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 Type
OBSERVATIONAL
Enrollment
21
Section for Surgical Pathophysiology, Rigshospitalet
Copenhagen, Denmark
Change in skin pain detection threshold before and during deep electrical pain stimulation.
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.
Time frame: 14 days
Test-retest of primary outcome
The primay and additional assesments are re-measured 14 days after the primary assemssment to allow evaluation of test-retest reliability.
Time frame: 14 days
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