I was diagnosed with severe sleep apnoea two months ago where my initial sleep study said my AHI was 29 and I think 45 when I was sleeping on my back. I started treatment with CPAP on a Resmed Airsense 10 for her and on the first few weeks my AHI went to less than 2 but the leakage on my mask was around 35 l/min. After a bit of trial and error (now using a full face Phillips) the leakage went down to about 11 l/min which I understand is acceptable. Things started to go wrong about 3 weeks ago when the sleep physician (after my second sleep study) showed me how to reduce the pressure and said to try 11 instead of 14. I actually don’t understand what the value of a lower pressure is apart from maybe swallowing much more air. My AHI started to creep up from between 6 to 9 so I rang the sleep technician 3 days ago who suggested switching to automatic which I did. I think the range was between 4-20 and when it started felt I couldn’t breathe. On the second night about an hour after I put the mask on I had the worst attack of atrial fibrillation that I have ever had and considered calling an ambulance. I landed up taking the mask off and seemed to breathe a bit better even though the AF was pretty bad - it reverted after 12 hours which is normal for me. I think my OSA has caused the AF and very high blood pressure (now under control with medication) which I have had over 10 years. Last night I switched back to CPAP and set the pressure to the top of 14 but still felt I was not getting enough air and after 5 hours of fairly broken sleep, my AHI was 14.2 As I write this with the mask on, I have reset the pressure to 16 and definitely feel like I am getting enough air now. I will take my machine and check in with the sleep technician on Monday.
What I would like to know, is it normal for the pressure to start off at 13 - 14 and give perfect AHI readings only to change a few weeks later and not be enough. How much is too much pressure?
I realise that I will be on CPAP for the rest of my life but I hope and pray it is not going to be this difficult. Thank you in advance!