Leak Calculation
Leak Calculation
I am having a discussion with someone about leaks...Is the exhaust from the mask considered in the leak calculation? If so, how?
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Machine: ResMed AirSense™ 10 AutoSet™ CPAP Machine with HumidAir™ Heated Humidifier |
Mask: Fisher & Paykel Vitera Full Face Mask with Headgear (S, M, or L Cushion) |
Additional Comments: Back up is S9 Autoset...... Buckwheat hull pillow |
Re: Leak Calculation
Depends....on machine and how it gets reported.
ResMed only reports excess leak...and they do take into account the vent rate before reporting somehow but they never really explain exactly how they do it. I suspect that mask type setting plays a part but probably isn't the only factor.
Vent rate gets subtracted before ResMed machines ever report a leak. How they come up with the "vent rate"...million dollar question.
Respironics report total leak...as do most of the other brands I think. Means vent rate and excess leak are added together.
ResMed only reports excess leak...and they do take into account the vent rate before reporting somehow but they never really explain exactly how they do it. I suspect that mask type setting plays a part but probably isn't the only factor.
Vent rate gets subtracted before ResMed machines ever report a leak. How they come up with the "vent rate"...million dollar question.
Respironics report total leak...as do most of the other brands I think. Means vent rate and excess leak are added together.
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Machine: AirCurve™ 10 VAuto BiLevel Machine with HumidAir™ Heated Humidifier |
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If you want to try the Eclipse mask and want a special promo code to get a little off the price...send me a private message.
Re: Leak Calculation
Depends on the machine. Respironics, no. others, not sure.
Resmed, yes. I've watched the VPAP Auto's display when first turning the machine on and the displayed leak varies greatly within the first few breaths, until the machine calculates a baseline vent rate and then the 'leak' settles down to 0 as one breathes in and out.
Someone a few years back posted a thing about the math involved, and it was over my head, but one can make some evaluations by watching the rise and fall of the flow rate.
There are some 'sanity checks' in there somewhere, where if you start off with one of the O2 ports open on a mask, it'll show a baseline leak even with the calculation stuff.
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Accounts to put on the foe list: dataq1, clownbell, gearchange, lynninnj, mper!?, DreamDiver, Geer1, almostadoctor, sleepgeek, ajack, stom, mogy, D.H., They often post misleading, timewasting stuff.