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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...
Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test01:22

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...
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...
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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Hepatic encephalopathy: An approach to its multiple pathophysiological features.

Juan Carlos Perazzo1, Silvina Tallis, Amalia Delfante

  • 1Juan Carlos Perazzo, Silvina Tallis, Amalia Delfante, Pablo Andrés Souto, Abraham Lemberg, Francisco Xavier Eizayaga, Salvador Romay, Laboratory of Portal Hypertension and Hepatic Encephalopathy, Pathophysiology, School of Pharmacy and Biochemistry, University of Buenos Aires, Junin 950, CP 1113, Buenos Aires, Argentina.

World Journal of Hepatology
|April 11, 2012
PubMed
Summary

Hepatic encephalopathy (HE) is a serious condition linked to liver failure, primarily caused by elevated ammonia levels. Further research is needed to clarify controversial aspects of HE pathophysiology.

Keywords:
Ammonia and central nervous systemHepatic encephalopathyHyperammonemiaLiver failure

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Area of Science:

  • Neuroscience
  • Hepatology
  • Biochemistry

Background:

  • Hepatic encephalopathy (HE) is a complex neuropsychiatric syndrome complicating acute and chronic liver failure.
  • Pathophysiology involves neurotransmission disorders, altered sleep and cognition, metabolic changes, oxidative stress, and neuroinflammation.
  • Acute HE presents an imminent threat due to astrocyte swelling, while chronic HE shows alterations in calcium signaling and receptor expression.

Purpose of the Study:

  • To review the current understanding of hepatic encephalopathy pathophysiology.
  • To highlight areas requiring further research to clarify controversial topics in HE.
  • To emphasize the central role of ammonia in HE development.

Main Methods:

  • Review of existing literature on hepatic encephalopathy.
  • Analysis of molecular and cellular mechanisms underlying HE.
  • Discussion of ammonia's role and its trafficking in hyperammonemic conditions.

Main Results:

  • Ammonia is identified as the primary neurotoxic molecule triggering or facilitating HE-related changes.
  • Ammonia plasma levels are significantly elevated in HE patients, particularly in acute liver failure.
  • Hepatic ammonia removal involves the urea cycle and glutamine synthetase, which are compromised in liver damage.

Conclusions:

  • Hepatic encephalopathy is a multifactorial syndrome with ammonia as a key player.
  • Understanding HE pathophysiology is evolving, with new therapeutic targets emerging.
  • Further research is essential to resolve controversial aspects and improve HE management.