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Published in: BMC Anesthesiology 1/2024

Open Access 01-12-2024 | Remifentanil | Research

Effect of esketamine on the EC50 of remifentanil for blunting cardiovascular responses to endotracheal intubation in female patients under general anesthesia: a sequential allocation dose-finding study

Authors: Fan Ziqiang, He Keyu, Xue Yun, Liu Li, Bai Yiping

Published in: BMC Anesthesiology | Issue 1/2024

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Abstract

Background

This study aimed to investigate the effect of esketamine on the dose–effect relationship between remifentanil and the cardiovascular response to endotracheal intubation during target-controlled infusion (TCI) of propofol.

Methods

Patients underwent elective gynecological laparoscopic surgery under general anesthesia with endotracheal intubation, aged 18–65 years, American Society of Anesthesiologists class I or II, 18 kg/m2 ≤ body mass index ≤ 30 kg/m2, were randomly divided into the control (group C) and esketamine groups (group E). Before anesthesia induction, group E received an intravenous injection of 0.3 mg/kg of esketamine, while group C received an equal dose of physiological saline. TCI of propofol to the effect-site concentration (EC) of 3.0 μg/mL, and then TCI of remifentanil to the effect room and intravenous injection of rocuronium 0.6 mg/kg after MOAA/S was 0. Endotracheal intubation was performed after 2 min. Dixon’s modified sequential method was used, and the initial EC of remifentanil was 3.0 ng/mL. The EC of remifentanil was determined according to the intubation response of the previous patient, with an adjacent concentration gradient of 0.3 ng/mL. The EC50 and EC95 values and their 95% confidence intervals (CIs) were determined using probit regression analysis.

Results

The EC50 for cardiovascular response inhibition to endotracheal intubation using remifentanil was 3.91 ng/mL (95% CI: 3.59–4.33 ng/mL) and EC95 was 4.66 ng/mL (95% CI: 4.27–6.23 ng/mL) with TCI of propofol 3.0 μg/mL. After intravenous administration of 0.3 mg/kg of esketamine, the EC50 of remifentanil was 3.56 ng/mL (95% CI: 3.22–3.99 ng/mL) and EC95 was 4.31 ng/mL (95% CI: 3.91–5.88 ng/mL).

Conclusions

Combined with TCI of propofol 3.0 μg/mL for anesthesia induction, esketamine significantly reduced the EC50 and EC95 of remifentanil to inhibit the cardiovascular response to endotracheal intubation.

Trial registration

The trial was registered in the Chinese Clinical Trials Registry (www.​chictr.​org.​cn; registration number: ChiCTR2200064932; date of registration:24/10/2022).
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Metadata
Title
Effect of esketamine on the EC50 of remifentanil for blunting cardiovascular responses to endotracheal intubation in female patients under general anesthesia: a sequential allocation dose-finding study
Authors
Fan Ziqiang
He Keyu
Xue Yun
Liu Li
Bai Yiping
Publication date
01-12-2024
Publisher
BioMed Central
Published in
BMC Anesthesiology / Issue 1/2024
Electronic ISSN: 1471-2253
DOI
https://doi.org/10.1186/s12871-024-02454-4

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