Post Reply 
AHI plus CENTRAL AI equals ???
Author Message
ROSIE Offline

Members

Posts: 18
Joined: Feb 2015

Machine: ResMed Air Sense 10 Auto Set
Mask Type: Nasal pillows
Mask Make & Model: Resmed AirFit P10
Humidifier: ResMed Air Fit 10
CPAP Pressure: 9 to 12
CPAP Software: Not using software

Other Comments:

Sex: Male
Location: San Francisco

Post: #1
AHI plus CENTRAL AI equals ???
Can the reported hourly AHI and Central AI numbers be added together to give the total number of events/hour where the user stopped breathing for at least 10 seconds?? Huhsign
Using the AirSense 10 AUTOSET.
05-28-2015 09:47 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: AHI plus CENTRAL AI equals ???
AHI determined by adding the number of apnea events (obstructive, central, unknown) and hypopnea

An apnea has to last 10 seconds or more to be scored, ResScan shows the duration of apnea in seconds
05-28-2015 10:59 PM
Find all posts by this user Post Reply Quote this message in a reply
quiescence at last Offline

Advisory Members

Posts: 753
Joined: Nov 2014

Machine: REMstar System One with Autoflex
Mask Type: Full face mask
Mask Make & Model: Quattro AirFit F10
Humidifier: yes typical setting = 4
CPAP Pressure: 5-13 Autotritrating CPAP
CPAP Software: SleepyHead EncoreBasic

Other Comments: CMS-50F Plus oximeter /w SPO2 Assistant software. Avowed mouth-breather switching to nose-breathing

Sex: Male
Location: US

Post: #3
RE: AHI plus CENTRAL AI equals ???
Nope. The AHI is the total of all A(Apnea) and H(Hypopnea) per hour. Within the Apnea portion of this, there are OA (obstructive apnea) and Clear Airway Apnea (halts in breathing that do not seem to be obstructive).

One suggested reason there are Clear Airway Apnea is that you simply decide (perhaps sub-consciously) not to breath. The reason given is that the Central Nervous System has incorrectly not stimulated a breath when it should. These occurrences are called Central Apneas.

Hope this didn't just confuse you.

QAL

Dedicated to QALity sleep.
You'll note I am listed as an Advisory Member. I am honored to be listed as such. See the fine print - Advisory Members as a group provide advice and suggestions to Apnea Board administrators and staff concerning Apnea Board operation and administrative policies. 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.
05-28-2015 11:04 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
under pressure Offline

Preferred Members-2

Posts: 139
Joined: Feb 2014

Machine: ResMed Airsense 10 Autoset
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Integrated
CPAP Pressure: 11 - 14
CPAP Software: ResScan SleepyHead

Other Comments: Also use F&P Icon Auto and Z1 Auto for travel and Backup

Sex: Male
Location: Colorado

Post: #4
RE: AHI plus CENTRAL AI equals ???
AI = Apnea Index

AI + Hypopneas Index = AHI

AI ....... Is made up of Central AI and Obstructive AI

Events per hour is just a different way to say AHI


On the sleep report you might see AI which is total Apnea Index and then you might see Central AI which is the portion of the total AI that was composed of Centrals (same as Clear Airway).......then added to the total AI is Hypopneas to give you AHI.

As an example I might wake up and see my AHI at 2.2

My AI might be 1.2 and Central AI is .5

So in that case with a little subtraction if total AI is 1.2 and Central AI was .5 that means my Obstructive Apnea was .7

So the total AI of 1.2 (made up of .5 Central and .7 Obstructive) and 1.0 Hypopneas Index total up to my AHI of 2.2

And remember to have the period on the detailed sleep report set to one day for the numbers to make sense......if it's set for another period like one month the last night figures won't make sense.
(This post was last modified: 05-29-2015 12:03 AM by under pressure.)
05-28-2015 11:57 PM
Find all posts by this user Post Reply Quote this message in a reply
under pressure Offline

Preferred Members-2

Posts: 139
Joined: Feb 2014

Machine: ResMed Airsense 10 Autoset
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Integrated
CPAP Pressure: 11 - 14
CPAP Software: ResScan SleepyHead

Other Comments: Also use F&P Icon Auto and Z1 Auto for travel and Backup

Sex: Male
Location: Colorado

Post: #5
RE: AHI plus CENTRAL AI equals ???
To clarify my last sentence............in order for the "Events Per Hour" (AHI) at the top of the sleep report screen to match the AHI lower on the sleep report (more Info section) you have to have the period set for one day. If you use a different period say for instance one month on the more info section you'll then be getting averages for the period selected.

Be aware on your Airsense machine that if power is removed from the machine, ie. Unplugged, or power failure, the period in the more info section will default back to one month......that has tripped a few people up when trying to match the events per hour for last sleep session with the AHI figure in the more info area of the on-screen sleep report.
05-29-2015 07:09 AM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Upset about central apnea sleepytimegal 6 209 Yesterday 11:54 AM
Last Post: PaulaO2
  ASV/ Central apena - Time for a second opinion? Feisty Folder 6 316 11-21-2016 04:14 AM
Last Post: DeepBreathing
  Central Sleep Apnea? wayne99 8 720 11-20-2016 06:39 AM
Last Post: wayne99
Question Any Way To Reduce Central Sleep Apnea without PAP? DeepThought 7 643 09-07-2016 04:47 PM
Last Post: DeepThought
  Low respiration rate triggers central apnea clusters Grandpapa-G 6 516 09-06-2016 10:57 PM
Last Post: PaytonA
  Clear/Central Apneas, BiPAP, CO2 washout confusion. NorthernGuy 3 476 09-02-2016 09:29 AM
Last Post: PaytonA
  Central Apneas & ASV Users jerrydaw 11 1,124 08-21-2016 04:15 PM
Last Post: ruach

Forum Jump:

Who's Online (Complete List)