Central Retinal Vein Occlusion

Central Retinal Vein Occlusion is a topic covered in the 5-Minute Emergency Consult.

To view the entire topic, please or .

Emergency Central is a collection of disease, drug, and test information including 5-Minute Emergency Medicine Consult, Davis’s Drug, McGraw-Hill Medical’s Diagnosaurus®, Pocket Guide to Diagnostic Tests, and MEDLINE Journals created for emergency medicine professionals. Explore these free sample topics:

-- The first section of this topic is shown below --

Basics

Description

Disease characterized by decreased visual acuity resulting from venous occlusion of any etiology

Etiology

  • Ischemic CRVO:
    • 20–25% of cases
    • Blocked venous return leads to backflow in capillaries, hemorrhage, and macular edema
    • Limited space at lamina cribrosa predisposes to thrombosis due to slow flow and vessel wall changes
    • Theorize that arteriosclerotic changes in the adjacent artery may impinge upon the vein
    • Blood viscosity also thought to play a role
  • Nonischemic CRVO:
    • Milder, incomplete occlusion

-- To view the remaining sections of this topic, please or --

Basics

Description

Disease characterized by decreased visual acuity resulting from venous occlusion of any etiology

Etiology

  • Ischemic CRVO:
    • 20–25% of cases
    • Blocked venous return leads to backflow in capillaries, hemorrhage, and macular edema
    • Limited space at lamina cribrosa predisposes to thrombosis due to slow flow and vessel wall changes
    • Theorize that arteriosclerotic changes in the adjacent artery may impinge upon the vein
    • Blood viscosity also thought to play a role
  • Nonischemic CRVO:
    • Milder, incomplete occlusion

There's more to see -- the rest of this entry is available only to subscribers.