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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...
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...
Encephalitis l: Introduction01:19

Encephalitis l: Introduction

Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
Arboviral Encephalitis01:25

Arboviral Encephalitis

Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

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Related Experiment Video

Updated: May 15, 2026

Generation of a Rat Model of Acute Liver Failure by Combining 70% Partial Hepatectomy and Acetaminophen
09:44

Generation of a Rat Model of Acute Liver Failure by Combining 70% Partial Hepatectomy and Acetaminophen

Published on: November 27, 2019

Pathogenesis of hepatic encephalopathy.

Irena Ciećko-Michalska1, Małgorzata Szczepanek, Agnieszka Słowik

  • 1Department of Gastroenterology, Hepatology and Infectious Diseases, Jagiellonian University Medical College, Sniadeckich Street 5, 31-531 Krakow, Poland.

Gastroenterology Research and Practice
|January 15, 2013
PubMed
Summary

Hepatic encephalopathy, a complication of liver disease, is primarily caused by high ammonia levels. Emerging research highlights small intestine bacterial overgrowth (SIBO) as a factor in its development.

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Area of Science:

  • Hepatology
  • Neurology
  • Gastroenterology

Background:

  • Hepatic encephalopathy (HE) is a severe complication of acute liver failure and chronic liver diseases, particularly liver cirrhosis.
  • Hyperammonemia is the primary driver in the pathogenesis of HE.
  • Several factors contribute to HE, including brain-blood barrier issues, altered neurotransmission, neuroinflammation, oxidative stress, and manganese toxicity.

Purpose of the Study:

  • To review current understanding of the pathogenesis of hepatic encephalopathy.
  • To explore the multifactorial mechanisms underlying HE development.
  • To highlight recent findings on the role of small intestine bacterial overgrowth (SIBO) in minimal HE.

Main Methods:

  • Literature review of current research on hepatic encephalopathy.
  • Synthesis of data on established and emerging pathogenetic mechanisms.
  • Analysis of studies investigating the link between SIBO and minimal HE.

Main Results:

  • Hyperammonemia is central to HE pathogenesis.
  • Multiple neurobiological disturbances, including neuroinflammation and oxidative stress, are implicated.
  • Small intestine bacterial overgrowth (SIBO) is increasingly recognized as a contributor to minimal hepatic encephalopathy.

Conclusions:

  • Hepatic encephalopathy pathogenesis is complex, involving hyperammonemia and various neurobiological alterations.
  • SIBO represents a significant, recently emphasized factor in minimal hepatic encephalopathy.
  • Further research into these mechanisms can guide improved therapeutic strategies for HE.