Major discrepancy between ResMed and Sleepyhead AHI

[Uff Da]

Thanks, Pugsy and djams. I viewed one of the videos last night and did pick up a few pointers. Unfortunately, I have a hearing problem not solved by just turning up the volume. And to my ear he talks too fast and doesn't enunciate clearly enough, so I miss a lot of what I expect are important points.

Does anyone have links to some of this information that is in printed form, rather than being so dependent upon audio?

[Uff Da]

As Pugsy suggested after I discussed my previous problem here, I did unplug the machine then re-plug it back in. My results from the display and from Sleepyhead coincided for several days. Then about a week later, August 11, I got an AHI of 4.04 on Sleepyhead and a 17.2 on the machine display. It looks like Sleepyhead (or the SD) just stopped recording any apnea events after about 10:40 PM or so, but continued recording things like flow rate, leaks and the like. From past experience, I know that having no events the rest of the night cannot be accurate.

So again that night I unplugged the machine and plugged it back in. My August 12 report shows AHI of 9.36 on Sleepyhead and 14.4 on ResMed. The Sleepyhead chart shows that it appeared to record events just fine until about 1:45, then just quit recording apnea events again. It so happened that I looked at my Sleepyhead report when I was up for breakfast, so I again unplugged the machine and plugged it back in. It began recording events again for my morning nap.

So what is likely going on here? I shouldn't have to unplug the machine twice in one night!

BTW, I did download ResScan. However, learning new computer programs is such an ordeal for me that I haven't even looked at the instructions yet. I have so much going on right now that I don't know if I'm up to the mental challenge at this point.

[djams]

So what is likely going on here?

Great question I'm eagerly awaiting response to this too. As you point out - extremely unlikely given your history.

BTW, I did download ResScan.

Wouldn't put too much time and effort into it. Even with all it's bugs, I like SH better. Much better. ResScan is intended as a multi-patient management system and there's a lot of extra messing around because of that. Also, it's more focused on big picture stuff.

Someone will be by to help solve this problem soon enough. Unfortunately that person isn't me.

[djams]

After hinking about it for a minute, I do have a suggestion. Try adding a new user, and import the sd card contents in the new user.

Thinking that your SH file might have gotten corrupted.

[Pugsy]

If the new user profile trick doesn't resolve the issue I think I would be contacting whomever supplied you the machine and alerting them to the fact that it seems to not be writing to the SD card properly. You shouldn't have to keep unplugging the machine to make it write to the SD card properly.

You really need to get ResScan up and running to see if anything shows up in ResScan that doesn't show up in SleepyHead.
This would verify that the problem is with the machine and not with the software....or vice versa.
SleepyHead has a few bugs in it but this one is a new one.

Your supplier should also have ResScan available though.

Edit.....BlueDragon said that creating a new profile fixed his issue that appeared to be like yours.
Worth trying.

Remember SleepyHead is Beta software so it is a big buggy (though this is a new bug) and Beta software sometimes just acts up.

[Uff Da]

Okay, I created a new user profile in Sleepyhead, but it didn't fix the issue. The figures for August 1 and 12 were identical to those Sleepyhead had on the AHI. On August 11, the first profile had AHI of 4.04 and the second one had 4.09, compared to the 17.2 on ResMed's machine dial and MyAir.

The CRT from Lincare and I have been playing telephone tag ever since I started this thread but still haven't connected. I could make an appointment to go in and see her through the front staff, but that's usually a two week wait, too. Such is the service we get from a small local medical supply office.

I'll take a look at Res Scan and see if I think my brain can handle it. (I just missed another medical appointment again today and forgot to take my insulin before dinner, so I'm not feeling very confident about my brain just now.) There are days like this.

[Uff Da]

Here we go again. I did download Res Scan, but I'm not sure I know what I'm doing in it yet. Couldn't handle reading all the instructions, so just jumped in.

Last night my Sleepyhead showed an AHI OF 5.55. Res Scan and my machine show 10.3. But for the first time Sleepyhead shows me a detail page that is totally blank. No graphs shown. No events listed other than session start and end times.

ResScan shows the summary graphs page, but on the detailed graphs page just says, "No detailed data available." That's not just for last night, but for the entire time since I started the SD disk in June. What information should I be getting on this detailed graphs page?

Looking back over the previous dates that I had discrepancies, ResScan agrees with the figure shown on the display on my machine, not with the Sleepyhead totals for AHI.

So what's going on? If it is a Sleepyhead problem, why just me?

[hobbs]

Looking back over the previous dates that I had discrepancies, ResScan agrees with the figure shown on the display on my machine, not with the Sleepyhead totals for AHI.
So what's going on? If it is a Sleepyhead problem, why just me?

Resmed makes the machine and Resmed makes the software the machine runs on. Resmed makes ResScan. Which software do you think is more accurate? I do like the sheep and pretty colors on Sleepyhead though.

[Uff Da]

Resmed makes the machine and Resmed makes the software the machine runs on. Resmed makes ResScan. Which software do you think is more accurate? I do like the sheep and pretty colors on Sleepyhead though.

But that still doesn't tell me specifically where the problem lies nor what to do about it. Now I'm not really knowledgeable about a lot of this computer stuff, but my impression was that if the ResScan from the SD disk matched the Sleepyhead data, then the problem would likely lie in the machine not writing to the SD disk correctly. So I'd see my DME. But I'm not seeing anything on the detailed graphs of the ResScan, so is that also a potential problem with writing to the disk? Or is it expected behavior? I don't know enough about ResScan to tell.

And if it is strictly a Sleepyhead problem, is it likely that there was something in my download that got corrupted, since I seem to be the only one having this problem? Or is it somewhere else that something went wrong.

At this point Sleepyhead (usually) gives me all those flow charts and detailed information that I so far haven't been able to get from ResScan. And that detailed information is what is important, not just totals that I see on the ResScan statistics and summary graph pages.

[BlueDragon]

But that still doesn't tell me specifically where the problem lies nor what to do about it. Now I'm not really knowledgeable about a lot of this computer stuff, but my impression was that if the ResScan from the SD disk matched the Sleepyhead data, then the problem would likely lie in the machine not writing to the SD disk correctly. So I'd see my DME. But I'm not seeing anything on the detailed graphs of the ResScan, so is that also a potential problem with writing to the disk? Or is it expected behavior? I don't know enough about ResScan to tell.

And if it is strictly a Sleepyhead problem, is it likely that there was something in my download that got corrupted, since I seem to be the only one having this problem? Or is it somewhere else that something went wrong.

At this point Sleepyhead (usually) gives me all those flow charts and detailed information that I so far haven't been able to get from ResScan. And that detailed information is what is important, not just totals that I see on the ResScan statistics and summary graph pages.

You're not the only one with this problem; I have had it too.

The machine writes the data to the SD card and computes AHI for its display from that same data. ResScan reads the data from the SD card and computes AHI again (or maybe displays the number the machine computed -- I don't know which). MyAir uses data sent wirelessly from the machine so is probably displaying the machine's calculated AHI. SH reads the same SD card and computes AHI. If SH is different than all others, it's the one that is probably off. In my case, by comparing SH details with ResScan details, I was able to determine that SH had not imported the event data for one session, thus resulting in a lower AHI calculation.

To see how I compared SH with ResScan, see viewtopic.php?f=1&t=172643&p=1264398#p1264352. It's quite clear that SH doesn't have the events for the last session of the night. I concluded there was nothing I could do about it but wait for a new version of SH which would hopefully fix that bug.

If no data is being imported for a day, is it possible you did not insert the SD card fully (or not at all)?

[Uff Da]

In my case, by comparing SH details with ResScan details, I was able to determine that SH had not imported the event data for one session, thus resulting in a lower AHI calculation.

Except that you imported all the data into Sleepyhead under a new id and got the data recorded correctly. I imported mine into a new id and got exactly the same thing I did under the first id. Same missing data.

Also, I'm curious about all the missing data on ResScan. Shouldn't I have something showing under detailed graphs? I have zilch. Nada. Not only for last night but for the entire time. I've never used ResScan before, so I don't really know what I'm supposed to be able to get and what I don't. But without some more detailed information, I can't imagine how useful ResScan would be. And if the information was available on the disk, why didn't ResScan see it? Sleepyhead sees a lot more - up until last night with those oddball exceptions of misses of partial information on certain dates. May need to wait for someone who has used ResScan more to tell me if there is something amiss here or not.

If no data is being imported for a day, is it possible you did not insert the SD card fully (or not at all)?

But it is not that there is nothing shown for a day. For last night it showed the information at the left on the "daily" page just fine: the AHI (wrong), hours (correct), OAs, hypopneas, UAs, session times, etc. But the right side of that page, where one normally sees the graphs is totally blank. On the events tab, only session times are shown. No events listed there, even though they were listed on the daily totals on the daily page.

I've unplugged the machine again and will plug it in again tonight and see if I get any better results, but this is very frustrating.

[palerider]

You're welcome to zip up your *entire* sd card and upload it to https://www.dropbox.com/request/0LalWvEsijRIgX8sdM7H
and I'll take a look at it, see if it matches what you have.

[BlueDragon]

One of the things I tried was to purge all the data for a SH profile, then reimport. That didn't work either. In reading notes about SH development, it's apparent that there are problems with the database. V2 is supposed to correct that.

ResScan can be difficult to figure out. I've had problems seeing the data I want. The data was there, but figuring out how to use ResScan was more difficult.

I recommend you take PR up on his suggestion. Another set of eyes looking at the data would be very helpful.

[Jay Aitchsee]

I haven't read all the posts in this thread, but I'll add this as a bit of further info. Forgive if it's already been stated.

The machine writes summary data to the SD card, but also saves it to machine memory. Detailed data is only written to the card and is not saved to machine memory. If the summary data is missing from the card, the machine will rewrite it when the card is inserted. If the detail data on the card is lost or was never written, it cannot be recovered. If the detail data is corrupt, it can not be uncorrupted.

The machine and ResScan use summary data to compute AHI. However, SleepyHead uses the detailed data to construct the time line to compute AHI. If the detailed data is missing or corrupt, then the SleepyHead computed AHI will be in error. So, if only summary data is available, SleepyHead can not calculate a valid AHI and the AHI computed will differ significantly from that calculated by the machine or ResScan. If the detailed data is present, the machine (or ResScan) computed AHI may vary slightly from that of SleepyHead due to rounding and/or the method of computation chosen in SleepyHead preferences. However, this difference is usually only in the hundredths place and is usually not significant.

[Uff Da]

You're welcome to zip up your *entire* sd card and upload it to https://www.dropbox.com/request/0LalWvEsijRIgX8sdM7H
and I'll take a look at it, see if it matches what you have.

What a generous offer! Thanks so much, PR. I don't know how to do the zip file thing, but I'll have my BF show me later. Later today, if he has the time.