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Q re apnea stats on ResMed S9
Was wondering how to count apneas/hypopneas on the ResMed S9.
If the numbers are: AHI, 11.2; Total AI, 10.8; and Central AI 9.5, how does that all add up?
Would it mean that if total AI is 10.8 that would mean there is 1.3 Obstructive apneas, with 9.5 central ones?
And if AHI is 11.2 does that mean there were .4 hypopneas in addition to the OAs & CAs?
And if .4 per hour, I guess that is an average/per hour for the entire night?
Thanks again for helping me try to figure out and understand what is going on?
Views: 1035
Replies to This Discussion
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Permalink Reply by RockRpsgt on
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I am not sure how that particualr machine configures AHI. In the lab the central index is not included in the AHI. Only obstructive apneas and hypopneas configure into this index. So I would read that index as 10.8 AI, .4 HI, and a CI of 9.5.
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I believe that your beliefs are wrong this time. In none of the labs that I have worked in have centrals been included in the Apnea Hypopnea Index. This index is for obstructive events only. In a lab setting the AHI is used to determine the severity of obstructive apnea and for split criteria. We do not split for centrals by themselves.
"The Principals and Practices of Sleep Medicine" 4th edition by Roth, Kryger, and Dement defines AHI as a threshold or index used to define or measure Obstructive Sleep Apnea Syndrome (OSAS).
"The Fundamentals of Sleep Technology" by Nic Butkov and Teofilo Lee-Chiong define AHI as an index used to classify the severity of OSAS in objective measures.
I will admit that not all of the definitions are as specific in mentioning AHI in correlation with obstructive events as these 2 sleep textboooks. In searching through many publications this evening I did find that they did all have one thing in common. Not one definition mentioned central events.
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On the internet I get varying definitions for AHI. Some listed include centrals while others list AHI and CAI as 2seperate measurements. Most of the textbooks on the subject define it completely different. I am sure that this most likely varies from lab to lab or doc to doc as well.
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Well of course chest is going to include centrals in any index used to evaluate SBDs. The entire AARC claim over sleep is based on central apneas and the treatment there of.
j n k said:Chest sums it up nicely:
"Apneas and hypopneas were manually evaluated following published indications. Total AHI was calculated as the number of apneas and hypopneas per hour of total sleep time (TST). Central apneas were subtracted from the total number of events to calculate the obstructive AHI (oAHI)."--CHEST / 133 / 3 / MARCH, 2008, p. 671.
http://chestjournal.chestpubs.org/content/133/3/670.full.pdf
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I agree ;) I just was not sure how that machine scored centrals.
j n k said::-)
Good point.
And I agree that in the context of sleep medicine, "AHI" is often used in a shorthand way to mean "oAHI," especially in labs that specialize in treating OSA.
But until home sleep machines get effort belts, or get better at differentiating centrals from obstructives, home-machine AHI will likely continue to include all central events, since all that the machine really knows for sure is that flow reduced a certain amount, compared to baseline, for 10 seconds. Thus, in the context of home-machine-estimated "AHI," I believe that centrals get included, even the perfectly harmless ones. That is one limitation (out of many) of home-machine data, although home-machine data is still very, very useful for trending, in my opinion.
-jnk
Rock Hinkle said:Well of course chest is going to include centrals in any index used to evaluate SBDs. The entire AARC claim over sleep is based on central apneas and the treatment there of.
j n k said:Chest sums it up nicely:
"Apneas and hypopneas were manually evaluated following published indications. Total AHI was calculated as the number of apneas and hypopneas per hour of total sleep time (TST). Central apneas were subtracted from the total number of events to calculate the obstructive AHI (oAHI)."--CHEST / 133 / 3 / MARCH, 2008, p. 671.
http://chestjournal.chestpubs.org/content/133/3/670.full.pdf
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Permalink Reply by Maryann on
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I also use a ResMed S9. This is my first machine and I have only had it for about three weeks. I don't seem to be able to get any of my numbers. Is there something that I need that is not included with the machine to get my numbers. I use the Resmed Mirage Quatro full face mask. Some nights will be good but other nights it will leak all night it seems. I clean it every day and make sure my face is super clean before I go to bed. I just can't figure out what I am doing wrong. Night before was very good with very few leaks but last night was terrible. I would appreciate any help with these problems. Thanks.
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Mary,
In the future could you send this type of info via the PM system. These types of post could cause some of our more anal lab managers and medical directors to condemn these sites. Such a practice would make it hard for us techs to participate.
TY
Rock
Mary Callahan said:On the ResMed S9 Auto machine: Plug in machine and turn the Push Dial until the device is showing the Home position (Home Icon illuminated). In Home position, press the Push Dial and the Setup Menu buttons down simultaneously for 3 seconds. The clinician menu will appear. Select parameter(s) you wish to modify with the Push Dial (push down to select, turn to modify). When done, select thehome choice from the displayed menu and the adjustment is saved.
If you need/want the entire manual you may find it here on sleepguide.com I am sure someone here can tell you how to get it. Usually we are not given the manuals from the home care companies for some bizarre reason.
Basa said:I also use a ResMed S9. This is my first machine and I have only had it for about three weeks. I don't seem to be able to get any of my numbers. Is there something that I need that is not included with the machine to get my numbers. I use the Resmed Mirage Quatro full face mask. Some nights will be good but other nights it will leak all night it seems. I clean it every day and make sure my face is super clean before I go to bed. I just can't figure out what I am doing wrong. Night before was very good with very few leaks but last night was terrible. I would appreciate any help with these problems. Thanks.
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Permalink Reply by Mary Callahan on
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Don't know where to find out box. ONly can see in box. Where is it?
99 said:
Please use the PM (Private Messages) system
Where to find
Sign in out box
Please delete your comments and resend them privately
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Permalink Reply by 99 on
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the in box is the same as the out box and display werther you have signed in or not
Mary Callahan said:
Don't know wher to find out box. ONly can see in box. Where is it?
99 said:Please use the PM (Private Messages) system
Where to find
Sign in out box
Please delete your comments and resend them privately
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