W8: Imaging of Circulatory Disturbances

Question 1

Categories of Imaging

Answer 1

ANATOMICAL:
radiographs; mri/CT; catheter angio.; USS

FUNCTIONAL:
USS; radionucleotide (V/Q); MRI funct. img.

Question 2

Common problems with imaging

Answer 2

• METFORMIN: contrast dye disrupt renal funct. and cause lactic acidosis. should be witheld before CT
• asthma/atopic reaction to contrast
• AKI Pt.
• clotting disturbances
• thyroid metab. disruption.
• anaphylaxis

Question 3

USS Types

Answer 3

1. B MODE
   2D. commonest.
2. M MODE (MOTION)
   fixed plane over time. valve movement + chamber dimension and function
3. DOPPLER IMAGING
   flow alters frequency of waves => directionality and velocity
   * DVT detection

Question 4

Different Phases of CT

Answer 4

1. NON CONTRAST
   urinary tract calculi
   arterial calcification
2. ARTERIAL PHASE
   bleeding, aneurysm, stenosis/occl, liver mets
3. VENOUS PHASE
   hypovasc liver mets.
   abcess
   venous thromb.
4. NEPHROGENIC PHASE
   kidney tumour, trauma
5. DELAYED PHASE
   contrast wash except fibrotic tissue. MORE SPECIFIC liver tumours