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[Equipment] A Cast of machine running wild?
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racprops Offline

Preferred Members-2

Posts: 260
Joined: Mar 2013

Machine: Respironics DS960HS
Mask Type: Full face mask
Mask Make & Model: Respironics FitLife FFM
Humidifier: Respironics
CPAP Pressure: ????
CPAP Software: SleepyHead EncoreBasic

Other Comments:

Sex: Male
Location: Phoenix AZ

Post: #1
A Cast of machine running wild?
OK Here is another case of the machine running wild, like it has a mind of its own..

I can see NO reason for the base pressure changes, nor the high pressure it started doing at the end of this sleep cycle and it woke me up.

[Image: MOIO78_zpse6c29038.jpg]

Rich
07-09-2013 01:54 AM
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archangle Offline
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Advisory Members

Posts: 3,159
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

Other Comments: Happy PAPper

Sex: Undisclosed
Location: USA

Post: #2
RE: A Cast of machine running wild?
The machine looks at a lot more than just whether you have an apnea event or not. It's not quite clear what it looks at, but it probably looks at the "squareness" of the airflow waveform, respiration rate, tidal volume, etc. It apparently looks at some partial snoring and flow limitations that don't show up as events.

The exact details are probably company secrets.

Some of the newer APAP machines are pretty good at adjusting the pressure upwards before you actually experience an apnea. I think they look for changes in the airflow waveform shape.

The ASV machines may also decide to pump up the pressure instantly to stop a central apnea in progress. If it succeeds, it may not record a CA in the log.

If you look at the airflow and pressure waveforms at the points where it increased pressure, you may find some disturbed breathing.

Or it may just be running away.

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
07-09-2013 06:26 PM
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RonWessels Offline

Preferred Members-2

Posts: 465
Joined: Jun 2013

Machine: REMstar Auto AFlex DS560TS
Mask Type: Nasal mask
Mask Make & Model: ComfortGel Blue
Humidifier: REMstar Heated Tube DS6T
CPAP Pressure: 11 - 20
CPAP Software: SleepyHead

Other Comments: CMS50F Pulse Oximeter

Sex: Male
Location: Ontario, Canada

Post: #3
RE: A Cast of machine running wild?
There is a bit of information on the ResMed site for their AutoSet machine here. Open up the answer to "How do AutoSet devices know to adjust pressure?".
07-09-2013 06:43 PM
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spdklls99 Offline

Preferred Members-2

Posts: 71
Joined: Jun 2013

Machine: Respironics System One BIPAP Auto SV Advanced DS950
Mask Type: Full face mask
Mask Make & Model: comfortgel full
Humidifier: PR S1 Heated
CPAP Pressure: epap 10-15,psmin 3, bpm Auto
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Eastern TN

Post: #4
RE: A Cast of machine running wild?
(07-09-2013 06:43 PM)RonWessels Wrote:  There is a bit of information on the ResMed site for their AutoSet machine here. Open up the answer to "How do AutoSet devices know to adjust pressure?".

he doesnt have a resmed autoset machine but maybe it will help "learn" him something about auto pressures on devices?


and that doesnt look like a machine gone wild to me..looks like your autosv automatically ramped up the pressure to where it sensed it needed to be,,which is what is is exactlysupposed to do and why you bought it.

your ahi ca,oa, hyp are all still looking good.....your graph doesnt look so much diffeent from mine every night I have used it so far and we have the same machine

I don't believe anything I hear and only half of what I see
(This post was last modified: 07-10-2013 09:00 PM by spdklls99.)
07-10-2013 08:59 PM
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