Torsade-de- pointes is caused by-
Hypermagnesemia
Metabolic acidosis
Hypomagnesemia
Metabolic alkalosis
Torsades-de-pointes is a form of VT seen as a complication of prolonged ventricular repolarisation. It is seeen in hypomagnesemia. It is not seen in hypermagnesemia,metabolic acidosis,metabolic alkalosis Ref Harrison 20th ed pg 1436
C.V.S