Effect of Age on the Median Effective Concentration(EC50) for Motor Block With Spinal Plain Bupivacaine

October 23, 2015 updated by: Mingquan Chen, China Three Gorges University, Yichang, China
This study was performed in 131 adult patients undergoing transurethral, urological or lower limb surgery under combined spinal and epidural anesthesia. Patients were stratified according to age: 20-30, 31-40, 41-50, 51-60, 61-70, and 71-80 years. The spinal component of the anesthetic was established by bolus administration of up-and-down doses of 0.75% plain bupivacaine, determined by Dixon's method. The degree of motor block after intrathecal administration of each concentration was evaluated by the modified Bromage and Hip motor function score. The EC50 were estimated from the up-and-down sequences using the method of Dixon and Massey and logistic regression. Other endpoints were included on the basis of sensory block level, duration of motor blockade, hypotension, and vasopressor requirements.

Study Overview

Status

Withdrawn

Conditions

Study Type

Observational

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
    • Hubei
      • Yichang, Hubei, China, 443000
        • China Three Gorges University

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 80 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

This study was performed in 131 adult patients undergoing transurethral, urological or lower limb surgery under combined spinal and epidural anesthesia.

Description

Inclusion Criteria:

- ASA physical status I-II adult patients who were undergoing transurethral, urological or lower limb surgery, primarily under the spinal component of established combined epidural-spinal anesthesia, with the epidural component to be used if there was a need for intra-operative analgesic supplementation or for postoperative analgesia.

Exclusion Criteria:

  • Patients with diabetes, obesity, neuromuscular diseases, bleeding diathesis, hypersensitivity to amide local anesthetics, lumbar vertebrae abnormality, chronic back pain, or who were pregnant were excluded from this study

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

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
the median effect concentration of bupivacaine
Time Frame: The endpoint was determined according to the degree of motor power in any lower limb (according to the modified Bromage scale and the Hip motor function scale) within 5 minutes after intrathecal administration of the tested bupivacaine concentration
The endpoint was determined according to the degree of motor power in any lower limb (according to the modified Bromage scale and the Hip motor function scale) within 5 minutes after intrathecal administration of the tested bupivacaine concentration
The endpoint was determined according to the degree of motor power in any lower limb (according to the modified Bromage scale and the Hip motor function scale) within 5 minutes after intrathecal administration of the tested bupivacaine concentration
sensory block level
Time Frame: 20 minutes
the sensory level was assessed by the pinprick or ice at interval 5 minutes and 2 0minutes after injection of spinal bupivacaine.
20 minutes

Collaborators and Investigators

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

Sponsor

China Three Gorges University, Yichang, China

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.

Helpful Links

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

January 1, 2013

Primary Completion (Anticipated)

January 1, 2015

Study Completion (Anticipated)

January 1, 2015

Study Registration Dates

First Submitted

May 13, 2014

First Submitted That Met QC Criteria

May 19, 2014

First Posted (Estimate)

May 20, 2014

Study Record Updates

Last Update Posted (Estimate)

October 27, 2015

Last Update Submitted That Met QC Criteria

October 23, 2015

Last Verified

October 1, 2015

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • China Three Gorges University (China Three Gorges University)

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.

Clinical Trials on Mononeuropathy of the Median Nerve, Mild

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Algeria

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe