hardball wrote:I've been using a CPAP machine now for 4 weeks - a ResMed Autosense 10, with a ResMed large nasal pillow. My range is set to 10-20. My problem is, it usually takes me about an hour to fall asleep, and while waiting to fall asleep, I will have several deep yawns, which take longer than 10 seconds to complete. When I yawn, I'll have to open my mouth, but still keeping the pressure in my nose. However, the ResMed interprets this as an 'event', and flags it. I usually have to take 3-5 deep yawns before I fall asleep, and these false events skew my AHI rating. Is there a way to keep the machine from flagging these events?
Don't stress out over the 3-5 "events" caused by yawns that happen before you are actually asleep. In the grand scheme of things, they're not affecting the recorded AHI as much as you might think they are. And also keep in mind that the fact that you are using the machine for about an hour before falling asleep also skews the data, although in the opposite direction.
To illustrate what I mean, let's look an example with some made up data.
Let's suppose that you use the mask for 8.5 hours, but during that first hour of usage you are actually awake. So your real sleep time is actually 7.5 hours.
Now let's suppose that during the 7.5 hours of real sleep you have 14 real events scored. So your real AHI would be 14/7.5 = 1.87.
Now lets add 4 "false events" caused by the yawns in that first hour of usage before you fell asleep: The machine assumes your sleep time is 8.5 hours and that the number of events is 18 = 14 real + 4 fake events. So the machine calculated AHI = 18/8.5 = 2.11.
The difference between the true AHI = 1.87 and the machine calculated AHI = 2.11 is not statistically significant, and it's certainly not enough to worry about.