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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...
Portal Hypertension01:22

Portal Hypertension

Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...
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...
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...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...

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Related Experiment Video

Updated: Jun 25, 2026

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
07:36

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats

Published on: November 20, 2015

[Pathogenesis of portal systemic encephalopathy].

D García Compeán1, R Valadez Castillo, R F Barragán

  • 1Departamento de Medicina Interna, Servicio de Gastroenterología del Hospital Universitario "Dr. José E. González" de la Universidad Autónoma de Nuevo León, Monterrey, NL México.

Revista De Investigacion Clinica; Organo Del Hospital De Enfermedades De La Nutricion
|March 5, 2009
PubMed
Summary

Hepatic encephalopathy is a complex neurological disorder caused by metabolic issues. This review explores key theories, including ammonia, neurotransmitter imbalances, and zinc deficiency, in understanding its development.

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Last Updated: Jun 25, 2026

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
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Published on: November 20, 2015

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Published on: March 26, 2019

Area of Science:

  • Neuroscience
  • Biochemistry
  • Gastroenterology

Context:

  • Hepatic encephalopathy (HE) is a serious complication of liver dysfunction.
  • It presents as a spectrum of neuropsychiatric abnormalities.
  • Understanding HE's pathophysiology is crucial for effective management.

Purpose:

  • To review and analyze the major physiopathogenic theories of hepatic encephalopathy.
  • To discuss the roles of ammonia, mercaptans, false neurotransmitters, GABA, endogenous benzodiazepines, and zinc deficiency.
  • To incorporate emerging biochemical concepts in neurotransmission.

Summary:

  • Hepatic encephalopathy arises from multifactorial metabolic disruptions affecting brain function.
  • Key theories involve elevated ammonia, altered neurotransmitter systems (GABA, false neurotransmitters), and potential zinc deficiency.
  • Newer biochemical insights into neurotransmission are also considered.

Impact:

  • Provides a comprehensive overview of HE pathogenesis.
  • Aids researchers and clinicians in understanding the complex mechanisms underlying HE.
  • Facilitates the development of targeted therapeutic strategies for liver disease patients.