What Are the Types of Bile Ducts?
Bile ducts found in the liver are separated into two kinds. Intrahepatic ducts are found inside of the liver. They are a collection of smaller tubes that collect and transport bile to the extrahepatic ducts.
There are two extrahepatic ducts outside of the liver, one on the right and one on the left. These two ducts combine to form the common hepatic duct, which runs into the small intestine after passing through the pancreas. The biliary duct is the bile duct that emerges from the gallbladder and opens into the common hepatic duct, after which it is called the choledochal or common bile duct.
Prevalence of Biliary Obstruction
Biliary obstruction is a relatively uncommon issue, occurring in five out of every 1,000 people. Sex-factors for biliary obstruction depend highly on the underlying cause of the issue, the most common of which is gallstone disease. Women are much more likely to suffer from gallstones than men. By age 60, nearly 25 percent of women will have developed gallstones, increasing to as many as 50 percent of women by age 75. Only 20 percent of men aged 75 and up will suffer from gallstones. Researchers believe women are more susceptible to gallstones due to their elevated estrogen levels and its effect on the liver.
Causes, Risk Factors, and Symptoms of Bile Duct Obstruction
When bile ducts become obstructed, bile builds up in the liver causing jaundice in the patient. Jaundice is the term referring to yellowing of the skin.
Known causes of bile duct obstruction include:
- Gallstone disease
- Cysts in the common bile duct
- Enlarged lymph nodes in the porta hepatis (deep fissure in the liver)
- Inflammation of the bile ducts
- Narrowing of the bile ducts from scarring (biliary stricture)
- Injury from gallbladder surgery
- Tumors in the bile ducts or pancreas
- Tumors that have spread to the biliary system
- Liver and bile duct worms (flukes)
- Trauma to the liver, gallbladder, or pancreas
- Pancreatitis
- Cirrhosis of the liver (when healthy liver tissues are replaced by scar tissue)
- Severe liver damage
Risk factors for bile duct obstruction include:
- A history of gallstones
- Chronic pancreatitis
- Pancreatic cancer
- An injury to the right part of the abdomen
- Obesity
- Rapid weight loss
- Conditions related to the breakdown of red blood cells, such as sickle cell anemia
- Infections (more common in people with weaker immune systems)
Symptoms related to biliary obstruction are dependent on the underlying cause of the issue. Some common symptoms include light-colored stools, dark urine, jaundice, itching, pain in the upper right side of the abdomen, nausea, vomiting, weight loss, and fever.
How to Diagnose and Treat Bile Duct Obstruction
A physical exam is usually the first step in a bile duct obstruction diagnosis. Your doctor will examine you and feel your abdomen. A blood test may then be administered to test for increased levels of bilirubin (a catabolic compound involved in the elimination of waste), alkaline phosphatase (an enzyme related to liver disease), and liver enzymes. A blood test can also help rule out cholecystitis (inflammation of the gallbladder) and cholangitis (inflammation of the common bile duct).
Your doctor may also use any of the following imaging technologies to locate the blocked bile duct: abdominal ultrasound, abdominal CT scan, endoscopic retrograde cholangiopancreatography (ERCP), percutaneous transhepatic cholangiogram (PTCA), magnetic resonance cholangiopancreatography (MRCP), or endoscopic ultrasound (EUS).
Bile duct obstruction treatment is often targeted toward resolving the underlying cause of the issue, with the goal of removing the blockage through medication or surgery if necessary. If the cause is gallstone disease, a cholecystectomy may be administered to remove the gallstones. In cases where the obstruction is caused by a tumor, a stent may be placed in the blocked bile duct to restore normal flow.
Complications and Prevention of Biliary Obstruction
If the biliary obstruction is left untreated, it can lead to severe complications including liver diseases, scarring of the bile ducts, and acute cholangitis (infection in the bile duct). Vitamin deficiencies can also occur if the small intestine fails to receive the necessary amount of bile salts due to biliary obstruction.
Patients who undergo surgery to resolve the biliary obstruction face an additional set of potential complications. Postoperative acute oliguric renal failure (kidney failure) can occur but is more common in elderly patients who show signs of jaundice. Biliary colic or a gallbladder attack can also occur after surgery.
Diet and Herbal Remedies to Treat Bile Duct Blockage
When suffering from bile duct obstruction, it is recommended to follow a low-fat diet. Each individual’s tolerance and ability to digest fat is different—thus, the amount of fat each person should consume while on a low-fat diet for bile duct blockage is different for everyone. Generally, no more than 50 grams of fat should be consumed per day when on a low-fat diet.
Following the diet will involve consuming foods that are naturally low in fat or fat-free. This includes fruit, vegetables, beans, and grains prepared without sauces. Lean meats may be consumed as well as fat-free deli meats. Dairy should be limited to low-fat milk, yogurt, and cheese. Also, ensure that you prepare your meal without using additional fats. Frying should be avoided for baking, broiling, or steaming.
Certain herbal remedies are recommended to treat bile duct obstruction. Milk thistle extract can increase the flow of bile while decreasing the concentration of cholesterol. Milk thistle is not recommended for use with blood-thinning or cholesterol-lowering medications, however. Globe artichoke has been used for centuries to increase bile flow and reduce the formation of gallstones. If a bile duct has been completely blocked, globe artichoke is not suggested for use. Purslane is an edible weed known for positive digestive effects. The use of purslane has been shown to reverse the liver damage caused by bile duct obstruction.
Bile duct obstruction is a fairly uncommon issue, generally caused by a larger underlying medical problem such as gallbladder disease. Biliary obstruction is more common in women, potentially due to higher estrogen levels. There are several different types of bile ducts in the liver and gallbladder and biliary obstruction can occur in any of them. Biliary obstruction on its own is not often life-threatening, but if left untreated can lead to severe complications including liver diseases. Common symptoms of bile duct obstruction include pale stools, dark urine, jaundice, itching, pain in the upper right side of the abdomen, nausea, vomiting, weight loss, and fever. Diagnosis often requires a physical exam, blood tests, and imaging scans. Surgery may be required for treatment, but more often due to the underlying cause of the biliary obstruction than the bile duct blockage itself. There are certain natural remedies that can aid with bile duct obstruction, including milk thistle, globe artichoke, and purslane. Patients are advised to follow a low-fat diet to help restore bile flow.
Related: Enlarged bile duct: Causes, symptoms, and treatment