12-08-2013, 07:29 AM
(This post was last modified: 12-08-2013, 07:56 AM by me50.)
I am attaching screen prints from ResScan and SleepyHead.
In ResScan it shows an unknown event that I don't recall seeing before and wondered if anyone else has seen this in their data.
Sleepyhead did not show it. The leaks are different in ResScan than they are in Sleepyhead (just an observation).
Looks like the two "Unknown Apneas" are both scored in a super-short session that happens well before 22:00.
The SleepyHead data starts at 22:40ish. If I recall, the default settings in SH are set to ignore really short sessions---as in sessions that last less than something like 2-5 minutes. If you have not changed your SleepyHead preferences, that's my guess as to why the "Unknown Apneas" are not showing up in SH: SH is just ignoring that session since it's so short. And since the session is ignored, all the data from the session is suppressed in the SH report.
As to the meaning of an "Unknown Apnea" in ResScan: The FOT algorithm for distinguishing between OAs and CAs is not perfect, and sometimes the data from the FOT test is so ambiguous that the S9 simply does not want to "guess" whether the apnea was an OA or a CA. In that case, the apnea is scored as an "Unknown Apnea" in ResScan; it typically shows up as an "Apnea" in SH. While UAs are most likely to be scored when the Leak Rate is well above 24 L/min, they can be scored at much lower leak levels.
Hi me50. An unknown apnea is just that - the machine wasn't able to determine if it was obstructive or central. Possibly a mix of both? I've seen a few from time to time, but not many. I notice the event occurs before 22:00 but the SH trace starts at 22:40 - if you zoom out, does it show up on SleepyHead? Also notice that there only seems to be a few minutes of mask time around the event, so it might even have been something while you were still awake.
In any event, it looks like your apnea is under control, with an AHI of zero. I know the AHI isn't the be-all and end-all, but it's a very good place to start.
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