SpO2 data graphic on Encore chart

Spottymaldoon · Post by **Spottymaldoon** » Tue Aug 05, 2008 6:59 am

I managed to put up a night's SpO2 data to fit with my Encore report. There is not a lot of correlation between events on the SpO2 and apnea/hypopnea events - but I think it's still interesting and I would appreciate some comments from the experts here:

http://richardleveson.com/images/CPAPSPO2graphic.jpg

GumbyCT · Post by **GumbyCT** » Tue Aug 05, 2008 7:22 am

May I ask how you were able to match the two charts up?

Spottymaldoon · Post by **Spottymaldoon** » Tue Aug 05, 2008 9:27 am

GumbyCT
PostPosted: Tue Aug 05, 2008 8:22 am Post subject:
May I ask how you were able to match the two charts up?

I downloaded the data to Excel, then I graphed it there - you can compress or stretch the excel graph on the page. Then I cut and pasted the Encore JPEG to excel and scaled the graph to match. Then I did a screen copy to Photoshop and tidied it up.

I am sure there are easier ways and probably copying the graph to Photoshop might have been faster.

Spotty

DreamStalker · Post by **DreamStalker** » Tue Aug 05, 2008 9:33 am

I assume you were able to start both machine and oximeter at the same times? Do you use the ramp feature on your machine? ... that may explain why it does not correlate exactly even if you did indeed synchronize the machine and oximeter start and end times (I believe machine does not begin recording efficacy data until after ramp duration ends).

Guest · Post by **Guest** » Tue Aug 05, 2008 9:59 am

your ahi is a bit high....your vs is still there....you might need to raise the pressure a bit more....until the vs is 0.

mckooi

6PtStar · Post by **6PtStar** » Tue Aug 05, 2008 10:49 am

Here is one I did last month. I saved the Encore report in Adobe PDF format. Used ScreenPrint32(free program) to cut out a copy of what I wanted from the VitaBase report. Then used Photoshop Elements to open the Encore PDF report and copied the screen print to it and resized it to fit. Not much to it. The hours don't exactlly match up because the clock on my "M" is off by that much but I did start both at the same time so the events should line up.

Jerry

Guest · Post by **Guest** » Tue Aug 05, 2008 5:18 pm

PostPosted: Tue Aug 05, 2008 10:33 am Post subject: Reply with quote
I assume you were able to start both machine and oximeter at the same times? Do you use the ramp feature on your machine? ... that may explain why it does not correlate exactly even if you did indeed synchronize the machine and oximeter start and end times (I believe machine does not begin recording efficacy data until after ramp duration ends).

You made a good point but I checked and there is no ramping. On oximeters I am told by people familiar with their technology that occasional very low readings are generated for reasons not clearly understood, but not because the SpO2 is that low - a true apnea should be accompanied by a faster heart rate I'm told.

6PtStar, your data are amazing! I long for such a night...

Now, how can we use the CPAP to see how our night would have been if we had NOT connected it up? For example, can we run the machine at the very lowest pressure (4?) in CPAP mode and get the report from that? Anybody try?

Spotty

Guest · Post by **Guest** » Tue Aug 05, 2008 5:30 pm

mckooi:
your ahi is a bit high....your vs is still there....you might need to raise the pressure a bit more....until the vs is 0.

Thanks for the comment - I had not thought of using the snore as an indicator. I have notched it up for tonight following your suggestion!
Spotty

6PtStar · Post by **6PtStar** » Tue Aug 05, 2008 5:40 pm

Anonymous wrote:
6PtStar, your data are amazing! I long for such a night...

Thanks, I am one of the lucky ones that once the people on this form told me what to do, I respond so well to cpap therapy.

Keep working at it you can make it too.

Jerry

ywp · Post by **ywp** » Tue Aug 05, 2008 8:27 pm

I have a question along these lines

My cpap and oxy. meter seem to show totally unrelated events?
My cpap will show an AHI of around 2 clustered during certain hours. When it shows all is fine the oxy. meter shows an AHI of 4. with higher heart events. Does this mean a true reading of 2+4=6 events per hour. Or is one of the machines pure nonsense.

Any one else seeing a corralation or lack of.

Mask	Humidifier

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