How to determine length of apneas on sleepyhead

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Pugsy
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Re: How to determine length of apneas on sleepyhead

Post by Pugsy » Wed Aug 08, 2012 9:37 am

Beckah54 wrote:I have a DeVilbiss IntelliPap also and I do like so many things about it. The lack of flow graphs is NOT one of them. Doesn't the DeVilbiss record the information necessary to generate these reports?
Not to my knowledge. It isn't even available on the Devilbiss software reports. It might be there deep within the files somewhere but they don't even show flow on their own software so I would assume it isn't gathered in a manner (if it is gathered) that is easily presented.

I will send a message to the Devilbiss Marketing rep who stops by here from time to time and ask her.

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Re: How to determine length of apneas on sleepyhead

Post by lazer » Wed Aug 08, 2012 10:47 am

Pugsy wrote:ResMed machines actually do score event duration. The numbers in the parentheses for ResMed users are indeed event duration and if you looked at same reports with ResScan that is what you would find.

Respironics machines and the others don't record actual event duration. Instead there are some sort of "markers" (that is what Mark called them) and these are what are used in SleepyHead. I have no idea what "markers" are. I have looked at a lot of my own PR S1 events zoomed in real close and tried to count the seconds. Zoomed in that close makes it awfully hard to see the actual beginning and ending of the event so it is hard to get an "exact" second count. Note that sometimes with PR S1 machines the numbers in the parentheses are often under 10 and events aren't flagged unless they are 10 seconds long...so for PR S1 machines those aren't 8 second events...they are likely very close to 10 second events but the markers put it at 8.
The number in parentheses are real close to event duration though. Close enough that when I saw a 45 next to a hyponea that when I went to look at it zoomed in and manually counted the seconds...it was definitely a really long event and was at least 45 seconds duration. So while the numbers in parentheses aren't really technically event duration because the machine doesn't record it... they are very, very close and likely close enough for what we need. If it says (10) it will likely be fairly short and real close to 10 seconds. If it says (40) it is going to be obvious that it is a much longer event.

They are close enough that I am good with accepting them loosely as event duration. A couple of seconds here or there isn't a big deal. Remember SH doesn't evaluate the flow and flag the event...it is only reporting what the machine sensed and flagged.
Pugsy, I'm confused

I get this from my Repironics: (example from last night)

Image

Always thought those were the actual seconds of the event duration?

What are they?

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Re: How to determine length of apneas on sleepyhead

Post by Pugsy » Wed Aug 08, 2012 11:46 am

lazer wrote:Always thought those were the actual seconds of the event duration?

What are they?
You have a Respironics machine and thus those numbers are likely close enough to give you a real close ball park figure for event duration.
Respironics machines simply to not actually give a precise score for event duration. It is not even available on any of the Encore reports.
If you zoomed in on each one of those to the level that you could actually count the seconds it would be close. It isn't exact though. SleepyHead can't report something that the machine doesn't gather. Resmed machine gather event duration.


The Devilbiss reports are showing (3) in the parentheses...that can't be 3 seconds...the events have to be 10 seconds or longer to get a flag.

Look at this event that I have clicked on the time of 08:24 and it has a (7) in parentheses and the 7 is clearly shown as a marker. This report is from my PR S1 APAP.
It is hard to get the exact starting and ending point for the event but it is obvious it lasted longer than 7 seconds. It had to have lasted at least 10 seconds to get the event flag. There are no 7 second apneas or hyponeas. Can't be. SleepyHead is only reporting what is on the SD card...SH isn't doing the calculations and creating the flags....the machine does that.

Image

I zoomed in much closer here
Image


And here is a hyponea with a 39 marker. It is really hard to tell where it begins but the red square pressure pulse is likely and indicator and the ending is really hard to see because there isn't a marked reduction in flow to measure but eyeballing it and trying to count I get around 45 seconds...hard to tell for sure...obviously way longer than 10 seconds though.

Image

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Last edited by Pugsy on Wed Aug 08, 2012 3:38 pm, edited 1 time in total.
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Re: How to determine length of apneas on sleepyhead

Post by DeVilbiss Marketing » Wed Aug 08, 2012 11:50 am

To clarify, the IntelliPAP does not record the breathing pattern or breath-by-breath detail. Please let me know if I can provide any additional information.