Wendy once bubbled...
You may want to check into the effects of using Sudafed and Afrin and using nitrox or higher O2 mixes. The last person I knew that did is now dead. Not sure if that caused his seizures, but it would be something to maybe check into. I believe that DAN has some reports on the subject, or maybe one of the docs here will know.
No one can, of course, comment with any accuracy without seeing the autopsy report on the case mentioned by Wendy, and, perhaps, not even then, given all the possiblilties.
There is anecdotal evidence, and the beginnings of some research on the subject, however, to indicate that some drugs, such as Sudafed, may potentiate problems in a subject (diver) exposed to high PPO2. We talked about this in my DMT course, but, again, I do not know of any hard research on this subject.
DAN does have some information, but, perhaps, Doc Vikingo will know if any definitive studies exist. I will check with some of the researchers I know, and report back.
Doc????