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Correlation AHI and Mask Fit
#1
Correlation AHI and Mask Fit
I am looking for the some information to help me interpret my readings for the last 2 weeks.  My mask is AirFit F20 and the machine RemStar Auto AFlex System One.   During the past two weeks I have had an average AHI of 3.65 and and average mask fit of 32.8.  Intuitively it seems that both these numbers cannot be accurate.  How do I interpret these two numbers?  Is there a correlation between AHI and Mask Fit; what is the margin of error in the machine readings; how do you know if the machine is malfunctioning - my provider can only check the pressure.

I do not want to get into the weeds;  I would just like to understand - big picture - the relationship between these two measurements.  In regard to my mask fit,  I do know that my lower jaw has a tendency to drop dramatically (I have tried a chin strap), and I am sure the lower margin of the mask gets disturbed.
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#2
RE: Correlation AHI and Mask Fit
Getting into "THE WEEDS" is the only way to make a correlation. Your System One Auto CPAP is supported by the free SleepyHead software, which can show you exactly what is happening in terms of leaks, your respiration and events and the machine response. In general, leaks reduce the capability of the machine to detect and respond to events, but they also disturb your sleep and may cause arousals and some events related to that. Give the software a try, and we can probably significantly reduce events by optimizing some settings.

Your System One machine may be getting close to a replacement time. Insurance usually will replace machines on a 5-year interval. When that time comes, you might want to consider a new Resmed Airsense 10 Autoset for Her. It would probably drop your events to less than 1.
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#3
RE: Correlation AHI and Mask Fit
Welcome to the forum.

The best way to see what is happening is to look at your Sleepyhead data.  This will give you info down to the breath by breath basis when it is needed.  The OTA info is a summary that is designed to encourage compliance and provide minimal info,

Your AHI is 3.65, what is the break down of your events.  Different types of events require different treatment and Sleepyhead will show you those.
See my signature to download and organize your charts.

Fred
New to Apnea? Helpful tips to ensure success
Mask Primer
Dealing with a DME
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Organize Charts
Attaching Charts

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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#4
RE: Correlation AHI and Mask Fit
Thank you for your comments.  I don't get a replacement machine until 2020.  It's a dinosaur, for sure.  What settings can be changed?
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#5
RE: Correlation AHI and Mask Fit
How would you describe the different types of events and different treatment?
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#6
RE: Correlation AHI and Mask Fit
(01-27-2019, 11:01 AM)Potamantha Wrote: Thank you for your comments.  I don't get a replacement machine until 2020.  It's a dinosaur, for sure.  What settings can be changed?

On your machine, the settings that can be changed are the mode (auto or CPAP), the minimum and maximum pressure and comfort settings like AFlex and Humidity.  Knowing what settings should be changed means knowing more about your needs.

Does your machine have a SD card in the slot in the top-center of the flow generator?
Do you have a PC or Mac that can be used to install SleepyHead?
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#7
RE: Correlation AHI and Mask Fit
(01-27-2019, 11:04 AM)Potamantha Wrote: How would you describe the different types of events and different treatment?

Obstructive Apneas
Hypopneas
Central Apneas
Mask Leaks
Mouth Breathing
RERA
Hypoxia
Determining which class of machine would best fit your apnea

For various treatments read the contents of my first link in my signature.  That should get you started
New to Apnea? Helpful tips to ensure success
Mask Primer
Dealing with a DME
Download SleepyHead
Organize Charts
Attaching Charts

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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