but doesn't exposure to OP's cause inverted T waves ?
May well be right, but I've not been able to find any evidence today.
Have just spent the last hour or so looking through numerous documents thrown up by Google. Hundreds of references to "
inverted T waves" and just as many hundreds of references to "
organophosphates", but have so far not come across anything at all which confirms the latter being proven as a cause of the former.
As with all associations, the two could easily co-exist in one individual by chance, without any direct cause-effect relationship. If the proof were there I would, of course, be happy to see it.