Why are hypopneas 10 seconds long?

[Rcgop]

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.

[srlevine1]

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/

[0rangebear]

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

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.

[Rcgop]

No need to post. Every hypopnea ever registered since the beginning is exactly 10seconds. No more, no less.

[justMongo]

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:

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.

[chill]

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.

[justMongo]

The Canadian version is in metric seconds.

[Dafod]

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.

[Sleepster]

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.

[OpalRose]

On my PR System One, I see hypopneas with a duration greater than 10 seconds.