What is biliary atresia?
Biliary atresia is a rare liver disease that occurs in infants. It is often found shortly after birth. The disorder affects tubes in the liver called bile ducts. If not treated with surgery, it can be fatal.
Bile is a fluid made by the liver. Normally the bile ducts take bile to the small intestine. Bile helps with digestion and also carries waste products. When a child has biliary atresia, the bile ducts in the liver are blocked. Bile becomes backed up in the liver. This damages the liver. Many vital body functions also are affected.
There are two types of biliary atresia:
- Perinatal biliary atresia. This is the most common type. It appears after birth, most often when a baby is about 2 to 4 weeks old.
- Fetal biliary atresia. This is less common. It appears while a baby is still developing in the mother’s womb.
Biliary atresia must be treated with surgery. It is the most common cause of liver transplants in children in the U.S. It is more common in girls than in boys.
What causes biliary atresia?
Experts don’t know what causes biliary atresia. It is not passed down from parent to child, so it is not an inherited disease.
Researchers are looking at possible causes, such as:
- Viral or bacterial infections
- Immune system problems
- A permanent change in a gene’s structure, called a genetic mutation
- Exposure to toxins
Who is at risk for biliary atresia?Premature babies are at greater risk for biliary atresia than full-term infants. Asian and African-American babies are also at greater risk for the disorder.
What are the symptoms of biliary atresia?
Babies with biliary atresia usually seem healthy at birth. Most often, symptoms start to occur between 2 weeks and 2 months of life. Symptoms may include:
- Yellowish skin and eyes (jaundice)
- Dark urine
- Light-colored stools
- Swollen belly (abdomen)
- Weight loss
Symptoms of biliary atresia may look like other liver conditions or health problems. Always see your child's healthcare provider for a diagnosis.
How is biliary atresia diagnosed?
Your child’s healthcare provider will give your child an exam and take a health history. The provider may also do several tests. These may include the following.
- Liver enzymes. High levels of liver enzymes can alert healthcare providers to liver damage or injury. That’s because the enzymes leak from the liver into the bloodstream when the liver is damaged.
- Bilirubin. Bilirubin is made by the liver and is sent out into bile. High levels of bilirubin often mean that bile flow is blocked. Or it could mean there is a defect in the processing of bile by the liver.
- Albumin and total protein. Below-normal levels of proteins made by the liver are linked to many long-term (chronic) liver disorders.
- Clotting studies. These include PT (prothrombin time) and PTT (partial thromboplastin time). These tests check how long it takes for blood to clot. Blood clotting requires vitamin K and proteins made by the liver. Liver cell damage and blocked bile flow can both cause problems with normal blood clotting.
- Viral studies, including hepatitis and HIV. These check for viruses in the bloodstream.
- Blood culture. This checks for bacterial infection in the bloodstream that can affect the liver.
- Abdominal ultrasound. A diagnostic imaging test that uses high-frequency sound waves and a computer to make images of blood vessels, tissues, and organs. Ultrasounds are used to see the liver, gallbladder, and bile ducts.
- HIDA or hepatobiliary scan. A low-level radioactive isotope is injected into your child's vein. The liver and intestine are scanned by a nuclear medicine machine. If the isotope passes through the liver into the intestine, the bile ducts are open and the child does not have biliary atresia.
- Liver biopsy. A tissue sample is taken from your child's liver and checked for any problems. A biopsy can tell if biliary atresia is likely. It may also rule out other liver problems.
- Diagnostic surgery. The surgeon can see the liver and bile ducts by making a cut or incision in your child’s belly or abdomen. If biliary atresia is diagnosed, the surgeon may treat it with surgery at the same time.
How is biliary atresia treated?
Without surgery, biliary atresia can be fatal. Two types of surgery are used to treat this condition. Your child's healthcare provider can help decide which surgery would be a good choice:
This surgery connects the bile drainage from the liver directly to the intestinal tract. It goes around (bypasses) the blocked bile ducts. This surgery can allow a child to grow and be in fairly good health for a few years. At some point, bile will back up into the liver. This causes liver damage. A liver transplant may also be needed over time.
A liver transplant removes the damaged liver and replaces it with a new liver from a donor. The new liver can be one of the following:
- A whole liver, received from a donor who has died
- Part of a liver, received from a donor who has died
- Part of a liver, received from a relative or other person whose tissue type matches the child's tissue type
After a liver transplant, the new liver begins working and the child's health often gets better quickly.
After a transplant, a child must take medicines to help prevent the body’s immune system from attacking, or rejecting, the new liver. These medicines are called antirejection medicines. Rejection is part of the immune system’s normal way of fighting against viruses, tumors, and other foreign substances. Antirejection medicines weaken the immune system’s response.
It’s important to have regular contact with your child’s healthcare provider and members of the transplant team after a liver transplant.
What are the complications of biliary atresia?Biliary atresia causes liver damage and affects many processes that allow the body to work normally. Without surgery, the disease can be fatal.
Living with biliary atresia
Before your child has surgery, nutrition may be a problem. With biliary atresia, not enough bile reaches the intestine to help digest fats in the diet. Liver damage can cause a lack of protein and a lack of vitamins. Children with liver disease need more calories than a normal child because they have a faster metabolism.
Your child’s healthcare provider may recommend that your child see a pediatric nutritionist. The nutritionist can advise you on your child's diet. A nutritional plan may include a balanced diet and added vitamins, as directed your child’s healthcare provider.
Some children with liver disease become too sick to eat normally. If this is the case, your child’s provider may also recommend that you give high-calorie liquid feedings. These feedings are given through a tube called an NG, or nasogastric tube. The tube is guided into your child’s nose, down the esophagus, and into the stomach. A high-calorie liquid can be given through the tube to add to your child's diet if your child can only eat small amounts of food. Or it can replace meals if your child is too sick to eat.
After surgery, your child's digestion may go back to normal. Or you may still need to give your child extra vitamins or work with your child's diet. Talk with your child's healthcare provider for recommendations.
Many factors affect how well children with biliary atresia do over time. These factors include:
- How much damage occurred to the bile ducts
- At what age the child had either a Kasai procedure or liver transplant
- How much liver damage has occurred
- The child’s overall health
After a liver transplant, your child's health will typically improve. But your child must follow a strict medical routine. This includes taking:
- Medicines to prevent the body’s immune system from attacking, or rejecting, the new liver. These are called antirejection medicines. They weaken the immune system’s response.
- Medicines to prevent infection, called antibiotics
It is important to work closely with your child's healthcare providers.
When should I call my child's healthcare provider?
Call your child’s healthcare provider right away if you see that your child has any of the following:
- Yellowish skin and eyes (jaundice)
- Very dark, almost brown-colored urine
- Pale, almost white stools
- Lack of weight gain
Also call your child’s healthcare provider to ask what symptoms you should look for if your child:
- Has been diagnosed with biliary atresia
- Has had surgery to correct the disorder
Key points about biliary atresia
- Biliary atresia is a rare liver disorder that occurs in babies.
- Experts don’t know what causes the disease.
- If not treated with surgery, biliary atresia can be fatal.
- At some point, your child may need a liver transplant.
- After a liver transplant, your child must take medicines to stop the body from attacking, or rejecting, the new liver.
Next stepsTips to help you get the most from a visit to your child’s health care provider:
- Before your visit, write down questions you want answered.
- At the visit, write down the names of new medicines, treatments, or tests, and any new instructions your provider gives you for your child.
- If your child has a follow-up appointment, write down the date, time, and purpose for that visit.
- Know how you can contact your child’s provider after office hours. This is important if your child becomes ill and you have questions or need advice.