OSCAR Error reporting Inspiration Time as Expiration?

[SleepyCPAP]

This is weird.  Using OSCAR 1.2.0 on Mac OS laptop.

My Inspiration Time is usually reported somewhere near twice the Expiration Time recorded each night.  This is consistently reported night after night on my recalled PRS1 machines over the years, and now on my recently obtained used ResMed Airsense 10 Autoset.  

For a few days I had a ResMed Aircurve 10 VAuto loaned to me.  When I look more closely that data is flipped.  It looks as if Inspiration and Expiration are backwards, mislabeled. 

If it helps, the VAuto was SW SX567-0302, dating back to 2015 according to it’s serial number. 
The VAuto screen “sleep report” showed “I:E 1:1.9” on the screen on the next night, same ratio as shown in photo. No such ratio is reported on the other machines.

I did not have a change of breathing patterns for those nights!  It has to be an OSCAR glitch.  Which report is wrong in OSCAR?  I’m thinking the VAuto, because shouldn’t it show long inspiration time?  Isn’t that what 1:1.9 implies?

Here are three summer nights in CPAP mode on three machines, with the VAuto shown in the middle, marked with an X.

[attachment=35162]

[pholynyk]

This is an issue that has been brought up earlier, and not resolved to my satisfaction.

One point I am sure of is that when the report the I:E ration as 1:1.9, they really do mean that expiration time is nearly twice as long as Inspiration time.

I have several sample VAuto data sets, so I will be investigating this once the v1.3 release is complete.

[SleepyCPAP]

Pholynyk said:
“ One point I am sure of is that when the report the I:E ration as 1:1.9, they really do mean that expiration time is nearly twice as long as Inspiration time.”

So this is why the use of EPR can help bring the two closer together. On the AutoSet and my old PRS1, it never made sense to suggest EPR, because it would only make expiration go faster, and that is showing in OSCAR to be half the time of inspiration already.

So, the middle OSCAR report for VAuto is right, and the other two are wrong.

Thanks!!! That is something I’ll need to point out to the doctor when I finally get my Sleep & Lung clinic appointment (other thread), and show them OSCAR examples.

I’m glad I had those few days on a device that reports the real ratio.

- SleepyCPAP