torsades

 When the heart beats faster than usual, as in the case of torsades de pointes, doctors call it tachycardia. Torsades de pointes is French for “twisting of points” and refers to when the heart's two lower chambers or ventricles beat faster than its upper chambers, known as the atria.

What is the main cause of torsades?

Genetic abnormalities or sometimes certain medicines can cause Long QT interval. If you have a Long QT interval and your ventricles get an extra contraction during the time when they're supposed to be getting ready for the next one, you may get Torsades de Pointes.