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12 Cards in this Set
- Front
- Back
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When is PRP indicated in BRVO?
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1. Chronic macular edema (>3 mo)
2. NVE or NVD (no role for prophylactic PRP) |
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What are the risk factors for BRVO?
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1. HTN
2. CAD 3. Inc BMI 4. POAG |
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Three conclusions of BVOS (Branch Vein Occlusion Study)
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1. Focal helps Chronic ME (> 3 mo) in pts w/ < 20/40
2. PRP prevents NV, but should wait until it develops (to avoid treating everybody) 3. Decreases risk of VH in pts w/ NV |
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Two conclusions of CVOS (Central Vein Occlusion Study)
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1. Focal doesn't work for ME (improved on IVFA only)
2. PRP does not prevent NVI (wait until it develops) |
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What is the etiology of CRAO?
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Atherosclerosis related thrombosis at lamina cribrosa.
Also emboli, heme under plaque, dissecting aneurysm, spasm, GCA, carotid dz |
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What has aching orbital/face pain that improves when lying down?
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Ocular ischemic syndrome
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What does CRAO ERG show?
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Decreased b-wave
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What does OIS ERG show?
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Decreaased a- & b-waves (due to outer & inner layer retinal ischemia)
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What does a-wave represent on ERG?
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Negative waveform, Photoreceptor function
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What does b-wave represent on ERG?
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Positive waveform, Inner retinal layer function (Mainly Inner Nuclear Layer from Bipolar & Muller cells)
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What does ophthalmodynamometry show for OIS? For CRVO?
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Low ophthalmic artery pressure in OIS, normal/high in CRVO
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How much obstruction of carotid before doing endarterectomy?
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Operate if 70-99% obstruction and symptomatic (NASCET trial)
Only mod benefit in 50-69% Don't if 0-29% (antiplatelet better) |
