Carotid artery stenosis

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Contents

[edit] Discussion of Carotid artery stenosis

[edit] Imaging Findings for Carotid artery stenosis

[edit] Ultrasound Criteria for Carotid Artery Stenosis

  • Normal:
    • ICA PSV is less than 125 cm/sec and no plaque or intimal thickening is visible sonographically.
    • Additional criteria include ICA/CCA PSV ratio < 2.0 and ICA EDV < 40 cm/sec.
  • <50% ICA stenosis:
    • ICA PSV is less than 125 cm/sec and plaque or intimal thickening is visible sonographically.
    • Additional criteria include ICA/CCA PSV ratio < 2.0 and ICA EDV < 40 cm/sec.
  • 50%–69% ICA stenosis:
    • ICA PSV is 125–230 cm/sec and plaque is visible sonographically.
    • Additional criteria include ICA/CCA PSV ratio of 2.0–4.0 and ICA EDV of 40–100 cm/sec.
  • >=70% ICA stenosis but less than near occlusion
    • ICA PSV is greater than 230 cm/sec and visible plaque and luminal narrowing are seen at gray-scale and color Doppler US (The higher the Doppler parameter lies above the threshold of 230 cm/sec, the greater the likelihood of severe disease).
    • Additional criteria include ICA/CCA PSV ratio > 4 and ICA EDV > 100 cm/sec.
  • Vear occlusion of the ICA:
    • Velocity parameters may not apply, since velocities may be high, low, or undetectable.
    • Diagnosis is established primarily by demonstrating a markedly narrowed lumen at color or power Doppler US (35).
  • Total occlusion of the ICA
    • No detectable patent lumen at gray-scale US and no flow with spectral, power, and color Doppler US.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References for Carotid artery stenosis