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We observed ventricular fibrillation in 2 patients who presented to the emergency department with pre-excited atrial fibrillation and were given 12 mg of adenosine.
 2 patients who presented to the emergency department with pre-excited atrial fibrillation: Subject; 2: Subject.Population; ventricular fibrillation: Effect; 12 mg of adenosine: Treatment; pre-excited atrial fibrillation: Treatment.Disorder; 12 mg: Treatment.Dosage; adenosine: Treatment.Drug
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: adverse event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Subject.Disorder, Treatment.Route, Subject.Race, Treatment.Time_elapsed, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 2 patients who presented to the emergency department with pre-excited atrial fibrillation: Subject; 2: Subject.Population; ventricular fibrillation: Effect; 12 mg of adenosine: Treatment; pre-excited atrial fibrillation: Treatment.Disorder; 12 mg: Treatment.Dosage; adenosine: Treatment.Drug