I am brand-new to the site. This post got my attention. I was Rx'd a ResMed CPAP machine in early December after one diagnostic sleep study and then a CPAP test. I have used full-face mask's from the get go. The CPAP kept filling my gut with air so after a month I was told I needed a VPAP machine (which to my dismay was twice as expensive and was told I had bought the CPAP and it was mine. No exchange).
Anyway...I am on the ResMed Auto VPAP and still get a gut full of air. I also have Ulcerative Colitis so it is extremely painful. Apparently after dosing off something occurs that makes me rip the mask off and go back to sleep. I'm a mouth breather and this thing is kicking my tail. Any suggestions are welcome.
In theory, if the airflow shuts down and you have a nasal mask, your reflexes will cause you to open your mouth and breathe through it. That's why all FFMs have anti-asphyxia valves.
If you tape your mouth shut with a nasal mask, you might keep rebreathing the air that you exhale back down the hose as the O2 levels drop and CO2 rises.
While CO2 can be dangerous, in this scenario, it's probably the low O2 levels that are the most dangerous. Either the CO2 or O2 can render you unconscious and stop you from taking the mask off if you don't wake up.
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for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.