• Maala Bhatt, Wei Cheng, Mark G Roback, David W Johnson, Monica Taljaard, and Sedation Safety Study Group of Pediatric Emergency Research Canada (PERC).
• Department of Pediatrics, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada.
• Acad Emerg Med. 2020 Mar 1; 27 (3): 217-227.

BackgroundThe risk of respiratory depression is increased when opioids are added to sedative agents. In our recent multicenter emergency department (ED) procedural sedation cohort, we reported a strong association between preprocedural opioids and sedation-related adverse events. We sought to examine the association between timing of opioids and the incidence of adverse sedation outcomes.MethodsWe conducted a secondary analysis of a prospective cohort of children aged 0 to 18 years who received sedation for a painful procedure in six Canadian pediatric EDs from July 2010 to February 2015. The primary risk factor was timing of opioid administration, adjusted for age, opioid type, preprocedural and sedation medications, and procedure type. Outcomes were 1) oxygen desaturation, 2) vomiting, and 3) positive pressure ventilation (PPV).ResultsOf the 6,295 children in the original cohort, 1,806 (29%) received a preprocedural opioid. Patients receiving preprocedural opioids had a higher incidence of oxygen desaturation (risk difference = 4.3%, 95% confidence interval [CI] = 2.9% to 5.8%), vomiting (risk difference 2.0%, 95% CI = 0.7% to 3.3%), and PPV (risk difference = 1.5%, 95% CI = 0.7% to 2.3%). Multivariable regression with timing of opioids modeled as a restricted cubic spline revealed the risk for each outcome was highest when opioids were administered in the 30 minutes prior to sedation. Timing of opioid administration was statistically significantly associated with oxygen desaturation and vomiting (p < 0.0001) but not with PPV (p = 0.113).ConclusionsTiming of opioids was significantly associated with the risk of oxygen desaturation and vomiting. Being aware of this increased risk will help clinicians prepare for sedation and the potential need for patient rescue.© 2020 by the Society for Academic Emergency Medicine.

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