But my AHI changed back from 2.1 to 10.8 the first night with the facial mask, then 13.1 next night. I changed from Nasal to Facial several times to be sure : always this kind of result, only the nights with the nasal mask get correct AHI. And as I installed ReScan yesterday, I could see that during some parts of the nights with the Facial mask, I had many Obstructive Apneas (more than forty 35 to 45 seconds apneas in one specific hour !) During these moments, the pressure from the S9 was at the maximum value of 13 - as my doctor ordered.
How is that possible ?
I noticed today, during a nap with the Nasal mask, that I woke up 2 or 3 times with a high flow noise in the mask - and my mouth was opened with air going out. Could it be possible that the good results with nasal mask is a kind of artefact, the air during the apneas entering through the nasal mask and going straight out of my mouth, the result being that the apneas could be hidden to the S9 ? Or is it that the 13 high value is not enough to get rid of the apneas, at least with the facial mask ?