The Effect of Propofol Induction Based on Lean Body Weight on the Depth of Anesthesia

Summary

Propofol has significant hemodynamic side effects. It is a lipophilic agent and is generally used at a dose of 2-2.5 mg/kg for induction. In patients with a body mass index (BMI) greater than 25, it can lead to serious complications. This patient group often has comorbidities such as hypertension, coronary artery disease, left ventricular hypertrophy, stroke, and obstructive sleep apnea.

Hemodynamic profile changes are influenced by both the rate of propofol administration and the total dose. Therefore, it is necessary to investigate the appropriate dose and infusion rate of propofol during anesthesia induction.

The primary aim of this study is to compare the effects of propofol induction doses, determined based on total body weight and lean body weight (calculated using tomography), on anesthesia depth using BIS and SedLine monitoring in patients with BMI \>25.

The secondary aim of the study is to compare propofol induction doses calculated using two different methods in terms of:

* Mean arterial pressure (MAP),
* Frequency of hypotension (MAP \<65),
* Frequency of Trendelenburg position or vasopressor requirement and their response,
* Tachycardia (heart rate \>100 bpm),
* Frequency of hypertension (SBP \>140). Additionally, the sensitivity and delay rates of BIS and SedLine monitoring in determining anesthesia depth were compared.

A total of 120 patients undergoing general anesthesia for urological surgeries at our hospital were included in the study. Patients were randomized into two groups (Group T/Group L). All patients were taken to the operating room, and in addition to routine monitoring, BIS and SedLine monitoring were provided. All patients received 1 mcg/kg of fentanyl.

* Group T received propofol at a dose of 2-2.5 mg/kg based on total body weight.
* Group L received propofol at a dose of 2-2.5 mg/kg based on lean body weight, which was calculated from CT imaging by a radiologist.
* Propofol was administered at a rate of 100 mg/min. The laryngeal mask will be placed once an adequate depth of anesthesia is achieved.

All data were recorded at 2-minute intervals for 6 minutes before and after induction. The collected data were statistically analyzed for comparison.

Conditions

• Propofol Adverse Reaction

Interventions

DRUG

T received propofol at a dose of 2-2.5 mg/kg based on total body weight

A total of 120 patients undergoing general anesthesia for urological surgeries at our hospital were included in the study. Patients were randomized into two groups (Group T/Group L). All patients were taken to the operating room, and in addition to routine monitoring, BIS and SedLine monitoring were provided. All patients received 1 mcg/kg of fentanyl. Group T received propofol at a dose of 2-2.5 mg/kg based on total body weight. Propofol was administered at a rate of 100 mg/min. The laryngeal mask will be placed once an adequate depth of anesthesia is achieved. All data were recorded at 2-minute intervals for 6 minutes before and after induction. The collected data were statistically analyzed for comparison.

DRUG

Group L received propofol at 2-2,5mg/kg dose based on le

A total of 120 patients undergoing general anesthesia for urological surgeries at our hospital were included in the study. Patients were randomized into two groups (Group T/Group L). All patients were taken to the operating room, and in addition to routine monitoring, BIS and SedLine monitoring were provided. All patients received 1 mcg/kg of fentanyl. Group L received propofol at 2-2,5mg/kg dose based on lean body weight, which was calculated from CT imaging by a radiologist. Propofol was administered at a rate of 100 mg/min. The laryngeal mask will be placed once an adequate depth of anesthesia is achieved. All data were recorded at 2-minute intervals for 6 minutes before and after induction. The collected data were statistically analyzed for comparison

Sponsors & Collaborators

• Ankara City Hospital Bilkent

  lead OTHER

Principal Investigators

• Seda Kurtbeyoğlu, doctor · Ankara City Hospital Bilkent

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

65 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2025-01-01

Primary Completion

2025-01-20

Completion

2025-01-27

Countries

• Turkey (Türkiye)

Study Locations