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Related Concept Videos

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...
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...
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...
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...
Bacterial Meningitis01:24

Bacterial Meningitis

Bacterial meningitis is a severe infectious disease involving inflammation of the meninges, the protective membranes surrounding the brain and spinal cord. It occurs when pathogenic bacteria cross the blood–brain barrier and enter the cerebrospinal fluid. Common causative organisms include Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae type b, Listeria monocytogenes, and Escherichia coli K1. The exact route of entry varies by pathogen and host condition.Routes of Entry...
Brain Abscess l: Introduction01:26

Brain Abscess l: Introduction

A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial infections,...

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Pathogenesis of septic encephalopathy.

Peter Pytel1, Jessy J Alexander

  • 1Department of Pathology, University of Chicago, Chicago, Illinois 60637, USA.

Current Opinion in Neurology
|April 24, 2009
PubMed
Summary
This summary is machine-generated.

Septic encephalopathy, a complication of severe sepsis, involves complex mechanisms affecting brain function. Understanding these pathways offers new therapeutic targets to improve patient survival.

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Area of Science:

  • Neuroscience
  • Immunology
  • Critical Care Medicine

Background:

  • Septic encephalopathy is a common neurological complication of severe sepsis.
  • Its precise pathogenesis and underlying mechanisms remain incompletely understood.
  • This review synthesizes recent findings on septic encephalopathy.

Purpose of the Study:

  • To review recent advances in understanding septic encephalopathy.
  • To cover molecular mechanisms, behavioral changes, diagnostics, and therapeutics.
  • To highlight current knowledge gaps and future research directions.

Main Methods:

  • Literature review of recent studies on septic encephalopathy.
  • Analysis of molecular, cellular, and systemic mechanisms.
  • Examination of diagnostic and therapeutic strategies.

Main Results:

  • Microcirculatory failure precedes electrophysiological changes in septic encephalopathy.
  • Blood-brain barrier integrity is linked to intercellular adhesion molecule expression and pericyte behavior.
  • Neuroinflammation is modulated by macrophage infiltration and complement activation.
  • Mitochondrial dysfunction and nitric oxide synthase impact brain function.
  • Growth hormone levels predict mortality in sepsis.
  • Septic rats exhibit memory deficits and depressive symptoms, serving as relevant models.

Conclusions:

  • Septic encephalopathy is a complex, dynamic condition involving multiple interconnected pathways.
  • Further elucidation of pathogenesis will identify novel therapeutic targets.
  • Developing specific treatments for septic encephalopathy may improve survival rates.