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User Flag #1 & #2
I wonder if someone would explain to me just what User Flag 1 & 2 mean and how they are are interpreted. I get alot of them, anywhere from 30 to 40 per night. I thought that anything over 10 seconds in the flow rate graph would be shown as an apnea or hypopnea. In the first attachment below I have a UF 1 that lasts 11 seconds and another one for 10 seconds. Why would they not show up as CA's ?


In the second attachment below I have a UF 2 that lasts 13 seconds . Why would that not be recorded as a hypopnea ?


There is obviously something I don't understand about the UF 1 & 2's so I would appreciate it if someone could educate me about them.
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The UF1 and UF2 stand for User Flag with the default being set to Flow Restriction 20% and 50% respectively. These values but may be changed, as well as the length in time. I renamed mine FR20 and FR50 so I could remember what they are.  These are events that are calculated by SleepyHead and not a registered event by the CPAP.  You can have a very low AHI and still feel tired. Reviewing these parameters may show that you are having little disturbances that are causing the tiredness.

They may be turned on/off by File->Preferences->CPAP->Custom CPAP User Event Flagging. To customize the labels, under Preferences->Events, then click on the label to invoke an edit box. This edit feature works on both the Name column and the Label column.
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I still don't quite understand why the UF 1 & 2 in my example would not be recorded as CA's and Hypopnea by CPAP when they are over 10 seconds long. What am I missing in my logic ? Is it that the flow restriction used by CPAP  is not the same as  the 20 and 50% used by Sleepyhead ?
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One point that may not be obvious is that Flow Restriction 20% (or 50%) means 'restriction down to 20% (or 50%) of prior flow'. This is evident from the fact that (in my charts, at least) UF2 (FR50) shows up much more often than UF1.

I haven't been able to come up with a short name that makes this clear.
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A CA is the absence of breathing without an airway occlusion.   An OA is the absence of breathing caused by an airway occlusion.  A Hypopnea is diminished breathing precipitated by a partially occluded airway.   A Hypopnea can be a precursor to an OA.
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