Post on 07-May-2015
Fundus Fluorescein Angiography
Dr. Anand SudhalkarBaroda
Purpose Highlight retinal and choroidal
circulation Detect early vascular pathologies Confirm diagnosis
How does it work?CHARATERISTICS APPLICATIONS
Absorbs 465-490nm, emits 520-530nm
Binding to plasma proteins, esp Albumin
Selective visualization of its passage
Confined to natural blood retinal barrier
The sequence:PASSAGE OF DYE AFTER INJ. VISUALIZATION
10 to 15 sec : Short posterior ciliary arteries.
Choroidal flush, optic nerve head, cilioretinal artery.
11-18 sec: Retinal circulatiion, arteries-capillaries-veins.
20-25 sec: juxtrafoveal and perifoveal capillaries Maximal fluorescence around FAZ. The best time for PEAK PHASE IMAGING.
30 sec: First passage completed. Recirculation starts
After 10min: total disappearance of dye.
The InterpretationHYPO-FLUORESCENCE HYPER-FLUORESCENCE
Blocked: Media opacity, Hem
Vascular Filling Defects: Occlusions, capillary non perfusion
Autofluorescence Transmitted fluorescence Hyperfluorescence: 1. Abnormal
Vessels: Angiomas, Tumours
2. Leakage: NV, Plebitis
3. Pooling: CSR, PED 4. Staining: Disc,
drusen, chorioret. scar
Hypofluorescence
Vascular filling defects
Obstructions
Transmitted fluorescence
Blocked Fluorescence
Hyperfluorescence Vascular Leakage Pooling Staining
FFA reveals NV
FOCAL LEAKAGE