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Sleepyhead - Pressure vs Mask Pressure Graphs
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sonicboom Offline

Advisory Members

Posts: 473
Joined: May 2015

Machine: Airsense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10, Dreamwear
Humidifier: Integrated
CPAP Pressure: 4.6-7.6
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Washington

Post: #1
Sleepyhead - Pressure vs Mask Pressure Graphs
I've noticed, without caring too much but now am curious, that the mask pressure data and the machine pressure data do not tend to coincide. For instance, my max pressure is 7 but the max mask pressure last night was 8.98 but only for an instant. I could see no obvious reason for the mask pressure jump (and I see this most nights happening for short blips of time) such as flow limitation up or leak rate up etc... Can someone please explain what the factors are that make the mask pressure rise even when the machine pressure is staying relatively constant but well below the mask pressure? TIA

Coffee
02-26-2016 12:35 PM
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Sleeprider Online
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Posts: 3,324
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: #2
RE: Sleepyhead - Pressure vs Mask Pressure Graphs
While we're at it, how is the mask pressure even sensed? I assume the pressure sensor is actually in the machine, and the mask pressure is interpolated.

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02-26-2016 01:18 PM
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sonicboom Offline

Advisory Members

Posts: 473
Joined: May 2015

Machine: Airsense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10, Dreamwear
Humidifier: Integrated
CPAP Pressure: 4.6-7.6
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Washington

Post: #3
RE: Sleepyhead - Pressure vs Mask Pressure Graphs
Sleeprider - Yes indeed. An additional question I was pondering as well.

Coffee
02-26-2016 03:00 PM
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sonicboom Offline

Advisory Members

Posts: 473
Joined: May 2015

Machine: Airsense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10, Dreamwear
Humidifier: Integrated
CPAP Pressure: 4.6-7.6
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Washington

Post: #4
RE: Sleepyhead - Pressure vs Mask Pressure Graphs
Given the lack of responses I guess no one else has figured this out either.

Coffee
03-05-2016 12:34 PM
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Crimson Nape Offline

Monitors

Posts: 1,327
Joined: Oct 2014

Machine: ResMed S9 Autoset
Mask Type: Other
Mask Make & Model: P-10 / F&P Simplus / DreamWear
Humidifier: H5i w/Climateline
CPAP Pressure: 8 - EPR 3
CPAP Software: SleepyHead

Other Comments: CMS-50F & 50IW

Sex: Male
Location: Georgia

Post: #5
RE: Sleepyhead - Pressure vs Mask Pressure Graphs
I think that while coding SleepyHead it was one of those "Seemed Like A Good Idea At The Time" type of things.

Statistics prove that people who have more birthdays live longer.
03-05-2016 12:47 PM
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PaytonA Offline
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Monitors

Posts: 3,005
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: #6
RE: Sleepyhead - Pressure vs Mask Pressure Graphs
As far as I can see, the mask pressure must be a result of the pressure at the machine reduced by the pressure drop caused by the hose and mask. The 8.98 may be the actual pressure the machine generates in order to give you 7 at the mask. Why it flashes up at the beginning, I do not know.

Best Regards,

PaytonA
03-05-2016 01:17 PM
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sonicboom Offline

Advisory Members

Posts: 473
Joined: May 2015

Machine: Airsense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10, Dreamwear
Humidifier: Integrated
CPAP Pressure: 4.6-7.6
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Washington

Post: #7
RE: Sleepyhead - Pressure vs Mask Pressure Graphs
Certainly a possibility but that doesn't explain the low end either. So some nights the low mask pressure is actually below what the machines can do. For instance, SH is reporting the mask pressure low for last night at 2.96. At the time that occurred the pressure was at 5.7. I use an EPR of 1. So mask pressure should be 4.7 one would think. On most nights SH reports a minimum max pressure of 0. Really? BTW last nights mask pressure high was 8.5. Pressure at that time was 6.99.

Does your mask pressure data report highs and lows that don't match your actual pressures?

Coffee
03-06-2016 12:38 PM
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DeepBreathing Offline
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Moderators

Posts: 2,294
Joined: Sep 2013

Machine: Resmed S9 VPAP Adapt
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Resmed H5i
CPAP Pressure: EPAP: 9 - 15 PS: 3 - 10
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Perth, Western Australia

Post: #8
RE: Sleepyhead - Pressure vs Mask Pressure Graphs
I don't know about the AutoSet but on the ASV machine (VPAP Adapt) the mask pressure is a high resolution data stream while the regular pressure is low resolution. You can see how the mask pressure jumps up and down in response to any disturbance in the airflow on a breath by breath basis. Because of the difference in resolution the regular pressure chart will give you the pressure averaged over a second or so, while the mask pressure goes into split seconds and is likely more accurate at any particular instant.

DeepBreathing
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www.ApneaBoard.com


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03-07-2016 03:04 AM
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