1684
CASE REPORT: A woman of 80 years, on long-term warfarin therapy presented with an acute dissecting thoracic aortic aneurysm; on investigation the only precipitating factor found was an international normalised ratio of 4.8.
 ( adverse event: presented ,  A woman of 80 years: Subject, woman: Subject.Gender, 80 years: Subject.Age, acute dissecting thoracic aortic aneurysm: Effect, on long-term warfarin: Treatment, long-term: Treatment.Duration, warfarin: Treatment.Drug) 
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: presented ,  A woman of 80 years: Subject, woman: Subject.Gender, 80 years: Subject.Age, acute dissecting thoracic aortic aneurysm: Effect, on long-term warfarin: Treatment, long-term: Treatment.Duration, warfarin: Treatment.Drug) 