Long QT Syndrome 7

**Semantic type:** Disease or Syndrome

**Definition:** A subtype of long QT syndrome caused by mutation(s) in the KCNJ2 gene, encoding inward rectifier potassium channel 2. It is characterized by ventricular arrhythmia, muscle weakness, and developmental abnormalities which include micrognathia, low-set ears and deformities of the fingers.

**Synonyms:** - ATS - Andersen Syndrome - Andersen-Tawil syndrome - LQT7