Validation of a Pharmacokinetic Pharmacodynamic Model to Administer Propofol in Obese Patients

May 10, 2012 updated by: Ignacio Cortínez F., Pontificia Universidad Catolica de Chile

The purpose of this study is to validate an integrated pharmacokinetic-pharmacodynamic model to administer propofol in obese patients.

Our hypothesis is that pharmacokinetic and pharmacodynamic changes occur with increasing weight and that mathematical models to administer drugs in obese patients can be developed to accurately predict dose schemes in this population.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Propofol is the most frequently used IV anesthetic today. Propofol TCI is commonly used for induction and maintenance of general anaesthesia in obese and non obese patients. However, current propofol PK models, used in TCI devices, were derived from studies that did not include obese patients. A controversial issue for propofol dose adjustment in this population has been the selection of an adequate size descriptor to scale PK parameters, as drug administration based on total body weight can result in overdose, and conversely, administration based on ideal body weight can result in a sub-therapeutic dose. In a previous study from our group, we developed a PK model capable of characterizing the influence of obesity on propofol disposition. The purpose of this study is to validate this model to administer propofol in obese patients.

Study Type

Interventional

Enrollment (Actual)

20

Phase

  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Chile
    • Region Metropolitana
      • Santiago, Region Metropolitana, Chile
        • Hospital Clinico Pontificia Universidad Catolica

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 60 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • IMC > 35 kg m-2
  • Scheduled for laparoscopic bariatric surgery
  • ASA I-II patients
  • Between 18 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 within 24 hrs before surgery.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Supportive Care
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Propofol
20 obese patients(IMC>35 kg m-2) scheduled for laparoscopic bariatric surgery.
Drug: Propofol
General anesthesia will be induced administering propofol by effect site TCI system using our previously derived model, the target plasma concentration initially will be set at 4 mcg/ml. After loss of consciousness, rocuronium 0.6mg/kg, and remifentanil 0.2mcg/kg/min will be given to facilitate tracheal intubation. After intubation propofol target will be decreased to 3 for 10 minutes and then adapted to the needs of each patient to maintain stable BIS values between 40 and 50. At the end of surgery propofol infusion will be stopped, and patients will be transferred to the recovery unit extubated. Samples of 2.5 ml of arterial blood will be taken at 2, 5 and 10 min after every new target is set. Thereafter samples will be taken at 2, 5, 10, 15, 30, 60, 120 min after stopping drug infusion. Blood samples will be immediately centrifuged and then stored until analysis.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Validated pharmacokinetic-pharmacodynamic model of Propofol in Obese patients
Time Frame: During the intraoperative period and until 120 min after stopping propofol infusion
During the intraoperative period and until 120 min after stopping propofol infusion

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Pontificia Universidad Catolica de Chile

Investigators

  • Principal Investigator: Luis I Cortínez, MD, Departamento de Anestesiología, Hospital Clínico Pontificia Universidad Católica de Chile

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

March 1, 2012

Primary Completion (Actual)

April 1, 2012

Study Completion (Actual)

May 1, 2012

Study Registration Dates

First Submitted

May 8, 2012

First Submitted That Met QC Criteria

May 10, 2012

First Posted (Estimate)

May 11, 2012

Study Record Updates

Last Update Posted (Estimate)

May 11, 2012

Last Update Submitted That Met QC Criteria

May 10, 2012

Last Verified

May 1, 2012

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 11-142-Fondecyt-UC-2012

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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