AirSense 11 and Flow Limits

[MaskedSleeper]

From my understanding, the fix for flow limitations is to add EPR. So if EPR is the fix, what is the reason for Resmed machines jacking up both the IPAP and EPAP pressures at the same time in response to flow limitations during the night? Wouldn't it make more sense for the machine to only add additional IPAP, or am I missing something here?

[ozij]

From my understanding, the fix for flow limitations is to add EPR. So if EPR is the fix, what is the reason for Resmed machines jacking up both the IPAP and EPAP pressures at the same time in response to flow limitations during the night? Wouldn't it make more sense for the machine to only add additional IPAP, or am I missing something here?

EPR is not "the fix for flow limitations".
A change in EPR, up or down, helps some people.

True flow limitations (as identified in a sleeping person in the lab, with concurrent effect on either oxygenation or sleep) are treated with a raise in IPAP.

No ResMed Auto machine has the option (or the ability) to vary the IPAP - EPAP differential automatically. The difference between them stays constant. And it's sometimes doubtful whether its identification of flow limitations is valid.

[palerider]

From my understanding, the fix for flow limitations is to add EPR. So if EPR is the fix, what is the reason for Resmed machines jacking up both the IPAP and EPAP pressures at the same time in response to flow limitations during the night? Wouldn't it make more sense for the machine to only add additional IPAP, or am I missing something here?

EPR is a DROP in pressure, so EPR, by itself, isn't what 'fixes' flow limitations.

[ChicagoGranny]

From my understanding, the fix for flow limitations is to add EPR.

This is controversial. It seems to work for me. It can be seen in my OSCAR charts. But there are so many variables in sleep and sleep breathing that a firm conclusion is not possible. EPR seems not to help with FLs in many people.

[MaskedSleeper]

Thanks for the clarifications. Some sources I've read insist that EPR will reduce flow limits, yet since switching from a nasal to full face mask, mine seem to be almost identical with or without EPR. The only difference being I get a higher AHI with EPR on (both central and obstructive events).

[lynninnj]

My “fix” for flow limits is to try to fix what may be limiting my anatomical flow.

I have seen MY FL rise when I have a stuffy nose.

I use a menthol inhaler called Olbas and make sure the humidity is up on the machine. Between the two it is like stepping into a hot shower and opens up the nasal passages.

hth

(sorry I know it doesn’t address the issues with the machine but maybe it will help you)

[ChicagoGranny]

I use a menthol inhaler called Olbas

It's good to hear that Olbas works for you. Others with minor congestion might want to try it based on your recommendation. A couple of points, there are other brands that are cheaper. Secondly, its ingredients (Menthol, oils of peppermint, cajeput and eucalyptol) are just herbal remedies with no real medicine.

make sure the humidity is up on the machine

High humidity causes nasal congestion in some people. Users need to do trial and error to find out what works for them in changing conditions.

what may be limiting my anatomical flow.

If by anatomical you mean what I think you mean, all OSA issues relate to improving airflow through the air passages.