• Jiang Zhu, Hong Xie, Lingwei Zhang, Liuhui Chang, and Peimin Chen.
• Department of Anesthesiology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, Jiangsu, China.
• Int J Surg. 2018 Jan 1; 49: 1-9.

ObjectiveThis meta-analysis aims to evaluate the effectiveness of intravenous infusion of ketamine for pain control after laparoscopic cholecystectomy (LC).MethodsA systematic search was performed in PubMed (1966-2017.08), Medline (1966-2017.08), Embase (1980-2017.08), ScienceDirect (1985-2017.08) and the Cochrane Library. Only randomized controlled trials (RCTs) were included. Meta-analysis was performed using Stata 11.0 software.ResultsA total of six RCTs were retrieved involving 294 patients. The present meta-analysis showed that there were significant differences between groups in terms of visual analogue scale scores at 12 h (WMD = -0.478, 95% CI: -0.934 to -0.021, P = 0.040), 24 h (WMD = -0.550, 95% CI: -1.099 to -0.002, P = 0.049), and 48 h (WMD = -0.350, 95% CI: -0.678 to -0.021, P = 0.037) after LC. Significant differences were found regarding opioid consumption at 12 h (WMD = -2.820, 95% CI: -5.170 to -0.470, P = 0.019), 24 h (WMD = -3.816, 95% CI: -7.155 to -0.478, P = 0.025), and 48 h (WMD = -2.210, 95% CI: -4.046 to -0.375, P = 0.018) after LC.ConclusionIntravenous ketamine infusion significantly reduced postoperative pain scores and opioid consumption after LC. In addition, there were fewer adverse effects in the ketamine groups. Higher quality RCTs are still required for further research.Copyright © 2017 IJS Publishing Group Ltd. Published by Elsevier Ltd. All rights reserved.

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