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Marked QT prolongation and torsades de pointes secondary to acute ischemia in an elderly man taking dofetilide for atrial fibrillation: a cautionary tale.
 ( adverse event: taking ,  an elderly man: Subject, elderly: Subject.Age, man: Subject.Gender, Marked QT prolongation and torsades de pointes secondary to acute ischemia: Effect, dofetilide: Treatment, dofetilide: Treatment.Drug, atrial fibrillation: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: taking ,  an elderly man: Subject, elderly: Subject.Age, man: Subject.Gender, Marked QT prolongation and torsades de pointes secondary to acute ischemia: Effect, dofetilide: Treatment, dofetilide: Treatment.Drug, atrial fibrillation: Treatment.Disorder) 