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Interpreting 20 minute periods of low pressure shown in SleepyHead
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tfield98 Offline

Members

Posts: 8
Joined: Jan 2016

Machine: AirSense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirSense 10 AutoSet
Humidifier: Built-in
CPAP Pressure: 4-7.4
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Seattle, WA USA

Post: #1
Interpreting 20 minute periods of low pressure shown in SleepyHead
I'm one of the lucky ones. Moderate (AHI 15) before my Resmed.

Now, two months using CPAP, my AHI is considerably below 1, usually about .2

Question: For fun I'm looking at my data in SleepyHead. In the attached image, there are several 20 minute periods when my mask pressure drops significantly.

I'm assuming these are part of the normal sleep cycle. Is that right? Are they REM sleep or something?

What about the pressure drop during the two RERAs? Related somehow?

Are there other patterns in Sleepyhead data (either pressure or other parameters) that make for interesting reading for someone with a general interest in the field?

For example, I can see how fast I fall asleep. And I can see that my sleep breathing is shallower and faster than my waking breathing.

But, what else might be fun to spot?

Tom

   
02-25-2016 10:42 PM
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Sleeprider Offline
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Posts: 3,317
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

Other Comments:

Sex: Male
Location: Where they make Respironics

Post: #2
RE: Interpreting 20 minute periods of low pressure shown in SleepyHead
The mask pressure drops correlate perfectly with machine pressure drops. If you want constant, just increase the minimum pressure. It appears you're using a relatively low maximum pressure in combination with an EPR of 3 which effectively gives you a pressure of 4/7 (EPEP/IPAP) when your machine is at its maximum pressure of 7.4. that is most of the night, and it works well. But when the machine pressure drops to 6, the mask pressure follows, and in once case you had a hypopnea.

This is really simple. Set your machine to fixed pressure at 7.4 with your EPR at 3, and those dips will go away. There is no reason to use APAP at that low pressure anyway.

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Robysue's Beginner's Guide to Sleepyhead
02-25-2016 11:05 PM
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tfield98 Offline

Members

Posts: 8
Joined: Jan 2016

Machine: AirSense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirSense 10 AutoSet
Humidifier: Built-in
CPAP Pressure: 4-7.4
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Seattle, WA USA

Post: #3
RE: Interpreting 20 minute periods of low pressure shown in SleepyHead
(02-25-2016 11:05 PM)Sleeprider Wrote:  The mask pressure drops correlate perfectly with machine pressure drops. If you want constant, just increase the minimum pressure. It appears you're using a relatively low maximum pressure in combination with an EPR of 3 which effectively gives you a pressure of 4/7 (EPEP/IPAP) when your machine is at its maximum pressure of 7.4. that is most of the night, and it works well. But when the machine pressure drops to 6, the mask pressure follows, and in once case you had a hypopnea.

This is really simple. Set your machine to fixed pressure at 7.4 with your EPR at 3, and those dips will go away. There is no reason to use APAP at that low pressure anyway.

Hi, Sleeprider,

Thanks for the feedback.

I guess I was mistaken. I figured that the decrease in pressure must have been from my entering a different sleep state and the machine detecting that the pressure it provided could be decreased.

I'm rather new at this. And, I suppose this has been a topic of discussion here. But, I don't feel qualified to decide what adjustments to make to my CPAP machine. I'm sure you have a lot of experience, but the changes you suggest I'll discuss with my MD.

I'm happy with just a few events a night.

Thanks again.
(This post was last modified: 02-26-2016 09:36 AM by tfield98.)
02-26-2016 09:27 AM
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Sleeprider Offline
Wiki Editor
Advisory Members

Posts: 3,317
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

Other Comments:

Sex: Male
Location: Where they make Respironics

Post: #4
RE: Interpreting 20 minute periods of low pressure shown in SleepyHead
No problem. Your treatment is excellent, and I don't see any reason to make any changes. Just remember when you are in Auto mode, the pressure may float between the minimum and maximum CPAP pressure settings. This will be reflected in the mask pressure. What strikes me, is that your machine is holding steady at your maximum set pressure. Normally, we would suggest a higher maximum pressure because the machine is apparently responding to something in its algorithm that suggests you need higher pressure than the maximum pressure setting allows; however with nearly zero events, it's not very compelling to make any changes. As long as you feel good and are benefiting from the therapy all is good. Don't hesitate to ask any other questions you might have.

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Organize your SleepyHead Data
Post your SleepyHead Data from Imgur
Robysue's Beginner's Guide to Sleepyhead
02-26-2016 10:36 AM
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trish6hundred Offline

Advisory Members

Posts: 6,430
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: #5
RE: Interpreting 20 minute periods of low pressure shown in SleepyHead
Hi tfield98,
WELCOME! to the forum.!
Much success to you with your CPAP therapy.

trish6hundred
02-26-2016 11:26 AM
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tfield98 Offline

Members

Posts: 8
Joined: Jan 2016

Machine: AirSense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirSense 10 AutoSet
Humidifier: Built-in
CPAP Pressure: 4-7.4
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Seattle, WA USA

Post: #6
RE: Interpreting 20 minute periods of low pressure shown in SleepyHead
(02-26-2016 10:36 AM)Sleeprider Wrote:  ...because the machine is apparently responding to something in its algorithm that suggests you need higher pressure than the maximum pressure setting allows;

Interesting. In fact, after a few weeks of use, I was having some problems with nasal mask leaks so my MD lowered the maximum pressure from 8 to 7.4. Seems like a miniscule change numerically. That may explain it.

I'll ask him about it next time we talk.

Thanks again.

And to anyone struggling with their new CPAP machine, "hang in there!" In addition to all the helpful advice you get here, for some of us (including me) it just takes time for our bodies to get accustomed to a new regimen like this. But, the body and mind are remarkably flexible. So, give it time! :-)

Tom
02-26-2016 12:08 PM
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