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Tidal volume and Flowrate out of sync? [Airsense 11]
#11
RE: Tidal volume and Flowrate out of sync? [Airsense 11]
(11-24-2021, 12:44 AM)dataq1 Wrote: But when I plot the OSCAR data for those 9 minutes I get many more inflection points (suggesting "new" data), but Resmed has only provided 4 data points.

Why, to my eye, does OCSAR have so much more data for that short session than Resmed has recorded on the SD card?

4 rows for 9 minutes? There should be 270 rows. 

For 9 seconds it would be 4 rows in my experience. For 10 seconds it would be 5 rows. 

My counts should be taken as applicable "mid-stream" or in-stream" , not at start or end of file where counts may be odd.

I write from experience with Autoset and Aircurve 10 series, not the 11 series and have never used data in the PLD file except that for FL as recorded at 0.5 hz..
I have no particular qualifications or expertise with respect to the apnea/cpap/sleep related content of my posts beyond my own user experiences and what I've learned from others on this site. Each of us bears the burden of evaluating the validity and applicability of what we read here before acting on it.  (Disclaimer use permitted by sheepless)

 
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#12
RE: Tidal volume and Flowrate out of sync? [Airsense 11]
fwiw, mask pressure also comes from the BRP file and is high resolution. Yes, I know the label in the EDF file is "Press.40ms" but that is mask pressure and not set pressure.

The graph you posted isn't zoomed in enough to show the interval is less than 2 seconds.
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#13
RE: Tidal volume and Flowrate out of sync? [Airsense 11]
Here are the PLD file structure and a data sample for a file written by a Resmed Autoset 11/27-28/2015 which may help.

   
I have no particular qualifications or expertise with respect to the apnea/cpap/sleep related content of my posts beyond my own user experiences and what I've learned from others on this site. Each of us bears the burden of evaluating the validity and applicability of what we read here before acting on it.  (Disclaimer use permitted by sheepless)

 
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