• Dan Wang, Juan Xu, Xiao-Lin Yang, Yan-Xia Guo, Ping-Ping Jiang, and Guo-Yuan Zhang.
• Department of Anaesthesia, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, Sichuan, China.
• BMC Anesthesiol. 2021 Sep 24; 21 (1): 231.

BackgroundTo investigate the effects of different plasma target concentrations of remifentanil on the minimum alveolar concentration (MAC) for blocking adrenergic response (BAR) of sevoflurane in children with laparoscopic herniorrhaphy.MethodsSeventy-five children with 3-7 years old scheduled for laparoscopic herniorrhaphy were randomly divided into group R0, group R1, and group R2 according to different remifentanil plasma target concentration (0, 1, and 2 ngml-1), respectively. The MACBAR of sevoflurane was determined by the up-and-down and sequential method in each group. The concentrations of epinephrine and noradrenaline were also determined at corresponding time points.ResultsA total of 52 child patients were used among the anticipated 75 patients. In groups R0, R1, and R2, the MACBAR of sevoflurane was (3.29 ± 0.17) %, (2.12 ± 0.10) % and (1.29 ± 0.11) %, respectively, and a significant difference was found among the three groups (P<0.05). The changes of epinephrine and noradrenaline concentrations in each group before and after insufflation of carbon dioxide pneumoperitoneum showed no significant differences.ConclusionRemifentanil by target-controlled infusion can effectively reduce the MACBAR of sevoflurane during laparoscopic surgery in children. At a similar effect of MACBAR, both the changes of epinephrine and noradrenaline concentrations are not affected by the infusion of different remifentanil target concentrations.Trial RegistrationThe trial was registered at http://www.chictr.org.cn ( ChiCTR1800019393 , 8, Nov, 2018).© 2021. The Author(s).

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