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Epr and pressure settings
#21
RE: Epr and pressure settings
It applies either way. I think it will make little difference if you reduce pressure. You are treating flow limitations with EPR, and unless you have bilevel, I don't foresee much change.
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#22
RE: Epr and pressure settings
So if I understand what you are saying that it doesn’t make much difference what the min pressure setting is?
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#23
RE: Epr and pressure settings
In your case, the Autoset algorithm will always raise pressure to the maximum due to flow limitations. It is not uncommon for us to simply recommend using CPAP mode, or setting minimum and maximum pressure the same. There is no reason to use a range, when that range is overruled by the flow limits without other events.
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#24
RE: Epr and pressure settings
    I think I understand. Can you take a look at this chart. it was back on 3/13 with pressure set at 7-12. What happened in the middle of the night?
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#25
RE: Epr and pressure settings
Another question. AHI does not include the RERA number. Should RERA be considered when looking for the max pressure number?
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#26
RE: Epr and pressure settings
(03-19-2020, 03:19 PM)Deweym Wrote: Another question. AHI does not include the RERA number. Should RERA be considered when looking for the max pressure number?

IMHO, Yes.

RDI = AHI + RERA

RERAs are a series of flow limitations ending in arousal.  Thinking of Obstructive events on a continuous scale

Apnea: 80-100% obstruction/restriction for 10 seconds
Hypopnea: 50-80% obstruction/restriction for 10 seconds
Flow Limitation: <50% obstruction/resiriction
Normal Brerathing: no obstruction/restriction

I like to eliminate all flagged RERAs,  EPR/Pressure Support is the best tool to use.
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#27
RE: Epr and pressure settings
(03-18-2020, 01:16 PM)Deweym Wrote: I think I understand. Can you take a look at this chart. it was back on 3/13 with pressure set at 7-12. What happened in the middle of the night?

We would need to look at 2-minute zooms before or at the time the pressure transitions from 12 and flow limitation suddenly ends. If you can capture that transition, it miht help understand why the machine suddenly did not detect flow limit and reduced pressure.
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#28
RE: Epr and pressure settings
What do you mean by flagged RERA"s?
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#29
RE: Epr and pressure settings
If you look at the bottom line of the events chart I saw a RERA event which shows as a yellow mark/flag on the RE line. Typically, not always, a detailed review of the flow rate graph will show more RERA events, these are 'unflagged' RERA events.
Gideon - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter

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#30
RE: Epr and pressure settings
        I have attached two screenshots of different graphs for that night.
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