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Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
#1
Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
Hi all,

My first night in "S" mode so that I can get lower EPAP (compared to VAuto range that ends at 4cm).  ResMed AirCurve 10 VAuto set to "S" fixed bilevel pressure, EPAP 3 cm, IPAP 6 cm.  OSCAR 1.3.0 on MacOS.

A flat line of 0.01 FL exists for the entire time the machine is on.  Is this an OSCAR reporting glitch? 

There are times I do see flattening of the curves, when zoomed in.  And plenty of breaths that do not show flattening. 

Here is a closeup.  My treatment thread also has this image, along with a whole night screenshot. 
[attachment=38890]

- SleepyCPAP
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#2
RE: Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
Sorry,
A subsequent search gave this answer:
http://www.apneaboard.com/forums/Thread-...#pid419108

Because the machine isn't going to respond in "S" mode, it therefor does not record FL.
Thanks Gideon for noting this.

It is going to mess with my therapy analysis if I don't have a score, but I should be able to scan the waveforms manually.
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#3
RE: Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
I just checked the clinicians manual and it does say that only the VAuto mode responds to FLow Limitations.  

This would be the same as using a regular AutoSet in Cpap mode, where in Cpap mode, you wouldn't see Flow Limitation.  

SleepyCpap, if you need a Clinicians Manual, order it from here:

https://www.apneaboard.com/adjust-cpap-p...tup-manual
OpalRose
Apnea Board Administrator
www.apneaboard.com

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#4
RE: Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
Although a workaround can't match your exact settings, you could set it to "VAuto" with a setting of Min 4, Max 7, and the PS 3. That is as close as it will get.
Crimson Nape
Apnea Board Moderator
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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#5
RE: Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
(01-13-2022, 08:46 AM)OpalRose Wrote: I just checked the clinicians manual and it does say that only the VAuto mode responds to FLow Limitations.  

This would be the same as using a regular AutoSet in Cpap mode, where in Cpap mode, you wouldn't see Flow Limitation.  

SleepyCpap, if you need a Clinicians Manual, order it from here:

https://www.apneaboard.com/adjust-cpap-p...tup-manual

While it is true that a regular Autoset in CPAP mode does not respond to Flow Limitation it will display them. I prefer to use use this measure, together with Hypopnea index as an indication of my treatment success as it better correlates with "how I feel".
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#6
RE: Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
(01-13-2022, 09:20 AM)Crimson Nape Wrote: Although a workaround can't match your exact settings, you could set it to "VAuto" with a setting of Min 4, Max 7, and the PS 3.  That is as close as it will get.

Try Red's settings for a night.  That should give you a good idea of flow limitations.  The real difference is you have an EPAP of "3" in "S" mode and it will be "4" in "VAuto" mode.
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#7
RE: Flow Limitations not scored properly in "S" mode? OSCAR 1.3.0
Hi all,

Yes, I just finished five days in VAuto mode PS3 4-9cm. My treatment thread reveals that I was doing fine at that setting, and it barely budges from the 4-7 setting. AHI was 0.0 every night, and FL 99.5% was mostly +/- 0.05 for four out of five nights (with one bad night of 0.20). My goal is to keep reducing, to see how much work the AlaxoStent is doing. To get lower EPAP I moved to “S” mode last night.

I agree with Grandpapa-G that Flow Limitations helps a great deal to monitor how things are going. My AHI is 0.0 when using the AlaxoStent with PAP, so it is FL or SpO2 which have caught my eye now.

I do have the clinician’s manual, it is a good resource.

I’m sorry ResMed and Philips Respironics don’t believe FL is worth reporting outside of Auto modes.

- SleepyCPAP
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