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0.6 AHI, but mean-pressure = min pressure
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Visitor Offline

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Machine: Resmed Airsense 10 Autoset
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Other Comments: Started APAP on May 26, 2014. Benefits kicked in on May 31 thanks to forum help (leakage resolved)

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Post: #1
0.6 AHI, but mean-pressure = min pressure
Is this normal? Feeling great, but I'm puzzled that the mean pressure = min pressure. Graphs look nearly flat as a result. Should be good right? (third line counting from bottom, marked in dark blue)

[Image: 28txgro.jpg]

Before APAP: [Image: DARTH-VADER_zpsa57946df.png]

After APAP: See avatar: R2D2 for the win!

"Be kind, for everyone you meet is fighting a great battle"
--Ian Maclaren

I don't snore! I just make creepy noises so the aliens know I'm not someone to be messed with.
(This post was last modified: 06-24-2014 01:45 AM by Visitor.)
06-24-2014 01:39 AM
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robysue Offline
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Machine: PR Dreamstation BiPAP Auto
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Post: #2
RE: 0.6 AHI, but mean-pressure = min pressure
The image looks like an Excel spreadsheet of numbers. What do the acronyms in the column labels stand for?

What graph are you talking about?

And I can't figure out how or where the "mean pressure" value you are talking about is being computed.

Question: Is the mean pressure being computed from values used to draw the pressure graph? And are you sure you are looking at the mean pressure instead of the median pressure?
(This post was last modified: 06-24-2014 01:53 AM by robysue.)
06-24-2014 01:49 AM
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zonk Offline

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Post: #3
RE: 0.6 AHI, but mean-pressure = min pressure
(06-24-2014 01:49 AM)robysue Wrote:  And I can't figure out how or where the "mean pressure" value you are talking about is being computed.
I,m not sure either, Visitor posted some graphs here (see post #7):
http://www.apneaboard.com/forums/Thread-Data-how-am-I-doing
06-24-2014 03:53 AM
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Visitor Offline

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Posts: 164
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Machine: Resmed Airsense 10 Autoset
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Other Comments: Started APAP on May 26, 2014. Benefits kicked in on May 31 thanks to forum help (leakage resolved)

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Post: #4
RE: 0.6 AHI, but mean-pressure = min pressure
Thanks, I will post the other graphs and will indicate what the abbreviations stand for.

Before APAP: [Image: DARTH-VADER_zpsa57946df.png]

After APAP: See avatar: R2D2 for the win!

"Be kind, for everyone you meet is fighting a great battle"
--Ian Maclaren

I don't snore! I just make creepy noises so the aliens know I'm not someone to be messed with.
06-24-2014 07:50 AM
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retired_guy Offline

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Post: #5
RE: 0.6 AHI, but mean-pressure = min pressure
What's clear about the chart is your doing great, Visitor! Look at what the AHI has been doing (right-most column) Each day it has been dropping as you have been using the machine. You're staying nicely within your min/max range, and not making a lot of changes from one day to the next.

AHI of .06? That's great. Keep up the good work.
06-24-2014 10:38 AM
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Visitor Offline

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Posts: 164
Joined: Feb 2014

Machine: Resmed Airsense 10 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed P10 nasal pillows
Humidifier: Resmed Airsense 10 and heated hose
CPAP Pressure: 9
CPAP Software: SleepyHead

Other Comments: Started APAP on May 26, 2014. Benefits kicked in on May 31 thanks to forum help (leakage resolved)

Sex: Male
Location:

Post: #6
RE: 0.6 AHI, but mean-pressure = min pressure
Great,

P = mean pressure, L = mean leakage, index of abnormal respiration, as a percentage of total therapeutic time (ARDI).

Rest is clear (or unknown)

Also:

Recommended mask leakage: 20 to 40 litres per minute at 10 cmH2O
(min mask leakage 12 l/min at 4 cmH2O)

here are the graphs:

[Image: muvp6h.jpg]

[Image: j5b3hu.jpg]

Before APAP: [Image: DARTH-VADER_zpsa57946df.png]

After APAP: See avatar: R2D2 for the win!

"Be kind, for everyone you meet is fighting a great battle"
--Ian Maclaren

I don't snore! I just make creepy noises so the aliens know I'm not someone to be messed with.
(This post was last modified: 06-24-2014 11:23 AM by Visitor.)
06-24-2014 11:13 AM
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PsychoMike Offline

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Post: #7
RE: 0.6 AHI, but mean-pressure = min pressure
Visitor, I'm in almost the same boat.

My pressure has been tweaked a little over the last few months and my current mean pressure is only slightly higher than my current minimum pressure. In my books, it is what it is...my body likes it (AHI in the 0.15 or lower range), the mask likes it (mean leaks are practically zero) and I'm getting good sleep. Heck, my "short" nights leave me feeling better now than my long nights before treatment did. Enjoy it Smile
06-24-2014 11:21 AM
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Visitor Offline

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Posts: 164
Joined: Feb 2014

Machine: Resmed Airsense 10 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed P10 nasal pillows
Humidifier: Resmed Airsense 10 and heated hose
CPAP Pressure: 9
CPAP Software: SleepyHead

Other Comments: Started APAP on May 26, 2014. Benefits kicked in on May 31 thanks to forum help (leakage resolved)

Sex: Male
Location:

Post: #8
RE: 0.6 AHI, but mean-pressure = min pressure
Interesting PsychoMike, I'm definitely feeling good. No clue if there are central apneas (based on these graphs).

Before APAP: [Image: DARTH-VADER_zpsa57946df.png]

After APAP: See avatar: R2D2 for the win!

"Be kind, for everyone you meet is fighting a great battle"
--Ian Maclaren

I don't snore! I just make creepy noises so the aliens know I'm not someone to be messed with.
06-24-2014 11:43 AM
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robysue Offline
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Posts: 1,233
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Machine: PR Dreamstation BiPAP Auto
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: PR Dreamstation humidfier
CPAP Pressure: min EPAP = 4; max IPAP = 9;
CPAP Software: SleepyHead EncoreBasic EncorePro

Other Comments: Papping since September 2010

Sex: Female
Location: Buffalo, NY

Post: #9
RE: 0.6 AHI, but mean-pressure = min pressure
(06-24-2014 11:13 AM)Visitor Wrote:  Great,

P = mean pressure, L = mean leakage, index of abnormal respiration, as a percentage of total therapeutic time (ARDI).
What program is computing the "mean pressure" for you? And are you sure you are not misreading "median pressure" as "mean pressure"?

The graphs you post look like they are from the official software for your Breas iSleep 20i machine. The pressure data makes it clear that the median pressure for this night is indeed equal to your minimum pressure setting because the machine left the pressure at its minimum setting for at least 70-75% of the night.

And given the very minor pressure increases and how short lived they are, I would expect the (weighted) mean to be pretty close to the minimum pressure setting. And it's possible that if the mean pressure is rounded to one decimal place that it looks just like the minimum pressure setting.

For example, suppose we have 1000 data points, and 950 of those data points are equal to 6.5 and the remaining data points are all equal to 7. Then the mean of the set is:
    (950 * 6.5 + 50 * 7)/1000 = (6175 + 350)/1000 = 6525/1000 = 6.525 = 6.5 when the data is rounded to one decimal place
06-24-2014 11:49 AM
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Visitor Offline

Advisory Members

Posts: 164
Joined: Feb 2014

Machine: Resmed Airsense 10 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed P10 nasal pillows
Humidifier: Resmed Airsense 10 and heated hose
CPAP Pressure: 9
CPAP Software: SleepyHead

Other Comments: Started APAP on May 26, 2014. Benefits kicked in on May 31 thanks to forum help (leakage resolved)

Sex: Male
Location:

Post: #10
RE: 0.6 AHI, but mean-pressure = min pressure
Makes sense.

Before APAP: [Image: DARTH-VADER_zpsa57946df.png]

After APAP: See avatar: R2D2 for the win!

"Be kind, for everyone you meet is fighting a great battle"
--Ian Maclaren

I don't snore! I just make creepy noises so the aliens know I'm not someone to be messed with.
06-24-2014 01:48 PM
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