What is a normal AHI number on CPAP

This area is for CPAP Mask and CPAP Machine Related Questions used in the treatment of Sleep Apnea.


  • Site Supporter

What is a normal AHI number on CPAP

Postby AirForceOne » Mon Jun 14, 2010 11:50 am

Just curious if everyone on CPAP is supposed to have a AHI number less than 5. My number during the sleep study was 49 per hour. I've been on a machine for about 3 weeks now. For the first week, the AHI number kept increasing and peaked at 15.7. During the second week, the 7-day average started decreasing and bottomed at 7.6. It's now increasing again and is 8.5. Is there a certain level where something needs to be done (e.g., it's too high)? I do have some central apneas (periodic breathing) so without bringing the SD Card to the doctor or DME (was told to wait for 90 days of data), I'm not sure why the AHI is going up and down.
Respironics PR SYSTEM ONE REMSTAR AUTO, Resmed Mirage Quattro full face mask. Too new to list AHI, etc., because my levels are changing. CPAP Study: AHI: 49 (includes centrals), Pressure: 16, Oxygen 70%
AirForceOne
 
Posts: 28
Joined: Mon Apr 12, 2010 8:29 pm

Re: What is a normal AHI number on CPAP

Postby Todzo » Tue Jun 15, 2010 1:31 am

AirForceOne wrote:Just curious if everyone on CPAP is supposed to have a AHI number less than 5. My number during the sleep study was 49 per hour. I've been on a machine for about 3 weeks now. For the first week, the AHI number kept increasing and peaked at 15.7. During the second week, the 7-day average started decreasing and bottomed at 7.6. It's now increasing again and is 8.5. Is there a certain level where something needs to be done (e.g., it's too high)? I do have some central apneas (periodic breathing) so without bringing the SD Card to the doctor or DME (was told to wait for 90 days of data), I'm not sure why the AHI is going up and down.


Hi AirForceOne!

I just posted a link here about " New Link between Pollution, Temperature and SDB". So pollution and temperature are known factors. As well, I have noted that stress, disease, diet, exercise level, body weight, and age all seem to have their part in my OSA and associated AHI.

The process of creating a prescription for xPAP is very expensive for all. So, I think it is better to let that be if possible and work on the other things I can do to make my prescription work as effectively as possible. I have also noticed that my doctors very well notice my efforts and their interest and efforts for me increase.

It is very good that you are watching this. I think I would consider above 5 something to keep an eye on and above 15 something to call the doctor about IF it remains that way for several days. Do keep a journal if you can.

Onward to restful nights and productive days!

Todzo
Todzo
 
Posts: 685
Joined: Tue Jul 15, 2008 6:41 am
Location: Seattle, WA

Postby drowsy_jack » Wed Jun 30, 2010 11:12 pm

My ahi went from 16 during study to 12 under two weeks of cpap, not much improvement.
What I'm wondering is , is this data accesible to the user on most machines, or only by the doctor. My nurse said no. I will be using a respironics latest model...
drowsy_jack
 
Posts: 15
Joined: Sun Jun 20, 2010 1:03 pm
Location: Northern California
Machine: Respironics System One
Mask: Mirage Quattro
Humidifier: Yes
Year Diagnosed: 2010

Postby djoshua00 » Thu Jul 01, 2010 8:54 am

My first night on CPAP was last night. My AHI was 6.1 on side before CPAP and 37 on back. Last night it registered 3.5 for the night.
djoshua00
 
Posts: 9
Joined: Wed Jun 23, 2010 11:21 am

Same Results

Postby AirForceOne » Thu Jul 01, 2010 9:19 am

Drowsy Jack: My results were about the same. My AHI was 49 during the CPAP study and it took a pressure of 16 to stop my apneas. I've been using the PR System One Auto for about 5 weeks and my AHI was high and not coming down. Since my machine wasn't locked, I modified the settings for a minimum start-up pressure of 13 instead of 4.0. That seemed to help. My apneas are now in the 8 range (still too high, I think) but the 90% level is 15.8 and I'm not sure what else to do.
Respironics PR SYSTEM ONE REMSTAR AUTO, Resmed Mirage Quattro full face mask. Too new to list AHI, etc., because my levels are changing. CPAP Study: AHI: 49 (includes centrals), Pressure: 16, Oxygen 70%
AirForceOne
 
Posts: 28
Joined: Mon Apr 12, 2010 8:29 pm

Postby CrohnieToo » Thu Jul 01, 2010 10:06 am

drowsy_jack wrote:My ahi went from 16 during study to 12 under two weeks of cpap, not much improvement.
What I'm wondering is , is this data accesible to the user on most machines, or only by the doctor. My nurse said no. I will be using a respironics latest model...

What brand and model CPAP are you using, DrowsyJack? Some models of CPAP are only compliance data capable, others are fully data capable, that is they can provide Leak, AHI, AI and other data relative to your sleep each night. Some models are even capable of providing at least the Leak, AHI and AI via the LED screen as well as even more data via proprietary software. (Compliance data is just the usage data, i.e. how many hours a night it has been used and how many nights it has been used).
ResScan 3.10 - Resmed S8 ResLink & oximeter
ConTec CMS-50D+ oximeter - Philips EverFlo 5L Oxygen Concentrator
PR SystemOne BPAP Auto w/Bi-Flex & Humidifier - EncorePro 2.2.14.0
User avatar
CrohnieToo
 
Posts: 7943
Joined: Mon Mar 20, 2006 9:18 pm
Location: Mid-Michigan
Machine: Resmed S8 VPAP Auto
Mask: Resmed Quattro FX Small
Humidifier: Resmed H3i
Year Diagnosed: 2006

Postby drowsy_jack » Thu Jul 01, 2010 10:27 am

CrohnieToo wrote:What brand and model CPAP are you using, DrowsyJack? Some models of CPAP are only compliance data capable, others are fully data capable, that is they can provide Leak, AHI, AI and other data relative to your sleep each night. Some models are even capable of providing at least the Leak, AHI and AI via the LED screen as well as even more data via proprietary software. (Compliance data is just the usage data, i.e. how many hours a night it has been used and how many nights it has been used).


I'll be using the Respironics PR SYSTEM ONE REMSTAR AUTO when I get my new machine in a couple of weeks.
drowsy_jack
 
Posts: 15
Joined: Sun Jun 20, 2010 1:03 pm
Location: Northern California
Machine: Respironics System One
Mask: Mirage Quattro
Humidifier: Yes
Year Diagnosed: 2010

Postby ApexAZ » Fri Jul 02, 2010 6:36 pm

Your machine should be reducing your AHI to < 5.
Brian
Severe OSA
19/15 cmH2O
PR SystemOne BiPAP Auto
F&P Forma Full Face Mask
ApexAZ
 
Posts: 574
Joined: Wed Jun 24, 2009 12:25 pm

Postby terrydk » Mon Jul 05, 2010 5:49 pm

According to this article on OSA and weight gain you should have an AHI of <5 to be considered as having no OSA. http://www.sciencedaily.com/releases/2009/06/090611071355.htm Moderate it says is 5-15 and Severe is anything over 15. Mine was 126 during my sleep study so I was diagnosed as very severe. I started my therapy late last December, my last 4 months of data are:
AI = .1
AHI = 2.8

I have seen an AI of 0.0 for many nights but haven't seen anything lower than .9 for an AHI. It does take some time, it took me about 2 months to get used to everything and finally see my numbers get down into the <5 range.
ResMed Auto II
H4i Humidifier
Quatro Full Face Mask
terrydk
 
Posts: 9
Joined: Tue Dec 22, 2009 4:58 pm

Postby Vicki » Mon Jul 05, 2010 6:02 pm

Science News did not get it right. OSA does not jump from mild to severe. AHI is the Apnea-Hypopnea Index and is the number of events/hour.

Mild AHI = 5 - 14
Moderate AHI = 15 - 30
Severe AHI >30

So, as an example, say you sleep 7 hours and you have 126 events the whole night. Then your AHI = 18 which is in the moderate catagory. My AHI is 114.

But honestly, aside from being knowledgable and educated about this disorder it doesn't matter. People with mild OSA can feel just as bad as people with severe. It also depends on other factors, how much you desaturate, the length of apneas, etc. And the bottom line is that we are all brought back to an AHI < 5 (which is theraputic) with a CPAP.

Vicki
Being defeated is often a temporary condition. Giving up is what makes it permanent.
Marilyn Vos Savant

That which does not kill you makes you stronger-Friedrich Nietzsche
Friedrich must of had apnea.
User avatar
Vicki
Moderator
 
Posts: 6355
Joined: Tue May 31, 2005 8:21 pm
Location: Southern California
Machine: DeVilbiss IntelliPAP
Mask: Fisher & Paykel Flexifit 431
Humidifier: Rarely as needed
Year Diagnosed: 1999

Postby Janknitz » Mon Jul 05, 2010 8:36 pm

I'll be using the Respironics PR SYSTEM ONE REMSTAR AUTO when I get my new machine in a couple of weeks.


That particular machine IS data capable, but you'll have to purchase the software to get anything useful. All that the machine will report on the LED screen is your 7 and 30 day average AHI's and your 7 and 30 day average 90% pressures, and whether you have any periodic breathing. If you look at the numbers in the morning, you can get a ball park idea of whether or not it was a "good night" but that's about all. You need the software to really see what's happening.

And for those of you with AHI's over 5, you need to look at your data to see what is going on. Over 5 is TOO HIGH, but you are taking shots in the dark to adjust things without data to guide you (and so is your doctor if he or she never looks at your data!). Your too high numbers may be due to leakage, pressure settings that are too high (causing more centrals to be counted in your AHI), too low (obstructive and AI's aren't being properly treated), too narrow or widely ranged, you could be having clusters of events at certain pressures (e.g. your AHI may be 8 and if you sleep 7 hours that means 56 events, but perhaps 30 of those events could be clustered over a particular stage of sleep in a 1 or 2 hour window), and a myriad of other factors.

The whole point of having a data capable machine is to be able to look at things like that.

Air Force One, you shouldn't be "flying blind"!
Phillips Respironics System One Auto A-flex and Humidifier
Encore Viewer 2.0 Software
Swift FX
Janknitz
 
Posts: 1163
Joined: Tue Feb 23, 2010 9:05 pm

Postby terrydk » Mon Jul 05, 2010 11:13 pm

Vicki wrote:Science News did not get it right. OSA does not jump from mild to severe. AHI is the Apnea-Hypopnea Index and is the number of events/hour.

Mild AHI = 5 - 14
Moderate AHI = 15 - 30
Severe AHI >30

So, as an example, say you sleep 7 hours and you have 126 events the whole night. Then your AHI = 18 which is in the moderate catagory. My AHI is 114.

But honestly, aside from being knowledgable and educated about this disorder it doesn't matter. People with mild OSA can feel just as bad as people with severe. It also depends on other factors, how much you desaturate, the length of apneas, etc. And the bottom line is that we are all brought back to an AHI < 5 (which is theraputic) with a CPAP.

Vicki


Just for clarification my AHI averaged 126 per hour for the night, the 126 wasn't the total.
ResMed Auto II
H4i Humidifier
Quatro Full Face Mask
terrydk
 
Posts: 9
Joined: Tue Dec 22, 2009 4:58 pm

Postby Vicki » Tue Jul 06, 2010 4:38 am

Terrydk,

Oh yeah, you win the highest AHI prize :-D . I am glad you are getting treated! I can't imagine with that many apneas you were getting nearly enough oxygen!

Vicki
Being defeated is often a temporary condition. Giving up is what makes it permanent.
Marilyn Vos Savant

That which does not kill you makes you stronger-Friedrich Nietzsche
Friedrich must of had apnea.
User avatar
Vicki
Moderator
 
Posts: 6355
Joined: Tue May 31, 2005 8:21 pm
Location: Southern California
Machine: DeVilbiss IntelliPAP
Mask: Fisher & Paykel Flexifit 431
Humidifier: Rarely as needed
Year Diagnosed: 1999



  • Site Supporter

  • Similar topics
    Replies
    Views
    Author

Return to CPAP Mask, Machine, & Monitoring Treatment Questions

Who is online

Users browsing this forum: Yahoo [Bot] and 1 guest