Post Reply 
What do AHI, AI and Total AI mean?
Author Message
TomR1 Offline

Members

Posts: 14
Joined: Jul 2012

Machine: ResMed s9
Mask Type: Full face mask
Mask Make & Model:
Humidifier: S9
CPAP Pressure: 4-12
CPAP Software: Not using software

Other Comments:

Sex: Male
Location:

Post: #1
What do AHI, AI and Total AI mean?
My fullface mask simply blows off my face at 12cm pressure. At 9cm I have no problem.

At 11.8 maximum I have a month's data on my Resmed showing AHI as 1.2. However when I drop to 10.8 it increases to between 2 and 3.

What dos all this mean. I heard that Resmed reports high and anything below 4 is normal. is this true?

Tom
09-28-2012 05:33 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
zonk Offline

Advisory Members

Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #2
RE: What do AHI, AI and Total AI mean?
Anything below 5 considered good therapy
Whats the leak
09-28-2012 06:00 PM
Find all posts by this user Post Reply Quote this message in a reply
JudgeMental Offline

Advisory Members

Posts: 324
Joined: Feb 2012

Machine: Respironics DreamStation Auto-CPAP
Mask Type: Full face mask
Mask Make & Model: Respironics Amara View
Humidifier: Respironics
CPAP Pressure: 11-14
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Florida USA

Post: #3
RE: What do AHI, AI and Total AI mean?
Well Tom, I'll add a little info here that will hopefully help you to understand some of the things about AHI..
The initials AHI stands for apnea-hypopnea index. The AHI is a hourly total of your obstructive apneas+hypopneas+central apneas. It is a summation of those three (3) items recorded hourly.
Therefore when you change your pressure sometimes, it will cause more central apneas to appear or perhaps change some other piece of the index. It appears to me that when your pressure is reduced, as you say, to 10.8, then you must be having more apneas in the range between 10.8- 11.8. If you are holding a AHI for a month at 1.2, then I would suggest you try a different mask. It shouldn't be blowing off your face at 11.8. Just because your mask stays on your face at AHI of 9 , it is not giving you the air pressure to keep your airway open satisfactorily.
Your AHI avg. of 1.2 for a months usage is very good. Your pressure should remain in the vacinity of 11.8.
I don;t know anything or I have never heard of ResMed reporting higher numbers but the medical acceptance of an AHI under 5 is considered acceptable therapy.
I don;t know how long you have been using a APAP (at least a month we know), but I think that you should not need for the machine to start at 4 and ramp all the way to 11.8. I would increase the bottom number gradually to around 9 or 10. You should be able to tolerate a 9 by now as a start up pressure.

Yesterday is history; Tomorrow is a mystery; Today is a gift; Thats why its called "The Present".
09-28-2012 06:13 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
zonk Offline

Advisory Members

Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #4
RE: What do AHI, AI and Total AI mean?
Try the mask fit at 12
why not try a nasal mask ... less bulky and maintain better seal during the night
are you using auto 4-12 as in your profile?
You need to look at the software to see whats going on
09-28-2012 06:20 PM
Find all posts by this user Post Reply Quote this message in a reply
TomR1 Offline

Members

Posts: 14
Joined: Jul 2012

Machine: ResMed s9
Mask Type: Full face mask
Mask Make & Model:
Humidifier: S9
CPAP Pressure: 4-12
CPAP Software: Not using software

Other Comments:

Sex: Male
Location:

Post: #5
RE: What do AHI, AI and Total AI mean?
I am a mouth breather and cannot tolerate either a nazel or nazel pillow mask. At 4-12 the mask blows off my face and the leaks wake me up. The Forma mask that I have is supposed to slip under my chin. When it does the mask fits and doesn't leak very much but my nose is uncomfortably squeezed. (Yes i have the large size mask) The Phillips mask is designed to fit under my mouth and above my chin. Also leaks.

I indend to move the ramp starting pressure up. There is a certain logic that says that I am getting apnias after I wake up and reset the ResMed because the ramp starts at 4 and takes 45min to get to max. This is based on a couple of days using my Transcend set at 9. I did not see an increase in apnias.

For some reason the ResScan software won't run on my computer but I can see the report on the machine.
09-28-2012 07:04 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
PaulaO2 Offline
Wiki Editor
Moderators

Posts: 8,068
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: What do AHI, AI and Total AI mean?
Acronyms - http://www.apneaboard.com/wiki/index.php?title=Acronyms

There's a specific set of steps to installing ResScan. If you don't follow it, it won't install or work. There's a bunch of stuff to do to completely remove it and try again. It's a driver issue.

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.
09-28-2012 07:07 PM
Find all posts by this user Post Reply Quote this message in a reply
zonk Offline

Advisory Members

Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #7
RE: What do AHI, AI and Total AI mean?
If you have Mac computer ... ResScan don,t work
you need SleepyHead

The software tells us more than just AHI and 95% pressure and leak
It tell us whats going on breath by breath and when those apnea events occurred and how long lasted in seconds
The machine cannot tell if you were asleep or awake
Everyone is different. I would turn Ramp off and let the machine do its own thing adjusting the pressure as needed. No point setting the minimum pressure at 4 if you need 8 or 9 to treat your apnea and it,ll cause more leak as pressure ramp up
09-28-2012 07:36 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
JudgeMental Offline

Advisory Members

Posts: 324
Joined: Feb 2012

Machine: Respironics DreamStation Auto-CPAP
Mask Type: Full face mask
Mask Make & Model: Respironics Amara View
Humidifier: Respironics
CPAP Pressure: 11-14
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Florida USA

Post: #8
RE: What do AHI, AI and Total AI mean?
You have a very large window between 4 and 12..especially if you also have a 45 min ramp time. A lot of apneas can appear during that long time at such a low pressure. IF you are using the machine in the CPAP mode then I suggest you raise your starting pressure to around 9 to 10.; and set the ramp to 10min. If you are using the machine in the APAP mode, I would set the bottom at 9 and the top around 12.5-13.

Yesterday is history; Tomorrow is a mystery; Today is a gift; Thats why its called "The Present".
09-28-2012 07:42 PM
Find all posts by this user Post Reply Quote this message in a reply
trish6hundred Offline

Advisory Members

Posts: 6,452
Joined: May 2012

Machine: Resmed S9 AutoSet for Her
Mask Type: Full face mask
Mask Make & Model: Fisher & Paykel Simplus
Humidifier: H5i Heated Humidifier
CPAP Pressure: 10 - 7-20 Cm H2O
CPAP Software: Not using software

Other Comments: I started CPAP in 2008. Totally blind since birth.

Sex: Female
Location: Missouri, USA

Post: #9
RE: What do AHI, AI and Total AI mean?
Hi TomR1, WELCOME! to the forum.!

trish6hundred
09-28-2012 08:25 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
TomR1 Offline

Members

Posts: 14
Joined: Jul 2012

Machine: ResMed s9
Mask Type: Full face mask
Mask Make & Model:
Humidifier: S9
CPAP Pressure: 4-12
CPAP Software: Not using software

Other Comments:

Sex: Male
Location:

Post: #10
RE: What do AHI, AI and Total AI mean?
More info:

I set the ramp startuo at 9 the maximum to 11 and thightened the mask down to eliminate leaks. The tight mask was uncomfortable but AHI was 0.6.

What I THINK this tells me is that the apnias were occuring during the ramp or when a leak essentially reduced the pressure. What do you think?
09-29-2012 03:42 PM
Find all posts by this user Post Reply Quote this message in a reply
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  newbie and total time in apnea JenJen 6 559 09-10-2016 09:51 PM
Last Post: PoolQ
  Can CPAP therapy cause Total Clear Airway Apneas TheLionSleeps 3 608 07-17-2016 08:39 PM
Last Post: WakeUpTime
  Newbie, need help with FitLife Total Face DaveD 7 796 01-22-2016 03:44 PM
Last Post: DaveD
  Total Newbie - Help!!! Please... Josh 60 3,996 11-11-2015 06:45 PM
Last Post: Josh
  Finding total use hours Breathetonight 6 1,319 02-18-2015 09:16 AM
Last Post: Breathetonight
  total mask tupeloman38801 7 1,441 01-22-2015 08:27 AM
Last Post: tupeloman38801
  SH: Total Leak less than Leak Rate! AshSF 3 1,251 01-18-2015 11:45 PM
Last Post: AshSF

Forum Jump:

Who's Online (Complete List)