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Resmed S9 Autoset question
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projman65 Offline

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Posts: 21
Joined: Apr 2012

Machine: Resmed S9 Autoset
Mask Type: Full face mask
Mask Make & Model:
Humidifier: Resmed 5i
CPAP Pressure: 9-16
CPAP Software: ResScan

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Sex: Male
Location: Tampa, Florida

Post: #11
RE: Resmed S9 Autoset question
Thanks for this info Zonk. That's very good info about the algorithm of the S9 Autoset.
05-04-2012 07:48 AM
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jrrs Offline

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Posts: 1
Joined: Jul 2014

Machine: resmed S9 auto
Mask Type: Full face mask
Mask Make & Model: quattro air
Humidifier: resmed h5i
CPAP Pressure: unsure
CPAP Software: Not using software

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Sex: Male
Location:

Post: #12
RE: Resmed S9 Autoset question
(04-26-2012 02:04 PM)projman65 Wrote:  Your explanation makes sense...so I guess it doesn't really adjust the pressure breath to breath.

while the manufacturer's FAQ says that it does "adjust breath by breath", the very next item in the FAQ explains that it samples data over a 5 breath period. i find those hilariously contradictory, but whatever.

instead of: breath by breath
think of it as: breath-breath-breath-breath by breath.
07-10-2014 04:14 PM
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retired_guy Offline

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Posts: 2,744
Joined: Jan 2014

Machine: ResMed S9 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: ResMed
CPAP Pressure: 10.6/14, EPR 3
CPAP Software: ResScan SleepyHead

Other Comments: Is it bedtime yet?

Sex: Male
Location: Beautiful, albeit very wet Oregon Coast

Post: #13
RE: Resmed S9 Autoset question
Oh you better watch out,
you better not cry.

You better not pout
I'm tellin' you why....

Resmed knows if you're about to die............
07-10-2014 04:27 PM
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robysue Online
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Posts: 1,220
Joined: Oct 2013

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: #14
RE: Resmed S9 Autoset question
(07-10-2014 04:14 PM)jrrs Wrote:  
(04-26-2012 02:04 PM)projman65 Wrote:  Your explanation makes sense...so I guess it doesn't really adjust the pressure breath to breath.

while the manufacturer's FAQ says that it does "adjust breath by breath", the very next item in the FAQ explains that it samples data over a 5 breath period. i find those hilariously contradictory, but whatever.

instead of: breath by breath
think of it as: breath-breath-breath-breath by breath.
The statements are NOT contradictory.

The S9 has to compare each breath to something in order to figure out what to do next. And it compares the current breath to a running average of the last 5 breaths. (I actually think it's keeping track of more than one running average when it comes to scoring events.)

If the current breath is substantially smaller than the previous 5 breaths it starts timing how long the reduced breath size is in order to (potentially) score a hypopnea. If there's been no air movement for 5-6 seconds, it start the FOT algorithm in preparation to score an apnea if the "no air movement" lasts for a total of 10 seconds.

If the current breath looks much more ragged than the previous 5, the flow limitation curve will start to increase and if the current breath is ragged enough, the pressure will start to increase.

Back to the original question: Why didn't the S9 reduce the pressure after the OP woke up? The S9 has NO idea that you are awake and wake breathing is a lot more irregular than sleep breathing. AutoPAPs will often score Flow Limitations during wake breathing, as well as H's, CAs, and even OAs. And the S9 reacts pretty aggressively to flow limitations.

Look at the flow graph, the flow limitation graph, and the pressure graph together during the time that you know you were awake and looking at the S9's LCD. There may be a lot more raggedness than you would expect with your normal wake breathing.

And then there's also this: The S9 is very quick to increase the pressure: Under the right circumstances it will increase the pressure by as much as 1-2 cm/minute for 5-10 minutes, resulting in a 10cm rise in pressure. But the S9 reduces the pressure very, very slowly. After a 5-7 cm rise in pressure, it may take the S9 20-30 minutes to lower that pressure back down.

Questions about SleepyHead?
See my Guide to SleepyHead
07-10-2014 06:53 PM
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Sleepster Offline
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Posts: 4,988
Joined: Feb 2012

Machine: ResMed AirCurve10 VAuto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: HumidAir and SlimLine Hose
CPAP Pressure: MaxI 13.6 | MinE 5.2 | PS 4.4
CPAP Software: ResScan SleepyHead

Other Comments: Diagnosed Nov 2011. Conquered aerophagia.

Sex: Male
Location: Houston, Texas

Post: #15
RE: Resmed S9 Autoset question
(07-10-2014 04:14 PM)jrrs Wrote:  while the manufacturer's FAQ says that it does "adjust breath by breath", the very next item in the FAQ explains that it samples data over a 5 breath period. i find those hilariously contradictory, but whatever.

Yup, you have to take manufacturers' claims carefully. They may make you think they mean one thing, then you find out they meant something else. It's like they're trying to sell their product rather than describe it accurately. Too-funny

So in this case you might think that the pressure changes breath by breath. It's 7 for this breath, 10 for the next, 5 for the one after that, and so forth. But as RobySue explained, that's not what they mean.

And then you realize, well, duhh, of course!

This is the nature of the culture we live in.

Sleepster
Apnea Board Moderator
www.ApneaBoard.com


INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
07-10-2014 07:55 PM
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diamaunt Offline

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Posts: 436
Joined: May 2012

Machine: S9 VPAP Auto 36006
Mask Type: Full face mask
Mask Make & Model: mirage quattro/pilairo q
Humidifier: none
CPAP Pressure: 9-20ish
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: texas

Post: #16
RE: Resmed S9 Autoset question
yup, you have to get an ST or ASV for breath by breath adjustments.
07-10-2014 08:54 PM
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