An overview of Primary Biliary Cholangitis

Primary biliary cholangitis is a liver disease that affects the bile ducts that run through your liver. It slowly degrades those bile ducts, making it harder for bile to flow through. Bile backs up inside your liver, which damages the tissues. Scar tissue gradually replaces healthy tissue and your liver gradually loses its functionality. This is known as cirrhosis. PBC was formerly known as primary biliary cirrhosis.

Primary biliary cholangitis is a chronic and progressive condition, which means it doesn’t go away and can get worse over time. It progresses slowly through several stages. At the beginning, you might not notice it at all. But in the end, it can cause liver failure, which is fatal without a liver transplant. Fortunately, medication helps slow the progress of the disease, and not everyone will reach this stage.Primary biliary cholangitis is a chronic and progressive condition, which means it doesn’t go away and can get worse over time. It progresses slowly through several stages. At the beginning, you might not notice it at all. But in the end, it can cause liver failure, which is fatal without a liver transplant. Fortunately, medication helps slow the progress of the disease, and not everyone will reach this stage.

In PBC, it appears that your own immune system attacks the cells lining your intrahepatic bile ducts, causing inflammation. It’s as if your immune system mistakes these cells for foreign invaders. This is called autoimmune disease. Your immune system acts automatically to destroy healthy cells without any apparent reason, or any regulation telling it when to stop. Chronic inflammation leads to scarring.

We don’t know why autoimmune disease occurs. There does appear to be a genetic factor. People who get autoimmune diseases often have a family history of autoimmune diseases, and they often get more than one type. There also seems to be an environmental factor, meaning that it may take something in your environment to trigger the disease. It may be a chemical or infection that you’re exposed to.

Many people with PBC have no symptoms in the early stages. As the disease progresses, signs of biliary disease begin to appear. The earliest and most common symptoms of people with PBC are:

1. Fatigue (65%).

2. Itchy skin (55%).

These symptoms affect different people to different degrees. They can occur later or earlier in the course of your disease, and they can be mild to severe at any stage. How your symptoms present doesn’t seem to be related to how advanced your disease is. However, some research has suggested that more severe symptoms earlier on may predict a faster progression overall.

Your healthcare provider will ask about your medical history and symptoms and physically examine you. Then they’ll test a sample of your blood for evidence of PBC. They look for particular antibodies in your blood that are associated with PBC, especially one called antimitochondrial antibody (AMA). They also look for elevated liver enzymes that indicate liver stress, especially alkaline phosphatase.

If your test results are positive for PBC, your provider will want to look at images of your liver and biliary system next. This helps to rule out other possible causes of your symptoms, and can also help show how advanced the disease is. They’ll usually begin with a simple test like an abdominal ultrasound. But sometimes, they may need to take clearer images with some type of MRI (magnetic resonance imaging).

About 5% of people with PBC test negative for AMA but have other signs and symptoms. In this case, your provider may need to take a liver biopsy to confirm you have PBC. They can usually do this as a bedside procedure using a needle inserted into your liver. The needle will withdraw a tiny tissue sample, and your provider will send the sample to a lab for examination under a microscope.

Providers use the following treatments for primary biliary cholangitis:

Medication

There’s no cure for PBC, but you can slow it down and improve your condition with medication. Ursodeoxycholic acid (UDCA) is a type of bile salt that can help clear bile from your liver and reduce liver damage. It works well for about half of people with PBC, especially in the early stages. For those who don’t benefit from UDCA, doctors sometimes recommend a different bile salt called obeticholic acid.

Doctors can also treat some of your individual symptoms with different medications. For itching, they may recommend antihistamines such as diphenhydramine (Benadryl® or Aler-Dryl®), ultraviolet light therapy or bile acid sequestrants such as cholestyramine. Vitamin supplements can help prevent vitamin deficiencies and side effects such as osteoporosis. Some people with fatigue benefit from stimulants such as modafinil.

Surgery

If medication doesn’t improve your condition and your liver function continues to decline, your doctor may put you on the liver transplant waiting list. Liver transplant surgery has excellent results for people with PBC. Although, like other autoimmune diseases, PBC may return after your liver transplant, but it tends to progress much more slowly the second time around. Life expectancy after your transplant is normal.

Chronic inflammation degrades your body’s tissues over time. While temporary inflammation can be part of the normal healing process, constant inflammation causes overactive healing in the form of scarring. When your bile ducts are scarred, they become narrowed and distorted, which obstructs the flow of bile. Bile backs up into your liver, causing inflammation and eventually, scarring (cirrhosis).

You may not notice biliary disease in the early stages. But as it progresses, complications can begin to develop. Bile that can’t flow will begin to leak into your bloodstream, causing illness. Bile that can’t flow also can’t reach your digestive system, where it’s needed to aid digestion. In later stages, scar tissue in your liver begins to affect the blood vessels that pass through it, causing portal hypertension.

Fat malabsorption

When your digestive system lacks the bile it needs, it has trouble breaking down and absorbing fats. Fat malabsorption can cause:

1. High blood cholesterol.

2. Fat deposits under your skin.

3. Fatty poop or diarrhea.

4. Weight loss.

5. Low levels of fat-soluble vitamins A, D, E and K.

6. Osteoporosis (from failure to absorb fat-soluble vitamin D).

Portal hypertension

When scar tissue in your liver begins to obstruct the blood vessels that run through it, it causes portal hypertension — high blood pressure in those veins and the veins that branch off from them. Portal hypertension can lead to:

1. Enlarged liver.

2. Enlarged spleen.

3. More frequent colds and infections (reduced immunity).

4. Easy bleeding and bruising (thrombocytopenia).

5. Spider angiomas (red, spiderlike blood vessels under the surface of your skin).

6. Swollen veins (varices) in your esophagus and abdomen.

7. Gastrointestinal bleeding.

8. A buildup of fluid in your abdomen (ascites).

9. Swelling in your lower body (edema).

10. Occasional mental confusion (from the buildup of toxins in your blood).