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robgb Offline

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Machine: ResMed S9 Elite
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Post: #1
Comment about AHI Stats
This morning I woke up feeling as if I had gotten a terrific night's sleep. As always, I checked my stats in Sleepyhead and was surprised to discover that my AHI was 10.5.

What I noticed in the graphs, however, is that I had SEVERAL obstructive apneas between 11:00 p.m. and 11:30 p.m. But the next seven hours were relatively incident free. Smooth sailing.

I can only assume that the rough half hour was because of the position I was sleeping in. But I'm curious to know why AHI is averaged out the way it is, because if you go on that one stat alone, it's very misleading.

Obviously, it's better to have a low AHI, but if the majority of the incidents happened in one large cluster over a short period of time, it seems to me that that higher AHI really means nothing in regard to your overall sleep.

Am I wrong about this?
(This post was last modified: 03-13-2013 09:16 AM by robgb.)
03-13-2013 09:15 AM
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cincysinner Offline

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Posts: 20
Joined: Feb 2013

Machine: Looking
Mask Type: Nasal pillows
Mask Make & Model: ResMed S9 VPAP Auto
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CPAP Pressure: 13/8
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Sex: Male
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Post: #2
RE: Comment about AHI Stats
I had noted this also in another thread but seems to me AHI is a somewhat poor indicator of sleep quality unless that number is very high. If you have an AHI of 60, your sleep is definitely going to be of poor quality but if it is, say 10, it may or may not be bad.

Having 20 events in 1.5 hours then having no events for the next 7 means you probably got some good sleep versus having 20 events scattered throughout the night.

My 2 cents anyways (no science to back it up :-) )
03-13-2013 09:54 AM
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zonk Offline

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Machine: A10 AutoSet
Mask Type: Nasal mask
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Sex: Male
Location: Australia

Post: #3
RE: Comment about AHI Stats
(03-13-2013 09:15 AM)robgb Wrote:  Am I wrong about this?
No you,re not wrong. how you feel is better indicator
AHI is an average per hour, calculated by dividing number of apnea events by hours of sleep

Sometimes, I had few days with most of evens occurred in the 1/2 hour or early in the morning when laying in bed awake, talking, coughing, blowing my nose. Such events are discarded for true AHI value
03-13-2013 03:43 PM
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Ugly Offline

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Machine: ResMed S9 AutoSet
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Other Comments: Hydrocephalus, myopia, depression, chronic ugliness, stupidity, tinnitus, mixed sleep apnea.

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Location: Barrie Ontario Canada

Post: #4
RE: Comment about AHI AI HI Stats
(03-13-2013 09:15 AM)robgb Wrote:  This morning I woke up feeling as if I had gotten a terrific night's sleep. As always, I checked my stats in Sleepyhead and was surprised to discover that my AHI was 10.5.

That reminds me....

From what I was reading through I need to know....

I have been led to believe that the S9 AutoSet will display AHI only?
And if I need to find the AI and/or HI I need to use SleepyHead or ResScan?

This is the conclusion I got from reading through the manual last night but I'm asking since - maybe I missed something.
Unless I'm being screwed again it should be less than a week now.

Also I made note of every available model number for the AutoSet
36005
36015
36025
36105
36115
36125
36145
36205
36245

And every available model number for the Escape Auto
36002
36012
36302
36362

Are there any others? To be absolutely sure of what they're sticking me with next week I want to make sure I have a complete list since I fear that despite my explicit words and the prescription which says "AutoCPAP" I may get the runaround.
03-14-2013 09:53 AM
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PaulaO2 Offline
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Posts: 8,067
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

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Location: western NC, USA

Post: #5
RE: Comment about AHI Stats
Press and hold both the Info and the Setup button. This will enter into a second report area. The second tab in there is the Sleep Report. It reports hours, pressure, leaks, AHI, AI, and CI as well as some other stuff.

I don't know why you are concerned over model numbers. Even an "older" S9 will still be as good as a "newer" one. There's been a lot of discussion here over the firmware upgrades but no conclusions were ever reached. Just look by the power button for the type of S9. Also look at the serial code on the label on the back. I'd not take one that was from any earlier than 2010.

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.
03-14-2013 07:12 PM
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PaulaO2 Offline
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Posts: 8,067
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: #6
RE: Comment about AHI Stats
Oh, and write down the process for looking at the machine hours used. That data cannot be erased. Check this before you sign anything.

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.
03-14-2013 07:15 PM
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