Question on PS support

my settings are 12/17 with a PS of 1. I notice that mt EPAP and my IPAP is always 1 cm apart. My question is if I change my PS to 3 does that mean my EPAP and my IPAP will always be 3 cm apart or will my VPAP vary the ratio of the two as is needed?

Something is not right here. Are you in a fixed bipap mode and were the above settings what the doctor perscribed? If you were prescribed a EPAP of 12 and IPAP of 17 that is a PS of 5. Pressure Support is the difference between those 2 pressures. When you have PS set at 1 that limits the difference to 1cm above the EPAP.

Are you using software to monitor your data? If not get Sleepyhead here. https://sleep.tnet.com/resources/sleepyhead Then post a screenshot so we can help you. This link will help you with organize your graphs, take a screenshot, then post using Imgur. https://sleep.tnet.com/resources/sleepyhead/shorganize There are 3 pages so be sure and click on the link at the bottom of the page to continue.

If my memory is correct (and some other member more versed in how ResMed machines work is invited to clarify/correct), Resmed machines use the PS parameter to determine the difference between IPAP and EPAP while the machine varies across the prescribed range, while Respironics machines allow the IPAP and EPAP to vary independently but not getting closer than the PS number.

So, on a machine with settings of 17/12 and a PS of 1
Resmed could look like 13/12 or 14/13 or ... 17/16
Respironics could look like 13/12 or 14/12 or ... 16/15 ... up to 17/12 or 17/16,
IPAP varies from 13 to 17 and EPAP varies from 12 to current IPAP-1

At least that is what I think I remember from quite a few years ago. Whether this applies to the new models, I don't know.

JDS I do think you are right if the machine is in the Vauto mode but if in the fixed mode it would be the way I was thinking. I'm wondering why a bilevel would be limited to a 1cm P.S.?

lilly747 wrote:my settings are 12/17 with a PS of 1. I notice that mt EPAP and my IPAP is always 1 cm apart. My question is if I change my PS to 3 does that mean my EPAP and my IPAP will always be 3 cm apart or will my VPAP vary the ratio of the two as is needed?

the PS IS the difference between epap and ipap.

the resmeds have a set PS, and will be whatever you want it to be.

Thank you all for responding. I thought it moved in a fixed manner, but I wanted to make sure before I made any changes.

OkyDoky; I had a sleep study and was left bleeding: with an Escape set at 10, AHI of 19 with apnea's 0f 90 sec & up (I found out after I got a data machine). I never did see the sleep Doc. It was Pugsy and D-Dave that saved me. I am very thankful for this board.

Had to change Encore to Escape, brain far*

JDS74 wrote:If my memory is correct (and some other member more versed in how ResMed machines work is invited to clarify/correct), Resmed machines use the PS parameter to determine the difference between IPAP and EPAP while the machine varies across the prescribed range, while Respironics machines allow the IPAP and EPAP to vary independently but not getting closer than the PS number..

you are correct, resmed bilevels have a fixed PS with varying epap (and thus lockstep varying ipap.)

resprionics bilevels have a min and max setting on PS, along with the varying EPAP.

lilly747 wrote:Thank you all for responding. I thought it moved in a fixed manner, but I wanted to make sure before I made any changes.

OkyDoky; I had a sleep study and was left bleeding: with an Encore set at 10, AHI of 19 with apnea's 0f 90 sec & up (I found out after I got a data machine). I never did see the sleep Doc. It was Pugsly and D-Dave that saved me. I am very thankful for this board.

up to a point, the PS is pretty much for comfort, (it's pretty much the same as EPR on a resmed autoset/elite, except that EPR is limited to a max of 3).

if you want to change it, feel free, but I'd be careful going above 5, (watching your data being more observant of how you feel, etc).