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Why are hypopneas 10 seconds long?
#1
Why is every hypopnea exactly 10 seconds long every time. I understand not being less than 10 seconds, but why never more than 10 seconds? Inquiring minds must know.
HuhDont-knowI am an accountant so any advice given here is not medical. If I give any financial advice, you can take it to the bank. However, you will have a hard time cashing it in. Okay
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#2
(07-31-2016, 04:31 PM)Rcgop Wrote: Why is every hypopnea exactly 10 seconds long every time. I understand not being less than 10 seconds, but why never more than 10 seconds? Inquiring minds must know.

I was wondering about the same thing when I first looked at my SleepyHead data.

I speculated that it was a programming-classification issue -- that anything over 10 seconds that could be classified as a central or obstructive apnea was so classified. That classification shortfalls would be scored as RERAs. As a result of the classification process, we see a preponderance of 10-sec hypops.

If anyone has a definitive answer or alternate hypothesis, I would be interested in hearing it.

You may wish to read the technical discussion on scoring at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3459210/

"The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane." -- Marcus Aurelius
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#3
Please post a night where you have multiple hypopneas that are 10 seconds and let the Brain Bank here the forum do some analysis for you. I assure there will be some good insight if the folks in the forum have some data for analysis



(07-31-2016, 04:31 PM)Rcgop Wrote: Why is every hypopnea exactly 10 seconds long every time. I understand not being less than 10 seconds, but why never more than 10 seconds? Inquiring minds must know.

2004-Bon Jovi
it'll take more than a doctor to prescribe a remedy

Observations and recommendations communicated here are the perceptions of the writer and should not be misconstrued as medical advice.
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#4
No need to post. Every hypopnea ever registered since the beginning is exactly 10seconds. No more, no less.
HuhDont-knowI am an accountant so any advice given here is not medical. If I give any financial advice, you can take it to the bank. However, you will have a hard time cashing it in. Okay
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#5
10 seconds may be an artifact of Sleepyhead. ResScan 5.3 does not assign a duration to a hypopnea.

I believe what I'm saying is what srlevine1 said:
Quote:I speculated that it was a programming-classification issue -- that anything over 10 seconds that could be classified as a central or obstructive apnea was so classified. That classification shortfalls would be scored as RERAs. As a result of the classification process, we see a preponderance of 10-sec hypops.
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.
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#6
It might be a defect in the SH data import for your machine. Or it could be the Airsense, but I'd be surprised if Resmed did not record the duration. I see a variety of times on my Hypopnean with a Phillips Dreamstation.
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#7
The Canadian version is in metric seconds. Laugh-a-lot
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.
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#8
My Airsense 10 only ever records 10sec. My PRS1 records all times from 10sec to 40+ sec. So I guess it's a manufacturer thing.
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#9
I just looked at my data in SH and it does indeed report a duration of 10 seconds, even for hypopneas that last much longer. This looks to me like a mistake in the way SH is interpreting the data from the ResMed A10 machines. When I look at the data recorded by my ResMed S9 I see hypopneas reported with a duration greater than 10 seconds.
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.
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#10
On my PR System One, I see hypopneas with a duration greater than 10 seconds.

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