Brain magnetic resonance in hepatic encephalopathy

Area of Science:

• Neurology
• Radiology
• Gastroenterology

Background:

• Hepatic encephalopathy (HE) is a neuropsychiatric disorder linked to portal-systemic shunting.
• It often accompanies cirrhosis but can occur in acute liver failure or with shunts unrelated to liver disease.
• Accurate diagnosis involves confirming liver dysfunction or shunts and ruling out other neurological conditions.

Purpose of the Study:

• To explore how various magnetic resonance (MR) techniques enhance understanding of hepatic encephalopathy (HE) pathophysiology.
• To identify MR-based biomarkers for monitoring HE therapeutic interventions.

Main Methods:

• Utilized proton MR spectroscopy and T1-weighted imaging to detect and quantify brain metabolites like glutamine and manganese.
• Employed T2-weighted and diffusion-weighted imaging to identify white matter abnormalities associated with hyperammonemia.
• Correlated MR findings with liver function and outcomes post-liver transplantation.

Main Results:

• Proton MR spectroscopy and T1-weighted imaging successfully detected and quantified abnormal brain metabolite accumulations (glutamine, manganese).
• T2-weighted and diffusion-weighted imaging revealed white matter changes linked to hyperammonemia-induced cell volume disturbances.
• Observed partial or complete recovery of MR-detected abnormalities following liver function normalization or transplantation.

Conclusions:

• MR techniques significantly advance the understanding of HE pathogenesis.
• Specific MR findings serve as valuable biomarkers for assessing treatment efficacy in HE patients.