Annie,

My pulse gets high also when my MG is bad. I talked to my neuro about it and he said it has nothing to do with MG, that I should go to my general doctor to get it checked out. I know it is the MG, it is very obvious, it only happens when I push myself and this never happened to me before MG.
So I am going to go to my regular doctor and see what they say, although it is very unlikely they will see the high pulse, but at least I will have it documented by a doctor that I am reporting this symptom (I am thinking about future application for disability).

Thanks