Ultrasound Guided Transversus Abdominis Plane (TAP) vs. Trigger Point Injection (TPI) for Abdominal Wall Pain

Therapuetic Areas:Musculoskeletal
Age Range:18 - Any
Start Date:January 2012
End Date:December 2019
Contact:Brenda K Anderson, RN

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Ultrasound Guided Transversus Abdominis Plane Block vs. Trigger Point Injection for Abdominal Wall Pain: A Randomized Comparative Trial

Patients with chronic abdominal pain- with a component of abdominal wall pain- are often
treated with trigger point injections. This study will help to determine if a block within
the transversus abdominis plane (TAP) will provide superior analgesic benefit to a trigger
point injection as therapy for these patients.

Only patients referred to the Pain Clinic for abdominal trigger point injections for
abdominal wall pain will be considered for study recruitment.

Following informed consent, patients will complete a baseline questionnaire in the Pain
Clinic which gathers basic demographic data, pain scores and functional scores. Patients will
be randomized to receive either a TAP injection or a TPI. Because the TAP injection involves
a larger area to be anesthetized, a larger volume of medication will be used.

Thirty minutes after the injection, a sensory exam will be performed on the patient to
determine the level of block. At one week, one month, three months and six months after the
injection, a staff member will telephone the patient to assess how they are doing. The call
will take approximately 10 minutes and will consist of relaying a pain score as well as daily
functioning and sleep questions.

Subjects are responsible for all clinical costs associated with the injection.

There is no remuneration offered for study participation.

Inclusion Criteria:

Only patients referred to Pain Clinic for a trigger point injection.

- Non-cancer pain greater than 3 months duration.

- Unilateral abdominal pain.

- Positive Carnett's sign (A test in which acute abdominal pain remains unchanged or
increases when the muscles of the abdominal wall are tensed.)

- An identifiable abdominal trigger point.

Exclusion Criteria:

- History of chronic psychotic disorder.

- History of dementing illness.

- Active abdominal visceral disease as a known contributor of the pain.

- Abdominal surgery in the past 6 months.

- More than one trigger point.

- Abdominal wall hernias.

- BMI>40.
We found this trial at
200 First Street SW
Rochester, Minnesota 55905
Principal Investigator: Susan M Moeschler, MD
Phone: 507-255-8724
Mayo Clinic Rochester Mayo Clinic is a nonprofit worldwide leader in medical care, research and...
Rochester, MN
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