I just spent about three hours in hospital while they investigated my chest pain. After doing all the heart-related tests, the doctor ruled my pain could be due to my vp shunt. Thought that kind of strange, but your explanation of scar tissue building around the shunt has me thinking you may have something there. The doctor has sent me home for the night, but I'm going out of town for a CT scan in the next day or two. I think after reading this I'll ask him about the possibility scar tissue has built up along the shunt. Might explain a few things which have been happening.