Abbreviations:
diastolic blood pressuredexmedetomidineheart rateopioid-free anesthesiapositive end-expiratory pressurequadratus lumborum blockreactionentropysystolic blood pressurestateentropythe surgical pleth indexpulse oxygen saturationtarget controlled infusiontotal intravenous anesthesiaThis project was supported by the Hainan Provincial Natural Science Foundation of China (grant number 821MS165). The funders provided part of the research fee, but they were not involved in the design of the study; collection, analysis, and interpretation of data; or in writing the manuscript.The study protocol was approved by the Institutional Ethics Committee of the Hainan Wanning People’s Hospital (Wanning, China; approval number: SL-2021-002).Written consent for publication was obtained from each patient, their parents or guardians.The authors have no conflicts of interest to disclose.The datasets generated during and/or analyzed during the current study are not publicly available, but are available from the corresponding author on reasonable request.How to cite this article: Dai J, Wu D, Cui X, Li S, Xu F. Application of surgical pleth index in the opioid-free anesthesia: A randomized controlled trial. Medicine 2023;102:43(e35172).