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Why does my Pressure and Leaks go crazy
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robysue Offline
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Advisory Members

Posts: 1,247
Joined: Oct 2013

Machine: PR Dreamstation BiPAP Auto
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: PR Dreamstation humidfier
CPAP Pressure: min EPAP = 4; max IPAP = 9;
CPAP Software: SleepyHead EncoreBasic EncorePro

Other Comments: Papping since September 2010

Sex: Female
Location: Buffalo, NY

Post: #11
RE: Why does my Pressure and Leaks go crazy
(07-11-2014 03:43 PM)bwexler Wrote:  "And your PS is set to range from 1.8 to 18.3?? (That does not quite make sense to me, since it's an awfully wide PS range.)"

I agree, but I am not knowledgeable enough to know what changes would be appropriate. Any recomendations ar welcome.
tThat's above my pay scale.

Seriously, it's worth asking the sleep doc who is responsible for prescribing these settings why the max PS is so high and the min PS is so low.

But then again, these settings are working well for you most of the time. Do you often max out that IPAP = 25 with an extremely large gap between EPAP and IPAP?

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07-11-2014 06:03 PM
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igdoc Offline


Posts: 13
Joined: Feb 2014

Machine: PR S1 Bipap ASV Advanced 961
Mask Type: Full face mask
Mask Make & Model: ResMed Quattro FX
Humidifier: Built in
CPAP Pressure: EPAP 7.5. PS 0 to 7
CPAP Software: SleepyHead EncoreViewer EncorePro

Other Comments:

Sex: Male
Location: England

Post: #12
RE: Why does my Pressure and Leaks go crazy
Sorry to drag up an old topic but I am doing some forum hopping and I know you are still having problems with the high levels of pressure support.

From the Sleepyhead graphs here I note that when the PS goes sky high, the EPAP also rises. During these same periods the overall flow rate has dropped and so the machine is doing what it is meant to do and trying to maintain a steady flow rate. I agree with Robysue and Palerider that the leaks are not the cause of the increased pressure support.

So the question is why is a PS of 18 still not giving you good flow when a PS of 10 should be more than enough? The answer is high resistance (partial obstruction). Assuming that you are not awake and fighting the machine which is certainly a possibility, this leaves : possible kinking of the tubing, your partially blocked nose or upper airway obstruction. As the flow did not respond to the increased EPAP it is unlikely to be upper airway.

This leaves your nose as the most likely suspect. I am sure that you know all about the potential remedies starting with nasal steroid sprays, regular saline washes (which do work for me) or surgery as a last resort!

Hope this helps.
(This post was last modified: 07-30-2014 04:51 AM by igdoc.)
07-30-2014 04:37 AM
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bwexler Offline

Advisory Members

Posts: 563
Joined: Mar 2012

Machine: PRS 1 BiPAP autoSV Advanced, with Heated Tube humidifier
Mask Type: Nasal mask
Mask Make & Model: Sleepweaver √Član
Humidifier: Resperonics Heated Tube humidifier
CPAP Pressure: Max pressure 25.0 cm H20, Max
CPAP Software: SleepyHead EncorePro

Other Comments: CMS 50i with Software for SpO2

Sex: Male
Location: San Marcos, CA, USA

Post: #13
RE: Why does my Pressure and Leaks go crazy
Yes Ian, I do believe my stuffy nose is the problem.
I will probably have to bite the bullet and resort to a nasal rinse or a full face mask. I have had chronic nasal congestion for years. It is sometimes worse than other times. Now seems to be a period of worse.
07-30-2014 11:46 AM
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