MONDO_0008222 (Andersen-Tawil syndrome) can be described as follows. Andersen's syndrome (AS) is a rare disorder characterized by periodic muscle paralysis, prolongation of the QT interval with a variety of ventricular arrhythmias (leading to predisposition to sudden cardiac death) and characteristic physical features: short stature, scoliosis, low-set ears, hypertelorism, broad nasal root, micrognathia, clinodactyly, brachydactyly and syndactyly. Also known as: Andersen cardiodysrhythmic periodic paralysis, Andersen syndrome, LQT7, Potassium-sensitive cardiodysrhythmic type, long QT syndrome 7, long QT syndrome type 7.