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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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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...
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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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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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Metabolic encephalopathies.

Michael J Angel1, G Bryan Young

  • 1Division of Neurology, Department of Medicine, University of Toronto, Toronto, ON, Canada. mike.angel@utoronto.ca

Neurologic Clinics
|October 29, 2011
PubMed
Summary
This summary is machine-generated.

Metabolic encephalopathy, a global brain dysfunction from systemic stress, presents diversely. Understanding its causes, like toxic metabolites and energy failure, is key for management.

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Area of Science:

  • Neurology
  • Internal Medicine
  • Toxicology

Background:

  • Metabolic encephalopathy is a clinical syndrome of global cerebral dysfunction caused by systemic stressors.
  • It was first described by Kinnier Wilson, with presentations ranging from mild cognitive impairment to deep coma.

Purpose of the Study:

  • To review the common causes of metabolic encephalopathy.
  • To describe the clinical presentations associated with these causes.
  • To discuss management strategies where applicable.

Main Methods:

  • Review of literature on metabolic encephalopathy.
  • Focus on common etiologies and their pathophysiological mechanisms.
  • Synthesis of clinical findings and management approaches.

Main Results:

  • Numerous systemic conditions can induce metabolic encephalopathy.
  • Mechanisms include cerebral edema, neurotransmitter dysfunction, toxic metabolite accumulation, and energy failure.
  • Clinical manifestations are highly variable depending on the underlying cause and severity.

Conclusions:

  • Metabolic encephalopathy is a complex condition with diverse underlying causes and presentations.
  • Understanding the specific mechanisms is crucial for effective diagnosis and treatment.
  • This review highlights common causes, clinical features, and management principles.