Inspiratory flow shapes

[ApneGuy]

I have a few question.

1) Does CPAP suppose to change your inspiratory flow shape from abnormal to closer to normal? (I included 2 screen shot 1st one is awake, the shape of the flow graph look normal with rounded shape, 2nd screen shot is when I am asleep/having OA it has the ramp up then drop off closer to a class 6 from this table https://www.apneaboard.com/wiki/index.ph...lasses.png)   Please ignore the cheney stoke (I was awake just gone to bathroom then just put the mask back on - I think it was a fault report, it looks super weird and the machine gave 0 pressure)

2) Does AHI below 5 already matter that much? if I came from AHI of 22.  I don't really believe in chasing 0.  I have noticed most of my OA event happens when pressure is less than 8, so I have made the change as of today to my pressure of 8-20 instead of the default 4-20.

[kappa]

The dotted red "zero" line is the machine's estimate as to where you switch exhale to inhale. So the initial ramp (below zero) is just you completing exhale, then the flat region is pause between breaths. Breaths look fairly rounded and not really like class 6 that I can see. Shaping of breaths comes from CPAP reducing obstruction by inflating the airway and also EPR / pressure support will tend to shape breaths by ramping up the pressure during the initial phase of inspiration.
Increasing min pressure to some effective theraputic level is sensible - no need to have the machine work it out every time it starts. I agree that chasing 0 is not always feasible, but it mostly comes down to how you feel.

[ApneGuy]

Thank you very much, I was getting a bit paranoid