AHI comparison to home sleep study results

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dataq1
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AHI comparison to home sleep study results

Post by dataq1 » Mon Oct 18, 2021 3:26 pm

I am interested in comparing the AHI reported by the Resmed Airsense device and the report of my home sleep study that initiated CPAP therapy.
The Airsense 11 is set up for APAP with an initial ramp of 4 cm for 30 minutes, max pressure of 15.

So the home study (reported by the doctor was 68 hypopneic events, 10 apneic events (1 central) over a 7 hour 14 minutes recording period.
The doctor reports a respiratory Index of 11.

So my question is: Can I compare my home sleep study results with my experience on apap.

MyAir app is telling me that my AHI is (on average) 3.5 over the past week. Is that an improvement over the sleep study (which did NOT involve any sort of pap) ?
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ChicagoGranny
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Re: AHI comparison to home sleep study results

Post by ChicagoGranny » Mon Oct 18, 2021 5:10 pm

Are you asking if an AHI of 3.5 is an improvement over an AHI of 11?

dataq1
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Re: AHI comparison to home sleep study results

Post by dataq1 » Mon Oct 18, 2021 5:56 pm

No, I’m asking if a “respiratory index” is exactly the same as “AHI”. And if they are somehow different, how does one compare to the other.
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palerider
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Re: AHI comparison to home sleep study results

Post by palerider » Mon Oct 18, 2021 6:10 pm

dataq1 wrote:
Mon Oct 18, 2021 5:56 pm
No, I’m asking if a “respiratory index” is exactly the same as “AHI”. And if they are somehow different, how does one compare to the other.
"Respiratory Index" isn't a common term. Perhaps it was "RDI" for Respiratory Disturbance Index?

However, no, and RDI isn't the same as an AHI, AHI is how many apneas or hypopneas you had, on average, per hour. And RDI is how many times breathing issues disturbed your sleep per hour, which is usually higher than the AHI.

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ChicagoGranny
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Re: AHI comparison to home sleep study results

Post by ChicagoGranny » Mon Oct 18, 2021 6:14 pm

AHI - https://www.cpaptalk.com/wiki/index.php ... pnea_Index

RI (Respiratory Index) is a bit informal.
dataq1 wrote:
Mon Oct 18, 2021 3:26 pm
(reported by the doctor was 68 hypopneic events, 10 apneic events (1 central) over a 7 hour 14 minutes recording period.
If you add the apneas and hypopneas and divide by 7 hours 14 minutes, you get 11 which is what this doctor is reporting. So, it seems she is referring to AHI as RI.

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Pugsy
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Re: AHI comparison to home sleep study results

Post by Pugsy » Mon Oct 18, 2021 7:14 pm

Are you sure Respiratory Index???
Is it maybe RI and someone assumed Respiratory Index??

ResMed's ApneaLink home sleep study reports do use RI term but it is Risk Indicator.

see what I said here

https://www.cpaptalk.com/viewtopic.php? ... r#p1397028

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dataq1
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Re: AHI comparison to home sleep study results

Post by dataq1 » Mon Oct 18, 2021 7:55 pm

Quoting from the Drs written report: “An Apnealink air monitoring device was used for the study.”
SUMMARY:
“RESPIRATORY EVENT INDEX: The respiratory event index is 11.”

“IMPRESSION:
1. Mild obstructive sleep apnea
2. Mild nocturnal hypoxia
3. Mild snoring”
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Pugsy
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Re: AHI comparison to home sleep study results

Post by Pugsy » Mon Oct 18, 2021 8:11 pm

Ahhhh.
Otherwise known as RDI or Respiratory Disturbance Index
http://adventures-in-hosehead-land.blog ... -test.html

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ChicagoGranny
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Re: AHI comparison to home sleep study results

Post by ChicagoGranny » Tue Oct 19, 2021 5:13 am

Pugsy wrote:
Mon Oct 18, 2021 8:11 pm
Ahhhh.
Otherwise known as RDI or Respiratory Disturbance Index
http://adventures-in-hosehead-land.blog ... -test.html
If you do the math on the numbers he quoted, RI is equal to AHI. This would mean either they mean AHI by RI, or he had no RERAs during the study. He had a HST which doesn't score RERAs.

But as a practical matter, it seems reasonable to say he is getting significant benefit from CPAP. Also, using OSCAR to optimize his therapy may result in even greater benefit.