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Quick AHI question
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GrammaBear Offline

Advisory Members

Posts: 381
Joined: May 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: Air Fit P10
Humidifier: ResMed H5i heated humidifier
CPAP Pressure: 12.2 - 16.2
CPAP Software: SleepyHead

Other Comments: Type 1 diabetes - using Tandem T-slim insulin pump, Dexcom G4 CGM

Sex: Female
Location: northern Illinois

Post: #1
Quick AHI question
I've been reading the various posts about trying a large size pillow for the Air Fit P10 mask. Last night is the 2nd time I've tried one and I seem to have good numbers (for me) with that pillow. I should know the answer to my question, but I don't - so please have patience.

The leak number was only 2L/min
AHI - 1.1
Total AHI - 0.8

How come the difference in the two numbers. There was 0 central so I'm really confused how the machine comes up with the numbers it did.
09-21-2014 12:02 PM
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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: Quick AHI question
(09-21-2014 12:02 PM)GrammaBear Wrote:  AHI - 1.1
Total AHI - 0.8

How come the difference in the two numbers. There was 0 central so I'm really confused how the machine comes up with the numbers it did.
AHI = Apnea Index (AI) + Hypopnea Index (HI) = 1.1

AI = obstructive + central + unknown = 0.8

The difference in the two numbers is Hypopnea Index (HI), AHI - AI = 1.1 - 0.8 = 0.3 ... HI = 0.3
09-21-2014 12:26 PM
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vsheline Offline

Advisory Members

Posts: 1,908
Joined: Jul 2012

Machine: S9 VPAP Adapt (USA Model# 36007, not better 36037 or 36067)
Mask Type: Full face mask
Mask Make & Model: F10 or SimPlus w/ 2Liners. MirageQuatro & Gecko gel pad
Humidifier: H5i
CPAP Pressure: 15 EPAP, PS 5-10
CPAP Software: ResScan

Other Comments: Marfan Syndrome, chronic bradycardia, occasional Cheyne-Stokes Respiration

Sex: Male
Location: California, USA

Post: #3
RE: Quick AHI question
(09-21-2014 12:26 PM)zonk Wrote:  
(09-21-2014 12:02 PM)GrammaBear Wrote:  AHI - 1.1
Total AHI - 0.8

How come the difference in the two numbers. There was 0 central so I'm really confused how the machine comes up with the numbers it did.
AHI = Apnea Index (AI) + Hypopnea Index (HI) = 1.1

AI = obstructive + central + unknown = 0.8

The difference in the two numbers is Hypopnea Index (HI), AHI - AI = 1.1 - 0.8 = 0.3 ... HI = 0.3


Hi GrammaBear,

Zonk's answer (which is same as mine would have been) assumes you meant:
AHI - 1.1
Total AI - 0.8

Take care,
--- Vaughn

Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment. The Advisory Member group provides advice and suggestions to Apnea Board administrators and staff on matters concerning Apnea Board operation and administrative policies - not on matters concerning treatment for Sleep Apnea. I think it is now too late to change the name of the group but I think Voting Member group would perhaps have been a more descriptive name for the group.
09-21-2014 04:13 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: #4
RE: Quick AHI question
What those numbers really mean is you are doing great Gramma! You go girl!
09-21-2014 10:15 PM
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Sleep2Snore Offline

Preferred Members

Posts: 33
Joined: Aug 2014

Machine: REMstar
Mask Type: Nasal pillows
Mask Make & Model: Adam
Humidifier: REMstar or F&P HC150
CPAP Pressure: 18
CPAP Software: Not using software

Other Comments:

Sex: Male
Location: Scotland

Post: #5
RE: Quick AHI question
(09-21-2014 12:02 PM)GrammaBear Wrote:  I've been reading the various posts about trying a large size pillow for the Air Fit P10 mask. Last night is the 2nd time I've tried one and I seem to have good numbers (for me) with that pillow. I should know the answer to my question, but I don't - so please have patience.

The leak number was only 2L/min
AHI - 1.1
Total AHI - 0.8

How come the difference in the two numbers. There was 0 central so I'm really confused how the machine comes up with the numbers it did.
You are doing great, don't worry about numbers to much, as long as you don't feel tired. A lot of people would give their right arm for an AHI as low as that Smile
09-22-2014 03:04 PM
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Clementine Offline

Preferred Members-2

Posts: 208
Joined: Sep 2013

Machine: ResMed VPap Auto
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10
Humidifier: ResMed H5i--not using currently
CPAP Pressure: Auto -- 8/13.2 PS 3.2
CPAP Software: SleepyHead

Other Comments: Began with machine on 7/7/14.

Sex: Female
Location: eastern Iowa

Post: #6
RE: Quick AHI question
oh my, yes. I am still working toward something below 5.
09-23-2014 10:43 AM
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