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SH: Total Leak less than Leak Rate!
#1
SH: Total Leak less than Leak Rate!
I saw an anomaly in my SH graphs today.

My PRS1 60 series auto says 0% Large Leak in its LCD readout.
SH said I had significant mask leakage for ~12% of the night.

I have attached the graph here. I see that Total Leak and Leak Rate lines are intersecting i.e. Leak Rate is more than Total Leaks. What gives?


[attachment=1196]
PRS1 Auto & Dreamstation Auto w/ P10 and straight pressure of 7cm. 
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#2
RE: SH: Total Leak less than Leak Rate!
It looks like at 7AM your machine had a silicone fart and lost its memory. Did you have any power problems during that period? Also, since I'm a Resmed user, I noticed your pressure graph is different than what I'm use to seeing. Is this display pattern normal for your pressure changes?
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#3
RE: SH: Total Leak less than Leak Rate!
It's my understanding that:

SH reports total leak... including the intentional leak trough the mask vents.
ResScan attempts to report only true leaks.
Or maybe I'm thinking of PR versus ResMed machines...)

He shutdown for about 20 minutes; at about 0630 hours.

The PR pressure graph is sure different than a ResMed's. Looks like a very different algorithm at work.

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#4
RE: SH: Total Leak less than Leak Rate!
(01-18-2015, 06:58 PM)justMongo Wrote: It's my understanding that:

SH reports total leak... including the intentional leak trough the mask vents.
ResScan attempts to report only true leaks.
Or maybe I'm thinking of PR versus ResMed machines...)

He shutdown for about 20 minutes; at about 0630 hours.

The PR pressure graph is sure different than a ResMed's. Looks like a very different algorithm at work.

I did stop the machine for about 10 minutes at around 0630hrs but it was still hooked on to power. And there was no power interruption.

On SH, you can show both "Total Leaks (Intentional + Unintentional)" and "Leak Rate (Unintentional)". I have shown both on the "Leak Rate" graph I attached.

The PR pressure graph is the result of their "hunt and peck" algorithm which is different from the resmed's "rapid escalation and progressive decay wave" algorithm. As long as I sleep on my side, it keeps jumping from 7 to 8.x and back all night.

PRS1 Auto & Dreamstation Auto w/ P10 and straight pressure of 7cm. 
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