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Efficacy of Intraoperative Dexmedetomidine Compared with Placebo for Postoperative Pain Management: A Meta-Analysis of Published Studies.

INTRODUCTION: Dexmedetomidine (Dex) has sedative, analgesic, and anesthetic-sparing effects. This meta-analysis examines demonstrated intraoperative and postoperative effects of intraoperative Dex administration during pediatric surgery.

METHODS: A search for randomized placebo-controlled trials was conducted to identify clinical trials examining intraoperative Dex use in children, infants, and neonates. Primary outcome was postoperative opioid consumption; secondary outcomes were: postoperative pain intensity and postoperative nausea and vomiting (PONV).

RESULTS: Fourteen randomized controlled trials performed during painful procedures were analyzed. Intraoperative Dex administration was associated with significantly reduced postoperative opioid consumption in the postanesthesia care unit [PACU; risk ratio (RR) = 0.31 (0.17, 0.59), I (2) = 76%, p < 0.0001 and cumulative z score using trial sequential analysis], decreased pain intensity in PACU [standardized mean difference (SMD) = -1.18 (-1.88, -0.48), I (2) = 91%, p < 0.0001] but had no effect upon PONV incidence [RR = 0.67 (0.41, 1.08), I (2) = 0%, p = 0.48]. Subgroup analyses found administering Dex during adenotonsillectomy and using a bolus <0.5 µg/kg (irrespective to the use of a continuous administration) without effects on studies outcomes. Heterogeneity was high among results and a high suspicion of publication bias was present for all analyzed outcomes.

CONCLUSIONS: This meta-analysis shows that intraoperative Dex administration in children reduces postoperative opioids consumption and postoperative pain in PACU. According to our results, optimal bolus dose was found to be ≥0.5 µg/kg. Future studies have to explore this particular point and the postoperative analgesic effects of Dex during longer periods.

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