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When the liver has been damaged, it may not be able to filter poisons from the bloodstream, especially substances in the blood produced by bacteria in the large intestine. As a result, these substances (which include ammonia) may build up in the bloodstream and cause problems in your brain called encephalopathy.
Symptoms of encephalopathy may include:
Encephalopathy is most likely to occur in people who have high blood pressure in the portal vein system (portal hypertension). But it may also occur in people who have severe acute liver damage but do not have portal hypertension.
Certain procedures (such as shunting, which redirects the flow of blood or fluid through other areas of the body) that help lower portal hypertension and prevent variceal bleeding may actually increase your risk for encephalopathy.
Many things can contribute to encephalopathy. These may include the use of sedatives, opioids, or alcohol. Other things that may increase your risk include gastrointestinal bleeding, abnormal levels of electrolytes in the blood (especially low potassium levels), the amount of protein in the diet, infection such as peritonitis, dehydration, or constipation.
Most cases of encephalopathy are treated using a medicine called lactulose. This drug helps prevent the buildup of substances in the large intestine that may lead to encephalopathy. Lactulose is effective at decreasing ammonia levels in the blood and improving encephalopathy.
If you have had many cases of encephalopathy, your doctor may give you another medicine called rifaximin. This medicine may be used with lactulose to help prevent encephalopathy.
Adaptation Date: 2/22/2022
Adapted By: Alberta Health Services
Adaptation Reviewed By: Alberta Health Services
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