My AHI numbers are pretty good, including the odd <1 though this is infrequent. Over the last few months my major events have been CAs and as I had an EPR setting of 2, I wondered if I was getting some CO2 washout. So last week I dropped it to 1 and this didn't affect my sleep comfort. I got to sleep just as quickly and either had one bathroom stop or slept right through the night.
My CAs have gone right down but my Hs have gone right up. I also don't feel as if I got the sleep quality that I normally get. It's not a significant loss but I have noticed it.
So could a lower EPR cause this? Is this normal? Should I increase my lower pressure level (from 10 to 11) to compensate? Has anyone else noticed this effect?
That doesn't make sense if they're obstructive hypopneas, but maybe they're central? What does the flow chart look like - do you have the big recovery breath typical of an obstructive event, or is it a smooth resumption? (I know it's often hard to tell with hypopneas). If your total number of events is small it might just be "static".
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EPAP level takes care of obstructive apneas. Pressure support on top of EPAP takes care of hypopneas. But higher PS also may increase CAs by excess co2 washout.
In resmed machines EPR x = pressure support of x cm h2o.
So reducing EPR may add to hypopneas and reduce CAs
So it's a trade off between the two. And the barometer to decide is: how do you feel in the morning and during the day on different settings.
Started APAP 4-20, Closed range to 7.5-14, then straight 8.0 w/ Aflex 3
RDI always below 1. But sleep much much better at straight pressure.
Started on F10, Tried Quattro Air successfully. Finally settled on P10.