A Comparative Study of Eleveld and Schnider Pharmacokinetic Models for Target-Controlled Infusion of Propofol in Sedation of Mechanically Ventilated ICU Patients

Hacettepe University84 enrolled

Overview

This prospective observational study aims to compare the clinical performance of two target-controlled infusion (TCI) models, Eleveld and Schnider, for propofol sedation in mechanically ventilated intensive care unit (ICU) patients. The study evaluates sedation depth, hemodynamic stability, and recovery profiles using the Bispectral Index (BIS) and Riker Sedation-Agitation Scale. Secondary outcomes include awakening time, total propofol dose, and incidence of delirium after sedation withdrawal. The findings may help identify the most reliable pharmacokinetic model for safe and effective ICU sedation.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Intensive Care Unit Sedation Sedation Target Controlled Infusion of Propofol

Interventions

propofol

Propofol will be administered via a target-controlled infusion (TCI) system for sedation of mechanically ventilated ICU patients. Two pharmacokinetic models, Eleveld and Schnider, will be used to guide the infusion. Sedation depth will be titrated to achieve a Riker Sedation-Agitation Scale score between 3 and 4 and a Bispectral Index (BIS) value of 60-80. Hemodynamic parameters, total propofol dose, awakening time, and incidence of delirium will be recorded for comparison between models. No other sedative or hypnotic agents will be used during the study period.

TCI Propofol InjectionDEVICE

Propofol will be administered intravenously via a target-controlled infusion (TCI) system for sedation of mechanically ventilated intensive care unit (ICU) patients. The infusion will be guided by two different pharmacokinetic models - Eleveld and Schnider - assigned to respective patient groups. The TCI device automatically adjusts infusion rates to maintain target effect-site concentrations according to each model. Sedation depth will be titrated to maintain a Riker Sedation-Agitation Scale score of 3-4 and a Bispectral Index (BIS) value between 60 and 80. Hemodynamic variables, awakening time, and delirium incidence will be evaluated to compare clinical performance between the two models.

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: Age over 18 years, Classified as ASA (American Society of Anesthesiologists physical status) class I-IV, Being monitored in the Anesthesiology and Reanimation Intensive Care Unit of Hacettepe University Faculty of Medicine Hospital, Availability of necessary data (medical history, laboratory results, etc.) for analysis, Hemodynamic stability - Exclusion Criteria:Patients who refused to participate in the study or did not provide legal consent, Patients with an ASA (American Society of Anesthesiologists physical status) classification greater than IV, Transition to an alternative sedation method during the study, Contraindication to propofol infusion (e.g., propofol anaphylaxis, lipid metabolism disorders), Patients whose sedation level could not be clinically assessed due to neurological or neurodegenerative diseases, Patients expected to require sedation for more than 72 hours (to reduce the risk of propofol infusion syndrome) \-

Outcomes

Primary Outcomes

Accuracy of Sedation Depth Control Measured by BIS Values

Comparison of the accuracy and stability of target-controlled infusion (TCI) sedation between the Eleveld and Schnider pharmacokinetic models in mechanically ventilated ICU patients. Sedation depth will be assessed by Bispectral Index (BIS) monitoring and maintained between 60 and 80. The mean absolute deviation of BIS from target range will be calculated to evaluate model performance

Time frame: During the sedation period (up to 72 hours)

Accuracy of Sedation Depth Control Measured by BIS Values

Time frame: During the sedation period (up to 72 hours)

Secondary Outcomes

Proportion of Time Within Target Sedation Range (Riker Score 3-4)

Percentage of total sedation time during which patients remained within the target Riker Sedation-Agitation Scale (SAS) range of 3-4, comparing the Eleveld and Schnider TCI propofol models.

Time frame: During the sedation period (up to 72 hours)

A Comparative Study of Eleveld and Schnider Pharmacokinetic Models for Target-Controlled Infusion of Propofol in Sedation of Mechanically Ventilated ICU Patients

Overview

Conditions

Interventions

Eligibility

Locations (1)

Outcomes

Primary Outcomes

Secondary Outcomes

Central Contacts