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PR Pressure Hunt and Peck
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wishicansleep Offline

Preferred Members

Posts: 39
Joined: Sep 2015

Machine: Respironics System 1
Mask Type: Nasal pillows
Mask Make & Model: philips respironics Nuance Pro Pillows
Humidifier: Respironics
CPAP Pressure: 7
CPAP Software: SleepyHead

Other Comments: Begin CPAP 1 Sep 2015

Sex: Male
Location: Sydney

Post: #1
Exclaimation PR Pressure Hunt and Peck
I have a PR System One RemStar Auto with A-Flex (560PBT) with APAP (Variable) and Min 7 Max 10 (cmH2O) (Sleepyhead tells me). The Sleep tech (Resmed) was surprised by the pressure profile which shows pressure "hunting and pecking" from my machine - that he is not used to seeing on the resmed machines. Is my pressure profile "normal" for a PR machine? The PR seems to go searching for a higher pressure when there are no events and even the pressure is declining whilst it detects events.


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02-03-2016 01:07 AM
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Sleeprider Online
Wiki Editor
Advisory Members

Posts: 3,398
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: PR Pressure Hunt and Peck
The Respironics PRS1 Auto is programmed to evaluate pressure increases of 2 cmH2O at regular intervals. If it does not find an improvement, it drops the pressure back to minimum or until it detects flow limitation or snores. Your chart is absolutely typical for that machine, even in CPAP mode. The higher pressure at about 01:45 was due to flow limitations. Overall, it looks like you're dialed in pretty well.

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02-03-2016 11:52 AM
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SideSleeper Offline

Advisory Members

Posts: 227
Joined: Oct 2015

Machine: PR DS560HS REMstar Auto-A Flex+ +
Mask Type: Nasal mask
Mask Make & Model: Wisp & Dreamwear
Humidifier: Respironics System One
CPAP Pressure: APAP 11-11
CPAP Software: SleepyHead

Other Comments:

Sex: Female
Location: Western Oregon, USA

Post: #3
RE: PR Pressure Hunt and Peck
Good info--my PR560 does the same thing and I did read something about the pulse, but couldn't find it when I had questions. Thanks for the question and the answer!
02-03-2016 05:08 PM
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wishicansleep Offline

Preferred Members

Posts: 39
Joined: Sep 2015

Machine: Respironics System 1
Mask Type: Nasal pillows
Mask Make & Model: philips respironics Nuance Pro Pillows
Humidifier: Respironics
CPAP Pressure: 7
CPAP Software: SleepyHead

Other Comments: Begin CPAP 1 Sep 2015

Sex: Male
Location: Sydney

Post: #4
RE: PR Pressure Hunt and Peck
Thanks for the info Sleeprider. At least my Sleeptech will sleep well knowing this. As for me ....
02-03-2016 06:08 PM
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SideSleeper Offline

Advisory Members

Posts: 227
Joined: Oct 2015

Machine: PR DS560HS REMstar Auto-A Flex+ +
Mask Type: Nasal mask
Mask Make & Model: Wisp & Dreamwear
Humidifier: Respironics System One
CPAP Pressure: APAP 11-11
CPAP Software: SleepyHead

Other Comments:

Sex: Female
Location: Western Oregon, USA

Post: #5
RE: PR Pressure Hunt and Peck
I'm happy my machine is taking care of me! I'm running higher pressures than you are and have never been bothered by the pulses---on bad night sometimes as many as 15 or more.
02-03-2016 06:39 PM
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OpalRose Offline

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Posts: 3,181
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: #6
RE: PR Pressure Hunt and Peck
SideSleeper, that is how I look at it too. The APAP is doing its job and is constantly searching and ready. I personally don't notice these pressure changes, doesn't seem to wake me up.
If you look at the pressure graph in sleepyhead, it moves up and down 1.5cm.

OpalRose
02-03-2016 06:51 PM
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wishicansleep Offline

Preferred Members

Posts: 39
Joined: Sep 2015

Machine: Respironics System 1
Mask Type: Nasal pillows
Mask Make & Model: philips respironics Nuance Pro Pillows
Humidifier: Respironics
CPAP Pressure: 7
CPAP Software: SleepyHead

Other Comments: Begin CPAP 1 Sep 2015

Sex: Male
Location: Sydney

Post: #7
RE: PR Pressure Hunt and Peck
Dear OpalRose / Sidesleeper - my Sleeptech thinks that it is the pressure fluctuations that is affecting me - maybe more noticeable at I am at a lower pressure. I will be trying 7 - 7.5 (lo-hi) tonight and see how that goes.
02-03-2016 07:16 PM
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rhodesengr Offline

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Posts: 24
Joined: Jan 2016

Machine: PR 560
Mask Type: Nasal pillows
Mask Make & Model: P10
Humidifier: PR DS6HFLG
CPAP Pressure: 6-20
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: NorCal

Post: #8
RE: PR Pressure Hunt and Peck
My PR 560 also does this. I asked about it elsewhere and was told this is normal for the PR machines. Some describe this as the machine poking you with more pressure. Since not all machines work this way, it is interesting to speculate if this poking is better than non-poking. I have seen events in my data where the machine does nothing while at other times it will do one of these pulses where there was no event. Hopefully the folks that designed it know what they are doing but I have not figured out yet what causes the PR 560 to increase pressure "for cause"
02-03-2016 11:25 PM
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Sleeprider Online
Wiki Editor
Advisory Members

Posts: 3,398
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: #9
RE: PR Pressure Hunt and Peck
The pressure fluctuations are built into the algorithm for this machine. For most people it is not disruptive. It can improve therapy in people who do not have the usual flow limitations or snores preceding events, as the machine "tests" a higher pressure, then returns if volume improvements are not recorded. Again, the pressure changes occur over several minutes, and are very gradual. It is not a pulse.

Resmed Autoset machines do not exhibit this fluctuation, but change pressures faster.

______________________________________________
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02-04-2016 11:29 AM
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