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ResMed AS 11 & SD Card lock?
#11
RE: ResMed AS 11 & SD Card lock?
We are going to talk about BiLevels vs
CPAPs to start.
Dropping all EPR you have a single pressure machine in the CPAP. BiLivels have 2 pressures, an exhale pressure and an inhale pressure. On a BiLevel the base pressure is the exhale pressure, this is what is used to manage OA events. This pressure is increased/titrated up to minimize OA events. This is the same as Pressure in a CPAP.

With OA events now managed, on a BiLevel, we increase the inhale pressure to manage hypopneas and flow limitations. Do note that while a higher exhale pressure can manage hypopneas and flow limitations, a pressure differential is more effective. This pressure differential, the difference between exhale and inhale pressures is called pressure support. It is that simple.

EPR, a comfort feature, makes ResMed CPAPS behave as a BiLevel with the EPR amount of Pressure Support applied. EPR is subtracted from Pressure on a CPAP o it takes a bit of math to match the BiLevel pressures but once there the treatment is nearly identical though limited to the values on 1,2, or 3 come of Pressure Support.

How does it work? Not much is written on that so I go back to physics. Basic pressure, EPAP, applies the main splint open the airway force. Air is moved not by raw pressure, but by differential pressure. The moderate amount of differential pressure applied via either PS or EPR overcomes the smaller resistance indicated by hypopneas or flow limitations.

The above is all fixed pressure, the auto functions respond to detected events or the lack thereof, by moving the EPAP and IPaP up and down as appropriate.
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#12
RE: ResMed AS 11 & SD Card lock?
Thank you so much, Gideon, I really appreciate your time and expertise in helping me understand BiLivels/CPAP theory and therapy.

I did make the changes you suggested.  
Set EPR=3, Fulltime
Set Min Pressure=7
Set max pressure = 10
   

The comfort level was good - a bit stronger but certainly manageable.

However, an odd thing occurred.  I was on therapy most of last night (myAir confirms 07:04 usage hours).  However, my OSCAR Session Information only indicates my usage was 02:52 (see below).  After using the washroom during the middle of the night, my AS11 had some message displayed I had not seen before, something about sending data to ResMed with an "Ok" button.  I pressed 'Ok" and then a message appeared, displaying something about by SD card data...maybe being deleted???.  I couldn't make out exactly what it was saying before the message disappeared.  Maybe I shouldn't have pressed "Okay"??  Maybe data was being sent to ResMed because I changed the settings??

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#13
RE: ResMed AS 11 & SD Card lock?
Ooops!!  I'm so sorry about that... won't happen again.  I'm still learning about how to use this forum.  Thanks.
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#14
RE: ResMed AS 11 & SD Card lock?
I don't want to hijack the thread but have something to add.  I have the same machine and when I don't move the lock on the SD card before I put it into the PC I get an error when I first put it back into the AS11.  It takes a little bit and then loads it, but it will initially say there's an SD card error.  I started locking it before I put it into the PC and I don't get the error anymore.  It didn't affect any of the data, but it can give you pause the first time.
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#15
RE: ResMed AS 11 & SD Card lock?
I also have a AS11 and I don't lock my SD card and no messages.
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#16
RE: ResMed AS 11 & SD Card lock?
It could be the difference in the computer OS being used to read the card. Unless the option is turned off, Windows will add a System Volume Information file to the drive. Linux and Mac don't.
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#17
RE: ResMed AS 11 & SD Card lock?
Hello,

I have re formatted a non ResMed 16gb SD card and I have had no difficulty downloading and extracting data all the while keeping the SD card unlocked - as was suggested to me by Gideon at the beginning of this stream.  Good luck!
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