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Odd Low Level Leak
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richcrab Offline

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Posts: 5
Joined: Aug 2016

Machine: Resmed AirSense 10
Mask Type: Nasal pillows
Mask Make & Model: Resmed AirFit P10
Humidifier: AirSense 10
CPAP Pressure: 11/15
CPAP Software: SleepyHead

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Sex: Male
Location: Boston, MA

Post: #1
Odd Low Level Leak
Hi all. I recently replaced my three month old AirFit P10 with a new mask (thank you insurance); same size same model. However, I am finding a constant leak rate. For example, with my old mask I might have long periods of no leakage registering, interrupted by an occasional spike or two. With the new mask, I get a constant baseline leak around 2.0-3.0 and spikes occur off that baseline. That is not the way it looked under the old mask.

To me, it seems to suggest some sort of ongoing and oddly constant leak at a low level. I've attached a JPG to show this.

Any ideas? Thanks.


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10-08-2016 06:55 AM
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AlanE Offline

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Posts: 1,496
Joined: Mar 2015

Machine: ResMed AirSense 10 Autoset
Mask Type: Nasal pillows
Mask Make & Model: P10 & Mirage Liberty backup
Humidifier: Built-in
CPAP Pressure: 10-14
CPAP Software: ResScan SleepyHead

Other Comments: ʕ•ᴥ•ʔ So Long, and Thanks for All the Fish

Sex: Male
Location: Southwest Florida

Post: #2
RE: Odd Low Level Leak
Compared to mine, your leak rate is very low. Mine hovers around 25 all night.

[Image: Leak08-oct-16.PNG]



Using FlashAir W-03 SD card in machine. Access through wifi with FlashPAP or Sleep Master utilities.

I wanted to learn Binary so I enrolled in Binary 101. I seemed to have missed the first four courses. Big Grinnie
10-08-2016 08:45 AM
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Sleeprider Online
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Posts: 3,381
Joined: Dec 2014

Machine: Resmed Aircurve 10 Vauto
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: Resmed Climateline
CPAP Pressure: Auto Bilevel 18/9, PS 3
CPAP Software: ResScan SleepyHead EncoreBasic

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Sex: Male
Location: Where they make Respironics

Post: #3
RE: Odd Low Level Leak
Maybe they have redesigned the exhaust diffuser mesh a bit. There were complaints it was not flowing freely after washing. I don't know if that was true or not, but several threads dealt with that. A slightly freer flow might show up as a low-level leak in comparison.

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10-08-2016 09:08 AM
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Rcgop Offline

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Posts: 215
Joined: May 2016

Machine: Resmed AirSense 10 autoset
Mask Type: Nasal pillows
Mask Make & Model: AirFit P10
Humidifier: installed
CPAP Pressure: 6.0 - 10.0 / EPR 2
CPAP Software: SleepyHead

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Sex: Male
Location: Orlando Fl

Post: #4
RE: Odd Low Level Leak
Yep, it's the mask. Same thing happened to me. My first mask started at 2.0 until I got my first replacement. My new mask started at 0 unless I had a real leak. It was very plain this was happening because the day I changed to my new mask I had taken a nap with the old mask. You could see the difference in the two sessions. For a test, several days later, I changed back and the 2 liters per min leak came back. I tryed cleaning the old mask with no change. I can't say this a defect or not, or will change anything, but it is very real.

HuhDont-knowI am an accountant so any advice given here is not medical. If I give any financial advice, you can take it to the bank. However, you will have a hard time cashing it in. Okay
10-08-2016 11:26 AM
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justMongo Offline

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Posts: 3,853
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

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Sex: Male
Location: Калифорния

Post: #5
RE: Odd Low Level Leak
I suspect it's an artifact of the calculation of leak rate.

The machine has to find the baseline for the absolute flow from the machine; I assume by numerical integration of the flow waveform.
Then subtract a mask vent rate at the measured pressure -- probably a table lookup.
The difference is the calculated leak rate.

If they did increase the vent rate, it wouldn't match the table; and the resulting leak rate would be calculated as higher.
Following that logic, it's the mask...

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.
10-08-2016 04:12 PM
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richcrab Offline

Members

Posts: 5
Joined: Aug 2016

Machine: Resmed AirSense 10
Mask Type: Nasal pillows
Mask Make & Model: Resmed AirFit P10
Humidifier: AirSense 10
CPAP Pressure: 11/15
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Boston, MA

Post: #6
RE: Odd Low Level Leak
Thanks of the thoughts everyone. So is the point here that the new mask is more or less the same as the old mask (which it should be), but that the leak calculation is starting from a different baseline? Or is the point that there is some sort of constant leak or maybe even defect in the new mask, and it should be addressed? Sorry, it wasn't entirely clear to me. Thanks.
10-08-2016 06:46 PM
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justMongo Offline

Monitors

Posts: 3,853
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #7
RE: Odd Low Level Leak
I'm thinking they increased the vent rate of the mask. That tricks the machine into thinking there is a 2 LPM unintended leak.

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.
10-08-2016 09:14 PM
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