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Related Experiment Videos

Central retinal artery occlusion. Retinal survival time.

Sohan Singh Hayreh1, M Bridget Zimmerman, Alan Kimura

  • 1Department of Ophthalmology and Visual Sciences, College of Medicine, University Hospitals and Clinics, University of Iowa, 200 Hawkins Drive, Iowa City, IA 55242-1091, USA. sohan-hayreh@uiowa.edu

Experimental Eye Research
|April 27, 2004
PubMed
Summary

Central retinal artery occlusion (CRAO) in rhesus monkeys shows no retinal damage at 97 minutes. Longer occlusion times, especially around 240 minutes, lead to extensive and irreversible retinal damage.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vascular Biology

Background:

  • Central retinal artery occlusion (CRAO) is a critical condition leading to vision loss.
  • Understanding the time course of retinal damage is crucial for developing timely interventions.

Purpose of the Study:

  • To determine the retinal survival time following central retinal artery occlusion (CRAO) in a primate model.
  • To correlate the duration of CRAO with the extent of histopathological and electrophysiological damage.

Main Methods:

  • Transient CRAO was induced in 38 rhesus monkeys for durations ranging from 97 to 240 minutes.
  • Ophthalmic assessments included fundus photography, angiography, electroretinography (ERG), and visual evoked potentials (VEP).
  • Histological examination of retinal tissues was performed post-occlusion and follow-up.

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Main Results:

  • Retinal function, assessed by ERG and VEP, showed differential recovery rates based on occlusion duration.
  • Histological analysis revealed no significant damage at 97 minutes of CRAO, but increasing damage in inner retinal layers with longer occlusion times.
  • Damage was significant in the ganglion cell and inner nuclear layers, with no impact on photoreceptors or outer retinal layers.

Conclusions:

  • The retina of old, atherosclerotic, hypertensive rhesus monkeys is resilient to short CRAO (97 minutes).
  • Longer durations of CRAO result in progressively more extensive and irreversible retinal damage.
  • CRAO lasting approximately 240 minutes leads to substantial irreversible retinal injury.