Elevated ammonia with changes in mental status indicates which condition?

• A. Hepatic encephalopathy
• B. Portal hypertension
• C. Cirrhosis
• D. Asterixis

Answer: (A)

Elevated ammonia with changes in mental status points to hepatic encephalopathy, a neuropsychiatric complication of liver dysfunction or portosystemic shunting. The liver normally detoxifies ammonia, a byproduct of protein metabolism produced by gut bacteria, by converting it to urea for excretion. When liver function is impaired or blood bypasses the liver, ammonia accumulates in the bloodstream and crosses into the brain. In the CNS, ammonia disrupts astrocyte function and neurotransmission, leading to cognitive changes, personality and mood alterations, sleep disturbances, and progressive confusion or coma. Asterixis is a common sign seen with hepatic encephalopathy, but it’s a physical finding rather than the condition itself; portal hypertension and cirrhosis are related to liver disease but do not by themselves explain the acute mental-status changes caused by ammonia buildup. Management centers on reducing ammonia production and absorption (lactulose to acidify the gut and trap ammonia, rifaximin to decrease gut bacteria), addressing precipitating factors, and supporting liver function.