I'm going to split the baby in half (like Solomon.) I think a talk with the doc is first order of business.
It's possible that some periodic breathing is going on.
The flow diminishes in amplitude followed by a recovery breath.
With no correlating flow limitation, it would seem something involving the central respiratory drive.
Likely not a serious problem -- but disruptive to sleep architecture.
Good that the OP indicates a recent sleep study with no RERAs or CA.
I'm guessing the doc will agree to switch to fixed pressure.
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
Wow - thanks to everyone for your advice, personal experiences, and research etc. This is all very helpful as I was so very tired but now feel really well rested (3rd day). I will definitely circle back with questions as I monitor my progress/numbers and will definitely circle back with the doc at some point about the pressure changes and breathing patterns. Thanks again for all of the great support!
The graphs look normal to me. I have those same hiccups sprinkled among miles of smooth breathing. We are animals not machines. Even my dogs frequently have little breathing derflugalties.
I agree with Ghost about your sensitivity to the APAP. Set the auto minimum at your good constant pressure and let it go 3cm above. That's how I run mine. If you still don't feel as good as the CPAP then reset it to CPAP.
if you can't decide then you don't have enough data.