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Cerebral malaria-using the retina to study the brain.

Nicholas A V Beare1

  • 1Department of Eye and Vision Science, University of Liverpool, Liverpool, L7 8TX, UK. nbeare@liverpool.ac.uk.

Eye (London, England)
|February 14, 2023
PubMed
Summary

Cerebral malaria (CM) in African children can be diagnosed and prognosed using malarial retinopathy signs. Retinal imaging reveals distinct mechanisms for death and neurological sequelae in CM.

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Area of Science:

  • Ophthalmology
  • Neurology
  • Infectious Diseases

Background:

  • Cerebral malaria (CM) causes significant child mortality in Africa.
  • Malarial retinopathy offers diagnostic and prognostic insights into CM.
  • The retina serves as a window into the brain's pathophysiology during CM.

Purpose of the Study:

  • To investigate the pathophysiology of CM using retinal imaging.
  • To differentiate mechanisms leading to death versus neurological sequelae in CM.
  • To explore the utility of OCT in identifying CM severity and outcomes.

Main Methods:

  • Utilized fluorescein angiography and optical coherence tomography (OCT) to assess retinal changes in CM.
  • Examined blood-retina barrier breakdown patterns (large focal, punctate, vessel leak).
  • Correlated retinal findings with brain swelling and clinical outcomes (death, neurological sequelae).

Main Results:

  • Patchy capillary non-perfusion and ischemic changes are common in CM retinas.
  • Distinct blood-retina barrier breakdown types correlate with different outcomes: severe swelling/death (punctate/large focal leak) vs. moderate swelling/sequelae (vessel leak/non-perfusion).
  • Death and neurological sequelae appear to have separate underlying mechanisms.

Conclusions:

  • Malarial retinopathy provides crucial insights into CM pathophysiology.
  • Retinal imaging can distinguish between mechanisms of fatal CM and those leading to neurological deficits.
  • OCT of the optic nerve head and macula may aid in predicting severe brain swelling and neurological sequelae risk in CM.

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