just found out that my partners side of the family are all at high risk of QT syndrom there has already been five death from this in there family my mother in law has it and my partner and ds is in the high risk of having it waiting to be tested it supposed to cause a sudden mass heart attack and is very common to happen in there teenage years with no chance of resus ive done a serch for it but cant seem to find out anything about it anyone else heared of it before