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Hepatic Encephalopathy01:29

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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...
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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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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...
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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,...
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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...

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Related Experiment Video

Updated: May 17, 2026

Viral Tracing of Genetically Defined Neural Circuitry
13:06

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Published on: October 17, 2012

Heroin spongiform leukoencephalopathy (HSLE).

A G Bach1, B Jordan, N A Wegener

  • 1Department of Radiology, Martin-Luther-University Halle-Wittenberg, Halle/Salle, Germany. mail@andreas-bach.de

Clinical Neuroradiology
|October 12, 2012
PubMed
Summary

Inhaling heroin can cause a rare brain condition called heroin-induced spongiform leukoencephalopathy (HSLE). This condition, often missed, may be treatable with antioxidants.

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Area of Science:

  • Neurology
  • Toxicology

Background:

  • Heroin use is shifting towards inhalation, particularly among young and new users.
  • A rare but serious complication of inhaled heroin is heroin-induced spongiform leukoencephalopathy (HSLE).

Observation:

  • HSLE is characterized by oligodendrocyte mitochondrial dysfunction.
  • The condition progresses through three distinct clinical stages.
  • Magnetic resonance imaging (MRI) is crucial for diagnosing HSLE.

Findings:

  • Treatment options for HSLE are limited, with antioxidants and coenzyme Q showing potential benefits.
  • The disorder is typically self-limiting.
  • Complications like hydrocephalus may necessitate neurosurgical intervention.

Implications:

  • HSLE is an underdiagnosed condition in heroin abusers, potentially contributing to unexplained drug-related deaths.
  • HSLE symptoms can mimic drug withdrawal, complicating diagnosis.