<prompt> Which of the following is seen in torsades de pointesHypermagnesemiaSho QRS complexProlonged QTc intervalPQ segment  <response>: Torsades de pointes is a complication of prolonged ventricular repolarisationprolonged QT interval. QT interval 0.44sec in men, 0.46sec in women. Reference: Harrison 20th edition pg 1445 