<prompt> Feature of Torsade de pointes isWide QRS complexSho QRS complexProlonged QT intervalSho QT interval  <response>: 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 