Minimally Invasive Techniques for Pain Relief
By the time most patients receive a diagnosis of pancreatic cancer, their disease may be too advanced to be treated surgically. Pain is a frequent and debilitating symptom for these patients. Although the exact reason remains poorly understood, it is thought that the pain may be caused when pancreatic cancer cells invade a cluster of nerves in the abdomen known as the celiac plexus. A procedure known as neurolytic celiac plexus block (NCPB), which involves injecting a local anesthetic to disrupt pain signals from the celiac plexus, has been shown to significantly reduce pain and improve mood and life expectancy for patients with advanced pancreatic cancer.
Traditionally, NCPB has been performed percutaneously (using a needle) by injecting the anesthetic directly into the celiac plexus with x-ray guidance. However, this procedure has been associated with side effects such as muscle and limb weakness. Memorial Sloan-Kettering physicians have recently shown that by performing this procedure laparoscopically -- using a specially designed instrument called a laparoscope that can be inserted through small incisions in the abdomen -- a patient's pain can be reduced without incurring substantial side effects. The laparoscopic NCPB is performed at the time of operative staging -- a diagnostic procedure in which surgeons use a laparoscope to view the pancreas and surrounding organs to determine the extent of the disease. This 20-minute laparoscopic procedure allows surgeons to obtain an excellent view of the celiac plexus at the time of staging laparoscopy. As a result, our surgeons feel that this approach should be at least as effective as the percutaneous approach with fewer potential side effects.
Alternatively, NCPB can be performed under the guidance of endoscopic ultrasound (EUS), in which a small probe is inserted through the mouth and into the stomach to obtain a detailed view of the celiac plexus. During this procedure, a local anesthetic can be injected directly into the celiac plexus. As with the laparoscopic approach, endoscopic NCPB is felt to be at least as effective as the percutaneous approach, with fewer potential side effects.