imaging of circulatory disturbances Flashcards
what are the different types of vascular iimaging?
plain films
contrast angiography
ultrasound CT/MRI
what are the problems with vascular imaging?
soft tissue contrast
functional significance of lesions
what can you not see very well on a radiographic contrast ?
blood vessels
lumen of hollow viscera
what are problems with iodinated contrast?
major reactions renal dysfunction disturbances of thyroid metabolism disturbances of clotting seizures pulmonary oedema
what is catheter angiography?
vessel punctured and catheterised
sterile procedure
contrast injected using pump injector
rapid series of images required
what treatments is interventional radiology?
angiography/angioplasty embolisation catheter thrombolysis drainage of abscesses nephrostomy vertebroplasty
when to use angioplasty?
short stenosis or occlusions
sessile/ concentric
when is a negative contrast agent useful?
in patients with poor renal function or sensitivity to iodinated contrast agents
what are problems with angioplasty?
occlusion dissection embolisation rupture infection
what are pros and cons of ultrasound?
no radiation dose
quick
non invasive
operator dependent
what are the pros and cons of nuclear medicine?
pros
IV injection only
good patient compliance
easy to arrange
cons
radiation dose
very insensitive
very non-specific
pros and cons of computed tomography angiogram?
pros
gives information about other structures
sensitive
IV injection only
cons
radiation dose
high contrast dose
expensive
pros and cons of magnetic resonance angiography?
pros sensitive specific no radiation no nephrotoxic contrast
cons
very expensive
needs state of the art machinery
high contrast cost
