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Do these pressure changes make sense?
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Dawei Offline

Preferred Members-2

Posts: 342
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Other
Mask Make & Model: Respironics "FitLife"
Humidifier: H5i
CPAP Pressure: 10-20
CPAP Software: ResScan SleepyHead

Other Comments: Began CPAP in 2006; spent the first 6 years with a "brick"

Sex: Male
Location: Western North Carolina

Post: #1
Do these pressure changes make sense?
Do I wish I had held out to try to get a script for an S9 AutoSet instead of the Elite? You bet!
Right now, I am using an Autoset on loan from my DME (with script from the doc). He ordered the pressure range as 8-18. The first week, Mar. 7-13, the pressure readings were: Median 16.2; 95th percentile 17.9, Max. 18.
Comparing those numbers with the most recent 7-days, Mar. 16-22, the pressure numbers were: Median 13.2; 95th percentile 15.6; Max. 17.5.

While it seems reasonable that the body changes over time and thus it's possible that PAP pressure needs may also change, I'm wondering if that type of change can happen this quickly?

Do others on AutoSet see this swing in pressures over a similar period of time? If not, what do you think might be occurring in my case?

Finally, I should ask which, if any, of these three numbers is of primary importance in measuring pressure?
03-23-2012 08:27 AM
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jdireton Offline

Preferred Members-2

Posts: 149
Joined: Feb 2012

Machine: Resmed S9 Elite
Mask Type: Nasal mask
Mask Make & Model: Resmed Mirage FX
Humidifier: Resmed H5i
CPAP Pressure: 12
CPAP Software: ResScan

Other Comments: ClimateLine Hose

Sex: Male
Location: Florida

Post: #2
RE: Do these pressure changes make sense?
(03-23-2012 08:27 AM)Dawei Wrote:  He ordered the pressure range as 8-18.
Mar. 7-13 Median 16.2; 95th percentile 17.9, Max. 18.
Mar. 16-22 Median 13.2; 95th percentile 15.6; Max. 17.5.

This is the same as the leakage I already replied to. The big change here is that, for Mar. 7-13, you were at the maximum setpoint for your machine. This skews the statistical value of the numbers, you'll never get any higher because that's all the machine will give.

That said, your second week numbers didn't hit the maximum. Sounds like you use Rescan, so I'd just keep monitoring it. If your maximum hits 18 frequently, it likely time to speak with your doctor about raising it.
03-23-2012 09:25 AM
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CHanlon Offline

Advisory Members

Posts: 292
Joined: Mar 2012

Machine: ResMed S9 Autoset
Mask Type: Nasal mask
Mask Make & Model: ResMed Activa LT
Humidifier: ResMed Hi5
CPAP Pressure: 12 -20
CPAP Software: ResScan SleepyHead

Other Comments: Mirage Activa LT nasal mask

Sex: Male
Location: Ontario, Canada

Post: #3
RE: Do these pressure changes make sense?
My numbers (on the same machine) vary like that from night to niight, and I've got nearly 2 years of data to look at. I'm set a bit higher then you - 12 to 20.
03-23-2012 10:15 PM
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Netskier Offline

Members

Posts: 125
Joined: Mar 2012

Machine: Resmed S9 Autoset, Mirage Quattro Full-Face Mask, Slimline tube.
Mask Type: Full face mask
Mask Make & Model:
Humidifier: H5i, but not being used.
CPAP Pressure: 6-13 cm H20; Ramp OFF.
CPAP Software: SleepyHead

Other Comments: Currently studying Reversal of Aging.

Sex: Male
Location: Los Angeles South Bay, about 20 min South of Downtown LA.

Post: #4
RE: Do these pressure changes make sense?
(03-23-2012 08:27 AM)Dawei Wrote:  Do I wish I had held out to try to get a script for an S9 AutoSet instead of the Elite? You bet!
Right now, I am using an Autoset on loan from my DME (with script from the doc). He ordered the pressure range as 8-18. The first week, Mar. 7-13, the pressure readings were: Median 16.2; 95th percentile 17.9, Max. 18.
Comparing those numbers with the most recent 7-days, Mar. 16-22, the pressure numbers were: Median 13.2; 95th percentile 15.6; Max. 17.5.

While it seems reasonable that the body changes over time and thus it's possible that PAP pressure needs may also change, I'm wondering if that type of change can happen this quickly?

Do others on AutoSet see this swing in pressures over a similar period of time? If not, what do you think might be occurring in my case?

Finally, I should ask which, if any, of these three numbers is of primary importance in measuring pressure?

I think that is the wrong question. The purpose of PAP is to reduce obstructive apneas and hypopneas, so I suggest running Sleepyhead and looking at those two, plus your leakage, and trying to first minimize the obstructive apneas, and secondarily to minimize the hypopneas. I did this with only cursory attention to the leakage numbers.

I found that if my mask did not leak while I was awake sitting on the side of the bed during a maskfit test (a Resmed test mode), that all of my leakage values were low in the morning on Sleepyhead. I did have to use a bandaid to keep the mask from cutting the bridge of my nose.

This got the OSA low and the hypopneas too, and then I began reducing the mask tension to get more comfort.

My age is none of my mind's business. --- Netskier
03-25-2012 12:34 AM
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