"please keep me updated about oximeters "
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Can someone explains what AHI OAI CAI means and how to interpret the numbers?
My AHY is 17 on the info screen of ResMed S9. What does it mean?
I have just started using CPAP the S9. The user manual is
very short and does not explain the screens or what the data means.
Is there a way to download the data at home to my home PC analyze and look at the data and then send it to the clinic for additional analysis?. Is there software for S9 that I can download to do that?
E
Can someone explains what AHI OAI CAI means and how to interpret the numbers below?
I am using ResMed S9 and my presure is 7, AHI= 17.8, OAI 15.5, CAL=0.4
E
Views: 17430
Replies to This Discussion
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Permalink Reply by catfish44 on
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the AHI is the apnea hypopnea index which means you average 17.8 apneas and hypopneas while sleeping per hour, which is interpreted as moderate sleep apnea. OAI is obstructive apnea index which means that 15.5 obstructive apneas is your average per hour. i haven't worked with the S9 machine yet ,but would guess that the software for download is provided only to doctors and DME providers.
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Permalink Reply by Judy on
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CAL ??? Or CAI ??? CAI = central apnea index. The I = Index and Index = per hour in this situation.
We/they prefer to see an AHI less than 5.0 and an AI of less than 1.0. It would be good to know what your Leak rate is.
Yes, there is software for the S9. ResScan 3.10 or 3.11 ResScan is meant for professionals only BUT is available to patients IF their doctor writes a script for it. It is restricted to sale by or on the order of a physician. However, IF you can get your doctor to write a script for it, do NOT buy it from your local DME supplier w/o KNOWING the price they will charge you for it (IF they will sell it to you even w/a script, many won't even w/a script). First check the prices w/a couple of reputable online DME suppliers. Most always they will be considerably cheaper.
The software isn't all that difficult to learn or understand the data. I doubt you would need your local supplier to analyze it for you once you've had a little practice w/it and explored the Manual or the Help function.
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Permalink Reply by David Starobin on
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Hi E -
As a new member, I found the Glossary of Terms very helpful. It's under the FAQ tab at the top of this page. Of course, knowing the jargon is only half the battle. Knowing what the numbers mean, as Catfish shows, is what you need. I love this forum! I was so lost trying to "get this" on my own. This forum has been amazingly helpful.
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I just would like you to know that the hypopneas of the S9, and all ResMed's flowgenerators, are not true hypopneas. To determine a true hypopnea, and additional oximeter is needed to measure a 4% saturation drop. The flowgenerators are very sensitive to flow limitations, and that's what you are looking at. As a healthcare provider I am more interested in the AI (apnea index) than the HI (hypopnea index).
The recently launched S9 flowgenerators measure centrals, but also specify an apnea to 'other' if it cannot determine whether it's a central or an obstructive apnea. It's a neat feature.
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Permalink Reply by Perry mcNeal on
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BM, What should the HI and AI numbers be?
BMHeus said:I just would like you to know that the hypopneas of the S9, and all ResMed's flowgenerators, are not true hypopneas. To determine a true hypopnea, and additional oximeter is needed to measure a 4% saturation drop. The flowgenerators are very sensitive to flow limitations, and that's what you are looking at. As a healthcare provider I am more interested in the AI (apnea index) than the HI (hypopnea index).
The recently launched S9 flowgenerators measure centrals, but also specify an apnea to 'other' if it cannot determine whether it's a central or an obstructive apnea. It's a neat feature.
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It is preferred to see the AI less than 1.0 and the AHI less than 5.0 so a less than 4.0 would be acceptable for most.
My understanding is when titrating your pressure needs they usually determine the lowest pressure needed to stop or prevent all apneas and then raise the pressure again as needed to eliminate or greatly reduce the number of apneas. For a CPAP they would then script the pressure needed to prevent most or all hypopneas. For an APAP they would script 1 cm less than needed to eliminate apneas and 1-3 cms more than needed to stop or greatly reduce all hypopneas.
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HI = Hypopnea index
AI = Apnea index.
Perry mcNeal said:BM, What should the HI and AI numbers be?
BMHeus said:I just would like you to know that the hypopneas of the S9, and all ResMed's flowgenerators, are not true hypopneas. To determine a true hypopnea, and additional oximeter is needed to measure a 4% saturation drop. The flowgenerators are very sensitive to flow limitations, and that's what you are looking at. As a healthcare provider I am more interested in the AI (apnea index) than the HI (hypopnea index).
The recently launched S9 flowgenerators measure centrals, but also specify an apnea to 'other' if it cannot determine whether it's a central or an obstructive apnea. It's a neat feature.
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Permalink Reply by Heather Dent on
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Don't want to rain on anybody's parade here (nor be a smart ass), but the Resmed website says the figure it uses for scoring the AHI, AI and HI is NOT THE AVERAGE. Instead, they use the MEDIAN because it is more "robust" than the average. As a retired teacher I was familiar with using both the median and average figures when calculating student scores (especially on standardized tests when comparing one student's score with all the others in the class) and what Resmed means by more robust is that it is a more accurate measure. Think of the apnea and hypopnea events you have each hour as being listed in order from highest to lowest (much like students' class scores). Drop off the extreme score at each end (highest and lowest) then find the score that is exactly in the middle and that is the MEDIAN. It is considered more accurate than the "average" because the 2 most extreme scores (highest and lowest) which are NOT TYPICAL have been eliminated and not allowed to falsely skew the score (as they do when the average is calculated). Hence, Resmed's comment that the "Median" is a more "robust" figure, which more accurately represents the hourly score for apneas and hypopneas.
Now maybe someone can help me with this question. I recently realized that when I thought I suffered frequently from heartburn, it is actually reflux (or esophogeal reflux). Back 6 months ago upon my very first visit to the sleep doc I was asked if I suffered from reflux and I said no I didn't. QUESTION: Could relux be the cause of my HI score being so much higher than my very low AI score. If I have an AHI of 8.8 then my AI is 0.7 and my HI is 8.1 Another example: if my AHI is 4.3, my AI will be 0.3 and my HI will be 4.0 No matter whether the overall AHI score on CPAP machine are high or low there is always this discrepancy. On my diagnosis sleep study my oxygen level fell drastically (to 71) during hypopneas. Does anyone know if this could be due to reflux? (I am planning to make an app't with the sleep doc to ask about it, but that could take months). Just figured someone could clue me in before then.
Thanks,
Canuck64
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Permalink Reply by Mary Z on
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Canuck64, thanks for the explanation of the difference between average and median.
Sorry I don't have an answer to your GERD question. If you don't get any answers here, I suggest posting it as a new discussion. Also if you have not been following Matt's discussion "Why does CPAP plug my nose and causes acid reflux?" check that discussion out.
Mary Z.
Heather Dent said:Don't want to rain on anybody's parade here (nor be a smart ass), but the Resmed website says the figure it uses for scoring the AHI, AI and HI is NOT THE AVERAGE. Instead, they use the MEDIAN because it is more "robust" than the average.
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