Efficacy of EUS-guided Celiac Plexus Blockade in Chronic Pancreatitis

Study Overview
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Brief Summary
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This is a triple-blind, parallel group, randomized controlled trial to assess the benefit of triamcinolone injection as a therapeutic measure for control of chronic pancreatitis pain. The treatment group will undergo EUS-CPB with bupivicaine plus triamcinolone (therapeutic block). There control group will undergo EUS-CPB with bupivicaine alone (diagnostic block).

Detailed Description
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There are few effective options for the treatment of abdominal pain in chronic pancreatitis. For the past 20 years, percutaneous injection of anesthetic agents into the celiac plexus (celiac plexus blockade or CPB) has been performed by pain anesthesiologists to diagnose the origin of pancreatic pain (visceral vs. non-visceral). Anesthetic blocks provide very short-term and variable pain relief. More recently, endoscopic ultrasound has been used to provide a transgastric approach to the celiac plexus (EUS-CPB). Corticosteroids may lengthen the effect of CPB to provide longer-lasting pain relief (therapeutic block). Case-series report that about 50% of patients experience partial or complete relief lasting an average of 1-2 months. Combined corticosteroid (triamcinolone) and anesthetic (bupivicaine) has now become standard practice for EUS-CPB. However, there have been no randomized controlled trials to prove that corticosteroid blocks are truly therapeutic (i.e. that they lengthen the effect of the typical diagnostic CPB with anesthetics). Randomized controlled trials are needed to demonstrate the therapeutic efficacy of CPB with corticosteroids. This is a triple-blind, parallel group, randomized controlled trial to assess the benefit of triamcinolone injection as a therapeutic measure for control of chronic pancreatitis pain. The treatment group will undergo EUS-CPB with bupivicaine plus triamcinolone (therapeutic block). There control group will undergo EUS-CPB with bupivicaine alone (diagnostic block). Eligible patients with abdominal pain undergoing EUS for the diagnosis of chronic pancreatitis or EUS-CPB for pancreatic pain will be recruited. Patients will complete a 2-week run-in period to establish baseline pain scores and opioid consumption. Following the run-in, EUS will be performed. If EUS reveals CP (>4 criteria), patients will be randomized to one of the two treatment groups. 74 patients will be randomized and followed for 2 months after the EUS-CPB. The primary endpoint is an improvement in the pain disability index (PDI) of greater than 10 points at 1 month. Secondary endpoints include opioid consumption, duration of pain relief, and quality of life (SF-12). If this trial shows that the addition of triamcinolone produces a long-lasting (1-month) benefit, then EUS-CPB can be more strongly advocated as a therapeutic option to patients with chronic pancreatitis. If triamcinolone does not produce a benefit over a diagnostic block, then EUS-CPB should be considered a primarily diagnostic measure for differentiation of visceral from non-visceral pain.

Official Title
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A Randomized, Triple-Blinded Study of Endoscopic Ultrasound Guided Celiac Plexus Blockade (EUS-CPB) With Bupivicaine and Triamcinolone vs. Bupivicaine Alone for the Treatment of Pain in Chronic Pancreatitis

Conditions
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Chronic Pancreatitis

Intervention / Treatment
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* Drug: Triamcinolone
* Drug: Bupivicaine alone


Participation Criteria
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Eligibility Criteria
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Inclusion criteria include: Age >18 yrs Ability for informed consent Chronic pancreatic-type abdominal pain (type B) (11). Exclusion criteria include: Pregnancy Malignancy Recent acute pancreatitis (within 2 months) Elevated INR (>1.5) or low platelet count (<75 cells/mm3) Allergy to eggs or caine anesthetics or corticosteroids; AND Becks depression score>20.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1<br>EUS guided celiac block with bupivicaine and triamcinolone. Patient will undergo endoscopic ultrasound and celiac plexus blockade using an EUS needle inserted into the celiac plexus. 20 cc of injectate will be administered. | Drug: Triamcinolone<br>* Injection of bupivacaine and triamcinolone<br>|
| Placebo Comparator: 2<br>EUS guided celiac block with bupivicaine only. Patient will undergo endoscopic ultrasound and celiac plexus blockade using an EUS needle inserted into the celiac plexus. 20 cc of injectate will be administered. | Drug: Bupivicaine alone<br>* Injection of bupivacaine<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Pain Disability Index | The Pain Disability Index (PDI) measures patients' responses of the extent to which pain limits their abilities to carry out everyday tasks. The index is scored from 0 (no limitation) to 70 (severe limitation). A decrease in score of 10 points or more is regarded as indicating significant improvement in the ability to carry out daily activities. | 1 month after block | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change From Baseline in Quality of Life Score at 1 Month - SF12 Physical Component | The SF12 survey measures patients' impressions of their level of health and well-being. The results are reported as two scores: A physical component and a mental component, each of which is reported on a scale of 0 (lowest level of health) to 100 (excellent health). Scores that increase from baseline indicate an improvement in patients' feelings of well-being. | 1 month |