I agree the alarm is just that, an alarm to indicate your breathing rate has ceased and/or is at levels lower than expected (amount expected input as LPM into the alarm value). My guess is if you put it down at its lowest allowed LPM value that pretty much disables it.
But do you want to do that?
Doing so wouldn't seem to help what caused the alarm to sound in the first place. Those sleep onset events would also be my guess as to what was causing the alarm to sound and most likely from shallow breathing as that to the machine resembles or is central apnea.
So the parameter you want to change restores stabil breathing and as a result of that your LPM should remain high where the alarm no longer sounds.
Setting EPAP to what it takes to clear your AI makes sense to me and would be what I would do.
But keep in mind that machine is also for CSDB where mixed events are seen. My theory on how that functions is it does a better job at avoiding the centrals and manipulates your breathing via other parameters to stablize it.
So the question becomes what parameters on the machine can you change to manipulate your breathing? A wider pressure change? A wider PS setting? If I want you to breathe I allow CO2 to build up in the blood towards Permissive Hypercapnia.
We know that CPAP alone won't do that so my guess is decreasing tidal volume on the machine? is there a setting for that? Hypoxemia is dangerous, Hypercapnia is not.
Man I had the settings and values for that machine somewhere, can't find it on this computer must be on one of my others.
if in AutoSV mode and central events are seen (same as those onset) you would:
-set EPAP to value to eliminate obstructive events.
-set IPAP same as EPAP
-set IPAP Max +10 cm above EPAP
-set Rise time to 2 or 3
You need page 3 of 4 of the titration manual, single page chart,
if you observe for periodic breathing increase IPAP by 2cm, if it does not eliminate events, set fixed BPM rate to 2 less than spontaneous BPM rate. Start I time at a minimum of 1.2 sec.
if periodic is no and central present,
Set fixed rate to a minimum of 10 BPM or 2 below spontaneous respiratory rate.
Start I time 1.2 sec.
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someday science will catch up to what I'm saying...