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Related Concept Videos

Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
Hepatitis01:25

Hepatitis

Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...
Huntington Disease l: Introduction01:21

Huntington Disease l: Introduction

Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Dementia l: Introduction01:22

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
Cirrhosis II: Pathophysiology01:24

Cirrhosis II: Pathophysiology

Cirrhosis is a progressive chronic liver injury caused by prolonged inflammation, excessive fibrotic remodeling, and impaired regeneration. Over time, repeated hepatic insults disrupt the liver’s architecture and function, leading to reduced blood flow, impaired bile drainage, and diminished metabolic capacity.Pathophysiology of cirrhosisCirrhosis arises from three main responses to chronic liver damage: inflammation, immune activation, and hepatocyte death. These processes lead to structural...

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Related Experiment Video

Updated: Jun 25, 2026

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
08:29

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans

Published on: December 18, 2016

Acquired hepatocerebral degeneration.

Joseph Ferrara1, Joseph Jankovic

  • 1Dept. of Neurology, Baylor College of Medicine, 6550 Fannin, Suite 1801, Houston, Texas 77030, USA.

Journal of Neurology
|February 19, 2009
PubMed
Summary

Cirrhosis can lead to acquired hepatocerebral degeneration (AHD), a progressive neurological disorder. This review covers AHD

Area of Science:

  • Neurology
  • Hepatology
  • Neuroscience

Background:

  • Cirrhosis, a severe liver disease, presents numerous neurological complications.
  • Toxic metabolic encephalopathy is a common complication.
  • Acquired hepatocerebral degeneration (AHD) is a chronic, progressive neurological syndrome seen in some patients with chronic liver disease.

Observation:

  • AHD is characterized by movement disorders, including parkinsonism and ataxia.
  • The syndrome develops in a subset of individuals with chronic liver conditions.

Findings:

  • This review synthesizes current knowledge on AHD's clinical presentation.
  • Pathophysiology, neuroimaging findings, and differential diagnoses are discussed.
  • Emerging therapeutic strategies for AHD are explored.

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The CYP2D6 Animal Model: How to Induce Autoimmune Hepatitis in Mice
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The CYP2D6 Animal Model: How to Induce Autoimmune Hepatitis in Mice

Published on: February 3, 2012

Related Experiment Videos

Last Updated: Jun 25, 2026

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
08:29

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans

Published on: December 18, 2016

The CYP2D6 Animal Model: How to Induce Autoimmune Hepatitis in Mice
09:03

The CYP2D6 Animal Model: How to Induce Autoimmune Hepatitis in Mice

Published on: February 3, 2012

Implications:

  • Understanding AHD is crucial for managing neurological complications in liver disease.
  • Improved diagnostic and therapeutic approaches may enhance patient outcomes.
  • Further research into AHD pathophysiology could reveal novel treatment targets.