Sedoanalgesia With Ketamine in the Emergency Department: Factors Associated With Unsatisfactory Effectiveness

Ketamine is a safe and widely used sedative and analgesic in children. The purpose of this study is to evaluate the response to sedoanalgesia for painful procedures in the pediatric emergency department.

A retrospective study was conducted in children younger than 16 years who underwent painful procedures with intravenous/intranasal ketamine between January 2016 and December 2022. We collected demographic variables, effectiveness, route of administration, indication, dose, sedation strategy, duration of procedure, and associated adverse effects.

A total of 671 ketamine sedation procedures (411 males/260 females) were included, with a mean age of 7.2 years. Closed reduction was the most common painful procedure (53.8%), followed by burn healing (24.6%). Ketamine was administered intravenously in 93.4% of procedures and intranasally in 6.6%. The result of sedoanalgesia was satisfactory in 84.9% and unsatisfactory in 15.1%. The percentage of cases with unsatisfactory analgesia was higher with intranasal administration (36.4%; P < 0.001). In the intravenous group, the percentage of cases with unsatisfactory effectiveness (28.7%) was higher for patients younger than 2 years of age ( P < 0.001). Arthrocentesis procedures were associated with the highest percentage of unsatisfactory sedoanalgesia failures among patients receiving intravenous ketamine (39.3%; P < 0.001). Intranasal ketamine patients who received a dose between 3.6 and 4 mg/kg had a significantly higher percentage of unsatisfactory sedoanalgesia (66.7%; P = 0.048). Patients receiving intravenous ketamine had significantly higher rates of unsatisfactory sedoanalgesia when the initial dose interval was 1.6 to 2 mg/kg (11.8%; P = 0.002) and when the final total dose was also 1.6 to 2 mg/kg (17.6%; P = 0.002).

This study concludes that intravenous/intranasal ketamine can provide safe and successful analgesia in pediatric patients in the ED. At intravenous doses of 1-1.5 mg/kg, good effectiveness was achieved in almost 90% of cases. Arthrocentesis had the highest percentage of unsatisfactory results. Repeat dosing should be considered for procedures longer than 20 minutes.