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How are snore breaths detected?
#1
How are snore breaths detected?
I'm curious if I can see within the graphs on OSCAR how and when my Resmed Airsense 10 Autoset detects sleep. According to the docs

"Your AirSense 10 will know you’re asleep no more than three minutes after. That’s because the moment you turn on your machine, AutoRamp is looking for three things:

30 breaths of stable breathing (roughly 3 minutes)
5 consecutive snore breaths
3 obstructive apneas or hypopneas within 2 minutes

Once any of those signs occurs, AutoRamp steadily ramps up your air pressure at a slow, comfortable rate until you reach your prescribed level."

I know how to see obstructive apneas and hypopneas.

Can I see stable breathing and or snore breaths in the OCSAR graphs? If so what do they look like? Even if there is no algorithm in OSCAR to search for and to flag stable breaths I can look just prior to the AutoRamp starting if I know what to look for. Is it stable frequency/ amplitude/ stable shape of the flow graph etc.? What about snore breaths? What do they look like?

I searched but if this has been addressed in other threads please point me to them and disregard this post.

Thanks
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#2
RE: How are snore breaths detected?
When we sleep, the autonomic respiratory nervous system takes control of what is a partially voluntary effort when awake. This has a very characteristic appearance of evenly spaced breath rate with consistent flow rate from breath to breath.  There are many exceptions to this characteristic sleep breathing that result in fluctuating respiration rate and volume, and the auto ramp feature might fail where variable breathing or periodic breathing or flow limitation disrupt the expected pattern. We discuss these patterns briefly in the Optimizing Therapy wiki where we also have illustrations of flow rate wave forms that show flow limitation and snoring http://www.apneaboard.com/wiki/index.php...ng_therapy  You can also see the Variable Breathing wiki which mainly applies to Philips users. http://www.apneaboard.com/wiki/index.php...athing.png  Here is the flow rate illustration. This is somewhat exaggerated, but we can see snores in Oscar as jagged inspiratory peaks in the flow rate chart often in combination with flow limits.

[Image: Flow_limitation_images_zpsdb148d1f.jpg]
Sleeprider
Apnea Board Moderator
www.ApneaBoard.com

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