Drug of choice for torsades de pointes?: (A) Terfenadine, (B) Quinidine, (C) Isoprenaline, (D) Magnesium sulphate
Answer is D. Mg sulfate is used for prolonged QT syndrome or Torsades de pointes. Quinidine and terfenadine cause Torsades de pointesRef: Goodman Gillman 11th ed pg 929-930