Stroke & Interventional Radiology Flashcards

1
Q

“Density” vs. “Hypodensity” on CT/MRI

A
  • Hypodensity: Dark
  • Dense: Light
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Appearance of infarcts on CT

A
  • Confined to a vascular territory
  • 1-6 hours loss of gray matter density
  • 6 hours - 4 days: progressive swelling and hypodensity
  • 4 -14 days: return towards normal density and volume
  • 14 days on: varying degrees of hypodensity and volume loss
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Appearance of infarcts on MRI

A
  • 1 hour – 10 days: bright on diffusion weighted imaging
  • Swelling and increased signal on FLAIR and T2-weighted scans follows same pattern as swelling ang and low density on CT
  • DWI great for small infarcts and telling new from old
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Usefull CT scans in workup of acute infarcts

A
  • Non-contrast CT scan ==>
  • CT perfusion scan ==>
  • head and neck angiogram
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Benefits of using CT scans in workup of acute infarcts

A
  • CT is fast
  • MRI has size restrictions + can’t be used on people with metal implants
    • No pt.s are excluded from CT scanner
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Perfusion CT procedure + information provided

A
  • give bolus of contrast, see timing of bolus to get to different locations at the brain.
  • High dose radiation study, lots of contrast and continuous exposure for 1 minute.
  • Results = cerebral blood volume and time to start/time to peak maps.
    • Used in qualitative manner.
    • Look for delays in time to start/peak.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

CT Angiogram procedure + results information

A
  • IV contrast bolus and take thin sections through anatomy
  • look for arteries that may be the cause of the infarction
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Tx of acute infarcts

A
  • IV thrombolytics, stent/catheter
  • Primary/secondary prevention: treat HTN, DM, hypercholesterolemia
  • Tertiary treatment → reducing long term effects of acute stroke
How well did you know this?
1
Not at all
2
3
4
5
Perfectly