What is biliary obstruction?
A biliary obstruction is a blockage of the bile ducts. The bile ducts carry bile from the liver and gallbladder through the pancreas to the duodenum, which is a part of the small intestine. Bile is a dark-green or yellowish-brown fluid secreted by the liver to digest fats. After you eat, the gallbladder releases bile to help in digestion and fat absorption. Bile also helps clear the liver of waste products.
Obstruction of any of these bile ducts is referred to as a biliary obstruction. Many of the conditions related to biliary obstructions can be treated successfully. However, if the blockage remains untreated for a long time, it can lead to life-threatening diseases of the liver.
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Types of bile ducts
You have several types of bile ducts. The two types of bile ducts in the liver are intrahepatic and extrahepatic ducts.Intrahepatic ducts: Intrahepatic ducts are a system of smaller tubes within the liver that collect and transport bile to the extrahepatic ducts. Extrahepatic ducts: The extrahepatic ducts begin as two parts, one on the right of the liver and the other on the left. As they descend from the liver, they unite to form the common hepatic duct. This runs directly toward the small intestine.
The biliary duct, or the duct from the gallbladder, also opens into the common hepatic duct. The bile duct from this point onward is known as the common bile duct or choledochus. Before emptying into the small intestine, the common bile duct passes through the pancreas.
What causes biliary obstruction?
A biliary obstruction may be caused by a number of factors involving the:bile ducts
The following are some of the most common causes of biliary obstruction:inflammation of the bile ductstraumaa biliary stricture, which is an abnormal narrowing of the ductan injury related to gallbladder or liver surgerytumors that have reached the liver, gallbladder, pancreas, or bile ductssevere liver damagecholedochal cyst (present in infants at birth)
What are the risk factors?
The risk factors for biliary obstruction usually depend on the cause of the obstruction. The majority of the cases are a result of gallstones. This makes women more vulnerable to developing a biliary obstruction. Other risk factors include:a history of gallstonesan injury to the right part of the abdomenrapid weight loss
What are the symptoms of biliary obstruction?
The symptoms of biliary obstruction can depend on the cause of the obstruction. People with biliary obstruction usually have:itchingpain in the upper right side of the abdomenfever
How is a biliary obstruction diagnosed?
Various tests are available for people who may have a biliary obstruction. Based on the cause of the obstruction, your doctor may recommend one or more of the following tests.
A blood test includes a complete blood count (CBC) and liver function test. Blood tests can usually rule out certain conditions, such as:cholangitis, which is an inflammation of the common bile ductan increased level of conjugated bilirubin, which is a waste product of the liveran increased level of liver enzymesan increased level of alkaline phosphatase
Any of these may indicate a loss of bile flow.
Ultrasonography is usually the first test performed on anyone suspected of a biliary obstruction. It allows your doctor to see the gallstones easily.
Biliary radionuclide scan (HIDA scan)
A hepatobiliary iminodiacetic acid scan, or HIDA scan, is also referred to as a biliary radionuclide scan. It uses radioactive material to provide valuable information about the gallbladder and any possible obstructions.
A cholangiography is an X-ray of the bile ducts.
An MRI scan provides detailed pictures of the liver, gallbladder, pancreas, and bile ducts.
Magnetic resonance cholangiopancreatography (MRCP)
Magnetic resonance cholangiopancreatography (MRCP) is used for the diagnosis of biliary obstructions and pancreatic disease.
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Endoscopic retrograde cholangiopancreatography (ERCP)
An endoscopic retrograde cholangiopancreatography (ERCP) involves the use of an endoscope and X-ray. It’s both a diagnostic and therapeutic tool. It allows your surgeon to see the bile ducts and it’s also used in treatment. This tool is particularly helpful because your doctor can use it to remove stones and take biopsy samples if necessary.