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Understanding tightly clustered CAs
#1
Understanding tightly clustered CAs
Last night, I decided to use my P10 mask instead of my usual F30 but with no change in pressure settings.  AHI jumped up, caused primarily by two tight clusters of CAs (average AHI for me is about 1.7.)

Can someone tell me what was probably happening during these CA clusters?  I see waxing and waning in the flow rate.  SpO2 values have the same pattern. SpO2 was high for me (98%) before this sequence began and dropped to its lowest value of the night (81%) during this sequence.

Any suggestions are most appreciated!

   

   
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#2
RE: Understanding tightly clustered CAs
looks like my periodic limb movement pattern.
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#3
RE: Understanding tightly clustered CAs
Guy you’ve had periodic breathing and CA’s before. A p10 nasal mask has a smaller volume than a F30  maybe this caused sufficient over ventilation to cause the rise in CA’s you will prob find the tail off if you keep using the P10

It does seem to coincide with REM sleep maybe. Mine is like that every night but the cluster lasts upto 30 min hence I use an ASV

Here’s a typical night for me on an Autoset a bit more dramatic than yours Big Grin[Image: attachment.php?aid=10362]
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#4
RE: Understanding tightly clustered CAs
Thanks for the explanation; your chart is pretty dramatic! I had wondered if the high SpO2 graph before the onset of this sequence was related, and over ventilation would probably raise the SpO2 level?

The pressure did feel noticeably higher -- like I was constantly breathing very deeply -- with the P10. When I used a P10 before, I probably used a lower pressure, so I'll try that again if I stick with the P10. (I stopped using the P10 because of excessive mouth breathing. Since the F30 had kept my mouth closed, I wondered if mouth breathing might have stopped. At least it did for this night.)
The current version of OSCAR is 1.2.0.  We recommend upgrading from any earlier version.

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Membership in the Advisory Members group does not imply medical expertise or qualification for advising Sleep Apnea patients concerning their treatment.
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#5
RE: Understanding tightly clustered CAs
Overventilation would tend to raise O2 levels and I'll bet your CO2 levels are dropping at the same time.
Any persistence and I'd cut back on EPR.
Fred Bonjour - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter 
OSCAR

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#6
RE: Understanding tightly clustered CAs
I increased my min pressure from 9.8 to 10.2 on the first of May and have been using those settings all month. My goal was to see if a slight pressure increase would improve treatment measuires. Overall, HI and OAI seem relatively unchanged, while CAI is slightly increased (even without last night's contribution), so this does not seem to have been a useful adjustment.
The current version of OSCAR is 1.2.0.  We recommend upgrading from any earlier version.

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Membership in the Advisory Members group does not imply medical expertise or qualification for advising Sleep Apnea patients concerning their treatment.
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