Practical Geriatrics ›› 2024, Vol. 38 ›› Issue (12): 1260-1265.doi: 10.3969/j.issn.1003-9198.2024.12.016

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Interaction and compatibility optimization of propofol and etomidate in general anesthesia induction of elderly patients undergoing cardiopulmonary bypass assisted cardiac surgery

WU Xiong, GU Xiaoping   

  1. Department of Anesthesiology, Nanjing Drum Tower Hospital, the Affiliated Hospital of Nanjing University Medical School, Nanjing 210008, China
  • Received:2023-11-28 Online:2024-12-20 Published:2024-12-19
  • Contact: GU Xiaoping, Email: xiaopinggu@nju.edu.cn

Abstract: Objective To analyze the interaction between propofol and etomidate in general anesthesia induction in the elderly patients undergoing cardiopulmonary bypass assisted cardiac surgery through response surface methodology, and to explore the optimal compatibility concentration of target controlled infusion of propofol and etomidate. Methods A total of 200 elderly patients who undergoing extracorporeal circulation assisted cardiac surgery and intravenous general anesthesia induction in Nanjing Drum Tower Hospital from September 2019 to January 2022 were enrolled in this study. The starting concentration of propofol and etomidate target controlled infusion was selected, and the post anesthesia bispectral index (BIS), mean arterial pressure (MAP), heart rate (HR), and time to loss of consciousness (TLOC) were observed. Response surface modeling was applied to analyze the pharmacodynamic interaction between propofol and etomidate in anesthesia induction for elderly cardiac surgery, and the optimal concentration range for compatibility was calculated. Results The response surface model showed that propofol and etomidate had a significant synergistic effect on the body movement reaction and circulatory responses during general anesthesia induction in the elderly patients undergoing cardiac surgery. When the concentration of target controlled infusion of propofol was 3.10 μg/mL, the optimal concentration range of etomidate was 0.22 μg/mL; When the concentration of propofol in target controlled infusion was 3.20 μg/mL, the optimal concentration range of etomidate was 0.15-0.20 μg/mL; When the concentration of propofol in target controlled infusion was 3.30 μg/mL, the optimal concentration range of etomidate was 0.15-0.18 μg/mL; When the concentration of propofol in target controlled infusion was 3.40 μg/mL, the optimal concentration of etomidate was 0.16-0.17 μg/mL. Conclusions Propofol and etomidate have a synergistic sedative effect, and the combination of different pharmacological reactions creates the optimal compatibility concentration for propofol and etomidate, which can provide good anesthesia effects.

Key words: etomidate, propofol, response surface model, cardiac surgery, interaction, optimal compatibility concentration

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