When I started on CPAP 4 weeks ago, sleepyhead showed me having a lot of centrals. I asked my doctor about it she said I should turn off the EPR since that can actually induce central apneas. It seemed to work - after turning it off my AHI went down and my incidence of central apneas dropped appreciably. Sleepyhead does reveal many periods of periodic breathing but with the EPR off it does not devolve into a central apnea.
So once I got the centrals worked out my AHI leveled off around 3.4. I feel this number is misleading, however, since I sleep perfectly soundly with no events and no snoring until about 3am when my hourly AHI spikes up to 10 or higher. Almost all of the events are obstructive apneas with very few hypopneas and little snoring. My APAP cranks the pressure up to the maximum setting prescribed by my doctor: 9 (the low is 5).
In an attempt to reduce my AHI even further I've been gradually increasing my pressure from 9 to 9.6 then 10 and strangely enough my AHI has actually increased to a 3 day average of 5.8 which I don't understand at all. Still no hypopneas, no snoring, but lots of obstructive apneas.
I don't understand this at all. Is this just a coincidence or could increasing the pressure actually increase my AHI? I guess I'll try lowering the pressure and see what happens. I'd appreciate any thoughts as to what might be going on.