• Yusheng Yao, Yang Sun, Jiancheng Lin, Wenjun Chen, Ying Lin, and Xiaochun Zheng.
• From the Department of Anaesthesiology, Shengli Clinical Medical College of Fujian Medical University (YY, JL, WC, YL, XZ) and Department of Gynaecology, Fujian Cancer Hospital, Affiliated Hospital of Fujian Medical University (YS).
• Eur J Anaesthesiol. 2020 Dec 1; 37 (12): 1143-1149.

BackgroundDexmedetomidine is being used increasingly as a premedicant in the paediatric population. However, the effectiveness of pre-operative intranasal dexmedetomidine premedication, compared with oral midazolam, for emergence delirium is not well characterised.ObjectiveTo identify the effectiveness of pre-operative intranasal dexmedetomidine for emergence delirium in the paediatric patient population following general anaesthesia.DesignA prospective, randomised, double-blind, parallel-group, placebo-controlled trial.SettingSingle university teaching hospital, from September 2013 to August 2014.PatientsOne hundred and fifty-six patients undergoing anaesthesia for strabismus surgery were included in the study.InterventionPatients were randomised in a 1 : 1 : 1 ratio to receive premedication with intranasal dexmedetomidine 2 μg kg (the dexmedetomidine group), oral midazolam 0.5 mg kg (the midazolam group), or 0.9% saline (the placebo group).Main Outcome MeasuresThe primary outcome was the incidence of emergence delirium assessed by the Paediatric Anaesthesia Emergence Delirium scale. Secondary outcomes included the quality of the inhalational induction, emergence time, postoperative pain intensity, length of stay in the postanaesthesia care unit, the incidence of postoperative nausea or vomiting (PONV) and parents' satisfaction.ResultsThe incidence of emergence delirium was lower in patients given dexmedetomidine compared with that in patients given midazolam (11.5 versus 44%, relative risk = 0.262, 95% confidence interval 0.116 to 0.592) or 0.9% saline (11.5 versus 49%, relative risk = 0.235, 95% confidence interval 0.105 to 0.525). Likewise, the incidence of PONV was lower in the dexmedetomidine group (3.8%) than that in the midazolam (22%; P = 0.006) or placebo (29.4%; P < 0.001) groups. However, there was no difference among the groups concerning postoperative pain scores and length of postanaesthesia care unit stay.ConclusionIn paediatric patients undergoing strabismus surgery intranasal dexmedetomidine 2 μg kg premedication decreases the incidence of emergence delirium and PONV, and improves parents' satisfaction compared with oral midazolam.Trial RegistrationClinicalTrials.gov (identifier: NCT01895023).

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