Hepatic encephalopathy in advanced liver disease results primarily from decreased metabolism of which molecule?

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Multiple Choice

Hepatic encephalopathy in advanced liver disease results primarily from decreased metabolism of which molecule?

Ammonia is the molecule whose decreased hepatic metabolism drives hepatic encephalopathy. In a healthy liver, ammonia produced by gut bacteria is converted to urea via the urea cycle and then excreted. When liver function is severely impaired, that detoxification slows, ammonia accumulates in the blood, crosses the blood–brain barrier, and disrupts brain function, leading to the neuropsychiatric changes seen in hepatic encephalopathy. Bilirubin may rise with liver disease but it does not cause encephalopathy. The key issue is elevated ammonia due to reduced hepatic metabolism, sometimes exacerbated by portosystemic shunting that bypasses the liver.

Ammonia is the molecule whose decreased hepatic metabolism drives hepatic encephalopathy. In a healthy liver, ammonia produced by gut bacteria is converted to urea via the urea cycle and then excreted. When liver function is severely impaired, that detoxification slows, ammonia accumulates in the blood, crosses the blood–brain barrier, and disrupts brain function, leading to the neuropsychiatric changes seen in hepatic encephalopathy. Bilirubin may rise with liver disease but it does not cause encephalopathy. The key issue is elevated ammonia due to reduced hepatic metabolism, sometimes exacerbated by portosystemic shunting that bypasses the liver.

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