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Why are my med and 95 percents higher with narrower range?
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TheManseHen Offline

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Posts: 243
Joined: Jan 2015

Machine: RedMed A10 Airsense 10 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: One that came with machine
CPAP Pressure: 7.6-14.0 EPR 3
CPAP Software: ResScan SleepyHead

Other Comments: Started C-pap Boxing Day 2014. Tortured sleep more or less since 2000. Trigeminal Neuralgia.

Sex: Female
Location: San Francisco

Post: #1
Why are my med and 95 percents higher with narrower range?
Hi Y'all,
This may be obvious to others but I haven't puzzled this out yet.
Looking over the last 45 or so days, I note that my median and 95 percent pressures are slightly higher as time has gone on. That may be a coincidence or that may be due to the narrow range perhaps?

They were somewhat lower avg in the 5-20 pressure range, than at the 7-14 range. Anyone know why this might be?

Also had good trend going with 3 or 4 days of AHI under 5.0 and then since new pillows on mask (prob coincidence) higher again. Still feel pretty good. Still less night loo trips (though far from gone) Just in case it was the new pillows, I swapped them back to the old one's two hours into night to see if it made a diff, noting that at the swap time I was having 9.9 events per hour.

I do have to say I like the nose pillows a bit broken in. Am I alone in this?

Sunshiney day here in S.F
Hope you all are having good days and better nights.
Susan
The Manse Hen
02-11-2015 05:12 PM
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AshSF Online

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Posts: 356
Joined: Oct 2014

Machine: PRS1 D560TS
Mask Type: Nasal pillows
Mask Make & Model: ResMed P10, Bkup: Airfit F10 & Quattro Air
Humidifier: PRS1 60 series with Heated Tube
CPAP Pressure: 8 - 8 w/ Aflex 3
CPAP Software: SleepyHead

Other Comments: Using APAP mode with fixed pressure

Sex: Male
Location:

Post: #2
RE: Why are my med and 95 percents higher with narrower range?
Median pressure going up can be explained by general mathematical rules of statistics. Median is the value that is in the center of the sampled data. If you are going to move up the lower bound of the sample, the center will likely shift up.

95% pressure going up can not be explained by math alone. Since you are changing masks during this process, that may effect it.

In my experience of titrating from 4-20 to 7.5-15, I have seen my 95% pressure to be in similar range for the same mask. It did drop appreciably once I went to Nasal Pillows (P10) from a FFM (F10), from 10-11 to less than 9.0.

Started APAP 4-20, Closed range to 7.5-14, then straight 8.0 w/ Aflex 3
RDI always below 1. But sleep much much better at straight pressure.
Started on F10, Tried Quattro Air successfully. Finally settled on P10.
02-11-2015 05:53 PM
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PaytonA Offline
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Posts: 3,012
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: Why are my med and 95 percents higher with narrower range?
The higher average pressures are most probably due to the increase in your minimum pressure. The machine is able to reach an effective pressure more quickly when you give it a head start. It will also be constrained from dropping as far as it may have been with the lower min pressure. So, yes, the average pressures may be somewhat higher than when the min. pressure was lower. It "should" also help your AHI.

Best Regards,

PaytonA
02-11-2015 05:59 PM
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Sleeprider Online
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Posts: 3,353
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: Why are my med and 95 percents higher with narrower range?
And PeytonA gets the right answer! The median value is actually the most frequently occurring pressure, not the middle value (mean).

When you increased the minimum pressure, you intercepted some apnea, but also, with the machine starting at a higher pressure, the snores and flow limitations that are the basis for increasing auto pressure, caused a higher median and 95% pressure to be scored.

Your other questions might be better answered if you posted some data. Sounds like treated AHI is still relatively high.

______________________________________________
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02-11-2015 06:07 PM
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OpalRose Offline

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Posts: 3,178
Joined: Nov 2014

Machine: PR System One REMstar Auto 560 with A Flex
Mask Type: Nasal pillows
Mask Make & Model: AirFit P10 For Her
Humidifier: REMStar heated humidifier with heated hose
CPAP Pressure: Auto Cpap 10-13 AFLEX 1
CPAP Software: SleepyHead EncoreBasic

Other Comments: Started CPAP Therapy October 23, 2014

Sex: Female
Location: Northeast Ohio, USA

Post: #5
RE: Why are my med and 95 percents higher with narrower range?
(02-11-2015 05:12 PM)TheManseHen Wrote:  Hi Y'all,
This may be obvious to others but I haven't puzzled this out yet.
Looking over the last 45 or so days, I note that my median and 95 percent pressures are slightly higher as time has gone on. That may be a coincidence or that may be due to the narrow range perhaps?

They were somewhat lower avg in the 5-20 pressure range, than at the 7-14 range. Anyone know why this might be?

Also had good trend going with 3 or 4 days of AHI under 5.0 and then since new pillows on mask (prob coincidence) higher again. Still feel pretty good. Still less night loo trips (though far from gone) Just in case it was the new pillows, I swapped them back to the old one's two hours into night to see if it made a diff, noting that at the swap time I was having 9.9 events per hour.

I do have to say I like the nose pillows a bit broken in. Am I alone in this?

Sunshiney day here in S.F
Hope you all are having good days and better nights.
Susan
The Manse Hen

Hi Susan from Sunshiny S.F. .....wish you could send me some sun here in snowy Ohio! I have to take vitamin D instead!
When I started to change my pressure numbers from 4 to 20 to my current 8 to 14,
I also noticed the 90% range went up too. It means the machine is reaching the pressure that it needs to clear an apnea faster., and stays at that number because it needs to. When you have your pressure set at the correct range for you, it allows the machine to do its job more efficiently by not taking forever to reach the pressure needed, which in turn you AHI numbers should drop. Just give it some time.
Now with the pillows...I find I have to change them often...like every 20 days! They get too soft, cause my nose to itch, and I notice more leaks. Also, if I try to use a worn out one, my AHI goes up. I know that everyone is different.

OpalRose
02-11-2015 06:21 PM
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eseedhouse Offline

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Posts: 881
Joined: Dec 2014

Machine: ResMed Airsense 10 Autoset
Mask Type: Full face mask
Mask Make & Model: SimPlus
Humidifier: ResMed
CPAP Pressure: 7-10
CPAP Software: SleepyHead

Other Comments: Also on supplemental O2 at 3L/min. while sleeping.

Sex: Male
Location: Victoria, British Columbia

Post: #6
RE: Why are my med and 95 percents higher with narrower range?
(02-11-2015 06:07 PM)Sleeprider Wrote:  The median value is actually the most frequently occurring pressure, not the middle value (mean).

No, I'm sorry, you are wrong. The "mode" is the most frequently occurring value, the "median" is the middle value, and the "mean" is the common "average" obtained by adding up all the data points and dividing that sum by the number of data points.

I looked it up on google just to be sure.

Ed Seedhouse
VA7SDH

I am neither a Doctor, nor any other kind of medical professional.

Actually you know, it is what it isn't.
02-11-2015 07:32 PM
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Sleeprider Online
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Advisory Members

Posts: 3,353
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: #7
RE: Why are my med and 95 percents higher with narrower range?
Brain fart! That's what I'm stickin' with. Smile

______________________________________________
Organize your SleepyHead Data
Post your SleepyHead Data from Imgur
Robysue's Beginner's Guide to Sleepyhead
02-11-2015 08:56 PM
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quiescence at last Offline

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Posts: 753
Joined: Nov 2014

Machine: REMstar System One with Autoflex
Mask Type: Full face mask
Mask Make & Model: Quattro AirFit F10
Humidifier: yes typical setting = 4
CPAP Pressure: 5-13 Autotritrating CPAP
CPAP Software: SleepyHead EncoreBasic

Other Comments: CMS-50F Plus oximeter /w SPO2 Assistant software. Avowed mouth-breather switching to nose-breathing

Sex: Male
Location: US

Post: #8
RE: Why are my med and 95 percents higher with narrower range?
so the median is likely to go up because the mode is forced to a higher value. this likely means OSA related events and occurrences are reduced. this may also result in higher CAs and so net increase in AHI may occur possibly creating a new maximum.
Coffee
02-11-2015 09:58 PM
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eseedhouse Offline

Advisory Members

Posts: 881
Joined: Dec 2014

Machine: ResMed Airsense 10 Autoset
Mask Type: Full face mask
Mask Make & Model: SimPlus
Humidifier: ResMed
CPAP Pressure: 7-10
CPAP Software: SleepyHead

Other Comments: Also on supplemental O2 at 3L/min. while sleeping.

Sex: Male
Location: Victoria, British Columbia

Post: #9
RE: Why are my med and 95 percents higher with narrower range?
(02-11-2015 09:58 PM)quiescence at last Wrote:  so the median is likely to go up because the mode is forced to a higher value.

Well no. If you increase the top pressure while the bottom remains the same the median (middle value) will go up regardless of what happens to the mode. The mode could be very low so long as it is the most frequent value.

Ed Seedhouse
VA7SDH

I am neither a Doctor, nor any other kind of medical professional.

Actually you know, it is what it isn't.
02-11-2015 10:40 PM
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PaytonA Offline
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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: #10
RE: Why are my med and 95 percents higher with narrower range?
(02-11-2015 10:40 PM)eseedhouse Wrote:  
(02-11-2015 09:58 PM)quiescence at last Wrote:  so the median is likely to go up because the mode is forced to a higher value.

Well no. If you increase the top pressure while the bottom remains the same the median (middle value) will go up regardless of what happens to the mode. The mode could be very low so long as it is the most frequent value.

Except we are talking about the max pressure setting going down and the min pressure setting going up. The reduction of the max pressure setting has no effect on the statistics at its current level. The min. pressure setting, however, does have an effect.

Best Regards,

PaytonA
02-12-2015 12:32 AM
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