Plasma amino acids in hepatic encephalopathy.

Area of Science:

• Biochemistry
• Hepatology
• Clinical Nutrition

Background:

• Liver cirrhosis is associated with altered plasma amino acid profiles.
• Hepatic encephalopathy (HE) is a severe complication of liver cirrhosis.

Purpose of the Study:

• To investigate the correlation between plasma amino acids and liver function tests in cirrhosis.
• To assess the role of plasma amino acids in the pathogenesis of hepatic encephalopathy.

Main Methods:

• Plasma amino acids were analyzed using ion exchange chromatography in 75 liver cirrhosis patients.
• Correlations were drawn between amino acid levels and liver function tests (prothrombin time, pseudocholinesterase, albumin, GOT, bilirubin, ammonia).
• Plasma amino acid profiles were compared between cirrhotic patients with and without hepatic encephalopathy.

Main Results:

• Branched-chain amino acids and Fischer's quotient significantly correlated with prothrombin time, pseudocholinesterase, and serum albumin.
• Methionine and aromatic amino acids showed inverse correlations with these liver function parameters.
• No significant differences in plasma amino acid levels were found between cirrhotic patients with and without HE; Fischer's quotient overlapped.
• Therapeutic administration of specific amino acid mixtures transiently corrected imbalances and improved HE.

Conclusions:

• Plasma amino acid alterations in cirrhosis are linked to liver dysfunction but do not solely account for hepatic encephalopathy.
• Fischer's quotient alone is insufficient to predict or explain the onset of HE.
• Targeted amino acid therapy offers a potential short-term management strategy for HE in liver cirrhosis.