Which of the following is seen in torsades de pointes: (A) Hypermagnesemia, (B) Sho QRS complex, (C) Prolonged QTc interval, (D) PQ segment
Answer is C. Torsades de pointes is a complication of prolonged ventricular repolarisation(prolonged QT interval. QT interval >0.44sec in men, >0.46sec in women. Reference: Harrison 20th edition pg 1445