1. The combined induction of intubation with propofol and remifentanil is widely used in clinical anesthesia, primarily through a single intravenous injection. Target-controlled infusion (TCI) technology, which combines pharmacology with clinical practice, offers a more stable and precise infusion mode; 2. This project aims to explore the half-effective concentration (EC50) of propofol combined with remifentanil for inhibiting tracheal intubation stimulation through a sequential approach under the monitoring of qNOX pain index.
Patients undergoing elective surgery, aged 19 to 55 years, with ASA I or II, were selected for a sequential trial in two stages: 1. In the first stage, induction dose of ciprofol was fixed at 0.4 mg/kg, and the EC50 and EC95 (exploratory) of remifentanil were measured. 2. In the second stage, the concentration of remifentanil was fixed, and the EC50 and EC95 (exploratory) of ciprofol were measured. The EC and 95% confidence interval (CI) were calculated using the probit probability unit method. 3. Additionally, the effectiveness of the qNOX index in guiding tracheal intubation stimulation was evaluated by analyzing the receiver operating characteristic (ROC) curves.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Enrollment
66
Cipofol combined with remifentanil administered via target-controlled infusion for inhibiting tracheal intubation stimulation in adults under qNOX pain index monitoring.
The Third Affliated Hospital of Guangzhou Medical University
Guangzhou, Guangdong, China
Half-effective concentration
Time frame: Calculated using SPSS software based on the TCI target concentration set during anesthesia induction (the fixed value of the inducing dose does not change over time).
Heart rate
Time frame: 1 min before intubation, during intubation (within 1~1.5 min) and 5 min after intubation (take the average of three measurements at each stage).
blood pressure
Time frame: 1 min before intubation, during intubation (within 1~1.5 min) and 5 min after intubation (take the average of three measurements at each stage).
CCS score (intubation score)
Time frame: within 1 min while intubation (satisfactory intubation conditions simultaneously meet: visible laryngoscope exposure, no vocal cord movement, no coughing, relaxed jaw, no limb movement; otherwise, it is considered unsatisfactory intubation conditions)
BIS index
Time frame: 1 min before intubation, during intubation (within 1~1.5 min) and 5 min after intubation (take the average of three measurements at each stage).
qNOX index
Time frame: 1 min before intubation, during intubation (within 1~1.5 min) and 5 min after intubation (take the average of three measurements at each stage).
EMG index
Time frame: 1 min before intubation, during intubation (within 1~1.5 min) and 5 min after intubation (take the average of three measurements at each stage).
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