
Now Respironics ASV machines do flag centrals and obstructives separately.
So....after all that...if the UA/Apnea Index is really low...whatever they are there's not very many of them happening and therapy is working and we shrug our shoulders and move on.
Hyponeas are almost always obstructive in nature though.