False events
False events
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?
Re: False events
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Mask: Ultra Mirage™ Full Face CPAP Mask with Headgear |
Humidifier: IntelliPAP Integrated Heated Humidifier |
Last edited by Julie on Tue Apr 18, 2017 9:11 pm, edited 1 time in total.
Re: False events
Can you give an example of the skewing?hardball wrote: these false events skew my AHI rating.
Re: False events
Well, it counts as 'events' things that are really just me trying to yawn. So, I have 3 or 4 'events' that aren't apnea events. These get added into the calculation of AHI, and give me a higher rating than I should have.Guest wrote:Can you give an example of the skewing?hardball wrote: these false events skew my AHI rating.
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Re: False events
If you actually need to yawn, then it is a real event. Do not sweat it.
Just let it be.
It does not really matter.
Just let it be.
It does not really matter.
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Re: False events
You are the only one looking at the score. Ignore the CA's since they are what is called sleep/awake junk. The computer doesn't know if you are awake, sleeping, yawning etc. It just knows there was a lull in the breathing for 10+ seconds.hardball wrote:Well, it counts as 'events' things that are really just me trying to yawn. So, I have 3 or 4 'events' that aren't apnea events. These get added into the calculation of AHI, and give me a higher rating than I should have.Guest wrote:Can you give an example of the skewing?hardball wrote: these false events skew my AHI rating.
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Machine: ResMed AirSense™ 10 AutoSet™ CPAP Machine with HumidAir™ Heated Humidifier |
Mask: Fisher & Paykel Vitera Full Face Mask with Headgear (S, M, or L Cushion) |
Additional Comments: Back up is S9 Autoset...... Buckwheat hull pillow |
Re: False 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.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?
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.
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Machine: DreamStation BiPAP® Auto Machine |
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Additional Comments: PR System DreamStation and Humidifier. Max IPAP = 9, Min EPAP=4, Rise time setting = 3, minPS = 3, maxPS=5 |
Re: False events
It may be different for your machine, I'm not up on the newer ones, but that's the only reason I use the ramp feature for a few minutes so I can get most of the yawning, coughing and throat clearing out of the way before the data counts it in the reports. If that ramp for a few minutes became a problem for any reason, I would just know to ignore the extra "events". But then again, I haven't had a sleep doctor monitoring my data for about 6 years.
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