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Exploration of Appropriate BIS Range and Propofol Effect-site Concentration During Total Intravenous Anesthesia With Concomitant Adjuvants.

26 juillet 2026 mis à jour par: Ma Ye, China-Japan Friendship Hospital

A Prospective, Randomized Study to Determine the Appropriate Bispectral Index Range and Propofol Effect-Site Concentration During Total Intravenous Anesthesia Combined With Midazolam, Dexmedetomidine or Esketamine.

The goal of this clinical trial is to determine the appropriate Bispectral Index (BIS) range and propofol effect-site concentration required to maintain adequate anesthesia depth during total intravenous anesthesia (TIVA) combined with midazolam, dexmedetomidine, or esketamine in patients undergoing unilateral knee replacement surgery. The main questions it aims to answer are:

  1. What are the appropriate BIS range and propofol effect-site concentration for maintaining adequate anesthesia depth when combined with each of the three medications (midazolam, dexmedetomidine, or esketamine) during TIVA?
  2. How these combination regimens affect the quality of recovery and postoperative pain in patients?

Participants will:

  1. Receive one of four anesthesia regimens during surgery: propofol alone, propofol combined with midazolam, dexmedetomidine, or esketamine.
  2. Undergo a stepwise reduction of propofol effect-site concentration towards the end of surgery.
  3. Have their consciousness assessed using the isolated forearm technique, while BIS, EEG signals, and vital signs are continuously monitored throughout the procedure.
  4. Have their recovery quality and postoperative pain assessed after surgery.

Aperçu de l'étude

Statut

Pas encore de recrutement

Les conditions

Intervention / Traitement

Type d'étude

Interventionnel

Inscription (Estimé)

100

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Adulte
  • Adulte plus âgé

Accepte les volontaires sains

Non

La description

Inclusion Criteria:

  • Age 18 to 65 years
  • American Society of Anesthesiologists (ASA) physical status I or II
  • Body Mass Index (BMI) 18 to 30 kg/m²
  • Scheduled for elective unilateral total knee replacement surgery
  • Willing to participate in the study and signed informed consent form, and able to comply with the intervention and assessment procedures

Exclusion Criteria:

  • History of neurological disorders
  • Cognitive dysfunction assessed by the Mini-Cog scale
  • History of antipsychotic or sedative medication use in the past 4 weeks
  • Poorly controlled or untreated hypertension
  • Sinus bradycardia, cardiac conduction block, or severe heart failure
  • Acute angle-closure glaucoma
  • Allergic to intravenous anesthetics
  • Hearing impairment, could not cooperate in intervention and evaluation
  • Contraindications to tourniquet use on the upper arm

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: La prévention
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation parallèle
  • Masquage: Seul

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Comparateur factice: Propofol + Remifentanil
Participants in this arm will receive total intravenous anesthesia (TIVA) with propofol and remifentanil during the maintenance period. After placement of the knee prosthesis, the isolated forearm technique (IFT) will be initiated. Participants will wear headphones playing recorded standardized instructions. Rocuronium (0.3 mg/kg) will be administered via the non-dominant arm. The propofol plasma-site concentration will be reduced in stepwise decrements of 0.3 μg/mL, with each concentration maintained for 5 minutes, until any of the following endpoints is reached: (1) positive IFT response , (2) BIS > 60 sustained for 1 minute, (3) electroencephalogram signs of arousal, or (4) clinical judgment by the anesthesiologist that anesthesia depth is inadequate.
Expérimental: Propofol + Remifentanil + Midazolam
Participants in this arm will receive total intravenous anesthesia (TIVA) with propofol and remifentanil during the maintenance period. After placement of the knee prosthesis, the isolated forearm technique (IFT) will be initiated. Participants will wear headphones playing recorded standardized instructions. Rocuronium (0.3 mg/kg) will be administered via the non-dominant arm. Midazolam (2 mg) will be administered intravenously.The propofol plasma-site concentration will be set to 1.8 μg/mL, then reduced in stepwise decrements of 0.3 μg/mL, with each concentration maintained for 5 minutes, until any of the following endpoints is reached: (1) positive IFT response , (2) BIS > 60 sustained for 1 minute, (3) electroencephalogram signs of arousal, or (4) clinical judgment by the anesthesiologist that anesthesia depth is inadequate.
Expérimental: Propofol + Remifentanil + Dexmedetomidine
Participants in this arm will receive total intravenous anesthesia (TIVA) with propofol and remifentanil during the maintenance period. After placement of the knee prosthesis, the isolated forearm technique (IFT) will be initiated. Participants will wear headphones playing recorded standardized instructions. Rocuronium (0.3 mg/kg) will be administered via the non-dominant arm. Dexmedetomidine 1 μg/kg infused over 10 minutes.The propofol plasma-site concentration will be set to 1.8 μg/mL, then reduced in stepwise decrements of 0.3 μg/mL, with each concentration maintained for 5 minutes, until any of the following endpoints is reached: (1) positive IFT response , (2) BIS > 60 sustained for 1 minute, (3) electroencephalogram signs of arousal, or (4) clinical judgment by the anesthesiologist that anesthesia depth is inadequate.
Expérimental: Propofol + Remifentanil + Esketamine
Participants in this arm will receive total intravenous anesthesia (TIVA) with propofol and remifentanil during the maintenance period. After placement of the knee prosthesis, the isolated forearm technique (IFT) will be initiated. Participants will wear headphones playing recorded standardized instructions. Rocuronium (0.3 mg/kg) will be administered via the non-dominant arm. Esketamine (0.3 mg/kg) will be administered intravenously.The propofol plasma-site concentration will be set to 1.8 μg/mL, then reduced in stepwise decrements of 0.3 μg/mL, with each concentration maintained for 5 minutes, until any of the following endpoints is reached: (1) positive IFT response , (2) BIS > 75 sustained for 1 minute, (3) electroencephalogram signs of arousal, or (4) clinical judgment by the anesthesiologist that anesthesia depth is inadequate.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
BIS value
Délai: From the start of the intra-operative stepwise reduction phase until the first occurrence of IFT positivity or any predefined clinical sign of inadequate anesthesia, assessed up to 30 minutes.
BIS value recorded at the first occurrence of IFT positivity or any predefined clinical sign of inadequate anesthesia.
From the start of the intra-operative stepwise reduction phase until the first occurrence of IFT positivity or any predefined clinical sign of inadequate anesthesia, assessed up to 30 minutes.
Propofol Effect-Site Concentration
Délai: From the start of the intra-operative stepwise reduction phase until the first occurrence of IFT positivity or any predefined clinical sign of inadequate anesthesia, assessed up to 30 minutes.
Propofol effect-site concentration recorded at the first occurrence of IFT positivity or any predefined clinical sign of inadequate anesthesia.
From the start of the intra-operative stepwise reduction phase until the first occurrence of IFT positivity or any predefined clinical sign of inadequate anesthesia, assessed up to 30 minutes.

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Modified Brice Questionnaire
Délai: From PACU admission to 48 hours postoperatively. Assessed before PACU discharge, 24 hours and 48 hours postoperatively.
The presence of intra-operative awareness with recall is assessed using the Modified Brice Questionnaire. The questionnaire explores the patient's memory of the peri-operative period through structured questions.
From PACU admission to 48 hours postoperatively. Assessed before PACU discharge, 24 hours and 48 hours postoperatively.
Time from Discontinuation of Anesthetics to Laryngeal Mask Airway Removal
Délai: From discontinuation of anesthetics to LMA removal, assessed up to 60 minutes.
From discontinuation of anesthetics to LMA removal. Successful removal is defined as the patient being awake, able to open mouth on command, and having return of protective reflexes, without signs of respiratory distress.
From discontinuation of anesthetics to LMA removal, assessed up to 60 minutes.
Time to Modified Aldrete Score of 10 in the Post Anesthesia Care Unit
Délai: From PACU admission to Modified Aldrete Score of 10, assessed up to 60 minutes.
Time from post anesthesia care unit (PACU) admission until the first attainment of a Modified Aldrete Score of 10. The Modified Aldrete Score assesses five domains: consciousness, activity, respiration, blood pressure, and oxygen saturation, each scored from 0 to 2, with a maximum total score of 10. A score of 10 indicates the patient has achieved optimal recovery in all five domains.
From PACU admission to Modified Aldrete Score of 10, assessed up to 60 minutes.
Adverse Events During Emergence from Anesthesia
Délai: From discontinuation of anesthetics to PACU discharge, assessed up to 2 hours.
Adverse events during the period from anesthetic discontinuation to PACU discharge are recorded.
From discontinuation of anesthetics to PACU discharge, assessed up to 2 hours.
Postoperative Pain Intensity Measured by Numeric Rating Scale
Délai: From PACU admission to 48 hours postoperatively. Assessed at PACU admission, PACU discharge, 24 hours and 48 hours postoperatively.
Pain intensity is assessed using the Numeric Rating Scale, an 11-point scale from 0 to 10, where 0 represents "no pain" and 10 represents "the worst imaginable pain". Patients are asked to rate their current pain intensity at each assessment time point. The Numeric Rating Scale is a widely used and validated measure for postoperative pain assessment.
From PACU admission to 48 hours postoperatively. Assessed at PACU admission, PACU discharge, 24 hours and 48 hours postoperatively.
Analgesic Consumption
Délai: From PACU admission to 48 hours postoperatively. Recorded during PACU stay, 24 hours and 48 hours postoperatively.
Total amount of rescue analgesic medication administered to the patient from PACU admission to 48 hours postoperatively.
From PACU admission to 48 hours postoperatively. Recorded during PACU stay, 24 hours and 48 hours postoperatively.

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

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Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

1 août 2026

Achèvement primaire (Estimé)

31 janvier 2027

Achèvement de l'étude (Estimé)

31 juillet 2027

Dates d'inscription aux études

Première soumission

16 juillet 2026

Première soumission répondant aux critères de contrôle qualité

26 juillet 2026

Première publication (Réel)

30 juillet 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

30 juillet 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

26 juillet 2026

Dernière vérification

1 juillet 2026

Plus d'information

Termes liés à cette étude

Autres numéros d'identification d'étude

  • 2026-HX-39

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

NON

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .