Middle-aged Woman With Severe Generalized Itchiness and Fatigability
What's Your Diagnosis?
ANSWER: PRIMARY BILIARY CIRRHOSIS
BILIARY CIRRHOSIS: AN OVERVIEW
Biliary cirrhosis is an autoimmune liver disorder that generally results from injury to or prolonged obstruction of either the intrahepatic or extrahepatic biliary system. It also may be caused by impaired biliary excretion or destruction of small intrahepatic bile ducts and canals of Hering with progressive fibrosis.1,2
PBC is characterized by chronic inflammation as well as fibrous obliteration of the intrahepatic bile ducts; the disease is progressive and can lead to liver damage and ultimately liver failure. In contrast, secondary biliary cirrhosis is defined as prolonged obstruction of the larger extrahepatic ducts. PBC affects all races, although it is most common in whites.3 The prevalence ranges from 19 to 240 cases per million.4 The female to male ratio is 10 to 1.3 Ninety percent of affected women are between 35 and 60 years of age.2
Although the precise cause is unknown, both environmental and genetic factors may play a role in the pathogenesis of PBC.5 The condition is associated with autoimmune disorders such as the CREST syndrome (calcinosis, Raynaud phenomenon, esophageal dysmotility, sclerodactyly, and telangiectasia), Sjögren syndrome, autoimmune thyroiditis, rheumatoid arthritis, pernicious anemia, type 1 diabetes mellitus, type 1 renal tubular acidosis, and IgA deficiency. PBC has also been reported as an extraintestinal manifestation of celiac disease.4
IgG AMA is detected in more than 90% of patients with PBC.2 These antibodies are directed against the pyruvate dehydrogenase and 2-oxo-acid enzymes in the mitochondria. In addition, a number of class II major histocompatibility loci, including DR8, have been observed in patients with PBC.
About 40% of patients are asymptomatic at the time of diagnosis. Pruritus and fatigue are the usual presenting symptoms. Pruritus can be generalized or isolated to the palms and soles2; typically the onset is insidious. The severity of fatigue is independent of the extent of the hepatic disease. Some patients may have anorexia, nausea, and right upper quadrant abdominal pain.
As the disease progresses, jaundice develops. Affected patients may have hepatomegaly, splenomegaly, hyperpigmentation, and clubbing of the fingers. Steatorrhea and malabsorption of lipid-soluble vitamins may occur because of deficiency of bile salts in the intestine and pancreatic exocrine inefficiency.6 Subcutaneous deposition of lipoprotein around the eyes (xanthelasma palpebrarum) and over joints and tendons (xanthoma) (Figure) may also occur. Other clinical features include bone tenderness, glossitis, dermatitis, ascites, and ecchymosis.2
Blood cell counts are usually normal in the early stages of the disease.2 PBC is typically diagnosed at a presymptomatic stage based on the results of a routine liver biochemistry screening that show marked elevation of serum ALP (usually 3 to 4 times the upper limit of normal), ALT, aspartate aminotransferase (AST), and gamma-glutamyl transpeptidase. The diagnosis can be confirmed by the detection of AMA in the serum; this test is fairly specific and sensitive.6
Patients with PBC commonly have elevated levels of serum bile acid and serum IgM. Hypoalbuminemia, hyperbilirubinemia, and a prolonged prothrombin time/international normalized ratio are associated with poor prognosis. Tests for rheumatoid factor, anti–smooth muscle antibodies, antinuclear antibodies, and thyroid antibodies may be positive. An elevated antitransglutaminase antibody titer indicates associated celiac disease.
A cholestatic pattern of liver disease and markedly elevated cholesterol levels are hallmark features of PBC on laboratory blood work. The serum cholesterol level is high in more than half of patients and may even exceed 1003.86 mg/dL.7,8 LDL and very low-density lipoprotein levels are typically only mildly elevated, whereas high-density lipoprotein (HDL) levels are markedly increased.9
The differential diagnosis of PBC is shown in Table 1.2 Ultrasonography of the abdomen may help exclude extrahepatic obstruction. Liver biopsy helps establish the diagnosis and determine the stage of disease (Table 2). Serum bilirubin levels can be used to monitor disease progression.2
Malabsorption of fat-soluble vitamins is a common complication. Osteomalacia may result from decreased vitamin D absorption. This may predispose affected patients, especially postmenopausal women, to osteoporosis.2 Patients with a high level of fatigue may become emotionally stressed and depressed.10
Hepatic encephalopathy and complications from portal hypertension, including variceal hemorrhage, ascites, and hepatorenal syndrome, may occur.11 Hepatocellular carcinoma is more common in men and rare in women.
Despite the strikingly elevated cholesterol levels in patients with PBC, the risk of atherosclerotic death is not increased.12 High HDL levels may be protective against atherosclerotic disease in these patients.
Management of PBC is mainly symptomatic. Ursodiol or ursodeoxycholic acid (UDCA) promotes secretion of endogenous bile acids and decreases cytokine production. It is used to lower serum levels of ALP, ALT, and AST and to alleviate pruritus.13 UDCA is most effective in patients with early disease.14 Side effects include diarrhea and rashes.
It remains unclear whether UDCA delays disease progression. Studies suggest no mortality benefit or reduction in liver transplantation with UDCA.15,16 Patients with advanced PBC and complications of portal hypertension do not benefit from UDCA and should be considered for liver transplantation. Recurrence of PBC after liver transplantation is uncommon.
Cholestyramine, an oral bile salt-sequestering resin, can be used to reduce the intensity of pruritus and the degree of hypercholesterolemia.2 Plasmapheresis may be considered in patients with refractory pruritus.
Steatorrhea may be reduced with a low-fat diet. Supplementation with fat-soluble vitamins (vitamins A, D, E, and K) should also be given.
Periodic screening for osteomalacia and osteoporosis with bone densitometry is important in patients
who have PBC. Patients with osteoporosis may possibly benefit from vitamin D, calcium supplements, and bisphosphonate therapy.2 ■
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