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Related Experiment Videos

Microvascular changes in experimental branch retinal vein occlusion.

R P Danis1, I H Wallow

  • 1Department of Ophthalmology, University of Wisconsin School of Medicine, Madison 53792.

Ophthalmology
|October 1, 1987
PubMed
Summary

Branch retinal vein occlusion (BVO) leads to increased endothelial cells in collateral vessels and decreased pericyte cells in hypoperfused capillaries. These changes in retinal vasculature can persist for years after the initial occlusion.

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Area of Science:

  • Ophthalmology
  • Vascular Biology
  • Retinal Diseases

Background:

  • Branch retinal vein occlusion (BVO) can lead to significant visual impairment.
  • Understanding the long-term changes in retinal vasculature after BVO is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the histopathological changes in collateral vessel maturation and capillary nonperfusion following BVO in a non-human primate model.
  • To assess the duration-dependent effects of BVO on retinal microvasculature up to 48 months post-occlusion.

Main Methods:

  • Clinical and histopathological examination of retinal vasculature in a monkey model of BVO.
  • Quantification of endothelial and pericyte density in dilated, normal caliber, and patent capillaries in hypoperfused regions.

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Main Results:

  • Increased endothelial cell density was observed in collateral vessels, irrespective of BVO duration (4 to 15.5 months).
  • Patent capillaries in hypoperfused areas showed increased endothelial density but decreased pericyte density.
  • Pericyte loss was independent of BVO duration, while endothelial density in these capillaries may normalize over time.

Conclusions:

  • Collateral vessel formation involves endothelial cell proliferation, while hypoperfused capillaries experience pericyte loss.
  • These microvascular adaptations following BVO demonstrate long-term changes in retinal vasculature that can persist for years.