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Hepatic encephalopathy
Definition:
Hepatic encephalopathy is brain and nervous system damage that occurs as a complication of liver disorders. It is characterized by various neurologic symptoms including changes in reflexes, changes in consciousness, and behavior changes that can range from mild to severe. Alternative Names:
Hepatic coma; Encephalopathy - hepatic Text Continues Below
Causes, incidence, and risk factors:
Hepatic encephalopathy is caused by disorders affecting the liver. These include disorders that reduce liver function (such as cirrhosis or hepatitis) and conditions where blood circulation bypasses the liver. The exact cause of the disorder is unknown.
However, when the liver cannot properly metabolize and detoxify substances in the body, toxic substances build up in the bloodstream. One substance believed to be particularly toxic to the central nervous system is ammonia, which is produced by the body when proteins are digested, but is normally detoxified by the liver. Many other substances may also accumulate in the body and contribute to damage to the nervous system.
In people with otherwise stable liver disorders, hepatic encephalopathy may be triggered by episodes of gastrointestinal bleeding, excessive intake of dietary protein, electrolyte abnormalities (especially decrease in potassium, which may result from vomiting or treatments such as diuretics or paracentesis), infections, renal disease, and procedures that shunt (bypass) blood past the liver. The disorder may also be triggered by any condition that results in alkalosis (alkaline blood pH), low oxygen levels in the body, use of medications that suppress the central nervous system (such as barbiturates or benzodiazepine tranquilizers), surgery, and sometimes by co-occurring illness.
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