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An 8-year-old girl is brought to the emergency department after being found unconscious on the playground during school recess. An electrocardiogram shows ventricular tachycardia with a rate of 170/min, and a prolonged QT of approximately 0.5 seconds. When her parents arrive, the mother says that there is a family history of arrhythmias. Which of the following drugs is contraindicated for the treatment of this child?
A. Adenosine
B. Flecainide
C. Metoprolol
D. Procainamide
E. Verapamil
A. Adenosine
B. Flecainide
C. Metoprolol
D. Procainamide
E. Verapamil