1743
Based on our experience and on previously published data, serum ammonia levels appear to be indicated in all ED patients on valproic acid therapy who present with altered mental status.
 ( adverse event: present ,  all ED patients: Subject, altered mental status: Effect, valproic acid therapy: Treatment, ED: Treatment.Disorder, valproic acid: 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: present ,  all ED patients: Subject, altered mental status: Effect, valproic acid therapy: Treatment, ED: Treatment.Disorder, valproic acid: Treatment.Drug) 