Oscar/Resmed: How does it calculate Snore, Flow Limitation and Rera

[tyrinryan]

I am guessing Oscar just makes the Resmed data on the sd card visible to us (helpfully in the form of graphs) and that the Resmed sd card data is also available in the form of the same graphs to sleep labs and sleep doctors that use the Resmed products and have access to Resmed proprietary software . Do you think that this is correct? So the Sleep Lab or sleep doctor could download the data from the sd card and look at the same stuff/graphs through the Resmed program? If you mention Oscar to them, they seem indifferent.

How does Resmed calculate the snore (graph). (it doesn't hear ) Is there a little wiggle in the flow rate graph that we can see for ourselves to check if we ramp up the enlargement, to see if the snore is properly recorded? For example, I have seen "snore" recorded when I am completely awake and (of course) don't remember snoring.

What about the FL graph-could it be just an interpretation of the slope of the top of the inspiration part of the flow rate graph--just turned 90 degrees? as opposed to a determination of airway patency. For example I seem to see a lot of Fl's on the chart even when I am awake and my airway should not be compromised.

What about the Rera's? How are they scored? I do notice some members do not regard the Rera's as that important. Perhaps they are not always properly scored?

Were Rera's not reported on all or not reported on some of the Resmed s9 machines that have sd card and data recording? Does anybody know?

[Jas_williams]

The Resmed Resscan software will read the data directly off the SD card if one is inserted in the machine. As far as your other guesses go OSCAR only reports the data provided by RESMED and exactly how it decides what the events are is part of its Copyright we can make educated deductions and guesses and Resmed do have some information on what things mean you can’t change the events as reported. Only tune your settings.

Snores a vibration in the flow waveform
Flow limitation is a lack of roundness in the top of the inspiration
Rera someone else can comment but it’s only the later Autoset 10’s and the Autoset 10 for her that report them they were not a statistic availiable in the S9’s

[Dog Slobber]

The Resmed Resscan software will read the data directly off the SD card if one is inserted in the machine. As far as your other guesses go OSCAR only reports the data provided by RESMED and exactly how it decides what the events are is part of its Copyright we can make educated deductions and guesses and Resmed do have some information on what things mean you can’t change the events as reported. Only tune your settings.

Snores a vibration in the flow waveform
Flow limitation is a lack of roundness in the top of the inspiration
Rera someone else can comment but it’s only the later Autoset 10’s and the Autoset 10 for her that report them they were not a statistic availiable in the S9’s

Agreed that OSCAR only reports the data.

However copyright simply does to apply. Now ResMed very likely has some of its techniques and algorithms patented, but copyright just does't apply here.

[palerider]

sim card

It's not a "sim" card. it's an SD card, totally different.

sim card

SD card

sleep labs and sleep doctors that use the Resmed products and have access to Resmed proprietary software .

You can use the same software, it's called Resscan.
Get it on apneaboard.com.

How does Resmed calculate the snore (graph). (it doesn't hear ) Is there a little wiggle in the flow rate graph that we can see for ourselves to check if we ramp up the enlargement, to see if the snore is properly recorded?

Yes.

What about the FL graph-could it be just an interpretation of the slope of the top of the inspiration part of the flow rate graph--just turned 90 degrees?

https://accessmedicine.mhmedical.com/da ... 9_f016.png

What about the Rera's? How are they scored? I do notice some members do not regard the Rera's as that important. Perhaps they are not always properly scored?

Were Rera's not reported on all or not reported on some of the Resmed s9 machines that have sim card and data recording? Does anybody know?

SD card.

Rera's weren't scored in the S9 series.

Reras are typically scored when there's poor breathing, then recovery breaths, without hypopneas or apneas.

[tyrinryan]

So do you think that my Sleep Dr. will have the same graph out of rescan that I see from Oscar if I give him or her the sd card to download? The Dr. simply isn't interested in looking at any Oscar graphs because he or she is not familiar with it and of course doesn't trust it.

[Pugsy]

http://montfordhouse.com/cpap/resscan_tutorial/

Above tutorial will have some examples of what your doctor could see with ResScan if he had a mind to use it.
Sounds to me like he doesn't want to look.
You can zoom in on the flow rate using ResScan just like you can with OSCAR/SleepyHead but it does take more work.

ResScan shows essentially the same stuff that OSCAR shows but just shows it visually a little different....the basics are the same though.

[tyrinryan]

Pugsy: Thanks for the video reference. Oscar looks quite good.
Quodos to the people who are working on Oscar.
It looks like Rescan does not have a Rera graph line. Could that video be a from the S9 vintage.
When I check the Rera line on my charts, there is usually (although not always) a good reason for the Rera indication. do you have any thoughts on the accuracy of the Resmed algorithm charting the Rera's?

[Pugsy]

It looks like Rescan does not have a Rera graph line. Could that video be a from the S9 vintage.

ResScan will flag RERAs if the model machine flags them but that's an old video based on the S9 models which didn't flag RERAs. Sorry but that's the only easy way of showing you what ResScan shows.

do you have any thoughts on the accuracy of the Resmed algorithm charting the Rera's?

No real thoughts other than I have to trust the manufacturers and rely on what they say they can do. I am sure it was tested extensively and probably compared to sleep studies with humans in attendance who have direct access to sleep status. So they probably have data comparing human scored RERAs to human scored RERAs to back them up with their claims.
There has to be sleep for there to be a RERA. You have to be asleep for there to be an arousal. Since the machine really can't determine sleep status....well, that's a potential limitation of the data.

I personally don't see RERAs hardly ever so I haven't ever really been able to do any of my own detective work to see if a flagged RERA might be a false positive or not.

There's probably some ResMed documentation somewhere on how reliable the RERA flagging by the machine is compared to human scoring but I haven't bothered to look for it. Just haven't had the need or desire to look.

I do know that all brands of machines can and will flag awake breathing irregularities at times as some sort of apnea event.
It wouldn't surprise me to know that RERAs could also potentially be false positive flagging but I have no proof.
If we aren't asleep...it's not a real asleep event and doesn't count.

When I can't tell or don't know for sure if something is asleep related or awake related I always err on the side of caution and treat it like it is real though. If I can't prove something is awake related false positive then I treat it like it was a real asleep flagged whatever.

[ChicagoGranny]

The Dr. simply isn't interested in looking at any Oscar graphs because he or she is not familiar with it and of course doesn't trust it.

Even with ResScan, most doctors will only look at hours used and AHI. Due to patient load, they don't have time to go into the detail. That's why things work better when you take control of your own therapy.