– A chronic degenerative disease of the liver characterized by destruction of the hepatic parenchymal cells, which are replaced by regenerative nodules surrounded by fibrotic tissue.
Causes and Incidence
The etiology is not fully understood, but several factors play important roles, including alcohol abuse; malnutrition; infectious processes (e.g., hepatitis, schistosomiasis, syphilis); toxins (e.g., arsenic, carbon tetrachloride, phosphorus); drugs (e.g., chlorpromazine, methyldopa, methotrexate, tolbutamide, isoniazid, amitrip-tyline); genetic disorders (e.g., galactosemia, Wilson’s disease, alpha-antitrypsin deficiency); congenital malformations (e.g., biliary atresia); and vascular disorders (e.g., portal vein thrombosis, Budd-Chiari syndrome, chronic heart failure). Other factors remain unknown.
In the United States, most cirrhosis develops secondary to alcohol abuse. It is the ninth leading cause of death across all age groups, and the third leading cause of death in the 45 to 65 age group. In Africa and Asia, cirrhosis secondary to chronic viral hepatitis B is a major cause of death.
Cirrhosis is the end-stage disease that begins with one of the many etiologic factors. The development and progression of cirrhosis are tied to the severity of the injury and the liver’s response. A severe, acute injury may be involved, as in hepatitis, or a moderate chronic injury may be the cause, as in alcohol abuse. When an injury causes destruction of parenchymal cells, the initial response is fibrosis, as the liver attempts to repair itself. Fat-storing cells proliferate and are transformed into myofibroblasts, which alter the secretion, synthesis, and degradation of collagen. This results in deposition of excessive connective tissue, which alters normal lobular structures, interferes with cellular nutrition, obstructs hepatic blood flow, and forms anastomotic channels that shunt arterial blood away to efferent hepatic veins. The regenerative attempts continue as long as an injury is present. The resulting changes in the intrahepatic circulatory pathways make the system less efficient and eventually lead to an increase in portal vein pressure. The change in or destruction of lobular architecture interferes with various liver functions, such as metabolism, detoxification, storage, and blood and bile formation.
Often asymptomatic; otherwise, abdominal pain, diarrhea, nausea, vomiting, fatigue, fever
Chronic dyspepsia, constipation, anorexia, weight loss, pruritus, easy bruising, bleeding gums, nose bleeds, upper gastrointestinal bleeding, enlarged liver
Telangiectasis, spider angiomas, enlarged breasts, testicular atrophy, jaundice, impotence, enlarged spleen, depression, abdominal vein distention, ascites, encephalopathy, peripheral neuropathy
Complications include bleeding esophageal varices, which can lead to massive hemorrhage; hepatorenal syndrome, which leads to renal failure; and hepatic encephalopathy, which leads to coma and death.
Definitive histologic changes
Complete blood count
Evidence of anemia, leukopenia, thrombocytopenia
Hepatosplenomegaly, enlarged portal veins
Reduced liver uptake
Liver transplantation for advanced disease; portal systemic shunt to treat resistant esophageal varices; peritoneovenous shunt for ascites.
Diuretics to reduce edema; digestants to promote fat digestion; supplemental vitamins; stool softeners.
Elimination of toxic agents such as alcohol or drugs; diet high in protein, carbohydrates, and calories and low in sodium; blood and blood products, gastric lavage, esophageal balloon for bleeding varices; abdominal paracentesis for ascites; renal dialysis for renal failure.