Pancreatic malignancies are the second highest incident gastrointestinal malignancy in Canada. From cancer mortality statistics in 2014, there were 4,700 new cases of pancreatic malignancies second only to colorectal cancer, representing 2.4% of all cancers . Even with chemotherapy, the median survival for patients with pancreatic adenocarcinoma is 6 to 10 months. Few of the patients are diagnosed at a resectable stage (12%-20%) so many patients are candidates for palliation only.In this context, one of the most important symptoms is pain because it often affects both quality of life and survival.70 to 80 % of patients with Pancreatic cancer had abdominal pain at the time of diagnosis . Adequate pain control is therefore an essential component of care in these patients. In the initial phase, the pain is visceral, but with disease progression, somatic pain may occur, especially due to the peripancreatic invasion of neural structures or muscles. Standard analgesics such as Acetaminophen are ineffective and administration of opioids is frequently limited by side effects such as nausea, constipation, somnolence, addiction, confusion or respiratory depression, and failure in achieving adequate analgesia. In these situations, neurodestructive methods of celiac plexus with Absolute Alcohol associated to Bupivacaine involving the main pancreatic pain pathways, seem efficient. Alcohol causes the immediate precipitation of endoneural lipoproteins and mucoproteins within the celiac plexus, leading to the extraction of cholesterol and phospholipids from the neural membrane. To prevent severe transient pain after the procedure, Bupivacaine was injected before the Alcohol injection. Interest and importance of EUS-CPN is well established (safe, more effective than percutaneous or CT guided celiac plexus Neurolysis, significant reduction in pain and significant reduction of narcotics requirements) however the role and effect of Bupivacaine on the effectiveness of Neurolysis and lytic power of Alcohol has never been studied . Is it a synergistic effect ? Or an antagonistic effect by diluting Alcohol ? The Centre hospitalier de l'université de Montréal (CHUM) is currently the busiest EUS center in the world and has the largest experience with EUS-guided CPN. The CHUM also probably see more pancreatic cancers annually than any other center (more than 300 proven cases/year). There are no published reports of serious adverse events associated with this procedure and this has been the investigators experience as well. Patients may however experience some mild to moderate discomfort during the initial injection of the absolute ethanol solution, but this is usually short lived (less than 30 minutes in our experience). Therefore, Bupivacaine is currently injected before the Ethanol injection, however, local anesthetic was not used before the Phenol injection for example because it has been reported that Phenol has an immediate local anesthetic effect.

The investigators believe that, Bupivacaine has no effect and instead it dilutes the alcohol and then reduces the lytic power of Ethanol. This study was designed to test this hypothesis prospectively.

The goal of this project is to determine if EUS-CPN without Bupivacaine (versus EUS-CPN with Bupivacaine) can reduce pain scores and improve quality of life in patients with inoperable pancreatic cancer by reducing the morbidity due to narcotic side effects (e.g. nausea, excessive sedation, constipation).