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PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
#1
PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
Resmed ASV Airsense 10 PRESSURE GOES  UP WHEN RESP RATE is LOW, BUT NOT ALWAYS

There are cases early in sleep cycle where  pressure does go up to max, but resp rate  is not down.
Later in sleep cycle, pressure highs track resp rate lows closely.
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#2
RE: PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
I think you need to post some data charts to see what is going on.
It should not max out unless it is reaching the pressure it is set to as a max i.e. 15, but if it is going to the max pressure the machine is capable of, something is not right.
I am NOT a doctor.  I try to help, but do not take what I say as medical advice.


Every journey, however large or small starts with the first step.

Sleep-well
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#3
RE: PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
(02-07-2018, 02:17 PM)villiewe Wrote: Resmed ASV Airsense 10 PRESSURE GOES  UP WHEN RESP RATE is LOW, BUT NOT ALWAYS

There are cases early in sleep cycle where  pressure does go up to max, but resp rate  is not down.
Later in sleep cycle, pressure highs track resp rate lows closely.

Sounds like possible mask leaks to me, which cause the machine to track higher to try to chase them. You need to post some charts.
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#4
RE: PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
Let me approach the question another way:

I have tried holding my breath for a long time while I am awake but I do not get the pressure increase that I would expect.

The doctor tells me that this is because the machine calculates an algorithm over several minutes so that i cannot affect the machine by holding my breath!

Does that make sense?
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#5
RE: PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
..oops, misread which machine you were using
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#6
RE: PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
It sounds like it has to do with the way your backup settings have been set. The machine will increase pressure to respond to apnea events while your breathing. It will also increase pressure when your not breathing based on the backup settings.

Someone with ASV background will come along and help you with adjusting it if needed.
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#7
RE: PRESSURE UP WHEN RESP RATE LOW, BUT NOT ALWAYS
It would help tremendously if you posted a sleepyhead chart with the machine settings on it. Your profile offers no help. A Resmed ASV cannot be an Airsense and a pressure of 8-13 is auto CPAP. I would expect to see mode, EPAP min, EPAP max, PS min, PS max. The AirCurve 10 ASV device uses breath phase mapping to provide a timed backup rate that is synchronized with the patient’s own breathing. When the patient deviates from the ventilatory target, the ASV device aims to stabilize the patient by adjusting Pressure Support. If necessary, it will adjust the timed backup rate from one that matches the patient’s own recent rate towards the built-in default 15 BPM backup rate.

One possibility is that if you take an inhaled breath and hold it, that is not a normal apnea that the machine would target with increased pressure support...you already have a lung full of air, and the machine knows that. So where would the mandatory breath go if pressure support were applied? The simple answer is, by taking in a breath and holding it, you have turned off the PS response. If you want to test the pressure support, try holding your breath following exhale, and I bet your results will be dramatically different.
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