Primary biliary cholangitis (PBC)
Primary biliary cholangitis is a disease of largely unknown etiology. Its autoimmune origin is most frequently suggested, as evidenced by the frequent combination of PBC with other autoimmune disorders. In some cases, drug-induced triggers may play a role.
The main disease mechanism (pathogenesis) involves the progressive destruction of small intrahepatic bile ducts. This leads to the development of the primary clinical syndrome: cholestasis.
Clinical presentation of PBC:
- Early manifestations: pruritus often becomes the first sign. It can be extremely severe and, importantly for diagnosis, typically significantly precedes the appearance of visible skin yellowing.
- Late manifestations: jaundice eventually develops, acquiring a specific greenish tint as the disease progresses.
- Skin changes: lipid metabolism disorders lead to xanthomatosis (cholesterol deposits as nodules on the palms, buttocks, and legs) and xanthelasma (cholesterol plaques on the eyelids).
- Organ involvement: hepatomegaly (enlarged liver) is almost always objectively detected, while splenomegaly (enlarged spleen) joins in the later stages.
The disease can lead to fatal hemorrhages or severe liver failure.
Complications of cholestasis syndrome in PBC
Prolonged impairment of bile secretion inevitably affects gastrointestinal function and metabolism. Due to reduced bile entry into the intestinal lumen, fat emulsification and absorption are disrupted (malabsorption).
Consequences of malabsorption:
- Progressive weight loss in the patient.
- Pronounced deficiency of fat-soluble vitamins (A, D, E, K), as they cannot be absorbed without adequate amounts of fat.
- Bone changes: due to vitamin D deficiency and subsequent calcium deficiency, late musculoskeletal complications develop — osteomalacia (softening of the bones) and osteoporosis.
Diagnosis of primary biliary cholangitis
Confirming a PBC diagnosis requires a comprehensive approach, including laboratory tests and instrumental studies aimed at ruling out other causes of jaundice.
Laboratory markers:
- Complete blood chemistry: reflects the presence of cholestasis and cytolysis syndromes. Elevated levels of alkaline phosphatase (ALP), gamma-glutamyl transferase (GGT), direct bilirubin, and cholesterol are observed. Aminotransferase activity, and particularly GGT, may be increased 2–10 times.
- Immunological assays: detection of antimitochondrial antibodies (AMA) is the most specific and characteristic sign of the primary form of the disease.
Instrumental diagnostics: The main goal of instrumental methods is to rule out secondary biliary cirrhosis and extrahepatic (obstructive) jaundice. To assess the state of the ducts, the major duodenal papilla, and the head of the pancreas, EGD, abdominal ultrasound, and direct visualization methods of the biliary tract are used: ERCP (endoscopic retrograde cholangiopancreatography) and percutaneous transhepatic cholangiography.
Secondary biliary cirrhosis
Unlike the primary form, secondary biliary cirrhosis has a clearly established cause. Its etiology is associated with prolonged extrahepatic obstruction of the biliary tract—that is, impaired bile outflow at the level of the large bile ducts.
Risk factors for development:
- Cholelithiasis (including calculous cholecystitis and choledocholithiasis).
- Iatrogenic injuries (e.g., strictures formed after biliary surgeries).
- Congenital anatomical defects of the biliary system.
Symptoms of secondary cirrhosis: The clinical picture is often defined by exacerbations in the form of ascending cholangitis. Patients complain of epigastric pain accompanied by fever and blood test abnormalities (leukocytosis). Physical examination reveals hepatomegaly; in some cases, the physician can palpate an enlarged gallbladder. The condition carries a high risk of septic shock.
In the late stages of secondary biliary cirrhosis, patients develop ascites and pronounced signs of portal hypertension.
Briefly: answers to topical questions
Accumulation of which substances in the skin causes severe pruritus in primary biliary cholangitis?
Severe pruritus in primary biliary cholangitis is caused by the accumulation of bile acid salts and pruritogens.
An additional mechanism is hyperbilirubinemia, which accompanies cholestasis syndrome in hepatobiliary pathologies.
What histological (morphological) stages are distinguished in the development of primary biliary cholangitis?
The morphogenesis of primary biliary cholangitis traditionally includes four stages:
- Stage I (ductal) — non-suppurative destructive cholangitis of interlobular and septal bile ducts with lymphocytic, plasmacytic, and eosinophilic infiltration of portal tracts; possible granuloma formation around damaged ducts.
- Stage II (ductular) — proliferation of small bile ducts (ductules), spread of inflammatory infiltrate beyond portal tracts, incipient ductopenia.
- Stage III (fibrotic) — progressive portal and periportal fibrosis, portoportal septum formation, increasing ductopenia, copper accumulation in hepatocytes due to cholestasis.
- Stage IV (cirrhotic) — formation of true regenerative cirrhotic nodules surrounded by broad fibrous septa; bile ducts are absent in a significant portion of portal tracts.
To easily remember the fat-soluble vitamins whose deficiency occurs in cholestasis due to fat malabsorption, use the acronym DEKA (vitamins D, E, K, A).
Class and exam questions
Which clinical symptom appears first in primary biliary cholangitis?
Pruritus is the earliest manifestation. It is often severe and occurs long before visible jaundice appears.
What is the main cause of secondary biliary cirrhosis?
The secondary form develops as a result of prolonged mechanical obstruction of the large bile ducts. This can be caused by gallstones, congenital defects, or postoperative strictures.
Which antibodies should be tested in the blood to confirm PBC?
A characteristic immunological marker of primary biliary cholangitis is the detection of antimitochondrial antibodies (AMA).
Why do osteoporosis and osteomalacia develop in biliary cirrhosis?
Due to a lack of bile in the intestine, the absorption of fats and fat-soluble vitamin D is impaired. This leads to calcium deficiency and subsequent bone destruction.
What else to study on this topic
- Mechanisms of autoimmune destruction of intrahepatic ducts
- Pathogenesis of xanthomas and xanthelasmas in cholestasis
- Differential diagnosis of types of mechanical (extrahepatic) jaundice
- ERCP technique and indications for the procedure
- Clinical manifestations of portal hypertension in late-stage cirrhosis
Master the entire topic in the "Propaedeutics" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on «Biliary liver cirrhosis» and 3,152 more subject pages
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 113 video lessons on the subject
Other topics in the section "Liver, Biliary Tract, and Spleen"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.