Here's a little more clarification on the leak line graphs from the PR System One machines in the SleepyHead reports.
As shown in the image below...there are 2 leak lines...
top line is for Total Leak (mask vent rate plus excess leaks) and the bottom line is for excess leaks only.
Calculating Excess leaks only is/was troublesome for SleepyHead due to the number of variables involved.
Since Encore and Respironics normally use "Total Leak" numbers I normally just tell people to ignore the bottom leak line and just understand the top leak line....at least till a person gets more comfortable with the data available.
Encore software will flag large leaks...SleepyHead doesn't but it isn't hard to come up with a close approximation as to where large leak territory would be when looking at a SleepyHead report.
Large leak territory using a Respironics machine is going to vary a bit depending on machine, mask and pressures used.
So there is no single exact number where we can say above this and there's a problem and below this and there isn't a problem.
In general....large leak territory doesn't begin until someone gets into the 80 to 90 L/min ranges. Stay below those total leak numbers and the machine can compensate for those leaks.
If a person just HAS to know if the total leak that they are seeing reported by Sleepyhead constitutes any large leak flags...Encore software must be used. Normally it is not needed though....if the worst leak a person ever sees being reported is 55 L/min....it won't ever get a large leak flag.
and it sure isn't going to be anywhere near where it would negatively impact therapy.
Now if a leak impacts sleep quality...it needs to be fixed even if it is a tiny leak but needs to be fixed because it wakes a person up and not because it is causing the entire therapy to be worthless.
In the report above...example of a typical night for me...the leak spikes are probably a bit of mouth breathing going on.
I sleep right through those spikes...they are well below large leak territory....so I just shrug my shoulders and move on.
I am not going to go to extraordinary measures to try to prevent or fix those spikes...sometimes the cure is worse than the disease.
Which leak line to concentrate on? Depends on how you like to look at your reports....just make sure you understand what you are looking at and it really doesn't matter.