(03-21-2015, 04:26 PM)bettis1 Wrote: My vendor told me that some masks normally have a higher leak rate than others. Is this normal with the Simplus?
If that is the case, it would seem that there should be some adjustment to the software to take that into consideration.
There are two kinds of leaks: "Intentional leak" and "Everything else" 8-)
All masks have an air-bleed hole to exhaust air from the hose and mask. This is how you get fresh air: regardless of how you're breathing, the machine's blower sucks up air, blows it down the hose and a percentage goes out the air-bleed hole.
If the hole was plugged, you wouldn't be getting any fresh air or oxygen and it would get very "exciting" very quickly. Intentional leaks are good.
The intentional leak rate is described in the brochure that came with the mask and varies according to your machine's pressure, but you really don't need to be concerned with it, except that at very low pressures (~4), some masks don't ventilate enough fresh air. As long as the only leaks are where they should be, everything will be just fine.
The other leaks are from the mask not sealing well against your face. These are annoying because the make the humidifier use water faster and not work as well, and if they're bad enough, prevent your machine from being able to tell what kind of events you're having and respond to them.
If you're not getting any/much mask leakage, you can pretty much ignore the intentional leak. If should be just fine.
You can tell what kind of leak you have by finding the leak rate and pressure at any given time, in sleepyhead and comparing it to the chart that came with your mask. If you're leaking a lot more than the chart indicates, you have a problem with fit, or possibly your mouth is opening.
You can sometimes tell what kind of leak you have by how you feel. If your mouth and throat feel like they've been stuffed full of toilet paper, you're probably opening your mouth. If not, it's probably leaking out around the mask somewhere.