If you were unconscious, they would be most likely giving you O2.
A medic alert or similar bracelet would be a good idea if you are that concerned.
But the way I look at it, if I am unconscious, there's other things going on that would be more important. Waiting a few hours to tell them of the xPAP is not going to hurt anything. Any longer than that, and I'd most likely be on O2 or on a ventilator.
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Breathe deeply and count to zen.
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You can list things like a cpap on a MedicAlert bracelet/necklace which EMT's and other medical personnel are trained to locate and use. I use the MedicAlert Foundation for mine...been a member so long my number is only 8 digits long (I think they are up to 10 now). I joined in 1980 when I discovered I was allergic to codeine. When you put in your details, one section is for devices...and the CPAP is listed. You can also upload a document to add to the file if the question isn't already on there. I use to have a Standing Order on there for dealing with me and my insulin pump while hospitalized. I also had a document, signed by my endo, to which diet they were to give me.
That would be a good spot for CPAP settings, etc...
But both of us have medicalert numbers, we both also have our most recent medical file typed and loaded to the dropbox and marked as a favorite (that way you can pull it up without internet access). And we have that access on our smartphones.