I has a resident with one shunt at age 12, now he s in 36 years old. He has a big history of seizure, vomited and episode. of lethargy that usually for several hours. The doctor that made the operation told the mother that when he(or resident now) coming old the shunt need to be chanted, my question is, all the symptom that he has for several years are because the shunt is the same or is ok, also what do you think about that.