(08-05-2013, 12:55 AM)1210donna Wrote: apparently things like a yawn in one's sleep can register as a central or simply not breathing whilst rolling over.
Assuming you have a nasal mask (or pillows), a yawn will register as an obstructive apnea event. Typically, you will have closed off the air passage going from your mouth to your nose in order to properly yawn. Hence, an obstructed airway event.
Purposely not breathing while rolling over will probably register as a clear airway apnea event. It _is_ an apnea event, indistinguishable from a central apnea event. You are simply not attempting to breathe. However, rather than your brain having forgotten to breathe, as is the case in a true central apnea event, you are intentionally overriding the automatic breathing reflex and purposely stopping breathing as you roll over. But the machine cannot tell the difference, because it doesn't know that you are awake and intentionally controlling your breathing.
Neither one counts when evaluating your "true" AHI value. Those only count involuntary events when you are asleep.