sleepyhead

General Discussion on any topic relating to CPAP and/or Sleep Apnea.
Maryd
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sleepyhead

Post by Maryd » Thu Oct 16, 2014 5:35 pm

In sleepyhead….What does the number, inside the parenthesis, mean after events? Does it mean that is how long the event lasted?

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palerider
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Re: sleepyhead

Post by palerider » Thu Oct 16, 2014 5:59 pm

Maryd wrote:In sleepyhead….What does the number, inside the parenthesis, mean after events? Does it mean that is how long the event lasted?
for resmed machines, yes. (for most things)

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archangle
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Re: sleepyhead

Post by archangle » Thu Oct 16, 2014 6:00 pm

Maryd wrote:In sleepyhead….What does the number, inside the parenthesis, mean after events? Does it mean that is how long the event lasted?
It's supposed to be the number of seconds the event lasts. Sometimes it's a little unclear where the number comes from when you look at the waveform.

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Pugsy
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Re: sleepyhead

Post by Pugsy » Thu Oct 16, 2014 6:05 pm

ResMed machines flag event duration in seconds...so SleepyHead picks up that number. If a person were to use ResScan the event duration shows in a little red box above the flagged event (OA, Hyponea, CA which is central).

PR S1 users...it's close but not exact ...long complicated explanation that I don't have time to go into at the moment...but it's close enough to give some one an idea if the event flagged was prolonged or short duration. People sometimes see 7 or 8 or 9 in parentheses with the PR S1 machines and that isn't quite correct because the event has to last 10 seconds to earn a flag...but from what I have seen..it's within 3 or 4 seconds if a person counts the seconds and close enough....if it shows 7 or 8 or 9...it's going to barely make that 10 second criteria.

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sc0ttt
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Re: sleepyhead

Post by sc0ttt » Thu Oct 16, 2014 10:51 pm

Pugsy wrote:ResMed machines flag event duration in seconds...so SleepyHead picks up that number. If a person were to use ResScan the event duration shows in a little red box above the flagged event (OA, Hyponea, CA which is central).

PR S1 users...it's close but not exact ...long complicated explanation that I don't have time to go into at the moment...but it's close enough to give some one an idea if the event flagged was prolonged or short duration. People sometimes see 7 or 8 or 9 in parentheses with the PR S1 machines and that isn't quite correct because the event has to last 10 seconds to earn a flag...but from what I have seen..it's within 3 or 4 seconds if a person counts the seconds and close enough....if it shows 7 or 8 or 9...it's going to barely make that 10 second criteria.
So with a PR S1, it's probably fair to say a 30 lasted about twice as long as a 15... but a 12 and a 14 might really about the same. Yes?

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palerider
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Re: sleepyhead

Post by palerider » Thu Oct 16, 2014 11:02 pm

sc0ttt wrote:
Pugsy wrote:ResMed machines flag event duration in seconds...so SleepyHead picks up that number. If a person were to use ResScan the event duration shows in a little red box above the flagged event (OA, Hyponea, CA which is central).

PR S1 users...it's close but not exact ...long complicated explanation that I don't have time to go into at the moment...but it's close enough to give some one an idea if the event flagged was prolonged or short duration. People sometimes see 7 or 8 or 9 in parentheses with the PR S1 machines and that isn't quite correct because the event has to last 10 seconds to earn a flag...but from what I have seen..it's within 3 or 4 seconds if a person counts the seconds and close enough....if it shows 7 or 8 or 9...it's going to barely make that 10 second criteria.
So with a PR S1, it's probably fair to say a 30 lasted about twice as long as a 15... but a 12 and a 14 might really about the same. Yes?
based on what jedimark has told me, there's really not much correlation between the numbers that the prs1 reports and actual time... but you can turn on a new resync feature on the cpap tab in preferences in 9.8+ SH and it'll refigure the durations and make them meanigful.

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Pugsy
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Re: sleepyhead

Post by Pugsy » Thu Oct 16, 2014 11:24 pm

sc0ttt wrote:So with a PR S1, it's probably fair to say a 30 lasted about twice as long as a 15... but a 12 and a 14 might really about the same. Yes?
Yes..probably.. When we first got SleepyHead and the numbers in parentheses everyone assumed it was duration like Resmed but I knew it wasn't because the machine doesn't record it like that.
But I would eyeball some those events in terms of event duration in seconds and man, they looked awful close so one day I set down and went through probably a hundred or so various events and zoomed in close enough to count the seconds. There is a problem when we zoom in close enough to count seconds...the beginning and the end of the event gets zoomed in real close too and it's harder to see the beginning and ending at that level of being zoomed in.

So with those limitations I tried to count various events of various "duration". They were all withing 2 to 4 seconds of the number in parentheses...and given there was a margin of error simply because it was hard to see the exact beginning and ending. 2 to 4 seconds being off was what I thought pretty acceptable error margin.
After all it isn't a critical need to know if that even flagged is 22 seconds long or 25 seconds long exactly.
They were never terribly off...never anything more than 2 to 5 being off and that could easily have partly been my inability to gauge the exact onset and ending. The 6 to 9 ones...barely made it to 10 seconds on the dot. I had a hyponeas with 45 in the parentheses and I counted 43 seconds and it's really hard to see when a hyponea begins and ends because the flow reduction isn't always all that markedly obvious.

In general.. it's close enough that I don't have a problem calling it duration. Being off 2 or 3 seconds doesn't really make a huge impact. If you have a 50 second event...it's going to show up as a long event.

I never could find an event that was way off from the number in parentheses by more than 3 with any degree of certainty. Play with it sometimes and you will see what I mean but you have to zoom in pretty tight to get the second hash marks to a point you can see them well enough to count them.

It's close enough for government work as they say and I don't see the need to go into the big long "it really isn't...." speech.
Those numbers are really markers of some sort and I think that they may be related to a data point that Encore reports...while it doesn't set each event with duration...it will give us "time in apnea" and for it to be able to do that it has to have some sort of scoring or counting system and I think the markers are part of that system. Now I might be all wet but I don't see how Encore can report "time in apnea" without some way to count the time.

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archangle
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Re: sleepyhead

Post by archangle » Fri Oct 17, 2014 6:57 am

Click on the individual event in the events tab, and then you can see the airflow graph zoomed in on the appropriate time. It's often hard to figure out the correlation between the number on the event and the actual waveform.

I usually look at the numbers to see if anything looks particularly bad, then click on that one and look at the waveform.

The numbers make more sense when you have a clear "on/off" obstructive apnea. Less clear events with starts and stops, and hypopneas are often somewhat unclear when you look at the waveforms. I decide for myself how bad it is when I look at the waveform.

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DavidT1954
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Re: sleepyhead

Post by DavidT1954 » Sun Nov 23, 2014 7:18 am

Seems that lately my sleepyhead software is not reading correctly. Most all of the H's (hypopnias?) aren't existant when I zoom in on the waveform / flow rate chart. The blips can remain constant, but a H event is recorded. Is this software related, or is my machine giving false data ?

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Pugsy
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Re: sleepyhead

Post by Pugsy » Sun Nov 23, 2014 8:22 am

DavidT1954 wrote:Seems that lately my sleepyhead software is not reading correctly. Most all of the H's (hypopnias?) aren't existant when I zoom in on the waveform / flow rate chart. The blips can remain constant, but a H event is recorded. Is this software related, or is my machine giving false data ?
Hyponeas are hard to evaluate when you zoom in on the wave form because hyponeas can be flagged with a much smaller flow reduction and isn't nearly as pronounced as a OA.
SleepyHead only reports what the machine reports. SleepyHead doesn't do the deciding about what to call a flow reduction. SleepyHead doesn't evaluate the flow data...it just shows what the machine has recorded and what the machine has called something.
You can use Respironics software to confirm the data if you wish.
No Mac version though. Respironics is strictly Windows software.

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