Andersen Tawil syndrome is a rare type of channelopathy characterized by the 
presence of periodic paralysis, cardiac arrhythmia (prolonged QT interval or 
ventricular arrhythmia) and distinct dysmorphic abnormalities. It is a type of 
potassium channelopathy that occurs sporadically or by autosomal dominant 
inheritance. We report a 14 year old boy with Andersen-Tawil syndrome.