ResMed S8 Elite LCD Display Question

This may end up being a silly question - but I'm going to ask anyway. The DME guy told me my prescription called for a pressure of 9 (Is that titration?). When I view the efficacy data on the LCD each day, the "pressure" reading has always been between 7.6 and 7.8

My questions are:
Why the difference between what my machine was set at and the reading from the LCD in the Efficacy data submenu?
Does the difference matter? Am I trying to compare apples and oranges?
What exactly is this pressure reading from the efficacy menu telling me? Is it a nightly average?

Not sure if any of this would effect the answer to any of the above, but:
I have a ramp time of 15 minutes
The leak rate on my mask is generally reported at < .3
I don't turn the machine on until I'm ready to fall asleep
As far as I know, EPR is off

My understanding is that the pressure shown on our LCD screen is the 95th percentile of pressure that night, i.e. 95% of the night was spent AT or BELOW that pressure. Ramp and EPR both affect that 95th percentile. However, you can call or e-mail Resmed and ask that question and I'm sure they'll answer you. Its only the software they don't provide support for patients.

My bet would be that EPR is turned on even though you thought it was not. The lower pressures during exhalation that EPR uses would average out that way, I believe.

If that's not why you're getting that kind of pressure results, I dunno.

If it were me... I'd walk through the clinical menu and write down what all the settings are. I'd want to see them for myself. I'd hold down the right arrow button and the down arrow button together until I saw the words "Clinical Menu Welcome" appear and disappear and finally saw just the words "Clinical Setup" on the left, and "Exit" on the right.

To go through the menu, I'd press the lefthand button under "Clinical Setup", and I'd press it again under the word "Settings."

From that point on, I'd use only the down-arrow button to see each menu item. I'd write down every word, every number, every symbol I saw for each item.

The last three items in the menu are about EPR. Takes about 9 hits of the down-arrow button to get from the beginning of the menu to the first mention of "EPR."

When I was finished going through the menu, I'd hit the righthand button under the word EXIT 4 times to be sure I was completely out of the Clinical Menu.

Not a silly question at all ... a cool brain teaser actually (goes well with your avatar

Yes, generally, your titration pressure is your Rx pressure (uless the DME set your machine up wrong --- it does happen ). Your leak rate is not to bad yet it could be contributing slightly to the lower LED readings ... Slinky is right BTW about 95 percentile.

Since your machine is CPAP (as in constant pressure), your LED reading should be pretty close to your set pressure of 9 cm ... and it is not

Therefore, the EPR is most likely set to 2 or 3 which would then explain the difference. I know you can check the EPR setting within the clinician menu if you know the sleep majic ... It's been a long while since I used an S8 now and I have forgot the secret spell -- but someone on the forum can PM you if you ask nicely

Best of luck!

Dang RG! You must have hit the submit button just before I hit the reply button

Uhh ... what RG said

OK, I followed the advice (kinda/sorta) from RG and DreamStalker and set about to find the clinical data menu. I started pressing the left button and the down arrow - much to my surprise the house next door exploded. Down arrow and right button brought up the clinical menu.

My EPR is indeed turned on and set to 3 - which may very well explain why my pressure reading from the LCD doesn't match the prescribed setting of 9 (which I veriied as long as I was in that menu).

Thanks all for helping clear this up for me.