Leak Rate

General Discussion on any topic relating to CPAP and/or Sleep Apnea.
LabDog
Posts: 7
Joined: Fri Nov 10, 2006 10:55 am

Leak Rate

Post by LabDog » Sat Feb 17, 2007 10:18 am

Thanks to the members here I was able to enter the efficacy data mode on a Resmed VPap III. I found under leak rate - 6L per min. Is this good, bad, or what. I have a inhalation rate of 19 and exhale 16.


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rested gal
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Joined: Thu Sep 09, 2004 10:14 pm
Location: Tennessee

Post by rested gal » Sat Feb 17, 2007 11:19 am

http://thorax.bmjjournals.com/cgi/reprint/61/3/226.pdf

On page 3, in the section "CPAP data" of this study using resmed machines:

"a 95th centile leak of 0.4 l/s was considered acceptable"
ResMed S9 VPAP Auto (ASV)
Humidifier: Integrated + Climate Control hose
Mask: Aeiomed Headrest (deconstructed, with homemade straps
3M painters tape over mouth
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Sleepy-eyes
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Joined: Mon Nov 06, 2006 12:50 pm
Location: Central Oklahoma

Post by Sleepy-eyes » Sat Feb 17, 2007 12:36 pm

Dang! Rested gal, you're just an endless source of information. How do you find all this stuff? Talk about a paper one can become tangled in!!!!!
Chris

I'm not a Doctor, nor am I associated with the medical profession in any way. Any comments I make are just personal opinions. Take them or leave them. (justa don't gripe at me if ya donna like 'em!)

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dsm
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Location: Near the coast.

Post by dsm » Sat Feb 17, 2007 7:37 pm

No doubt about it RG is tops when it comes to locating helpful data no matter the source.

My own experience witht he VPAP III is that I have a UMFF mask & that is set in the menu thus I expect to see 0 leak rates - anything over 0 means the mask is set up incorrectly (wrong menu choice) or there is a leak in the fitting or a leak in the humidifier or the mask vent plug is not pushed home (can get dislodged when cleaning the UMFF mask).

Here are a set of historical charts from some VPAP IIIs I have used - you will see in the early entries that the leak in some is highish but as I got the setup under control the leaks start to show consistent 0.

These charts were produced during various experiments (VPAP III S & VPAP III S/T) - my regular machine is a PB330 Bilevel but it doesn't record nightly data but the VPAP IIIs do a great job of providing AHI HI AI & Minute Ventilation + breathing rate & real leak data (My PB330 is quieter than the VPAPs so it gets the regular use).

The PO data shown in the later charts came from a seperate Ohmeda Pulse Oximeter.

http://www.internetage.com/cpapdata/

DSM

xPAP and Quattro std mask (plus a pad-a-cheek anti-leak strap)