5.19
Cirrhosis I: Introduction
Cirrhosis is a chronic, irreversible liver disease characterized by the widespread replacement of healthy liver tissue with fibrotic scar tissue and t…
Cirrhosis develops when chronic liver injury results in scar tissue and nodules replacing healthy liver tissue. This distorts the liver’s structure and impairs its function.
This progressive damage can result from various causes, including chronic alcohol use, infection with hepatitis B and C, and nonalcoholic fatty liver disease.
Additionally, autoimmune liver diseases, such as autoimmune hepatitis, and inherited metabolic disorders, like Wilson disease, can also contribute to cirrhosis.
As the disease progresses, regenerative nodules form, encased by fibrous bands, causing structural changes that are classified morphologically into three types:
Micronodular cirrhosis is characterized by small, uniform nodules typically less than 3 millimeters in diameter.
Macronodular cirrhosis is defined by larger, irregularly shaped nodules separated by prominent bands of fibrous tissue.
In mixed cirrhosis, a combination of small and large nodules results in an uneven and irregular liver surface.
These structural alterations lead to compromised liver function and increased portal pressure.
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Q1: What causes cirrhosis to develop?
Cirrhosis develops from chronic liver injury that triggers progressive fibrosis and structural remodeling. Common causes include chronic alcohol use, hepatitis B and C infections, and nonalcoholic fatty liver disease. Other causes encompass autoimmune liver diseases like autoimmune hepatitis, inherited metabolic disorders such as Wilson disease, and prolonged exposure to hepatotoxic substances.
Q2: How does cirrhosis affect liver structure and function?
Cirrhosis replaces healthy liver tissue with fibrotic scar tissue and regenerative nodules, distorting the liver's normal architecture. These structural alterations lead to compromised liver function and increased portal pressure. The progressive damage impairs the liver's ability to perform its vital metabolic, synthetic, and detoxification roles.
Q3: What are the three morphological types of cirrhosis?
Micronodular cirrhosis features small, uniform nodules less than 3 millimeters in diameter, typically associated with alcoholic liver disease. Macronodular cirrhosis displays larger, irregularly shaped nodules separated by prominent fibrous bands, often linked to chronic hepatitis infections. Mixed cirrhosis combines both small and large nodules, reflecting advanced or evolving liver pathology.
Q4: What general symptoms do cirrhosis patients experience?
Cirrhosis presents with general symptoms including fatigue, loss of appetite, and weight loss. These occur alongside gastrointestinal symptoms such as nausea, vomiting, tender hepatomegaly, and jaundice. The combination of these symptoms reflects the progressive decline in liver function and metabolic capacity.
Q5: What extrahepatic signs indicate advanced cirrhosis?
Advanced cirrhosis produces extrahepatic signs including palmar erythema, spider angiomas, and muscle wasting. Men may develop gynecomastia and testicular atrophy, while women experience menstrual irregularities. Enlargement of the parotid and lacrimal glands also occurs, reflecting systemic effects of hepatic dysfunction and portal hypertension.
Q6: How do autoimmune and metabolic disorders contribute to cirrhosis?
Autoimmune liver diseases like autoimmune hepatitis trigger chronic inflammation and hepatocyte loss, activating fibrogenic pathways that lead to cirrhosis. Inherited metabolic disorders such as hemochromatosis, Wilson disease, and alpha-1 antitrypsin deficiency cause progressive liver damage through abnormal accumulation or deficiency of essential proteins, ultimately resulting in cirrhosis.
Q7: What role does chronic inflammation play in cirrhosis development?
Chronic inflammation from sustained liver injury activates fibrogenic pathways, leading to hepatocyte loss and progressive fibrosis. Regardless of the underlying cause—whether viral hepatitis, alcohol, or metabolic dysfunction—all pathways converge on chronic inflammation as the central mechanism driving scar tissue formation and cirrhosis ii pathophysiology.