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[Diagnosis] Leak rate level and OA apneas between nasal and full face mask
Leak rate level and OA apneas between nasal and full face mask
Dear all,

after using for several years an OPUS 360 nasal mask, I started to observe that my sessions were not optimal due to mouth breathing (Chin straps do not really help since I feel that after testing 3 different shapes, I still get nexk pressure narrowing my airway). I switched into the full face dreamwear mask since my nose shape/size is not optimal for other types of full face masks. After a successful 6 month period and reduction of the AHI from the 3s region to 1-2s, I have not observed any substantial improvement. In fact I feel that air inserting from the nose requires now more effort, I get side leaks that wake me up (So, I added several types of mask liners to see if this can help with no apparent success). I purchased a hybrid mask from Respcare in an attempt to see if this will help me better...i.e., clear nasal pillows to have good air flow and a mouth piece that can compensate.

Looking at Oscar/Sleepyhead data I see that the leak rate for the nasal mask is way low and with the dreamwear is higher. So I have a few questions before I raise the issue where I will need your experience:

1) Do we focus only on the leak rate value or also the total leaks value? do you have any indication for a nasal, full face mask what leak rates will be considered not realistic indicating that I wear the mask not correct or mask silicone lost its flexibility?
2) Is it possible that the software reads " easier"  OAs with a nasal mask than with a full face mask (air is distributed in a larger area?). Or am I really experiencing more events with the nasal that with the full face purely due to the mouth factor?
3) with nasal mask I sense I have plenty more events like VS2, CAs, Periodic breathing that I do not have with the full face. Any thoughts that I may be registering false info?

Background: 1 picture with nasal mask where also the questions arise, 1 representative picture of a full face mask session (higher leak but lower AHI), last night session with full face mask, new mask liner, tighter fitting and a collar instead of chin strap 

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