Thanks for trying the flex and observing the settings. It was not my cuppa tea either. What was the CA vs OS? While Flex was not good for you, it's possible that bilevel could be very good to reduce that RDI and get better ventilation. It's a completely different feel.
The higher events on on Flex mostly OA (3, 1, and 1 on the three nights) which seems insignificant to me. I get one now and then with no flex.
Last night I went back to having flex off. While it feels slightly odd after using flex for several days (most on 1), I had no difficulty exhaling. My Tidal Volume graph now looks more normal as does my Flow Rate graph. But... I woke up frequently and had light sleep as evidence by continually remembering my dreams. My AHI was 1.4 and my RDI just over three. I am going to let this settle out a bit and then see if a higher minimum pressure with flex has a good result. I also have my sleep doctor appointment today so I will see if he is at all interested in this.
Well, you know how it works. Anytime you make a change, there is a period of time that may have higher events. It's best to hold judgement on effectiveness of a change for at least a week.
You're not very far out from your test. As far as options, it's your choice, but I kind of like option 2. It gives a fair chance to flex without the variable of more pressure. In theory the machine should increase pressure as needed. Respironics is a bit slow to get there, but it still responds to flow limits, snores and volume changes.
I had another look at the days when I was using flex. On all of them, the pressure maxed out at 16 and I was still having OA and H. On the night without flex, it maxed out at 14.4. I feel a LOT better today despite the frequent wakings. I am going to leave it as is (no flex) for a night or two then reconsider. I am still wiped out from those flex nights.
The sleep doctor visit was interesting. He had no software to read my SD card and was dismissive of the accuracy of the software on these machines. He did spend a long time talking to me and asking questions, which I was very happy about. He suggested that UARS or PLMD might be behind this. Hopefully the sleep study will shed some light.
A brief update on this. I went back to a Flex of 3. My AHI has come down, though not as far as before. I also finally got fully off of the Effexor. Wow. That sucked, still sucks. I'd read about floating brain, and brain zaps, and strange sounds in your head. Bunch of wild eyed lunatics I thought. But, no. My head feels and sounds like a sound track for Star Wars. I've come off of anti-depressants a few times before but this is in a class of its own! Today is day 5 or 6. Last night I had the longest, deepest sleep that I can recall in recent years. Between an AHI of 2.8 and withdrawal effects, I don't feel great. But man did I sleep! My graphs are still all over the place, no change there. But I slept! Did I mention that?