Red Line by Philips Respironics System One in SleepyHead

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Red Line by Philips Respironics System One in SleepyHead

Berichtdoor Ruud J, » 24 apr 2016 -12:20

Philips Respironics System One: There is no official "line in the sand" for flagging a Large Leak.
(Source Encore Report Guide)
Lots of System One user data posted on CPAP forums indicates the Large Leak line for Total Leak Rate depends on whether the machine is a Series 50 (older) System One or a Series 60 (newer) System One. Lots of user data posted on CPAP forums also indicates that the Large Leak line depends on the pressure used: People using less than 10 cm of pressure see Large Leaks being flagged much earlier than people using pressures greater than 10 cm. Here are some general estimated guidelines for where the undefined PR Large Leak line is located:

Series 60 System One users may start to see Large Leaks being flagged when the Total Leak Rate reaches 60-70 L/min; if the prescribed pressure setting is below about 8cm, then Large Leaks may be flagged when the Total Leak Rate reaches 50-60 L/min in some circumstances.
Series 50 System One users may start to see Large Leaks being flagged when the Total Leak Rate reaches 80-90 L/min; if the prescribed pressure setting is below about 8cm, then Large Leaks may be flagged when the Total Leak Rate reaches 60 L/min in some circumstances.
Official Large Leaks for PR System One machines are very difficult to determine with great accuracy in versions of SH prior to SH 0.9.6. In SH 0.9.6, the Encore-defined Large Leaks are flagged by gray bars in the Events table and as a gray background in the Flow Rate curve. The Official Large Leaks for a System One will NOT be flagged directly on the SH Leak/Total Leak graph.
If you want to add a Redline to your Leak/Total Leak graphs in SleepyHead, my advice is to look at your own Large Leak flags and figure out where they seem to start. If you don't seem to have very many Official Large Leak, then use the above guidelines as a decent enough starting guess for where your particular Redline should be drawn.

http://www.apneaboard.com/forums/Thread ... 4#pid73574

Kind Regards RuudJ
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Ruud J,
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