Resmed S9 AHI number?

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aaronb
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Resmed S9 AHI number?

Post by aaronb » Wed Sep 10, 2014 11:48 pm

When I go into the sleep report on my Resmed S9, it tells me my AHI...

A few questions:

1) Is that AHI from the last time I used it or an average?

2) How accurate is that AHI compared to the AHI I got from my sleep study? The AHI on my Resmed S9 is much higher than the sleep study AHI.

Thanks!
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kaiasgram
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Re: Resmed S9 AHI number?

Post by kaiasgram » Wed Sep 10, 2014 11:51 pm

Your first question -- it depends on which menu you're in. If you haven't done so yet, check out the S9 video tutorial at the link in my signature box. In one menu the reported AHI is for the last night. In another you can vary it to reflect last night, week, month, etc.

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Re: Resmed S9 AHI number?

Post by LSAT » Thu Sep 11, 2014 5:34 am

aaronb wrote:When I go into the sleep report on my Resmed S9, it tells me my AHI...

A few questions:

1) Is that AHI from the last time I used it or an average?

2) How accurate is that AHI compared to the AHI I got from my sleep study? The AHI on my Resmed S9 is much higher than the sleep study AHI.

Thanks!
Your sleep study was for a few hours...probably months ago. Your S9 shows an accurate AHI for the period set on your machine...usually the past night. The sleep study will not match your current night. AHI will vary slightly from night to night.

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Nick Danger
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Re: Resmed S9 AHI number?

Post by Nick Danger » Thu Sep 11, 2014 6:53 am

AHI measured by the S9 may overstate your actual AHI. For example, I tend to wake up in the morning and listen to the radio for half an hour before getting up. Because I am awake, my breathing is under conscious control and isn't as regular as when I am asleep. These irregularities are sometimes scored as clear airway events by the CPAP machine - thus increasing my AHI. But, they aren't really apneas or hypopneas - it is just that when I am lying in bed listening to the radio, I'll occasionally not breathe within a 10 second interval (maybe it's a quiet passage in the music, maybe I'm stretching, or any of a number of reasons). At the sleep study, they don't count those false events because they know you're awake - the CPAP doesn't know you are awake.

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Re: Resmed S9 AHI number?

Post by aaronb » Mon Sep 15, 2014 12:07 am

I don't use my cpap when I am awake. Once I awake, I rip that damn mask off my face asap..lol

So I can say for sure the AHI on my S9 is my actual AHI? Because my AHI on my sleep study is only about 12 but my AHI on my S9 is 25!
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kaiasgram
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Re: Resmed S9 AHI number?

Post by kaiasgram » Mon Sep 15, 2014 12:14 am

aaronb wrote:I don't use my cpap when I am awake. Once I awake, I rip that damn mask off my face asap..lol

So I can say for sure the AHI on my S9 is my actual AHI? Because my AHI on my sleep study is only about 12 but my AHI on my S9 is 25!
What is the breakdown of that AHI of 25 (obstructive, hypopnea, clear airway)?

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archangle
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Re: Resmed S9 AHI number?

Post by archangle » Mon Sep 15, 2014 12:21 am

Get the free SleepyHead program and it will tell you a lot more about your AHI.

AHI may vary a lot between the lab and your home CPAP machine for many reasons.

You may sleep differently at home due to nervousness, sleep position, having wires everywhere, etc.

The sleep lab only counts apnea events when you're "asleep" in terms of your EEG readings. You might have a lot of events when you're in the transition state between wake and sleep.

Even when a trained technician reads a sleep study and "scores" it, you may get a considerable difference between two different techs. While this sounds bad, it's probably just a question of how you "score" the breathing events that are on the borderline in terms of being bad enough to count. Two different CPAP machines may also give somewhat varying readings.

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Re: Resmed S9 AHI number?

Post by zoocrewphoto » Mon Sep 15, 2014 12:22 am

aaronb wrote:I don't use my cpap when I am awake. Once I awake, I rip that damn mask off my face asap..lol

So I can say for sure the AHI on my S9 is my actual AHI? Because my AHI on my sleep study is only about 12 but my AHI on my S9 is 25!

Is the ahi from the sleep study from the diagnosis (no cpap) phase or the titration (cpap) phase?

Do you have a copy of your sleep study?

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Re: Resmed S9 AHI number?

Post by Pugsy » Mon Sep 15, 2014 7:46 am

If your AHI using the S9 is twice what your AHI is without cpap then something is wrong.
If you aren't wearing the mask while awake...and only using it for sleep times and not spending any time awake with the mask on....something is wrong.

Please post an image of a typical night using the software available...see the links in my signature for information on Sleepyhead software that works with the S9 if you don't already have it. You need to know what that AHI is made up of...that's VERY important. Specifically how much of it might be centrals (if you are having centrals). If you are having a truckload of centrals and you know for sure you weren't awake during the time where the centrals are occurring then you may need a different type of machine.

How to post images of your reports is talked about here
Screen shot thread viewtopic.php?f=1&t=81072&p=737779#p737779

So...please....what is that AHI made up of?
Central index...
Obstructive apnea index...
Hyponea index....
This information is critical.

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aaronb
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Re: Resmed S9 AHI number?

Post by aaronb » Thu Sep 18, 2014 9:22 am

OK that sounds very complicated..

I just want to make sure my cpap is doing its job.

When I go into the "hidden options" in my S9, I see the report for last night's usage. It gives me an AHI of 21...

A few questions:

1) What is the ideal AHI I should have?

2) If my AHI is constantly staying around 21, does that mean my pressure needs to be increased?
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Pugsy
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Re: Resmed S9 AHI number?

Post by Pugsy » Thu Sep 18, 2014 9:26 am

aaronb wrote:1) What is the ideal AHI I should have?
Generally we like for it to be less than 5.
aaronb wrote:2) If my AHI is constantly staying around 21, does that mean my pressure needs to be increased?
Maybe, maybe not. If the AHI is primarily central more pressure won't fix it and might make it worse
and that's I asked this question
Pugsy wrote:So...please....what is that AHI made up of?
Central index...
Obstructive apnea index...
Hyponea index....
This information is critical.

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Re: Resmed S9 AHI number?

Post by tan » Thu Sep 18, 2014 1:50 pm

Pugsy wrote:
aaronb wrote:1) What is the ideal AHI I should have?
Generally we like for it to be less than 5.
"Generally" is the key word here. It can be different. In my case, I don't feel quite myself with AHI over 3 and if it is close to 5, I am really tired. But my respiratory disturbance index (RDI) is quite high: 17. AHI alone is not a reliable indicator

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Re: Resmed S9 AHI number?

Post by aaronb » Fri Sep 19, 2014 12:07 pm

Pugsy wrote:If your AHI using the S9 is twice what your AHI is without cpap then something is wrong.

If you are having a truckload of centrals and you know for sure you weren't awake during the time where the centrals are occurring then you may need a different type of machine.
Curious, what type of machine are you referring to?
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Re: Resmed S9 AHI number?

Post by Pugsy » Fri Sep 19, 2014 12:35 pm

What type of machine depends on what type of apnea events you are having that are numbering more than is expected.
So it depends on the diagnosis and what's going on with you.
For people with a high central count per hour that is normally one of the ASV types of machines but might be something else.
At this point we don't have a clue what is going on with you other than your AHI number is high and that could be from anything.
If you can't figure out how to use the software to see what is going on then you need to get with your DME and have them print you off a copy.

You for sure don't want to go increasing the pressure until you understand fully what is going on and if you can't figure out the event category breakdown for your AHI...there's no way to understand what is going on.

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aaronb
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Re: Resmed S9 AHI number?

Post by aaronb » Sat Sep 20, 2014 11:48 am

Pugsy wrote:What type of machine depends on what type of apnea events you are having that are numbering more than is expected.
So it depends on the diagnosis and what's going on with you.
For people with a high central count per hour that is normally one of the ASV types of machines but might be something else.
At this point we don't have a clue what is going on with you other than your AHI number is high and that could be from anything.
If you can't figure out how to use the software to see what is going on then you need to get with your DME and have them print you off a copy.

You for sure don't want to go increasing the pressure until you understand fully what is going on and if you can't figure out the event category breakdown for your AHI...there's no way to understand what is going on.

OK, I will have to buy a SD card reader first.

Thank you!
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