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Cerebral changes in hepatic encephalopathy

A Watanabe1

  • 1Third Department of Internal Medicine, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Japan.

Journal of Gastroenterology and Hepatology
|August 26, 1998
PubMed
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Subclinical hepatic encephalopathy (SHE) in cirrhosis patients can be diagnosed using advanced neuropsychological tests and brain imaging. Early detection of SHE is crucial for preventing progression to overt hepatic encephalopathy (HE).

Area of Science:

  • Neuroscience and Hepatology
  • Clinical Neurophysiology
  • Medical Imaging

Background:

  • Overt hepatic encephalopathy (HE) involves significant consciousness impairment and is a medical emergency.
  • Subclinical hepatic encephalopathy (SHE) affects cirrhotic patients without overt symptoms but can be detected through sensitive tests.
  • Recognizing SHE is vital for preventing its progression to overt HE, maintaining cirrhosis in a compensated state, and enabling home-based patient management.

Purpose of the Study:

  • To introduce a novel diagnostic method for subclinical hepatic encephalopathy (SHE) in cirrhotic patients.
  • To utilize quantitative neuropsychological testing and advanced neuroimaging for SHE diagnosis and pathophysiology elucidation.
  • To explore the potential of these methods in evaluating treatment efficacy for HE.

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Main Methods:

  • Development of a computerized quantitative neuropsychological test for SHE diagnosis.
  • Evaluation of cerebral function using visually evoked potentials (P3 wave) and event-related potentials (P300 wave) with brain mapping.
  • Assessment of brain morphology and function via electroencephalography (EEG) with automated polysomnography, computed tomography (CT), magnetic resonance imaging (MRI), single-photon emission computed tomography (SPECT), and proton magnetic resonance spectroscopy (1H-MRS).

Main Results:

  • Prolonged P3 and P300 latencies were observed in cirrhotic patients with SHE.
  • Brain imaging revealed brain atrophy, basal ganglia hyperintensities (MR-T1), reduced regional cerebral blood flow (SPECT), and altered choline/N-acetylaspartic acid ratios in the hippocampus (1H-MRS) in SHE patients.
  • Automated polysomnography detected sleep disturbances in SHE patients, and branched-chain amino acid (BCAA) showed potential as a psychotropic agent.

Conclusions:

  • A new diagnostic approach combining quantitative neuropsychological tests and neuroimaging effectively identifies subclinical hepatic encephalopathy (SHE).
  • These methods provide insights into HE pathophysiology and can monitor treatment responses, such as with BCAA and choline.
  • Early diagnosis and management of SHE are critical for improving patient outcomes and preventing the progression of liver disease.