<prompt> Feature of Torsades de pointes is?Normal P wavesSho QRS complexProlonged QTc intervalSho QTc interval  <response>: Torsades de pointesPolymorphic V. Tachycardia-Prolonged QTc interval QTcC means corrected T wave,as it does not end immediately. T wave goes in slight gradual slope, so we exactly cannot pin point end of the T wave. So to pin point end of T wave ,mathematical scenario called as QTc is used 