Auto bipap stuck in cpap mode for mo reason

[JenInCo]

I'm using a respironics system one bipap. It had been working great and my AHIs were low. Then I just had to mess w things. I've lost a lot of weight and thought, Maybe my maximum ipap could be lowered, bc most nights my 90% pressure doesn't go above 9. Well, my sleep got worse, so I reverted the max ipap to 20. I never touched the min epap of 4.

Ever since, when I check the data each morning, it gives me identical ipap and epap, which is like a cpap! But under the clinical menu I see that I'm still on "auto b." I'm confused and my ahi is going up

Any ideas?

[archangle]

Welcome. Please sign up for an ID and enter your equipment into your profile. There's a link in my signature line.

Your description doesn't quite sound like what I'd expect, but try removing your SD card and seeing if the changes stick. On PRS1 machines, the doctor or DME can lock down the SD card such that it resets your machine settings whenever you put the card into the machine. (Or when you turn the machine on. I forget the exact details.)

If they have locked down the SD card, you can format it on your PC or replace it with a standard SD card.

[rockymountainsleeper]

OK, I'll try that. Thanks.

(It's me, posting with my account, which for some reason I couldn't access earlier.)

[Pugsy]

Which model bipap...750 or 760?
What is pressure support set at?
Can you post an image of a typical detailed nightly graph showing pressures (and the usual basic stuff)?
What does the leak rare look like?

[robysue]

Ever since, when I check the data each morning, it gives me identical ipap and epap, which is like a cpap! But under the clinical menu I see that I'm still on "auto b." I'm confused and my ahi is going up

Where are you getting the "identical ipap and epap" numbers?

From SleepyHead's CPAP Statistics page? (There are KNOWN bugs on that page.)

From SleepyHead's Daily Data? Can you show us the pressure graph?


And what are your machine's settings as shown in the machine's clinical menu?

mode = Auto B
min EPAP = ???
max IPAP = ???
min PS = ??? (you will only have this if you have a 760 BiPAP)
max PS = ???

[rockymountainsleeper]

Thanks everyone--I will get this information.

[rockymountainsleeper]

Ever since, when I check the data each morning, it gives me identical ipap and epap, which is like a cpap! But under the clinical menu I see that I'm still on "auto b." I'm confused and my ahi is going up

Where are you getting the "identical ipap and epap" numbers? From the "info" section on my machine.

And what are your machine's settings as shown in the machine's clinical menu?

mode = Auto B
min EPAP = 4.0
max IPAP = 20.0
min PS = 0 (you will only have this if you have a 760 BiPAP)
max PS =0

[rockymountainsleeper]

Can someone point me to where I can find out how to post images?

[robysue]

Although I wrote these instructions for the ApneaBoard forum, they're pretty much the same for posting images over here as well: Back: 14. Posting SleepyHead Graphs to the Forum

[Pugsy]

Can you also please confirm machine model number please?
Look on the bottom of the blower unit for a 3 digit number and tell us.
What does it say for PS? Is it zero?


How to do Screen shot thread viewtopic.php?f=1&t=81072&p=737779#p737779

[archangle]

Welcome. Please sign up for an ID and enter your equipment into your profile. There's a link in my signature line.

Your description doesn't quite sound like what I'd expect, but try removing your SD card and seeing if the changes stick. On PRS1 machines, the doctor or DME can lock down the SD card such that it resets your machine settings whenever you put the card into the machine. (Or when you turn the machine on. I forget the exact details.)

If they have locked down the SD card, you can format it on your PC or replace it with a standard SD card.

You might want to remove both the SD card and the modem. The modem can reset your settings, too.

If it wasn't clear, do this just as a test and put them back on once you've figured out whether that's the cause of your problems.

[rockymountainsleeper]

Here's a screenshot of "before"--when things were going fine



Here's when I changed the settings, to see if I could do even better



This is after I tried to revert the settings back to the way they were before



My machine is a 760. Max ipap 20, min epap 4, max PS 0, min PS 0

I'm thinking the PS readings of 0 could be the problem.

[Pugsy]

I'm thinking the PS readings of 0 could be the problem.

Yep, that's why it is showing only one pressure and looks like cpap mode (sort of because cpap mode wouldn't have the pressure varying at all) but instead with PS of 0.
With PS of 0 in auto mode you are only getting the one starting pressure of 4.
You have to have a PS value set to get bilevel or the 2 pressures...one for inhale and one for exhale.

[rockymountainsleeper]

I'm thinking the PS readings of 0 could be the problem.

Yep, that's why it is showing only one pressure and looks like cpap mode (sort of because cpap mode wouldn't have the pressure varying at all) but instead with PS of 0.
With PS of 0 in auto mode you are only getting the one starting pressure of 4.
You have to have a PS value set to get bilevel or the 2 pressures...one for inhale and one for exhale.

Thank you!! So what numbers should the Min PS and Max PS be?

[Pugsy]

So what numbers should the Min PS and Max PS be?

I don't know exactly because there's such a wide range available and I have no way to know what suits your needs the best.
If using the bipap for comfort issues only or to help with aerophagia issues then PS of 4 is a commonly used setting.
On my bipap 760 machine...I used minimum PS of 4 and max of 5. I found it quite comfortable.
You might experiment with min of 3 or 4 and see what feels the best to you. I wouldn't set the max more than 6 though.

Side note..when you go to change the minimum pressure from 0 it won't let you change until the maximum is above 0. So set your max PS first and then set the min.