Repeat Intravenous Ketamine Dosing in Children Undergoing Emergency Department Procedural Sedation.

Background: Patients undergoing procedural sedation with intravenous ketamine often receive repeat doses to maintain dissociation; however, data between doses are lacking.

Objectives: The purpose of this study was to characterize the frequency, time interval, and dosages of ketamine received by children undergoing procedural sedation and to explore the effects of age and body mass index on these parameters.

Methods: This was a retrospective study of patients 1 to 18 years of age undergoing procedural sedation with intravenous ketamine in a pediatric emergency department between October 2016 and June 2017. Total repeat ketamine dosages were standardized to a 1-h sedation.

Results: Four hundred nineteen patients were included in the analysis. The median sedation time was 33.0 minutes (interquartile range [IQR] 25.0-45.0). Three hundred sixty-three patients (86.6%) received at least 1 repeat ketamine dose. The median time between doses was 7.0 minutes (IQR 5.0-12.0). Children <6 years of age, compared with older children, received higher hourly doses of ketamine in mg/kg/h (2.8 [IQR 1.8-3.9] vs. 1.8 [IQR 1.2-2.6], p < 0.01). Children <3 years of age, compared with older children, received the highest hourly dose of ketamine in mg/kg/h (3.7 [IQR 2.3-5.0] vs. 1.9 [IQR 1.4-2.8], p < 0.01). Ketamine repeat and hourly dosing does not appear to be significantly different in children of differing body mass index classes.

Conclusions: Patients undergoing ketamine sedation often receive repeat doses to maintain dissociation. Patients <3 years of age received the highest total repeat ketamine dosages.