Googling a bit , it seems that it could be from CPAP swallowing air.
I have checked my heart and everything was good..
There is pressure on my left side of chest, especially when I try to sleep on the left side..
I can hear gases in that area..
So do I bring the pressure down (resmed AIR Sense 10)
current pressure is 6 min, 10 max...
However, I also wake up a lot and sometimes gassping for air..... Also the left chest hurts when I gasp for air.