I have been using the Resmed S9 for 6 years on autoset mode, pressure 6-10, no ramp and APE at 3 (pressure reduction on exhale). I use a nasal mask (Respironics Wisp). Everything perfect, I love it. Then last week I bought an AirMini with the Resmed N20 nasal mask and got it set up with the same settings. When I tried to use it for the first night, I could not fall asleep for 2h (normally it does not take me 10 minutes) and had to go back to the S9 to be able to sleep. I would feel the air flow too strong, specially by the end of my exhale (as if I could not get all the air out of my chest before it started blowing strongly again) or when I was about to fall asleep (I would suddenly wake up with the machine making those strong periodic gulfs of air). Inhale was also uncomfortable, I felt like there was too much air coming in and had some headache.
I tried to make changes on most of the settings to check if it would improve, but none of them made the Airmini to feel nearly as comfortable as the S9. The difference was brutal (not the speak about the noise, which I'm disregarding for now). Things I tried:
- Reduce minimum pressure to 4: it helped but still not close to the comfort of the S9.
- Increase minimum pressure to 7: I read some threads where people mentioned that a too low of a minimum pressure might not be enough to get all the CO2 out. Even though my problem seems to be different, I tried this with no success (actually got more uncomfortable).
- Turning of the pressure reduction on exhale: other threads mention that having this active might make you inhale more than exhale. Again, not sure it would help my case (since I have been using this feature with the S9), but I tried and it didn't bring significant improvement.
- Changing the treatment at the Airmini from Standard to Soft: very little noticeable change.
- Including a ramp: no help neither; little more comfortable with the low pressures at the start of the ramp but gets worse as it moves to the minimum setpoint.
I found lots of threads about the noise problem of the Airmini but very few on people complaining about adapting to the new equipment (just 2 actually, one with no responses and the other one suggesting to explore turning off the pressure reduction on exhale). Because of that, I am not sure if the equipment I got is defective or if it just manages the airflow in such a different way that is not good for me (in which case I would return the Airmini and replace by the Airsense 10 Autoset probably). The difference is gigantic, I can't even fall asleep with the Airmini and with the S9 I sleep very well (and both on exactly the same settings).
Any help would be appreciated!
Thanks!