984
Based on this experience, we suggest that low-dose ketamine added to propofol may be associated with prevention of EA in children with a history of EA with propofol TIVA.
 ( potential therapeutic event: prevention ,  children with a history of EA with propofol TIVA: Subject, EA with propofol TIVA: Subject.Disorder, children: Subject.Age, low-dose ketamine added to propofol: Treatment, EA: Treatment.Disorder, ketamine: Treatment.Drug, propofol: Treatment.Drug, low-dose: Treatment.Dosage, ketamine: Combination.Drug, propofol: Combination.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:
 ( potential therapeutic event: prevention ,  children with a history of EA with propofol TIVA: Subject, EA with propofol TIVA: Subject.Disorder, children: Subject.Age, low-dose ketamine added to propofol: Treatment, EA: Treatment.Disorder, ketamine: Treatment.Drug, propofol: Treatment.Drug, low-dose: Treatment.Dosage, ketamine: Combination.Drug, propofol: Combination.Drug) 