Hi Jude, and thanks for your post. You've posed an interesting question. As you are no doubt aware, one of the main symptoms of certain types of asthma can be wheezing.
As well, several heart conditions (including atrial fibrillation), may also result in wheezing.
As you pointed out, it is not always easy for a patient to determine which medical condition is causing the wheezing. And naturally, if you are not sure, the question arises as to whether to use the (rescue) inhaler.
My suggestion would be for you to discuss this with the doctor(s) who are providing you with medical care. They should be able to guide you as to what course of action to take when you find yourself in this situation.
Please do check back and let us know how this all turns out for you.
What do you think?
Leon (site moderator asthma.net)