Fluorescein Angiography

Question 1

Which fluorescein for FFA

Answer 1

10% but can be up to 25%

Question 2

Excitation peak for fluorescein

Answer 2

490nm

Question 3

Emission peak for fluorescein

Answer 3

530nm

Question 4

What lesions are autofluorescent on FFA

Answer 4

Astrocytic hamartomas
Drusen

Large accumulation of lipofuscin

Question 5

What test for investigation choroidal vasculature

Answer 5

Indocyanine green ICG

As Fluorescein fluorescence from choroid reabsorbed by RPE

Question 6

Contraindication to FFA

Answer 6

Previous allergy to fluorescein
Breasfeeding
Kidney failure
Pregnancy

Question 7

CI to ICG

Answer 7

PRegnancy
Seafood allergy
Iodide allergy
Kidney failure
Liver disease

Question 8

Describe choroidal flow

Answer 8

Rapid

Arteriovenous phase occurs 1 to 2 seconds after arterial phase

Choriocapillaris is usually filled by AV phase or early venous phase

Choroidal phase is 8-12 secs after dye injection

Question 9

How long does AV phase last

Answer 9

1-2 seconds

Question 10

Why is diameter of retinal vessels on FFA larger than fundal photo

Answer 10

Plasma in periphery of vessels difficult to visualise in photo

Question 11

NVD fills in which stage

Answer 11

Early arterial phase