My overnight sleep study titrated to 20cm H2O and woke me up violently at the hospital. Apparently although my AHI was low to moderate when I was at REM sleep everything collapsed and hence 20cmH2O. A further 2 weeks home titration resulted in advice of 16.8cm H2O.
The initial month of 16.8 with the FFM resulted in severe aerophagia and nightly chipmunk cheeks. I would wake up feeling like my face was in a wind tunnel. I felt the high pressure came whoosing out of my open mouth, not escaping fast enough and would lodge in my chipmunk cheeks. If my sleep was not so fragmented with severe exhaustion I would have found it all so funny.
So I am with Opal Rose in saying that mouth breathing with the FFM is not the way to go. In fact it was only with slowly learning to keep my mouth closed so all pressurised air was channeled to my airways that my therapy started to succeed. With that, I looked to lowering pressure slowly as an aide to perhaps more comfort and also reducing leaks. OK, so the neck collar worked for me and I learned to stick my tongue to the roof of my mouth. I do that as I fall asleep. At times I do still wake up to find my tongue down but in the main, it has worked.
Chins straps have worked for others and also filled sock rolls have been suggested too as aides to keep mouth shut. For me the neck collar also serves to align my head/neck to keep airway open.
Do give your self time to get over the effects of the operation before making conclusions on PAP.
Beginner's Guide to SleepyHead
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