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[CPAP] BiPAP Machine Won't Switch to Inhale
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bethelight Offline

New Members

Posts: 2
Joined: Jul 2013

Machine: Respironics BiPAP Auto M Series
Mask Type: Full face mask
Mask Make & Model: FlexiFit431
Humidifier: built in
CPAP Pressure: auto: 6-20
CPAP Software: Not using software

Other Comments:

Sex: Female
Location:

Post: #1
BiPAP Machine Won't Switch to Inhale
Hi there, everyone.

I recently purchased a used Respironics BiPAP Auto M Series machine on Craigslist. It's my first bipap machine, and I'm having some trouble with it. I've been doing a lot of reading here and other places via Google to learn things about the machine, so I know how to get in to change settings, etc., but I still have a lot to learn.

The problem I'm having is that, no matter how I adjust the settings (biflex, rise, etc.), the machine almost always stays on the exhale pressure. Rarely, if I take a big breath with all my might, I can get it to switch to the inhale pressure, but then, if I try again, it usually doesn't work. I am a bit of a shallow breather, and I know the previous owner was a big guy, and probably had much bigger lung capacity than I do, so I don't know if that could be the issue. If it might be, is there a way to reset the breathing pattern / air displacement, so the machine would learn mine?

The bottom line is, I just don't know enough about bipap machines to know how to troubleshoot this problem. I've been googling around for answers for more than a week to no avail. I would deeply appreciate any help or information you guys might have.

== Details ==
Machine: Respironics BiPAP Auto M Series (used)
Mask: FlexiFit431 Full Face Mask

Mode: Bilevel Auto
Max IPAP: 20.0 cmH2O
Min EPAP: 6.0 cmH2O
Max Press Sup: 8.0 cmH2O
Bi-Flex: 3

Thank you!!
07-19-2013 08:57 PM
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trish6hundred Offline

Advisory Members

Posts: 3,024
Joined: May 2012

Machine: Resmed S9 AutoSet for Her
Mask Type: Nasal pillows
Mask Make & Model: Resmed AirFit P10 For Her
Humidifier: H5i Heated Humidifier
CPAP Pressure: 10 - 7-20 Cm H2O
CPAP Software: Not using software

Other Comments: I started CPAP in 2008. Totally blind since birth.

Sex: Female
Location: Missouri, USA

Post: #2
RE: BiPAP Machine Won't Switch to Inhale
Hi bethelight,
 
WELCOME! to the forum.!
Hang in there and someone who knows the ins & outs of the BIPAP machines will help you soon.
Best of luck.

trish6hundred
07-19-2013 09:38 PM
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vsheline Offline

Advisory Members

Posts: 905
Joined: Jul 2012

Machine: S9 VPAP Adapt (USA Model# 36007, not better 36037)
Mask Type: Full face mask
Mask Make & Model: Quatro FX or F10 w/ Liner. MirageQuatro & Gecko gel pad
Humidifier: H5i
CPAP Pressure: 15 EPAP, PS 4-10, Max IPAP 25
CPAP Software: ResScan

Other Comments: Marfan Syndrome, chronic bradycardia, occasional Cheyne-Stokes Respiration

Sex: Male
Location: California, USA

Post: #3
RE: BiPAP Machine Won't Switch to Inhale
(07-19-2013 08:57 PM)bethelight Wrote:  Mode: Bilevel Auto
Max IPAP: 20.0 cmH2O
Min EPAP: 6.0 cmH2O
Max Press Sup: 8.0 cmH2O
Bi-Flex: 3

Hi bethelight, welcome to the forum!

The difference between inhale pressure and exhale pressure is called Pressure Support.

Your Max Press Sup has been set to 8. This means the machine will never automatically raise the Press Sup higher than this.

If the Press Sup is zero there will be no difference between inhale and exhale pressure (both EPAP and IPAP will be 6 when starting the machine).

If there a Minimum Press Sup setting, I suggest setting it to a comfortable starting amount, such as 1 or 2 (or whatever you are already accustomed to), and increasing it by 1 each night, until you find the amount of Minimum Press Sup you like best. I think many bi-level users prefer the minimum to be 4 or higher. (I prefer a minimum of 6, because I am prone to Central Apnea. If my Minimum Press Sup is not high enough my breathing will sometimes very gradually become ever more shallow, leading to hypopneas.)

Take care,
--- Vaughn

Advisory Members as a group provide advice and suggestions to Apnea Board administrators and staff concerning Apnea Board operation and administrative policies. Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment.
(This post was last modified: 07-20-2013 12:11 AM by vsheline.)
07-19-2013 11:58 PM
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pgw78 Offline

Preferred Members

Posts: 30
Joined: Jun 2013

Machine: ResMed S9
Mask Type: Nasal mask
Mask Make & Model: Fisher Paykel Zest
Humidifier: H5i
CPAP Pressure: 15/11
CPAP Software: ResScan

Other Comments:

Sex: Male
Location:

Post: #4
RE: BiPAP Machine Won't Switch to Inhale
I'd talk to a doctor or a respiratory therapist about this. It may be something with the machine. That said:

Do you know what your mask leak is? If the leak is too high, the machine may not be able to detect your exhalations.

How's your hose? I recently had trouble because the company sent me some very thin, cheap tubing which actually deformed just slightly in one spot. It was enough to dampen the pressure changes, keeping the machine from detecting my breathing.

Have you tried setting the machine to steady pressures? Instead of minimum and maximum, have a fixed IPAP (inhale pressure) and EPAP (exhale pressure). I don't know if that's right for you. I know I sleep better with steady pressures. But if the problem is that the machine isn't switching over to the expected EPAP, it may be worth seeing if giving it fixed numbers will make the difference.
07-20-2013 12:45 AM
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bethelight Offline

New Members

Posts: 2
Joined: Jul 2013

Machine: Respironics BiPAP Auto M Series
Mask Type: Full face mask
Mask Make & Model: FlexiFit431
Humidifier: built in
CPAP Pressure: auto: 6-20
CPAP Software: Not using software

Other Comments:

Sex: Female
Location:

Post: #5
RE: BiPAP Machine Won't Switch to Inhale
Thank you all for your responses!

vsheline, there isn't a Minimum Press Sup setting, unfortunately, but thank you for the suggestion!

pgw78, thanks! The machine is telling me the average leak is 0.7 L/min, but I only slept with this for about two hours one night (I wasn't getting enough air because the pressure was staying on the exhale minimum), and I've been messing with it, trying to get it working since then. The hose seems fine, but I'll look at it more closely in a bit.

I have tried setting it on steady Bilevel numbers instead of using Auto, but the problem remains.

Thanks again!
07-20-2013 06:46 AM
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