Change from nasal to full face mask, higher AHI, big aerophagia

[jaspm2004]

Hi there,

I am new member, started to use OSCAR recently. Is a very nice tool. English is not my first language, I will try to do my best.

I changed from Dreamwear nasal mask to Dreamwear Full mask on Dec 5th. I was wearing nasal mask since 2018 when I started to use CPAP machine with no issues, but recently my wife told me that I was opening my mouth when sleeping and a strong air flux was escaping making a lot of noise, almost every night.

Trying to deal with that issue, I changed to Dreamwear Full mask recently but I am having a hard time to adjust. After the change:
- AHI went high
- Leaks are more often
- big aerophagia, i need to wake up in the middle of the night and expulse gas for 20 minutes or more before comeback to sleep

I made some changes on machine settings:
- mask setting, to Full
- pressure to 6 - 14, then 6 - 13 (pressure was 5 - 10 before the change to full face mask)

I am posting OSCAR screenshots to give more details.
- dec 02 2024 - using nasal mask
- dec 21 2024 - higher AHI after full mask change
- dec 25 2024 - a "good" nigth after the mask change

I tried to use a collar for one night, but was very difficult. Maybe I got the wrong one.

Well, i hope to find some answers here. Thanks in advance!

[G. Szabo]

I have the same experience switching between the nasal and full-face dreamwear masks. My AHI is consistently higher with the full-face mask. 
There could be two reasons. (I) The full-face mask pushes my jaw backward and increases the chances of the airway narrowing, causing obstructions. (I) I am a slide sleeper. The more I avoid back sleep, the better my AHI. The full-face mask prevents me from turning my head fully sideways despite using a CPSP pillow.

Advice: return to the nasal mask and use mouth taping.

Commenting on the DEC 2 setting: 
I would set the minimum pressure to 7 cm and use EPR=3, full-time
Would you mind uploading 2-3 minute wide flow rate windows at 6:00  a.m. and 6:24? You might have palatal prolapses or mouth-leaks