Pain After Deep Electrical Stimulation in the Groin in Pain Free Subjects (HADES-1)

January 4, 2013 updated by: Eske Kvanner Aasvang, Rigshospitalet, Denmark

Hyperalgesia After Deep Electrical Stimulation in Pain Free Subjects

Sensory disturbances in persistent postherniotomy pain, include hyperalgesia from deeper structures as well as the skin. Whether this is one combined pain syndrome, where for instance deep pain leads to cutaneous hyperalgesia, or two isolated synchronous pain conditions, is unknown. By Giving pain free subjects an intense non-harmful electrical stimulation in deeper tissues in the groin and recording the skin sensory function, this hypothesis will be tested

Study Overview

Status

Completed

Conditions

Study Type

Observational

Enrollment (Actual)

21

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

  • Denmark
      • Copenhagen, Denmark, 2100
        • Section for Surgical Pathophysiology, Rigshospitalet

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 and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Male

Sampling Method

Non-Probability Sample

Study Population

Healthy young men.

Description

Inclusion Criteria:

  • male, age >18 yr, pain-free, caucasian

Exclusion Criteria:

  • previous groin surgery, groin hernia, sensory disturbaces, use of painmedication, drug or alcohol abuse.

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

  • Observational Models: Cohort
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort
1
1. Healthy, un-operated, groin-hernia free, pain-free and medicinal free males

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in skin pain detection threshold before and during deep electrical pain stimulation.
Time Frame: 14 days

Heat pain detection threshold by use of a Thermotester (Somedic AS Sweden) is assessed before and during deep electrical pain stimulation (6 of 10 point on a NRS scale. Deep pain stimulation is performed by two needle electrodes, placed under ultrasound guidance, 5 mm apart in various tissue and locations in the groin:

  1. Musculus rectus abdominis dxt. ( 10 cm craniel to the external inguinal ring) - Subcutaneous, and muscular stimulation.
  2. Spina iliaca anterior superior dxt. ( 2 cm lateral to the ilica spine) - subcutaneous, m obliquus externus and nervns ilioinguinalis stimulation.
  3. External inguinal ring - subcutaneous and funicle stimulation.
14 days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Test-retest of primary outcome
Time Frame: 14 days
The primay and additional assesments are re-measured 14 days after the primary assemssment to allow evaluation of test-retest reliability.
14 days

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
deep electrical and pain detection thresholds
Time Frame: 14 days

The detection- and pain detection thresholds to electrical stimulation will be assessed. An up-n-down staircase stimulation of single oulses of 0.04 mSeconds with increasing mA from 0.1 to a maximum of 60 mA is used. A total of 10 thresholds is recorded in the following locations.

Musculus rectus abdominis dxt. ( 10 cm craniel to the external inguinal ring) - Subcutaneous, and muscular stimulation.

Spina iliaca anterior superior dxt. ( 2 cm lateral to the ilica spine) - subcutaneous, m obliquus externus and nervns ilioinguinalis stimulation.

External inguinal ring - subcutaneous and funicle stimulation. Musculus rectus abdominis sin. ( 10 cm craniel to the external inguinal ring) - Subcutaneous, and muscular stimulation.
14 days
warmth and mechanical detection and pain detection thresholds
Time Frame: 14 days
warmth and mechanical detection and pain detection thresholds are recorded in the right and left groin and right lower arm. A total of 10 repated mesures for each parameter is recorded.
14 days

Collaborators and Investigators

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

Sponsor

Rigshospitalet, Denmark

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

June 1, 2012

Primary Completion (Actual)

December 1, 2012

Study Completion (Actual)

January 1, 2013

Study Registration Dates

First Submitted

October 3, 2012

First Submitted That Met QC Criteria

October 3, 2012

First Posted (Estimate)

October 5, 2012

Study Record Updates

Last Update Posted (Estimate)

January 7, 2013

Last Update Submitted That Met QC Criteria

January 4, 2013

Last Verified

January 1, 2013

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • H-1-2012-035

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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