1174
In a postural challenge test after administration of isosorbide dinitrate (5 mg), blood pressure decreased from 120/67 to 65/35 mmHg, followed by syncope with a sudden decrease in pulse rate from 85 to 60 beats/min.
 ( adverse event: after ,  blood pressure decreased: Effect, syncope: Effect, a sudden decrease in pulse rate: Effect, administration of isosorbide dinitrate (5 mg): Treatment, isosorbide dinitrate: Treatment.Drug, 5 mg: Treatment.Dosage) 
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: after ,  blood pressure decreased: Effect, syncope: Effect, a sudden decrease in pulse rate: Effect, administration of isosorbide dinitrate (5 mg): Treatment, isosorbide dinitrate: Treatment.Drug, 5 mg: Treatment.Dosage) 