Venous Occlusive Disease Flashcards
Cause of Venous Occlusions
atherosclerosis of artery causes it to push down on vein
Risk factors for venous occlusions
older than 65 hypertension hyperlipidemia oral contraceptives increased IOP
Central Retinal Vein Occlusion
caused by thrombus formation behind lamina cribosa
ischemic or non-ischemic
Non-Ischemic CRVO
more common, less severe
can convert to ischemic
Ischemic CRVO
less common, more severe
Distinguishing from Ischemic and Non-Ischemic CRVO
fluoroscein angiography
light - non
dark - ischemic
Presentation of Non-Ischemic CRVO
sudden painless loss of vision- 20/200 APD absent or mild dilated, tortuous veins hemorrhages cotton wool spots and edema of macula
Long Term Effects of CRVO
most acute signs resolve within a year
collateral vessels can appear on optic disc
Prognosis for Non-Ischemic CRVO
Vision returns to normal in half of patients
continued poor vision is due to macular edema
Presentation of Ischemic CRVO
sudden painless loss of vision - CF
APD obvious
Prognosis of Ischemic CRVO
vision stays very poor due to macular ischemia
half of patients get NVI- neovascularization of iris
Managing CRVO
address systemic cardiovascular concerns
FA- non - FU 3 mo; ischemic - FU monthly for 6 mo
look for NVI/ NVG before dilation
Branch Retinal Vein Occlusion
acute blockage of branch retinal vein
more common than CRVO
Symptoms of BRVO
sudden painless blurred/ distorted vision if macula effected
may be asymptomatic if macula unaffected
Acute Signs of BRVO
venous dilation and tortuosity of affected section of retina
flame and dot/blot hemorrhage
retinal edema, cotton wool spots
