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Leakage vs. AHI
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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: #11
RE: Leakage vs. AHI
(05-18-2014 09:26 PM)PaytonA Wrote:  
(05-18-2014 04:55 PM)diamaunt Wrote:  
(05-18-2014 10:07 AM)Peter_C Wrote:  But, your AHI and all other reading will be suspect unless you can keep your leak rate below the magic line (I think 24Lpm??) - gesh, I always go brain-dead on that number.

according to the resmed autoset manual, the max flow it can handle at 20cmh2o is 136lpm. at 12cmh2o, it says it's good for 164lpm.

seems that there should be plenty of breathing room over that 24lpm.

The 24 lpm is over and above the vent rate which if memory serves is 20-50 lpm. The real problem however is not the ability to supply the air but its ability, with increased air flow to sense the things that it responds to and to sense the apneic events.

Best Regards,

PaytonA

BINGO~! My point and concern. I cannot find any good data to learn at what point will *my* machine not be able to accurately read and understand events due to leaks?

I slept very well last night with my 'Wisp'. But the leak rate bounced between 20-30l/p, and showed an AHI of 7 (good for me) - but the graphs didn't show any jaggies - more like curves - so am thinking data was degraded.

Again, minor or random leaks - no biggie - but sustained higher leaks?? That makes me wonder if I should cave to the FFM and just suffer?

*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."
05-19-2014 11:13 AM
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Yveylise Offline

Members

Posts: 11
Joined: May 2014

Machine: Fisher & Paykel Icon Novo
Mask Type: Nasal mask
Mask Make & Model: Zest Q
Humidifier: unsure
CPAP Pressure: 13
CPAP Software: SleepyHead

Other Comments: Currently using loaner machine: REMstar Auto A-flex with F&P Pilario Mask

Sex: Female
Location: Alabama, USA

Post: #12
RE: Leakage vs. AHI
Sorry for the newbie question guys but..

Is leak rate how much air is flowing out around the mask?
And what is AHI?

-Amy
05-19-2014 11:45 AM
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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: #13
RE: Leakage vs. AHI
(05-19-2014 11:45 AM)Yveylise Wrote:  Sorry for the newbie question guys but..

Is leak rate how much air is flowing out around the mask?
And what is AHI?

-Amy

Generally when we talk about leak rate we're talking about air that unintentionally escapes from under the mask, through the mouth, out the ears, whatever.

The ahi is basically an average number of apnea events you experience per hour overnight. It is comprised of several types of events and is a guideline to decide how effective your therapy is. It is considered you are doing great if it is under 5, but ideally it will be well under 5.
05-19-2014 12:31 PM
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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: #14
RE: Leakage vs. AHI
Slight change to average acceptable AHI - '5' is the number to shoot for (if possible), as in an AHI of '5' or less. However, depending on many factors, like how severe your OSA untreated is, getting an AHI of '10' can be completely wonderful~! I was in the 90+ untreated camp, and can count on one hand the number of days at 5 or less in the last year.

The true *test* is are you sleeping better? Waking up less? Having less fatigue during the day? Is your blood O2 maintaining during the night?

Generally, leak rate and AHI are the two 'biggies' to watch - some like to chase numbers and read charts all day (which is fine), but I just want good sleep...

*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."
05-19-2014 01:06 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: #15
RE: Leakage vs. AHI
(05-19-2014 11:45 AM)Yveylise Wrote:  Sorry for the newbie question guys but..

Is leak rate how much air is flowing out around the mask?
And what is AHI?

-Amy
Unfortunately the machine listed in your user profile 'Machine: Fisher & Paykel Icon Novo' is not data capable machine. Icon Novo does not report any efficacy data, just how many hours using the machine each night . Icon Auto and Icon Premo are data capable machines

Icon family http://www.fphcare.com.au/sleep-apnea/cpap-devices/f-p-icon/
05-19-2014 04:09 PM
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