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[Treatment] Fine Tuning - What's the cause of these hypopnea events?
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cpdaniel Offline

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Machine: Resmed AirCurve 10 VAuto
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Other Comments: Untreated AHI: 58. Undiagnosed years: 20+

Sex: Male
Location: Central California, USA

Post: #1
Fine Tuning - What's the cause of these hypopnea events?
Here's a snapshot from SH from a typical night (last night, to be exact):

   

This shows a period of about 30 minutes during which my machine up'd the pressure several times in response to minor flow limitations, eventually maxing out at 20 and waking me up. I have several episodes similar to this every night - last night, there were 4 - two that woke me up and two that did not.

I'm trying to assess what might be causing these periods, whether they're anything to be concerned about, and what, if anything, I might want to do about them.

Working theory: these are periods when I roll over onto my back.

If you look at about 2:16 AM, there's a CA and a mini-hypopnea - this pattern looks very much like what's seen at 2:43 AM (just after re-starting). At 2:43 I know I was awake - was I awake (albeit briefly) at 2:16 as well?

Between 2:16 and 2:27, it looks like I'm sleeping peacefully, then a series of pressure bumps starts, with each bump followed by a period of adjustment in my breathing, culminating in a series of OA/H that drive the pressure up to max until I awake at 2:41.

So, what do you think? I'm planning on trying out some of the pillow-devices that prevent rolling over onto my back. I'd also like to get a logging oximeter to see what sort of desaturation I'm seeing associated with these periods (if any). Any other ideas for pinning down what's really going on during these periods?

-cd
12-07-2015 07:29 PM
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justMongo Offline

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Machine: ResMed VPAP Auto (S9)
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Post: #2
RE: Fine Tuning - What's the cause of these hypopnea events?
Looking at both flow limitation and flow rate, you are experiencing diminished flow at those times.
And, your pressure is really ramping up as you noted.

I think your working theory is sound; and keeping off your back is worth trying.

I usually side sleep for that reason. I'm able to stay on my side for the night.

There have been several methods talked about on the board for preventing rolling on the back.
One method was sewing tennis balls in the back of a tee-shirt.
Whatever it takes...

Regards,

Mongo

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12-07-2015 08:20 PM
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PoolQ Offline

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Location: Sillicon Valley

Post: #3
RE: Fine Tuning - What's the cause of these hypopnea events?
I agree with justMongo. I doubt that you O2 sat will be doing much as it looks like you have some serious recovery breathing after each event. O2 in your system just does not drop al that fast
12-07-2015 10:52 PM
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cpdaniel Offline

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Posts: 61
Joined: Nov 2015

Machine: Resmed AirCurve 10 VAuto
Mask Type: Full face mask
Mask Make & Model: F&P SimPlus
Humidifier: Built-in
CPAP Pressure: IPAP: 9-17, PS: 4
CPAP Software: ResScan SleepyHead

Other Comments: Untreated AHI: 58. Undiagnosed years: 20+

Sex: Male
Location: Central California, USA

Post: #4
RE: Fine Tuning - What's the cause of these hypopnea events?
(12-07-2015 10:52 PM)PoolQ Wrote:  I agree with justMongo. I doubt that you O2 sat will be doing much as it looks like you have some serious recovery breathing after each event. O2 in your system just does not drop al that fast

That's what I figure too - but I'm a data nerd, so I'll get the Oximeter and find out for sure. I'll be very surprised if there's much (if any) noticeable desat during those short events.

Thanks for the note Smile
12-07-2015 10:54 PM
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