QT

Long QT syndrome: delayed repolarisation, commonly potassium channel defects (LQT1, LQT2).

Long QT syndrome (LQTS) is an inherited condition associated with delayed repolarization of the ventricles.  The most common variants of LQTS (LQT1 & LQT2) are caused by defects in the alpha subunit of the slow delayed rectifier potassium channel. A normal corrected QT interval is less than 430 ms in males and 450 ms in females.