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lilly747 wrote: Also it can take time for CAs to go away if they are Pressure induced.Your body over time adjusts and you stop (EDIT: should be "OVER ventilating") ventilating. For example I have CAs, if I change my PS from 1 to 1.4, my CAs go crazy. And when I put PS back to 1, my CAs take 2 to 4 weeks to go back down. It's like once I get them stirred up, it takes for ever to get them settled back down.

Like I said CAS can drive you crazy...

This makes me wonder... Before ASV I was on APAP for four months, with average AHI sound 13, but varying wildly. Some nights large numbers of centrals; some nights very few. Pressure range was 8-20.

For reasons I won't get into, it took a while before it was observed that I had these centrals going on, and another long while before a sleep study happened. I'm talking months.

If your experience of centrals being "sticky" is common, it's possible that by the time I had my study it wasn't possible to discern whether mine were "true" centrals or lingering pressure-induced. No effort was made to adjust the DreamStation settings after the study. We went straight to ASV.

ASV has pretty much gotten rid of the centrals, and virtually all OAs, but a few dozen hypos a night remain. But I still wonder if any tweaks to APAP would've worked.


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tmoody wrote:If your experience of centrals being "sticky" is common, it's possible that by the time I had my study it wasn't possible to discern whether mine were "true" centrals or lingering pressure-induced. No effort was made to adjust the DreamStation settings after the study. We went straight to ASV.

ASV has pretty much gotten rid of the centrals, and virtually all OAs, but a few dozen hypos a night remain. But I still wonder if any tweaks to APAP would've worked.

Hi tmoody, I have followed your threads very closely and looked at all your data. I am not the best one to make an evaluation in your case, however, your machine is STILL working hard to stop those CAs. If/when you get 1 or 2 month down the road with no pressure changes, you may have your answer staring at you in your data.