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Chapter 3.4

ADMS 3502 Chapter Notes - Chapter 3.4: Angiography, Esophageal Cancer, Blood Vessel


Department
Administrative Studies
Course Code
ADMS 3502
Professor
Cristobal Sanchez- Rodriguez
Chapter
3.4

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CTA Spot Sign
-bleeds expand so stop bleeds right away tried drugs that thicken blood, see dyes
leaking out in bleed, and you see dye leaking out, that is actively bleeding, but if no dye
then patient less risk
-CTA “Spot Sign” give a dye while doing CT scan, so dye is radiolabelled, follows blood
vessels in brain so window in blood vessel to see where active bleed is, see contrast into
bleeding region so you see patient bleeding as we speak so act quickly ondye is good
to access caliber of all the blood vessels leading up to brain, have 4 vessels going to
brain and feeds into a circular structure and rest of brain fed off halo circle going up, so
we get atherlerosclerosis with one of these vessels, if you block one, each one went to
separate structure you are a goner, but circular structure if one is blocked, any of these
3 can feed circle and rest of brain is fed, elegant system for preventing disease and
morbidity and mortality just by structure, CTA CT angiogram, best modality looking at
these vessels, better than MR angiogram in quality, you want to act quickly, angiogram
takes too long and surgical procedure this is just give a dye and snap right away, 5-10
minutes, in setting of a stroke, 1.5 million brain cells die /minute, you want to open up
pipe as fast as you can, don’t want to wait for angiogram or MR angiogramcircle
which is the major vessel, caliber of the vessels see to back of brain
-now we have mathematical reconstruction filling backward, blocked, and get
retrograde filling of the dye from top so you know what you dealing with when using
these imaging modalities
-dye not getting across=clot so patient having a stroke
-CT is good at looking at tumors dye is useful in setting where blood brain barrier is
broken down, dye leaking out into damaged tissue, in setting of brain tumor
esophageal cancer that spreaded to brain, on a standard CT, some people can miss
that, but with contrast it sticks out, there is inflammation around there so how acute
that patient is in how fast it is growing same CT scanner, and run dye in with bit of
radiation through blood vessel and time it , and timing tells you how long it takes from
here and there and snap appropriately and see blood vessels appear and reconstruct it
and see what is going on with blood vessels you can also use this to measure how
closed off one of those arteries are, see how much plaque, >70% steonosis, only 30%
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