The Effect of Obesity in Dexmedetomidine Metabolic Clearance

October 10, 2016 updated by: Pontificia Universidad Catolica de Chile
The purpose of this study is to study the effect of obesity in dexmedetomidine pharmacokinetics and pharmacodynamic profile.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

The investigators expect to find an inverse correlation between the amount of fat mass and liver blood flow or with the enzymatic metabolic capacity. Results will be based on a population pharmacokinetic modeling analysis performed in NONMEM program. The investigators will first account for the effect of different measured size scalars on volumes and clearances and then they will search for plausible covariates (liver blood flow, enzymatic capacity, degree of hepatic steatosis, etc) on dexmedetomidine metabolic clearance. A pharmacokinetic model capable of characterizing clearance changes in the obese using more plausible biological covariates will be tried to be defined.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
40

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • 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
    • Región metropolitana
      • Santiago, Región 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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 60 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria for obese patients:

  • American Society of Anesthesiology classification I-III patients.
  • Both genders.
  • Age between 18 - 60 years.
  • Body mass index higher than 40 Kg/m2.

Inclusion Criteria for non-obese patients:

  • American Society of Anesthesiology classification I-II patients
  • Both genders.
  • Age between 18 - 60 years
  • Body mass index lower than 30 Kg/m2.

Exclusion Criteria:

  • Known allergy to study drugs
  • Uncontrolled hypertension.
  • Heart block greater than first degree.
  • Chronic hepatic and kidney disease.
  • Patients taking any drug acting in the central nervous system within 24 hrs before surgery.
  • Patients taking drugs that induce overexpression of liver cytochrome P450-complex enzymes (Carbamazepine, Phenytoin, Phenobarbital, Rifampicin, Dexamethasone, Griseofulvin, Terbinafine, Prednisone, Hydrocortisone, Modafinil).)
  • Known addiction to illicit drugs.
  • Pregnancy.
  • Current or past oncologic disease.

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

  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Obese
Body composition measurement before surgery using Dual energy X-ray absorptiometry. Dexmedetomidine infusion during surgery. Venous blood sampling for dexmedetomidine plasmatic levels during and after surgery. Liver blood flow indirect non-invasive assessment after surgery using indocyanine. Liver biopsy during surgery.
Drug: Dexmedetomidine
Dexmedetomidine 0.5 μg/kg over 10 minutes and then, 0.5 mcg/kg/h throughout surgery.
Other Names:
  • Precedex
Experimental: Non-obese
Body composition measurement before surgery using Dual energy X-ray absorptiometry. Dexmedetomidine infusion during surgery. Venous blood sampling for dexmedetomidine plasmatic levels during and after surgery. Liver blood flow indirect non-invasive assessment after surgery using indocyanine. Liver biopsy during surgery.
Drug: Dexmedetomidine
Dexmedetomidine 0.5 μg/kg over 10 minutes and then, 0.5 mcg/kg/h throughout surgery.
Other Names:
  • Precedex

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Dexmedetomidine plasmatic levels
Time Frame: From start of infusion (min): 5, 10, 20, 30, 45, 60, 90, 120, 150, 180; from end of infusion (min): 5, 10, 20, 30, 60, 90, 120, 240, 360, 720
Measured by high performance liquid chromatography
From start of infusion (min): 5, 10, 20, 30, 45, 60, 90, 120, 150, 180; from end of infusion (min): 5, 10, 20, 30, 60, 90, 120, 240, 360, 720

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Steatohepatitis score
Time Frame: 3 months after liver biopsy specimen collection
Using liver biopsy, a score for steatohepatitis will be applied on samples from all patients
3 months after liver biopsy specimen collection
Plasma disappearance rate of indocyanine
Time Frame: 2 hours after arrival to Post-Anesthesia Care Unit
Using indocyanine green and LiMON monitor (Pulsion Medical Systems) surrogate measures of liver blood flow will be registered.
2 hours after arrival to Post-Anesthesia Care Unit
Enzyme expression
Time Frame: 3 months after liver biopsy specimen collection
Liver samples will be analyzed for UGT2B10 and UGT1A4 expression (involved in dexmedetomidine metabolization)
3 months after liver biopsy specimen collection
Hemodynamics
Time Frame: Recorded at every blood sample collection (5, 10, 20, 30, 45, 60, 90, 120, 150, 180 min) during anesthesia
Heart rate and arterial pressure will be recorded during anesthesia
Recorded at every blood sample collection (5, 10, 20, 30, 45, 60, 90, 120, 150, 180 min) during anesthesia
Anesthetic depth
Time Frame: Recorded at every blood sample collection (5, 10, 20, 30, 45, 60, 90, 120, 150, 180 min) during anesthesia
Using a bispectral index monitor, anesthetic depth will be monitorized through out surgery.
Recorded at every blood sample collection (5, 10, 20, 30, 45, 60, 90, 120, 150, 180 min) during anesthesia

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Pontificia Universidad Catolica de Chile

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Luis I Cortínez, MD, Associate Professor Ordinary Category

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

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
August 1, 2015

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 1, 2016

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 1, 2017

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
September 6, 2015

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 21, 2015

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
September 23, 2015

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
October 12, 2016

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 10, 2016

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
October 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 14-253
  • 1150197 (Other Grant/Funding Number: FONDECYT)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

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