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Differentiating subtotal carotid artery stenoses from occlusions by colour-coded duplex sonography

M Görtler1, R Niethammer, B Widder

  • 1Neurologische Universitätsklinik, Ulm, Germany.

Journal of Neurology
|March 1, 1994
PubMed
Summary

Colour-coded duplex sonography accurately differentiates severe carotid artery stenosis from occlusion. This non-invasive technique is comparable to angiography, offering a superior alternative to conventional Doppler methods for diagnosing extracranial carotid artery disease.

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Area of Science:

  • Vascular Ultrasound
  • Cerebrovascular Imaging
  • Medical Diagnostics

Background:

  • Accurate differentiation between subtotal carotid artery stenosis and occlusion is critical for patient management.
  • Conventional Doppler and duplex ultrasonography have limitations in assessing severe carotid artery disease.
  • X-ray angiography is invasive and carries associated risks.

Purpose of the Study:

  • To evaluate the efficacy of colour-coded duplex sonography in differentiating subtotal internal carotid artery stenoses from occlusions.
  • To compare the diagnostic performance of colour-coded duplex sonography with conventional Doppler/duplex techniques and X-ray angiography.

Main Methods:

  • Prospective investigation of 2420 consecutive patients over 9 months.
  • Carotid arteries assessed using conventional Doppler, duplex ultrasonography, and colour-coded duplex sonography.

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  • Comparison with X-ray angiography findings for 131 internal carotid arteries with ≥95% diameter reduction.

    • Main Results:

    • Colour-coded duplex sonography identified 'distal colour filling' in all 25 subtotal stenoses but none of the 106 occlusions.
    • 'Distal colour filling' was defined by specific criteria including a 1.5 cm continuous colour signal distal to the stenosis.
    • Colour-coded duplex sonography demonstrated superior performance compared to conventional techniques and was comparable to angiography.

    Conclusions:

    • Colour-coded duplex sonography is a highly effective non-invasive tool for distinguishing subtotal carotid artery stenoses from occlusions.
    • This advanced ultrasound technique offers diagnostic accuracy comparable to invasive angiography.
    • Colour-coded duplex sonography represents an improvement over conventional Doppler and duplex methods for evaluating severe carotid artery disease.