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Tired99
Unread post  Post subject: definition of hypopnea  |  Posted: Sat Dec 10, 2016 8:45 am

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From Wikipedia:

In the context of diagnosis and treatment of sleep disorders, a hypopnea is not considered to be clinically significant unless there is a 30% (or greater) reduction in flow lasting for 10 seconds or longer and an associated 4% (or greater) desaturation in the person's O2 levels, or if it results in arousal or fragmentation of sleep.

Three Questions:

1) Is this the best definition?

2) Is a drop in O2 from 90% to 86% a 4% desaturation or is it a 3.6% desaturation?

3) How is a 30% drop in flow rate identified?


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TheLankyLefty
Unread post  Post subject: Re: definition of hypopnea  |  Posted: Mon Dec 19, 2016 9:58 am
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Tired99 wrote:
1) Is this the best definition?
Yes

Tired99 wrote:
2) Is a drop in O2 from 90% to 86% a 4% desaturation or is it a 3.6% desaturation?
For a sleep lab it's 4%. We don't have equipment that sensitive. Really only arterial blood gas is accurate in getting SPo2 values, but a needle plunged into the arm would FOR SURE wake people up. :o

Tired99 wrote:
3) How is a 30% drop in flow rate identified?
Nadir to nadir for length of the event, and a 30% decrease in the airflow sin wave that is measured in microvolts. Sounds complicated maybe...but it's not.

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Pat50
Unread post  Post subject: Re: definition of hypopnea  |  Posted: Wed Nov 22, 2017 8:36 am

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Great definition


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Tootsy
Unread post  Post subject: Re: definition of hypopnea  |  Posted: Wed Jun 20, 2018 12:50 pm

Joined: Wed Jun 20, 2018 12:35 pm
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Hi Jason! It's Niall from Ireland. I hope you're keeping well. We have very few sleep centres over here that carry out PSG; however most centres perform limited polysomnography (nasal cannula, oximeter, chest & abdomen belts). How is an arousal accurately determined in this test? Does a significant change in the body belts suggest an arousal?


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TheLankyLefty
Unread post  Post subject: Re: definition of hypopnea  |  Posted: Wed Jun 20, 2018 9:31 pm
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Tootsy wrote:
most centres perform limited polysomnography (nasal cannula, oximeter, chest & abdomen belts). How is an arousal accurately determined in this test?
Limited tests are basically attended Type 3 home sleep tests. Arousals aren't accurately determined other than visually by the night technologist....but without EEG even this isn't completely accurate.

Tootsy wrote:
Does a significant change in the body belts suggest an arousal?
It can be a clue to the whole puzzle, but it still isn't enough information to accurately predict arousals with certainty.

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Tootsy
Unread post  Post subject: Re: definition of hypopnea  |  Posted: Wed Jun 20, 2018 10:24 pm

Joined: Wed Jun 20, 2018 12:35 pm
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Thanks! Great YouTube videos. Keep up the amazing work.


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ryes_silver
Unread post  Post subject: Re: definition of hypopnea  |  Posted: Thu Jul 05, 2018 10:56 pm

Joined: Thu Jul 05, 2018 3:19 am
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Wiki editors must have superior writing skills- they always have the best definitions.


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