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Related Concept Videos

Malaria01:29

Malaria

Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
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Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...
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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...
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...
Rocky Mountain Spotted Fever01:26

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Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
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...

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In Vivo Tracking of Edema Development and Microvascular Pathology in a Model of Experimental Cerebral Malaria Using Magnetic Resonance Imaging
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Is human malarial coma caused, or merely deepened, by sequestration?

Ian A Clark1, Lisa M Alleva

  • 1School of Biochemistry and Molecular Biology, Australian National University, Canberra, ACT 0200, Australia. ian.clark@anu.edu.au

Trends in Parasitology
|June 23, 2009
PubMed
Summary
This summary is machine-generated.

Falciparum malaria coma may not be primarily caused by blocked blood flow. New research suggests brain inflammation and cytokines, like tumor necrosis factor, are more likely culprits in malaria-induced coma.

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Area of Science:

  • Neuroscience
  • Infectious Diseases
  • Pathophysiology

Background:

  • Research on falciparum malaria coma often assumes vascular obstruction by parasitized red blood cells is the primary cause.
  • Recent findings in vivax malaria suggest it alters brain function similarly to falciparum malaria, despite not typically blocking blood flow.
  • This challenges the long-held vascular obstruction hypothesis for falciparum malaria coma.

Purpose of the Study:

  • To reassess the primary cause of coma in falciparum malaria.
  • To investigate the role of cytokines and systemic inflammation in malaria-induced brain dysfunction.
  • To explore alternative mechanisms beyond vascular obstruction.

Main Methods:

  • Comparative analysis of clinical presentations and pathophysiological data between falciparum and vivax malaria.
  • Review of existing literature on cerebral malaria and cytokine involvement.
  • Evaluation of the impact of systemic inflammation on brain function.

Main Results:

  • Evidence suggests Plasmodium vivax malaria can cause significant brain dysfunction without apparent vascular obstruction.
  • This finding questions the exclusive focus on vascular obstruction in Plasmodium falciparum malaria.
  • Cytokine enhancement, particularly tumor necrosis factor, driven by systemic inflammation appears crucial.

Conclusions:

  • Vascular obstruction may not be the sole or primary cause of falciparum malaria coma.
  • Brain-origin cytokines, modulated by systemic inflammation, are a more promising area for research into malaria-induced coma.
  • Understanding neuronal homeostasis and cytokine roles offers a more fruitful research direction.