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Propofol Effect-Site Target Controlled Infusion in the Obese: Characterization of the Time Profile of Bispectral Index Response

This study has been completed.
Information provided by (Responsible Party):
Pablo Sepulveda, Universidad del Desarrollo Identifier:
First received: August 9, 2012
Last updated: August 14, 2012
Last verified: August 2012
The aim of this study is to characterize the Pharmacokinetic/Pharmacodynamic relationship of a single bolus dose of propofol in obese patients and to extract a time to peak effect (t-peak) from the estimated model parameters.

Condition Intervention Phase
Drug: Propofol
Phase 4

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Supportive Care
Official Title: Propofol Effect-Site Target Controlled Infusion in the Obese: Characterization of the Time Profile of Bispectral Index Response.

Resource links provided by NLM:

Further study details as provided by Universidad del Desarrollo:

Primary Outcome Measures:
  • Profile of Pharmacokinetic and Pharmacodynamic of an induction bolus dose of propofol in obese patients. [ Time Frame: 1, 2, 3, 5, 7 and 10 minutes after the initial bolus dose or until BIS > 75 ]

    Pharmacokinetic parameters (V1, V2, V3, CL, Q)

    Pharmacodynamic parameters (E0, Emax, C50, Gamma, t1/2Ke0, T peak )

Enrollment: 14
Study Start Date: April 2011
Study Completion Date: November 2011
Primary Completion Date: November 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Propofol
14 obese patients(IMC>35 kg m-2) scheduled for laparoscopic bariatric surgery
Drug: Propofol
Propofol was administered by plasma TCI and a bolus dose was given by setting the initial plasma target between 12-16 μg/ml according to the anesthesiologist criteria. The protocol target range was selected based on previous experience using this model in the obese. After the patients reached this target, propofol infusion was stopped until the patients woke up (BIS>75). No other drugs were given during this period. Facemask ventilation was assisted only if necessary to maintain SpO2 > 90%. BIS data and propofol infusion data were automatically recorded every five seconds using the AnestFusor© program. Arterial blood samples of 4 ml for propofol assays were collected at 1, 2, 3, 5, 7 and 10 minutes after the initial bolus dose or until BIS > 75. After the patient woke up the study was considered finished and propofol infusion was restarted according to the anesthesiologist plan.

Detailed Description:

Target controlled infusion (TCI) is a technique to administer intravenous drugs that allows rapid achievement and maintenance of predetermined drug concentrations, either in plasma (Cp) or at the site of effect (Ce).

To characterize the time profile of propofol effect an additional parameter, the equilibration half time between plasma and effect site (T1/2keo) needs to be incorporated in the pharmacokinetic (PK) model.


Ages Eligible for Study:   20 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • IMC > 35 kg m-2
  • Scheduled for laparoscopic bariatric surgery
  • ASA I-II patients
  • Between 20 and 60 yr of age.

Exclusion Criteria:

  • Patients with allergy to study drugs
  • Uncontrolled hypertension
  • Heart block greater than first degree
  • Take any drug acting in the central nervous system
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Please refer to this study by its identifier: NCT01665079

Clinica Alemana
Santiago, Chile
Sponsors and Collaborators
Universidad del Desarrollo
Principal Investigator: Pablo O Sepúlveda, MD Clinica Alemana Universidad del Desarrollo
  More Information

Responsible Party: Pablo Sepulveda, Profesor Asociado Anestesiología, Universidad del Desarrollo Identifier: NCT01665079     History of Changes
Other Study ID Numbers: Propofol TCI obese
Study First Received: August 9, 2012
Last Updated: August 14, 2012

Keywords provided by Universidad del Desarrollo:
anaesthetics iv

Additional relevant MeSH terms:
Hypnotics and Sedatives
Central Nervous System Depressants
Physiological Effects of Drugs
Anesthetics, Intravenous
Anesthetics, General
Anesthetics processed this record on April 28, 2017