Ms Firth , 12 , has a genetic disorder called hypokalemic periodic paralysis . Causes muscle weakness and she becomes paralysed every other day . Has to be rushed to hospital where she is given potassium via an IV drip . Episodes often happen in her sleep and she wakes completely paralysed . Condition is genetic and only affects one person in every 100,000 .
Mia Park , 12 , has a genetic disorder called hypokalemic periodic paralysis . Causes muscle weakness and she becomes paralysed every other day . Has to be rushed to hospital where she is given potassium via an IV drip . Episodes often happen in her sleep and she wakes completely paralysed . Condition is genetic and only affects one person in every 100,000 .