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Sandra_ON Offline

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Posts: 39
Joined: Feb 2014

Machine: ResMed S9 with 5i humidifier
Mask Type: Nasal pillows
Mask Make & Model: Airfit P10
Humidifier: ResMed 5i
CPAP Pressure: 5/11
CPAP Software: Not using software

Other Comments:

Sex: Female
Location: Eastern Ontario, Canada

Post: #1
AHI
I'm new to CPAP, just into my third week. I'm wondering why my AHI varies so much. Some nights it's .2 and others, like last night 2.1.
02-09-2014 08:39 AM
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Peter_C Offline

Advisory Members

Posts: 1,308
Joined: Sep 2013

Machine: System One DS960HS
Mask Type: Full face mask
Mask Make & Model: Mirage Quattro "MED"
Humidifier: Attached
CPAP Pressure: Auto mode-script is:15/3/3
CPAP Software: EncoreBasic Other Software

Other Comments: Severe obstructive sleep apnea 1999/Just got an ASV machine

Sex: Male
Location: Akron, Ohio USA

Post: #2
RE: AHI
Totally normal. Be happy, as the 'goal' is to try to stay below '5.0'. I'm usually between 5.0-10.0.

Welcome to the forumSmile

*I* am not a DOCTOR or any type of Health Care Professional. My thoughts/suggestions/ideas are strictly only my opinions.

"Only two defining forces have ever offered to die for you. Jesus Christ and the American Soldier. One died for your Soul, the other for your Freedom."
02-09-2014 08:43 AM
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Bompa Offline

Monitors

Posts: 854
Joined: Mar 2012

Machine: DreamStation Pro
Mask Type: Nasal pillows
Mask Make & Model: Nuance Pro
Humidifier: DreamStation Heated Humidifer
CPAP Pressure: 12.0
CPAP Software: SleepyHead Other Software

Other Comments:

Sex: Male
Location: Falkenburg,

Post: #3
RE: AHI
(02-09-2014 08:39 AM)Sandra_ON Wrote:  I'm new to CPAP, just into my third week. I'm wondering why my AHI varies so much. Some nights it's .2 and others, like last night 2.1.

Those are great numbers!!! keep it up.
Coffee
02-09-2014 09:28 AM
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trish6hundred Offline

Advisory Members

Posts: 6,424
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: #4
RE: AHI
Hi Sandra_ON,
WELCOME! to the forum.!
Your numbers are great as they are below 5 which is where they should be, sounds like you are off to a GREAT start, keep up the good work.
Hang in there for more responses to your post and best of luck to you with your CPAP therapy.

trish6hundred
02-09-2014 11:10 AM
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GreyParrot Offline

Preferred Members

Posts: 53
Joined: Dec 2013

Machine: ResMed S9 Elite
Mask Type: Full face mask
Mask Make & Model: Mirage Quattro
Humidifier: H5i-Unused
CPAP Pressure: 12.5
CPAP Software: ResScan

Other Comments:

Sex: Male
Location:

Post: #5
RE: AHI
I've wondered about that as well. My numbers are similar to yours.
Most nights are under 1.0. Then I have a couple days over 3.0.
The majority under 5.0. Then perhaps once a month or less I'll have
an 8.0 or 10.0 for no reason I can find other than on those really
bad nights I have increased mask leaks.
02-09-2014 11:42 AM
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Sleepster Offline
Wiki Editor
Moderators

Posts: 4,988
Joined: Feb 2012

Machine: ResMed AirCurve10 VAuto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: HumidAir and SlimLine Hose
CPAP Pressure: MaxI 13.6 | MinE 5.2 | PS 4.4
CPAP Software: ResScan SleepyHead

Other Comments: Diagnosed Nov 2011. Conquered aerophagia.

Sex: Male
Location: Houston, Texas

Post: #6
RE: AHI
It's normal for the AHI to fluctuate, especially when you're new to CPAP therapy.

I liken it to measuring the humidity in the air. The measurement is no where near as precise as the measurement of the temperature of the air. That is to say, if you measure the temperature of the air in a room ten times, you might get numbers that vary by less than a degree. If you measure the humidity ten times you may get numbers that vary by as much as 5%.

Many people who are new to the measuring of the humidity are surprised by this.

The same is true of measurements of the AHI.

Sleepster
Apnea Board Moderator
www.ApneaBoard.com


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.
02-09-2014 12:31 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: #7
RE: AHI
(02-09-2014 08:39 AM)Sandra_ON Wrote:  I'm new to CPAP, just into my third week. I'm wondering why my AHI varies so much. Some nights it's .2 and others, like last night 2.1.
AHI at or below 5 is normal, I would not pay much attention to AHI at this stage of therapy. how you feel is important as well as, finding a comfortable mask, getting decent sleep, customize the machine to your preference (humidity, ramp, epr), and of course leak number
btw, user profile shows "CPAP Pressure: 3.5" ... 4 is the lowest setting
02-09-2014 12:48 PM
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herbm Offline

Preferred Members-2

Posts: 852
Joined: Jan 2014

Machine: ResMed AutoSet S9
Mask Type: Oral
Mask Make & Model: ResMed Airfit P10 Nasal Pillow
Humidifier: ResMed H5i
CPAP Pressure: 11-16
CPAP Software: ResScan SleepyHead

Other Comments: Backup Mask: Innomed Hybrid FFM -- Oral+Nasal Pillows

Sex: Male
Location: Austin, TX

Post: #8
RE: AHI
+1 to all the other answers, you have great numbers.

But here are some reasons for variations:

If you lie awake a long time without sleeping your machine is likely to mark some events that were NOT apneas and that happened while you were awake so these (and the time) would not really count. Much of the time my apneas are MUCH more heavily present in the "awake" periods falling asleep, or when awakening and trying to "stay in bed" hoping to go back to sleep.

Congestion: can play a big role.

Body position: Generally most people have more apneas (>AHI) sleeping on their back than on their side.

Humidity and corresponding machine settings

Your mask -- changing masks, especially the TYPE of mask might cause small variations

Excessive leak -- contrary to what many of us think at first, SOME LEAK is both expected and even a DESIGN feature of the CPAP masks (if it doesn't leak you can't really exhale and purge the CO2) but leak that overwhelms your machines ability to deliver rated pressure is very likely to change your numbers. That is a LOT of leak but it's possible.

All the other things you are supposed to do to take care of yourself, e.g., alcohol consumption or some drugs and medicines can alter your breathing and thus your AHI.

There are more, but these are some things that can alter the AHI.

You might consider keeping a sleep log and adding your daily activities that affect sleep and breathing.

But note again, 0 to 4.9 is good even if it is more fun to be "close to 0". Smile

Sweet Dreams,

HerbM
Sleep study AHI: 49 RDI: 60 -- APAP 10-11 w/AHI: 1.5 avg for 7-days (up due likely to hip replacement recovery)

"We can all breathe together or we will all suffocate alone."
02-09-2014 02:59 PM
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Tez62 Offline

Monitors

Posts: 837
Joined: Feb 2013

Machine: Resmed S9 Autoset
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: Resmed
CPAP Pressure: 5-15
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Melbourne, Australia

Post: #9
RE: AHI
Welcome Sandra _ON, what you want to compare it to is what your AHI was at your first sleep study for example if you have servere sleep apnea with an AHI of over 30 per hour, you are down to one or two per hour. Lots of things effect our AHI even when you have been on CPAP for a long time, weather, medication, what we eat, etc, etc, etc. Every night is a different night so it will never be the same, good luck.
02-09-2014 03:01 PM
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Sandra_ON Offline

Preferred Members

Posts: 39
Joined: Feb 2014

Machine: ResMed S9 with 5i humidifier
Mask Type: Nasal pillows
Mask Make & Model: Airfit P10
Humidifier: ResMed 5i
CPAP Pressure: 5/11
CPAP Software: Not using software

Other Comments:

Sex: Female
Location: Eastern Ontario, Canada

Post: #10
RE: AHI
My AHI in my sleep study was 9 so my apnea is fairly mild. I'm having problems with mouth breathing. Sometimes my chin strap works, sometimes not but I do like the pillow mask. I'm not sure what the respiratory therapist will recommend for a mask when I see him next week. I really don't like the idea of a full face mask.
02-09-2014 04:35 PM
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