2631
EA signs were observed in all 7 patients in association with propofol TIVA but did not recur in any of 123 subsequent anesthetics sessions during which low-dose ketamine was added to propofol.
 all 7 patients: Subject; 7: Subject.Population; EA signs: Effect; propofol TIVA: Treatment; low-dose ketamine was added to propofol: Treatment; propofol: Treatment.Drug; ketamine: Treatment.Drug; propofol: Treatment.Drug; TIVA: Treatment.Route; low-dose: Treatment.Dosage; propofol: Combination.Drug; ketamine: Combination.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:
 all 7 patients: Subject; 7: Subject.Population; EA signs: Effect; propofol TIVA: Treatment; low-dose ketamine was added to propofol: Treatment; propofol: Treatment.Drug; ketamine: Treatment.Drug; propofol: Treatment.Drug; TIVA: Treatment.Route; low-dose: Treatment.Dosage; propofol: Combination.Drug; ketamine: Combination.Drug