AI-Assisted Blood Pressure Control During Anesthesia

Not Applicable

Not yet recruiting

• Conditions: General Anesthesia

• Registration Number: NCT07123675
• Lead Sponsor: Beijing Tsinghua Chang Gung Hospital

Brief Summary

This study is being done to see if a new computer-based tool can help anesthesiologists keep patients' anesthesia levels more stable during surgery.

Background: During general anesthesia, doctors carefully adjust medication doses to keep patients safely and comfortably unconscious. This requires constant attention. Researchers want to find out if a smart computer assistant can help with this task.

Purpose of the Study: The main goal is to compare two ways of managing anesthesia. One way is the standard method used by doctors today. The other way is having the doctor use suggestions from a new computer program designed to recommend medication doses in real-time. We want to see if using the computer tool can lead to more stable anesthesia, potentially using less medication and helping patients recover more smoothly.

Who Can Participate: The study will include adult patients who are scheduled to have surgery that requires general anesthesia.

What Will Happen in the Study: If you choose to join, you will be randomly assigned (like flipping a coin) to one of two groups:

Standard Care Group: Your anesthesiologist will manage your anesthesia medications based on their expert judgment and normal practice, as is done every day.

Computer-Assisted Group: Your anesthesiologist will also manage your anesthesia, but they will see suggestions from a computer system on a screen. The doctor will always have the final say and can choose to follow or ignore the computer's advice to ensure your safety.

In both groups, you will receive safe and complete anesthetic care. Your participation in the study will last for the duration of your surgery and the immediate recovery period. Researchers will look at information like the amount of medication used and how stable your anesthesia level was.

Detailed Description

Rationale: Precise control of anesthetic depth during general anesthesia is crucial for patient safety and optimal outcomes. Suboptimal dosing can lead to intraoperative awareness, hemodynamic instability, or excessive drug administration, which may delay recovery. This study will evaluate a novel reinforcement learning (RL) based clinical decision support system designed to provide real-time, personalized dosing recommendations for anesthetic agents.

Hypothesis: The use of an RL-based decision support system for guiding anesthetic drug administration results in a greater percentage of time within a target range of anesthetic depth compared to standard manual practice by anesthesiologists.

Study Design: This is a prospective, dual-center, parallel-group, randomized controlled superiority trial.

Objectives:

Primary Objective: To compare the percentage of case time that the Bispectral Index (BIS) is maintained within the target range of 40 to 60 between the RL-guided group and the standard care group.

Secondary Objectives: To compare total consumption of anesthetic agents (e.g., propofol and remifentanil), incidence and duration of intraoperative hypotension, time to tracheal extubation, and length of stay in the post-anesthesia care unit (PACU).

Interventions:

Intervention Group (RL-Guided): Anesthesiologists will manage general anesthesia with the aid of a real-time decision support system. The system, powered by a reinforcement learning algorithm, will display continuous dosing recommendations for propofol and remifentanil. The attending anesthesiologist retains full clinical autonomy and is responsible for all final dosing decisions.

Control Group (Standard Care): Anesthesiologists will manage general anesthesia according to their clinical experience and institutional standard of care, without input from the decision support system.

Study Population: Adult patients (aged 18-65 years), ASA physical status I-III, scheduled for elective surgery expected to last at least two hours under general anesthesia. Key exclusion criteria include known allergies to anesthetic agents, severe cardiovascular or respiratory disease, and emergency surgery.

Study Timeline

• Status Verified: 2025-08
• Study First Submitted: 2025-08-08
• Study First Submitted QC: 2025-08-08
• Last Update Submitted: 2025-08-08
• Study First Posted: 2025-08-14
• Last Update Posted: 2025-08-14
• Study Start: 2025-09-01
• Primary Completion: 2025-11-30
• Study Completion: 2025-12-15

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

• 1. Age range: 18 to 85 years. 2. Patients undergoing non-cardiac surgery. 3. Receiving intravenous-inhalation combined general anesthesia with tracheal intubation during surgery.

  2. Patients undergoing elective surgery. 5. Anesthesia maintenance plan includes:

  3. Propofol for continuous sedation during the maintenance phase;

  4. Remifentanil for continuous analgesia during the maintenance phase;

  5. Sevoflurane or desflurane for inhalation anesthesia. 6. ASA physical status I-IV. 7. Continuous monitoring of blood pressure, heart rate, and Bispectral Index (BIS) during surgery.

  6. Continuous invasive arterial blood pressure monitoring during surgery.

Exclusion Criteria

• 1. Emergency surgery. 2. Continuous infusion of remifentanil or propofol for less than 30 minutes during surgery.

  2. Receiving continuous intravenous sedatives other than propofol, or continuous infusion of intravenous sedatives other than propofol.

  3. Receiving continuous intravenous analgesics other than remifentanil, or continuous infusion of intravenous analgesics other than remifentanil.

  4. Inhaled anesthetic maintenance concentration is not equal to 0.5 Minimum Alveolar Concentration (MAC).

  5. Allergy to propofol or allergic reaction to remifentanil. 7. Severe obesity (BMI ≥ 35 kg/m²).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Mean Arterial Pressure Time in Range (MAP TIR)	From the induction of anesthesia until the end of the surgical procedure.	The percentage of time that the patient's Mean Arterial Pressure (MAP) is maintained within a pre-defined target range (e.g., 65-75 mmHg) during the surgical procedure. A higher percentage indicates more effective and stable blood pressure control.

Secondary Outcome Measures

Name	Time	Method
Variability of Mean Arterial Pressure (MAP)	From the induction of anesthesia until the end of the surgical procedure.	Calculated as the standard deviation of all MAP readings recorded during the surgical procedure. A lower value indicates more stable blood pressure.
Incidence of Intraoperative Adverse Events	From the induction of anesthesia until the end of the surgical procedure.	The number and percentage of patients experiencing pre-defined adverse events, such as severe hypotension (e.g., MAP \< 55 mmHg for more than 1 minute), severe hypertension, bradycardia, or tachycardia.
Total Consumption of Propofol	From the induction of anesthesia until the end of the surgical procedure.	The total dose of propofol administered, measured in milligrams (mg), normalized by patient weight and duration of anesthesia. A lower value may indicate higher anesthetic efficiency.
Total Consumption of Remifentanil	From the induction of anesthesia until the end of the surgical procedure.	The total dose of remifentanil administered, measured in micrograms (mcg), normalized by patient weight and duration of anesthesia. A lower value may indicate higher anesthetic efficiency.

Trial Locations

Locations (2)

Peking University People's Hospital; 🇨🇳 Beijing, Beijing, China

Beijing Tsinghua Changgung Hospital; 🇨🇳 Beijing, Beijing, China