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ahi reading
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nativedancer Offline

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Posts: 118
Joined: Mar 2015

Machine: Resmed S9 Vpap ST
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Resmed H5i
CPAP Pressure: 17.8/12.4
CPAP Software: Not using software

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Sex: Male
Location: Hell's Half Acre, Piedmont Plain, NC

Post: #1
ahi reading
i don't understand why my ahi readings will be greater, say 15, during the first five hours of sleep, but after a brief wakeup break at 6 am register lower, perhaps 13, for the total 8 hrs or so. does this indicate that the earlier hours had more REM sleep? if this is the case, it seems that the longer i sleep, the lower my ahi will be.
04-26-2015 01:47 PM
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Crimson Nape Offline

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Posts: 1,329
Joined: Oct 2014

Machine: ResMed S9 Autoset
Mask Type: Other
Mask Make & Model: P-10 / F&P Simplus / DreamWear
Humidifier: H5i w/Climateline
CPAP Pressure: 8 - EPR 3
CPAP Software: SleepyHead

Other Comments: CMS-50F & 50IW

Sex: Male
Location: Georgia

Post: #2
RE: ahi reading
It could be you have the ramp turned on. A S9 won't record any events while it's in the ramp mode but it records the time towards total sleep hours. For example: If you had the ramp feature turned on and set to 45 minutes and started your xPAP twice during the sleep cycle, you would go a total of 1½ hours of recorded time without recording any events.

Statistics prove that people who have more birthdays live longer.
04-26-2015 02:09 PM
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nativedancer Offline

Advisory Members

Posts: 118
Joined: Mar 2015

Machine: Resmed S9 Vpap ST
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Resmed H5i
CPAP Pressure: 17.8/12.4
CPAP Software: Not using software

Other Comments:

Sex: Male
Location: Hell's Half Acre, Piedmont Plain, NC

Post: #3
RE: ahi reading
no, the ramp is off. is a puzzlement, yes?
04-26-2015 04:19 PM
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PaulaO2 Offline
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Posts: 8,065
Joined: Feb 2012

Machine: S9 Autoset
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: H5i
CPAP Pressure: 14-20
CPAP Software: SleepyHead

Other Comments: Ehlers-Danlos Syndrome, Hypermobility Type; chronic sarcasm

Sex: Undisclosed
Location: western NC, USA

Post: #4
RE: ahi reading
No, because you forgot time.

I assume you are getting the AHI from the screen?

AHI is total events divided by time.

Let's say you slept 4 hrs and had a total of 48 events. That's an AHI of 12. But if you go back to sleep for another 4 hours and have just 20 events, your total AHI would be 8.5. Those 48 plus the 20 divided by 8hrs (the 2 4hr sessions).

PaulaO2
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www.ApneaBoard.com


Breathe deeply and count to zen.

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.
04-26-2015 04:33 PM
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nativedancer Offline

Advisory Members

Posts: 118
Joined: Mar 2015

Machine: Resmed S9 Vpap ST
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Resmed H5i
CPAP Pressure: 17.8/12.4
CPAP Software: Not using software

Other Comments:

Sex: Male
Location: Hell's Half Acre, Piedmont Plain, NC

Post: #5
RE: ahi reading
ah, paula2, thanks! i never was any good at math! but doesn't this mean simply that i can lower my ahi if i sleep longer?
04-26-2015 06:17 PM
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truetopath Offline

Preferred Members-2

Posts: 421
Joined: Feb 2015

Machine: PR system one 560p auto with a flex
Mask Type: Full face mask
Mask Make & Model: Resumed F10
Humidifier: PR system one
CPAP Pressure: 11
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Lake View, NY

Post: #6
RE: ahi reading
Potentially yes, but I think a pressure increase would lower your ahi more effectively. An AHI of greater than 5 is technically not considered treated. I would talk to your doc before messing around with settings though, especially being on a vpap.
04-26-2015 06:32 PM
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retired_guy Offline

Preferred Members-2

Posts: 2,744
Joined: Jan 2014

Machine: ResMed S9 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: ResMed
CPAP Pressure: 10.6/14, EPR 3
CPAP Software: ResScan SleepyHead

Other Comments: Is it bedtime yet?

Sex: Male
Location: Beautiful, albeit very wet Oregon Coast

Post: #7
RE: ahi reading
The problem with AHI is it doesn't really, on it's own, mean a whole lot. It's simply an average over a number of hours, and is used by the medical community to establish how good or bad is your apnea condition. Much like when you go see your doc the first thing they ask is "How are you?" Answer: "Fine thank you." Response: "My job here is done."

What needs to be considered is how many events are you having. What sort of events are you having (OA, CA, Hypop...) What pressures are you seeing on your machine when you're having them. What is your leak percentages.

Looking at and understanding the relationship of all those things will allow you to treat the condition (the apneas), not just the appearance of the condition (AHI). That's when you will find your sweet spot. At that point you'll see AHI's that are quite low, and proudly will be able to tell your sleep doc "I'm feeling great! Thanks for asking."
04-26-2015 06:40 PM
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PaulaO2 Offline
Wiki Editor
Moderators

Posts: 8,065
Joined: Feb 2012

Machine: S9 Autoset
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: H5i
CPAP Pressure: 14-20
CPAP Software: SleepyHead

Other Comments: Ehlers-Danlos Syndrome, Hypermobility Type; chronic sarcasm

Sex: Undisclosed
Location: western NC, USA

Post: #8
RE: ahi reading
(04-26-2015 06:17 PM)nativedancer Wrote:  ah, paula2, thanks! i never was any good at math! but doesn't this mean simply that i can lower my ahi if i sleep longer?

No, because if you are still having events, the AHI is still going to be high.

And yeah, why are you having an AHI over 5? Work with your doc to get that lower. How are you feeling? Rested?

PaulaO2
Apnea Board Moderator
www.ApneaBoard.com


Breathe deeply and count to zen.

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.
04-26-2015 06:46 PM
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Crimson Nape Offline

Monitors

Posts: 1,329
Joined: Oct 2014

Machine: ResMed S9 Autoset
Mask Type: Other
Mask Make & Model: P-10 / F&P Simplus / DreamWear
Humidifier: H5i w/Climateline
CPAP Pressure: 8 - EPR 3
CPAP Software: SleepyHead

Other Comments: CMS-50F & 50IW

Sex: Male
Location: Georgia

Post: #9
RE: ahi reading
What Retired_Guy said plus you need to look at the duration of each event. Resmed's will record an event on a condition that lasts 10 seconds or longer. A 10 second event is no biggie. However, an event that lasts 30 seconds or longer, or you're having events in clusters, is an area of concern.

Statistics prove that people who have more birthdays live longer.
04-26-2015 06:54 PM
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nativedancer Offline

Advisory Members

Posts: 118
Joined: Mar 2015

Machine: Resmed S9 Vpap ST
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Resmed H5i
CPAP Pressure: 17.8/12.4
CPAP Software: Not using software

Other Comments:

Sex: Male
Location: Hell's Half Acre, Piedmont Plain, NC

Post: #10
RE: ahi reading
thanks, all. doc lowered the pressure from 26/20 to 18/10 because it was too high, couldn't stop the leaks. down to zero leaks now, sleeping well, just need to see some lower numbers. but i'm in no hurry, and i suspect the changes will be gradual.
I do have an upcoming oximeter overnight read coming up.
(This post was last modified: 04-26-2015 08:01 PM by nativedancer.)
04-26-2015 07:44 PM
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