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Hepatic Encephalopathy: Current Thoughts on Pathophysiology and Management.

Barun Kumar Sen¹, Kausik Pan¹, Ambar Chakravarty²

¹Department of Neurology, Vivekananda Institute of Medical Sciences, Kolkata, West Bengal, India.

Current Neurology and Neuroscience Reports

|March 28, 2025

Summary

Hepatic encephalopathy (HE) involves neurological and psychiatric issues due to liver insufficiency, often caused by ammonia buildup. Treatments focus on reducing ammonia and managing gut toxins, with liver transplantation as a last resort.

Keywords:

Ammonia Antibacterials Astrocytic swelling Cerebral edema Controlled ventilation Gut microbiome Hepatic encephalopathy Lactulose Liver transplantation Mannitol Urea cycle

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Area of Science:

Hepatology
Neurology
Gastroenterology

Background:

Hepatic encephalopathy (HE) is a complex neuropsychiatric complication of liver dysfunction.
It presents as a spectrum from subtle cognitive changes to coma.
Pathophysiology involves hyperammonemia, neuroinflammation, and gut-brain axis disturbances.

Purpose of the Study:

To review the causes, types, and clinical staging of hepatic encephalopathy.
To discuss current understanding of HE's pathogenetic mechanisms.
To outline currently practiced therapeutic options for HE.

Main Methods:

Literature review of causes, mechanisms, and treatments of HE.
Analysis of current research on ammonia metabolism and neuroinflammation.
Discussion of therapeutic strategies including pharmacological and supportive measures.

Main Results:

HE encompasses covert and overt forms, with covert HE showing behavioral and cognitive impairment.
Hyperammonemia, neuroinflammation (TNF-α, IL-6, IL-17), gut dysbiosis, and metal deposition (manganese, zinc) contribute to HE.
Therapies include lactulose, rifaximin, L-ornithine L-aspartate (LOLA), and in refractory cases, liver transplantation or liver assist devices.

Conclusions:

HE pathogenesis is multifactorial, involving ammonia toxicity, neuroinflammation, and gut-derived toxins.
Therapeutic approaches aim to reduce ammonia production/absorption and mitigate neuroinflammation.
Management strategies are evolving, with advanced options like liver transplantation offering definitive treatment.