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Sleepyhead Data Weirdness
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courtney123 Offline

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Machine: REMstar Auto A-Flex
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Post: #1
Question Sleepyhead Data Weirdness
Last night in a fit of boredom, I was rummaging through the setup menu on my CPAP machine looking at results.
"Last 7 days - AHI: 0."
Huh?
No apneas?
Not according to Sleepyhead which says I average between 1 and 3 a night.

For the Sleephead experts: Does Sleepyhead interpret the data or just take what the machine gives it?

For another example - from last night (N1.jpg) it sees this as an hypopnea.
Not close.

What do you trust? Sleephead or the machine?


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Aloha,
MrCourtney
Honolulu, HI
(This post was last modified: 07-28-2013 04:38 PM by courtney123.)
07-28-2013 04:10 PM
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Paptillian Offline

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Post: #2
RE: Sleepyhead Data Weirdness
SleepyHead generally reports higher numbers than the other software I use (ResScan) but it's not a huge difference. I don't know which is more accurate.

I think I had read that hypopneas are scored as a 40% reduction in flow for 10 seconds followed by a recovery breath. There doesn't need to be a flat line in the flow.
(This post was last modified: 07-28-2013 04:49 PM by Paptillian.)
07-28-2013 04:49 PM
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courtney123 Offline

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Posts: 67
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Machine: REMstar Auto A-Flex
Mask Type: Nasal pillows
Mask Make & Model: F&P Pilairo
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CPAP Pressure: 11
CPAP Software: SleepyHead

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Sex: Male
Location: Honolulu, Hawaii

Post: #3
RE: Sleepyhead Data Weirdness
(07-28-2013 04:49 PM)Paptillian Wrote:  I think I had read that hypopneas are scored as a 40% reduction in flow for 10 seconds followed by a recovery breath. There doesn't need to be a flat line in the flow.

Yeah, read that too. The readout has no difference in the flow for several minutes on either side of that marker.
That's one of the thing's that are making me question the accuracy.

Thanks.

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MrCourtney
Honolulu, HI
07-28-2013 04:52 PM
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PaulaO2 Offline
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Post: #4
RE: Sleepyhead Data Weirdness
It is also possible that the machine is not displaying it properly.

SleepyHead and ResScan are both fairly close for my data. It seems as though they round off the numbers differently.

That is a hypopnea in the image. It is flatter than those around it. Granted, not by much but enough to register. When it comes to hypopneas, I look at length, not that one was counted.

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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
07-28-2013 05:33 PM
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courtney123 Offline

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Posts: 67
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Machine: REMstar Auto A-Flex
Mask Type: Nasal pillows
Mask Make & Model: F&P Pilairo
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CPAP Pressure: 11
CPAP Software: SleepyHead

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Sex: Male
Location: Honolulu, Hawaii

Post: #5
RE: Sleepyhead Data Weirdness
(07-28-2013 05:33 PM)PaulaO2 Wrote:  It is also possible that the machine is not displaying it properly.

SleepyHead and ResScan are both fairly close for my data. It seems as though they round off the numbers differently.

That is a hypopnea in the image. It is flatter than those around it. Granted, not by much but enough to register. When it comes to hypopneas, I look at length, not that one was counted.

Hi Paula -

Thanks for your interpretation. I was maybe weighing too much on the supposedly "40 Percent" drop necessary to qualify.
So, any clearly visible flattening is something to look for?

Thanks.

Aloha,
MrCourtney
Honolulu, HI
07-28-2013 06:07 PM
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Sleepster Offline
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Post: #6
RE: Sleepyhead Data Weirdness
(07-28-2013 04:10 PM)courtney123 Wrote:  Last night in a fit of boredom, I was rummaging through the setup menu on my CPAP machine looking at results.
"Last 7 days - AHI: 0."
Huh?
No apneas?
Not according to Sleepyhead which says I average between 1 and 3 a night.

If you have between 1 and 3 events per (8 hour) night that's a AHI of between 0.1 and 0.4. That's pretty low.

Is your machine set to not display AHI?

Quote:For the Sleephead experts: Does Sleepyhead interpret the data or just take what the machine gives it?

It does some of each. When in the daily view look and see how long these events last. If they have a duration close to 10 seconds I can see how it's possible that the machine is not counting them but SleepyHead is. 10 seconds is the cut-off time. If an event lasts less than 10 seconds it doesn't count as an event. Unless you've gone into the SleepyHead settings and told it to count events that last for less than 10 seconds.

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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
07-28-2013 10:52 PM
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courtney123 Offline

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Posts: 67
Joined: Jun 2013

Machine: REMstar Auto A-Flex
Mask Type: Nasal pillows
Mask Make & Model: F&P Pilairo
Humidifier: None
CPAP Pressure: 11
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Honolulu, Hawaii

Post: #7
RE: Sleepyhead Data Weirdness
I realize my AHI is low enough to consider CPAP therapy a home run for me - especially since my sleep study showed 30/hour.

I'm just curious about the discrepancy between what the machines shows and SleepHead reports.
It's amazing the things we come up with to drive ourselves crazy :-)

Aloha,
MrCourtney
Honolulu, HI
07-29-2013 12:21 AM
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Sleepster Offline
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Posts: 4,989
Joined: Feb 2012

Machine: ResMed AirCurve10 VAuto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: HumidAir and SlimLine Hose
CPAP Pressure: MaxI 13.6 | MinE 5.2 | PS 4.4
CPAP Software: ResScan SleepyHead

Other Comments: Diagnosed Nov 2011. Conquered aerophagia.

Sex: Male
Location: Houston, Texas

Post: #8
RE: Sleepyhead Data Weirdness
My point was that it's so low it's pretty close to the zero that your machine is reporting.

Sleepster
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
07-29-2013 09:23 AM
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