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Thanks for these comments, in answer to my post... Since posting, I have been taking some advice from a forum advisor on another site, with mixed results, as we twerked the settings, trying for some improvement. My settings when the bad results led to my query were: 6 - 20 Auto ; EPR On, Ramp Only, ...

I would like some advice on whether to continue on APAP in the early hours of the morning, as it seems to trigger/interact adversely with my afib. I can get my AHI <5 for 4-5hrs, but they go upwards of >30 if I continue using mask/machine. My question/dilemma is simply whether I take the apnea risk ...