CT Neurosurgery

Card Set Information

Author:
mbrieger
ID:
95476
Filename:
CT Neurosurgery
Updated:
2011-07-27 21:45:42
Tags:
CT Neurosurgery
Folders:

Description:
CT Neurosurgery
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user mbrieger on FreezingBlue Flashcards. What would you like to do?


  1. Most rapid form of CT
    Multislice helical
  2. types of ct
    • Multislice helical
    • Single slice helical
    • Multislice serial
    • High Resolution Computed Tomography
  3. HRCT might miss
    small masses because fewer slices are taken at higher resolution
  4. the more X-rays pass through a structure
    the darker it appears
  5. CT vantage point
    • view up ward from pts feet
    • pts rt is views left
  6. white matter on CT
    darker then grey matter due to fat content
  7. Units of intensity in CT
    Hounsfields
  8. Order of intensity of tissue from least to greatest
    • Air -1000
    • Fat -100
    • Water 0
    • Tissue 100
    • Calcium 200
    • Bone 1000
    • Dense Bone 3000
    • Metal
  9. Makes contrast bright on imaging
    iodine
  10. iodinated contrast on CT allows visualization of
    veins and arteries
  11. Original contrast was more toxic because it was
    ionic
  12. 2 major side effects of contrast
    • nephropathy
    • anaphylactoid reaction
  13. Falsely associated with iodine allergy
    seafood, topical iodine containing antiseptics
  14. Pretreatment for relative contraindication due to allergy
    • corticosteroids
    • anti-histamine
  15. Contrast induced nephropathy
    increase in serum cr by 25% or 0.5mg/dl or more
  16. Risk factors for nephropathy
    • preexisting renal insufficiency
    • diabetes
    • reduced intravascular volume
  17. used to reduce risk of contrast induced nephropathy
    • non-ionic contrast
    • hydrate pt well
    • bicarb before and after scan
    • N-acetylcysteine
    • prophylactic hemodialysis
    • schedule contrast inhanced CT before dialysis
  18. CT of Head w/o contrast is used to
    • diagnose CVA and ICH
    • assess hydrocephalus, mass effect, herniation, skull fracture, sinus disease
  19. CT with contrast is used to diagnose
    tumors BUT MRI is more sensitive
  20. types of hemorrhagic stroke
    • epidural
    • subdural
    • subarachnoid
    • intracerebral
  21. Epidural hematoma
    etiology
    shape
    • laceration of middle meningeal artery
    • obey suture lines, lens shaped
  22. Subdural hematoma
    etiology
    shape
    • laceration of bridging veins
    • do not obey suture lines, wavy appearance against brain surface
  23. Subarachnoid hemorrhage
    etiology
    shape/location
    • ruptured aneuyrsm 85% mostly in anterior circle of willis
    • bleed in space between arachnoid and pia into CSF
    • - midline bleeding - ACA ruptured aneursm
    • - bleeding around ponds or midbrain - smile
  24. Subarachnoid hemorrhage diagnostic
    After dx on CT then Cerebral angiography
  25. intracerebral hemorrhages etiology
    • hypertension typically affecting deep structures
    • - pons
    • - thalamus
    • - putamen
    • amyloid angiopathy typically superficial areas
    • - cortex
    • - white mater
  26. interacerebral hemorrhages are typically located
    intraparenchymal
  27. hydrocephalus
    • abnormal CSF accumulation
    • obstructive vs. communicating
  28. Communicating HCP on CT
    Will show sharper angles on ventricles
  29. Obstructive HCP on CT
    Ventricles will have rounder angles
  30. types of herniation
    • subfalicial (cingulate) - midline shift
    • uncal - laterally through tentorium downward
    • central or transtentorial - centrally downward
    • external - out of skull
    • tonsillar herniation - through foramen magnum
  31. tPA
    • given for ischemic stroke
    • within 3 hrs of presentation
    • but hemorragic stroke must be ruled out by CT
  32. major complication of tPA
    hemorrhage
  33. contraindications to tPA
    • active internal bleeding
    • platlets <100
    • pt on heparin or warfarin
  34. Intracranial hemorrhage managment
    • neurosurgical consult
    • strict BP control
  35. ischemic stroke presentation on noncontrast ct after 24hrs
    • disappearing gray-white junction
    • hyperdense MCA sign
    • obliteration of sulci
    • shifting due to edema
    • hypoattenuation of lentiform nucleus
    • insular ribbon sign

What would you like to do?

Home > Flashcards > Print Preview