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Mask Seal and L/Min
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chuck6161 Offline

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Posts: 24
Joined: Jul 2016

Machine: Resmed autoset s10
Mask Type: Nasal pillows
Mask Make & Model: Resmed p10
Humidifier: Resmed
CPAP Pressure: 8-20
CPAP Software: ResScan

Other Comments:

Sex: Male
Location: Australia

Post: #1
Mask Seal and L/Min
Hi, if the threshold for normal leakage is 24L/Min, then why do I keep getting a smiley face, for mask seal, when I go over it.

I'm using a chinstrap but it seems to get loose with my tossing and turning during the night. I am a mouth breather but never liked the idea of a full mask.

I was just wandering whether the leakage over 24L/min is a big issue, and at what level should I really start to worry, considering my machine is giving me a smiley face for mask seal everyday.

Thanks
10-08-2016 03:39 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: #2
RE: Mask Seal and L/Min
Ignore the smiley face. It's too forgiving.
The machine can maintain pressure up to 24 LPM.
Not included in that figure is the vent rate of the mask.

There may be some design margin built into the 24 LPM number; but, all bets are off as far as delivering proper therapy above the 24 LPM leak rate.

Most of us have short periods where we exceed 24. If ResScan is showing more than an occasional leak spike, you should troubleshoot the source of the leak. With your P10, the most common source of leak is from the mouth.

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.
(This post was last modified: 10-08-2016 04:03 PM by justMongo.)
10-08-2016 04:02 PM
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PaytonA Offline
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Posts: 3,013
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #3
RE: Mask Seal and L/Min
Your machine is very forgiving like all of our Resmed machines. You will have to go over 24 l/min for over 30% of the time to get a frowny face. Many of us on this board ar fairly hard line about the 24 l/min limit but I have seen Resmed articles that seemed to say that 30 l/min is OK.

I personally like to shoot for 0 l/min and achieved that fairly consistently for an extended period of time but something changed ( still using the same FFM and hoses and machine with no setting changes). Still have not figured out what changed but I am not beating myself up over it. Figured it must be aliens and let it go at that.

Best Regards,

PaytonA
10-08-2016 04:28 PM
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pholynyk Offline

Advisory Members

Posts: 306
Joined: Mar 2015

Machine: ResMed AirSense 10 APAP
Mask Type: Full face mask
Mask Make & Model: Amara View
Humidifier: included
CPAP Pressure: 11-17
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Ontario, Canada

Post: #4
RE: Mask Seal and L/Min
You will only get the red frowny face when you exceed the 24 L/min redline for about one third of your session time. The leakage number shown on the screen sleep report is the 95 percentile value - if your report period is set to 1 day. For example, today my leakage was reported as 28 L/min, and SleepyHead reported 16% of the session time was over redline - so: Happy Face.

The problem with excessive leakage is that the machine may fail to maintain pressure accurately, and/or the the total flow may exceed the range of the flow rate sensor. In either case your therapy and event recording are compromised.

SHa_biggrin5 For extra credit, the interested student is invited to take their machine apart, identify the sensors, and find their spec sheets. Please report back, so I don't take mine apart...SHa_biggrin5
10-08-2016 05:23 PM
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PaytonA Offline
Wiki Editor
Monitors

Posts: 3,013
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #5
RE: Mask Seal and L/Min
(10-08-2016 05:23 PM)pholynyk Wrote:  The problem with excessive leakage is that the machine may fail to maintain pressure accurately, and/or the the total flow may exceed the range of the flow rate sensor. In either case your therapy and event recording are compromised.

I think the question is-at what leakage rate does that happen? If my memory is correct, the ability to consistently identify apneas is the first thing that becomes questionable and then if the leakage is way too high and you are using a high pressure the machine loses its ability to maintain the pressure when the total leak gets close to the capacity of the pump. You can see that when it can not maintain the set pressure.

Best Regards,

PaytonA
10-08-2016 07:35 PM
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chuck6161 Offline

Preferred Members

Posts: 24
Joined: Jul 2016

Machine: Resmed autoset s10
Mask Type: Nasal pillows
Mask Make & Model: Resmed p10
Humidifier: Resmed
CPAP Pressure: 8-20
CPAP Software: ResScan

Other Comments:

Sex: Male
Location: Australia

Post: #6
RE: Mask Seal and L/Min
This is from last night.


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10-09-2016 02:45 AM
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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: Mask Seal and L/Min
Looks like you are opening your mouth. Have you tried a chin strap?

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.
10-09-2016 05:30 AM
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chuck6161 Offline

Preferred Members

Posts: 24
Joined: Jul 2016

Machine: Resmed autoset s10
Mask Type: Nasal pillows
Mask Make & Model: Resmed p10
Humidifier: Resmed
CPAP Pressure: 8-20
CPAP Software: ResScan

Other Comments:

Sex: Male
Location: Australia

Post: #8
RE: Mask Seal and L/Min
(10-09-2016 05:30 AM)justMongo Wrote:  Looks like you are opening your mouth. Have you tried a chin strap?

I have a chin strap but I think it gets itchy during the night and I may be scratching and it loosens up lol.

Last night was pretty good, it was only 8L/min so I'm going to try and get used to it and then buy a FFM if I need to.

Thanks to all that replied. Much appreciated.
10-09-2016 06:56 PM
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