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

Unknown

Conditions

Intervention / Treatment

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

Interventional

Enrollment (Anticipated)

90

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

  • China
    • Guangdong
      • Guangzhou, Guangdong, China, 510010
        • Guangzhou Military Region General Hospital, Department of Anesthesiology
        • Contact:
        • Principal Investigator:
          • Yun Bi Chen

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

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

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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
Intervention / Treatment
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

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

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

Guangzhou General Hospital of Guangzhou Military Command

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

June 1, 2016

Primary Completion (Anticipated)

September 1, 2016

Study Completion (Anticipated)

October 1, 2016

Study Registration Dates

First Submitted

May 11, 2016

First Submitted That Met QC Criteria

May 11, 2016

First Posted (Estimate)

May 16, 2016

Study Record Updates

Last Update Posted (Estimate)

June 17, 2016

Last Update Submitted That Met QC Criteria

June 16, 2016

Last Verified

June 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID 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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