I can't imagine how hard that would be. I just got out of the hospital with multiple pulmonary embolisms. Was very blessed to live through it. You just don't appreciate the things you take for granted, like being able to get a good breath, until you loose it.
btw, I did open the package and look at these and did try one, but the rest have never been used. Of course, I cleaned and put the one back. Just don't think I will ever use it but they do work!