Feature of Torsade de pointes is
Wide QRS complex
Sho QRS complex
Prolonged QT interval
Sho QT interval
Polymorphic VT that occurs in the context of congenital or acquired prolongation of the QT interval often has a waxing and waning QRS amplitude creat- ing a "twisting about the points" appearance referred to as Torsade de Pointes Ref Harrison 20th edition pg 1443
C.V.S