How to eliminate a long OA cluster with CSR

[Roy289]

My normal AHI is below 5 but over the last few days I'm getting long clusters of OA(79) mixed with a CSR which has driven AHI to 12.51.  See attachments.

Background:  I use pressure range of 7 thru 10.  Above 10 I experience aerophagia.  A side sleeper.  Interested to know what caused this long  string of OA.  Usually events are CA but often during the period  I wake up.

I use a Resmed Full hybrid mask  F30i

   

   

[staceyburke]

When you have grouped O or H events you are having positional apnea. Positional apnea is when you sleep in a position that cuts off your airway.

No pressure changes can help - you must find a way not to get into that position. It is Alison called chin tucking where your chin drops down to your Sternum cutting off your airway.

It may be just a one time thing, like sleeping on your back or sleeping with higher pillows.

If you can’t stop getting into that position you may need to wear a collar to keep your chin up.

Please look at the link I have in my signature on collars. In that link it show people without a collar and the same people with a collar. HUGE DIFFERENCE

[Gideon]

That is positional apnea.
You have no CSR as you are having no CA events in all that periodic breathing. OSCAR calls it "CSR" only because that is what the manufacturer ResMed calls it.

[Roy289]

Thanks for the quick replies. I thought as well that this was positional apnea. When I received the F30i as a side sleeper I found the front air vents would vent cold air directly onto my arm. To avoid this I began to position the top bedsheet to cover my arm this resulted in clusters of OA but not as long as the one in my post. I reasoned that this was caused by the bedsheet blocking the mask vent which caused mild hypercapnia. Last night I ensured that the bedsheet was away from my upper body and the OA events disappeared completely. I need to see if this a solution or manage the suspected chin tuck.