Impaired function of the voltage-gated potassium channels Kv7.1 (encoded by KCNQ1) and Kv11.1 (encoded by KCNH2), caused by inheritable mutations or drugs leads to long QT syndrome (LQTS) characterised by malignant cardiac arrhythmias [1]. Here, KCNH2 is linked to Prolonged QT interval.