Curious question about PS

[zzzZorro]

Been sitting on my hands waiting on a whisper II shipment to check out EERs but in the meantime I tinker with my settings.

Can anyone reasonably estimate the changes that should occur in OSCAR charts if the PS is raised from 2 to 3 and leaving pressure settings as-is?  Currently using ResMed AirCurve10 VATO set 24/16 PS-2.  Getting "sub-one" AHIs (without a collar) with those settings and can deal with the pressures but don't think actual rest is all that good..
Thanks

   

[zzzZorro]

ANSWERED Plugged in 24/16 PS-3 last night to see for myself.  NO cervical Collar. Noticed immediately the air flow that had previously felt warm, (seemingly) short on oxygen and restricted became much better.  Air flow was now without those annoyances.  Felt cooler, fresher and unrestricted. At least that is how it felt to me.  The chart is posted below should anyone also be curious.

   

Note: The last two hours or so was deleted as I WAS AWAKE and that characteristically causes a B-load of SWJ for me.

[Jay51]

In the 2nd chart, your flow limitations are 0.35 95th percentile.  That is a very, very high number.  Even though your AHI is very low.  

You have PS set at 3.  Maybe try 4 and see if that helps decrease flow limitations more.  If VAuto can give PS more then 4, then try that as well. 

Your pressure is pretty high (not a problem if you can handle it).  Possibly by raising PS more, your max pressure may come down a little bit.

That one bad stretch in your 2nd chart could have a positional apnea element to it.  Here is some reading on it and tips:

• 5.3Positional Apnea
  

[zzzZorro]

Thanks for the reply Jay.  I have never learned how to properly interpret Flow Limitations on an Oscar chart. Obviously zero is good but when FL Med is 0.00 and 95% is 0.17 or whatever what should I be looking at? What would be an acceptable FL to shoot for?

Thanks for the positional link but I am a physically committed back sleeper and have no choice.  I will read it over though and FYI I use a Velpeau Neck Brace occasionally when checking out new settings.  The higher pressures do NOT require the brace to get the sub-one AHIs.

Sleeprider was working with me to try to get the pressures down and the FL improved with 20/10 PS-4 a while back but suggested I try EERs.  Waiting on a Whisper II Swivel <supposedly being shipped by one of our suppliers ?>... Till then I am experimenting.

I will dial in the 24/16 PS-4 tonight and see what happens.  I do have a 25/15 PS-4 from a couple weeks ago I will post here FYI.  I expect they are going to look about the same.  The FL is improved here.

   

[Jay51]

Thank you for that.  It looks like you have already tried the PS 4 experiment.  

Does wearing the collar make a big difference in your flow limitations?  

Probably at least single digit flow limitations might be acceptable (less than at least 0.09).   Probably around 0.05 or even lower would be considered good.  But a person can usually tell by the quality of their sleep if flow limitations are too high and causing some problems.  I copied and pasted the chart from our wiki:

Flow Limitation Statistics Interpretation
In general, Any flow limitation showing up in the median statistic is a significant problem.
95% Flow Limitation
Interpretation
> 0.2
Needs more pressure or pressure support
< 0.15
Marginal
0.1
Good
< 0.05
Excellent and rarely associated with other therapy problems
The maximum statistics are not as significant.

Hopefully the EERs experiment works for you.