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Primary biliary cirrhosis

Primary biliary cirrhosis is an autoimmune disease of the liver marked by the slow progressive destruction of the small bile ducts within the liver. When these ducts are damaged bile builds up in the liver (cholestasis) and over time damages the tissue. more...

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This can lead to scarring, fibrosis, cirrhosis, and ultimately liver failure. It is a rare disease, about 200 out of a million; 10 to 1 women to men, although different references vary widely on these numbers.

Signs and symptoms

The following signs may be present in PBC:

  • fatigue
  • pruritus (itchy skin)
  • jaundice (yellowing of the eyes and skin), due to increased bilirubin in the blood.
  • xanthelasmas (focal collections of cholesterol in the skin, especially around the eyes)
  • Complications of cirrhosis and portal hypertension:
    • fluid retention in the abdomen (ascites)
    • esophageal varices
    • hepatic encephalopathy, up to coma, in extreme cases.

Diagnosis

To diagnose PBC, distinctions should be established from other conditions with similar symptoms, such as autoimmune hepatitis or primary sclerosing cholangitis (PSC).

Diagnostic blood tests include:

  • deranged liver function tests (high alkaline phosphatase, elevated AST, ALT)
  • presence of certain antibodies: antimitochondrial antibody, antinuclear antibody (the M2-IgG antimitochondrial antibody is the most specific test)

Abdominal ultrasound or a CT scan is usually performed to distinguish between the various possible causes. Ideally, everyone suspected of PBC should have a liver biopsy, and - if uncertainty remains - endoscopic retrograde cholangiopancreatography (ERCP, an endoscopic investigation of the bile duct).

Etiology

The cause of the disease is unknown at this time, but research indicates that there is an immunological basis for the disease, making it an autoimmune disorder. Most of the patients (<90%) seem to have auto-mitochondrial antibodies (AMAs) against pyruvate dehydrogenase complex (PDC-E2), an enzyme that is found in the mitochondria.

Therapy

There is no known cure, but medication may slow the progression so that a normal lifespan and quality of life may be attainable. Ursodeoxycholic acid (Ursodiol) is one, which helps reduce the cholestasis. To relieve itching caused by bile acids in circulation, which would normally be removed by the liver, cholestyramine (a bile acid sequestrant) may be prescribed to absorb bile acids in the gut and be eliminated, rather than enter the blood stream. As in all liver diseases, alcoholic beverages are contraindicated. In advanced cases, a liver transplant, if successful, is said to have excellent prognosis.

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