Hi CorinneI, and thanks for your post. Like my colleague, John, I have not seen any patients who have had this type of reaction when using a CPAP device.
I have had patients who do not tolerate the CPAP well - either issues with the mask or prongs, or don't adjust to the blowing air in their face, but nothing like an asthma flare-up.
Since this seems to be what is happening to you, you may want to take this up with your prescribing physician, to see what may be going on in your situation.
Please do check back and let us know how this all turns out for you.
Good luck!
Leon (site moderator asthma.net)