Your auto-PAP does not prevent events from happening. It adjust based on it's sensors to try to head off events.
Your flow pattern near 1:59 AM was not flagged as an apnea event. This is possibly due to the flow pattern showing activity until 1:58:47. Then a small breath at 1:58:54. Then a return to breathing at 1:59:03. It's sort of a short hypopnea with 7 seconds, then 9 seconds of near zero flow. It takes 10 seconds to score. I postulate the machine didn't score an event based on that pattern.
If that flow pattern correlates with a sinus pause it may be some sort of central event.
A strictly amateur guess might be a disruption of signals in the brain stem -- but, truly, I don't know.
How long was your cardiac sinus pause? What cardiologists sometimes see during a sinus pause is a ventricular escape beat.
It's the heart's way of saying, "Hey, you haven't commanded me to beat, so, I'm going to fire the ventricles anyway."
I would shift focus from the CPAP aspects; and let the cardiologist figure the situation out.
The cardio doc may ask for a neurological consult.
Try not to dwell too much on data. Many people become "hooked" on data.
The depth of knowledge required in your case is beyond the scope of this forum.
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Agree. Many people have issues with Holter (my wife included) in that many time they do not "catch" events. yours did, so this is a good thing. You are using the right equipment to provide your Doctors valid information about what is going on AND it is recording events. If the event was a central, which it looks like given the Holter results, your APAP machine is not designed to deal with it and you may get changed to an ASV type of CPAP which IS designed to attempt to trigger a breath.
That said if your heart was not beating at the time, that is the primary issue. My FIL first got a pace maker to deal with his heart (his pulse rate would go below 30 at times) and then got CPAP do deal with his breathing. He is back golfing and sleeping better than I am now, he just pats his chest and smiles. He used to sleep a lot during the day and now is much more active and happy.