The ED50 of DEX for Providing Sedation in Different Female Age Group

June 16, 2016 updated by: bo xu, Guangzhou General Hospital of Guangzhou Military Command
Dexmedetomidine(DEX) could provide dose-dependent sedation , analgesia , anti-anxiety and inhibition of sympathetic nerves and other effects. Because of its minimal impact on the respiratory , currently it was more and more widely used to sedate patients undergoing regional anesthesia.Many anesthetic pharmacokinetics and pharmacodynamics are often affected by age, and current studies with regard to the effects of age on dexmedetomidine pharmacodynamic are rare. This study was designed to explore the right DEX dose of different female Age of patients to produce suitable sedation.Dexmedetomidine be used in patients with combined spinal and epidural anesthesia for sedation,which is monitored by the Narcotrend,during the operation.The relation between Narcotrend index (NTI) and the depth of sedation for patients is also investigated.

Study Overview

Status

Status

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

Conditions

Conditions

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Intervention / Treatment

Intervention / Treatment

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Detailed Description

90 patients scheduled for combined spinal epidural spinal anesthesia were included in one of three groups. In each group,determination of median effective (ED50) doses was performed by the Dixon up-and-down method, an initial dose of 1.0 μg/kg dexmedetomidine, with dose adjustment intervals of 0.1 μg/kg in first three turning points and 0.05μg/kg in the last three turning points.Initial doses was 1.4μg/kg, .Sedative efficacy was defined as an OAA/S of ≤3,30 min after the beginning of drug administration.

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.
90

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

  • China
    • Guangdong
      • Guangzhou, Guangdong, China, 510010
        • Guangzhou Military Region General Hospital, Department of Anesthesiology

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

20 years to 79 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  1. ASA Ⅰ ~ Ⅱ patient undergoing lower extremity surgery
  2. Written informed consent from the patient or the relatives of the participating patient.
  3. BMI:18.0～25.0kg/m2

Exclusion Criteria:

  1. Mental illness can not match
  2. epidural anesthesia contraindicated
  3. People who have Slow-type arrhythmias
  4. People who were language or hearing impaired
  5. Sensory block reached to T8 or higher.
  6. People who had lung infection or sleep apnea syndrome.
  7. Pregnancy
  8. Chronic renal failure
  9. Alcohol or drug abuse

  10. Already taking gabapentin, pregabalin, benzodiazepin or antidepression drug

    -

    -

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: Treatment
  • 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: Youth female group
patients in the Youth female group, aged 20~35, were accepted an initial dose of 1.0 μg/kg dexmedetomidine, with dose adjustment intervals of 0.1μg/kg in first three turning points and 0.05μg/kg in the last three turning points.
Drug: Dexmedetomidine A
initial dose was 1.0 μg/kg dexmedetomidine, with dose adjustment intervals of 0.1μg/kg in first three turning points and 0.05μg/kg in the last three turning points.
Other Names:
  • Dexmedetomidne in youth female group
Experimental: Middle-aged female group
patients in the Middle-aged female group, aged 40~60, were accepted an initial dose of 1.0 μg/kg dexmedetomidine, with dose adjustment intervals of 0.1μg/kg in first three turning points and 0.05μg/kg in the last three turning points.
Drug: Dexmedetomidine B
initial dose was 1.0 μg/kg dexmedetomidine, with dose adjustment intervals of 0.1μg/kg in first three turning points and 0.05μg/kg in the last three turning points.
Other Names:
  • Dexmedetomiodine in middle-age female group
Experimental: Elderly female group
Patient in the elderly female group, aged 65~79, were accepted an initial dose of 1.0 μg/kg dexmedetomidine, with dose adjustment intervals of 0.1μg/kg in first three turning points and 0.05μg/kg in the last three turning points.
Drug: Dexmedetomidine C
initial dose was 1.0 μg/kg dexmedetomidine, with dose adjustment intervals of 0.1μg/kg in first three turning points and 0.05μg/kg in the last three turning points.
Other Names:
  • Dexmedetomidine in elderly female group

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
The ED50 of DEX for providing sedation
Time Frame: 30min after the start of the infusion
The aim of this study is to define the optimum bolus dose (ED50) of dexmedetomidine for producing adequate sedation during spinal anesthesia in different female age group using the Dixon and Mood up-and-down method。
30min after the start of the infusion

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
The ED95 of DEX
Time Frame: 30min after the start of the infusion
To determine the optimum bolus dose (ED95) of dexmedetomidine for producing adequate sedation during spinal anesthesia in different female age group.
30min after the start of the infusion

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.
Guangzhou General Hospital of Guangzhou Military Command

Study record dates

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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.
June 1, 2016

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.
September 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.
October 1, 2016

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).
May 11, 2016

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.
May 11, 2016

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.
May 16, 2016

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.
June 17, 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.
June 16, 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.
June 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.
  • DEX sedation

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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