Unit 3 - Angiography Flashcards

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1
Q

What do FFA’s look at?

A

Retinal vasculature

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2
Q

What do ICG images look at?

A

Choroidal blood flow

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3
Q

What wavelength excites NaF and what wavelength does it emit at?

A

Blue light (465-490)

Emits yellow-green (520-530)

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4
Q

What wavelength does ICG absorb and then emit?

A

Near IR range (790-805)

Fluoresces at (830nm)

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5
Q

What does NaF bind to?

A

Serum albumin

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6
Q

What does ICG bind to?

A

Proteins

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7
Q

What 6 risks are associated with FFA?

A

Hot flushes

Local erythema (sunburn)

Anaphylactic shock

Shortness of breath

Nausea

Vomiting

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8
Q

What 6 risks are associated with ICG?

A
  1. Hot flushes
  2. Local erythema (sunburn)
  3. Anaphylactic shock
  4. Shortness of breath
  5. Sore throat
  6. Urticaria
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9
Q

What contraindications are there to ICG and FFA?

A

Shellfish or iodine allergy

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10
Q

What % of NaF is used

A

20% intravenously

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11
Q

What dosage of ICG is used?

A

40mg in 2mL

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12
Q

What is the appearance of the disc in ICG and FFA?

A

FFA - light

ICG - dark

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13
Q

What type of pattern would you see in FFA with a scar?

A

Staining

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14
Q

What is the definition of FFA leakage?

A

Pattern that increases in size and intensity as the study continues.

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15
Q

What is the definition of FFA pooling?

A

Pattern that increases in intensity but not size e.g. PED

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16
Q

What causes are there of blocked FFA images?

A
  1. Cataract
  2. VH
  3. Retinal Haems
17
Q

What are the four phases of FFA and their times?

A
  1. Choroidal flush (8-12secs)
  2. Arteriovenous phase (11-18secs) Retinal arteries
  3. Lamellar venous phase ( 15-22secs) Retinal veins in lamellar patter
  4. Maximal flourescence (22-30 secs)
18
Q

What are the three phases of ICG and their times?

A

Early phase (0-3mins), choroid hyperflouresces Intermediate phase (3-10mins), maximal fluroscence Late phase (28-30 mins), large choroidal vessels appear dark against the bright stromal flourescence

19
Q

What does FAF look at?

A

Evaluation of RPE

20
Q

Which pigment causes autoflourscence?

A

lipofuscin

21
Q

What light is used to look at FAF?

A

Blue laser (488nm) observed using a 500nm filter.

22
Q

What do the optic disc and blood vessels look like in FAF?

A

Dark

23
Q

What does hypofluorescence in FAF indicate?

A

Reduced metabolic demand in RPE

24
Q

What does hyperfluorescence in FAF indicate?

A

Increased metabolic demand e.g.e inflammation

25
Q

What does increase flourescence at the edge of a dark area in FAF indicate?

A

Increasing GA

26
Q
A