Endoscopic Retrograde Cholangiopancreatography (ERCP)

ERCP stands for endoscopic retrograde cholangiopancreatography. A dye is injected into the bile and pancreatic ducts using a flexible, video endoscope. Then x-rays are taken to outline the bile ducts and pancreas.

The liver produces bile, which flows through the ducts, passes or fills the gallbladder and then enters the intestine (duodenum) just beyond the stomach. The pancreas, which is six to eight inches long, sits behind the stomach. This organ secretes digestive enzymes that flow into the intestine through the same opening as the bile. Both bile and enzymes are needed to digest food.

The flexible endoscope can be directed and moved around the many bends in the upper gastrointestinal tract. Electronic signals are then transmitted up the scope to the computer which then displays the image on a large video screen. An open channel in the scope allows other instruments to be passed through it to perform biopsies, inject solutions, or place stents.

The Procedure

An ERCP uses x-ray films and is performed in an x-ray theatre. The throat is anesthetized with a spray or solution, and the patient is usually mildly sedated. The endoscope is then gently inserted into the upper esophagus. The patient breathes easily throughout the exam, with gagging rarely occurring. A thin tube is inserted through the endoscope to the main bile duct entering the duodenum. Dye is then injected into this bile duct and/or the pancreatic duct and x-ray films are taken. The patient lies on their left side and then turns onto the stomach to allow complete visualisation of the ducts. If a gallstone is found, steps may be taken to remove it. If the duct has become narrowed, an incision can be made using electrocautery (electrical heat) to relieve the blockage. Additionally, it is possible to widen narrowed ducts and to place small tubing, called stents, in these areas to keep them open. The exam takes from 20 to 40 minutes, after which the patient is taken to the recovery area.

Benefits
An ERCP is performed primarily to identify and/or correct a problem in the bile ducts or pancreas. This means the test enables a diagnosis to be made upon which specific treatment can be given. If a gallstone is found during the exam, it can often be removed, eliminating the need for major surgery. If a blockage in the bile duct causes yellow jaundice or pain, it can be relieved.

Alternative Testing
Alternative tests to ERCP include certain types of x-rays (CAT scan, CT) and sonography (ultrasound) to visualise the pancreas and bile ducts. In addition, dye can be injected into the bile ducts by placing a needle through the skin and into the liver. Small tubing can then be threaded into the bile ducts. Study of the blood also can provide some indirect information about the ducts and pancreas.

Side Effects and Risks
A temporary, mild sore throat sometimes occurs after the exam. Serious risks with ERCP, however, are uncommon. One such risk is excessive bleeding, especially when electrocautery is used to open a blocked duct. In rare instances, a perforation or tear in the intestinal wall can occur. Inflammation of the pancreas also can develop.