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9 - Conventional carotid Doppler ultrasound

from Luminal imaging techniques

Published online by Cambridge University Press:  03 December 2009

By
Gregory Moneta
Edited by
Jonathan Gillard ,
Martin Graves ,
Thomas Hatsukami  and
Chun Yuan
Gregory Moneta
Affiliation:
Oregon Health and Science University, Portland, OR, USA
Jonathan Gillard
Affiliation:
University of Cambridge
Martin Graves
Affiliation:
University of Cambridge
Thomas Hatsukami
Affiliation:
University of Washington
Chun Yuan
Affiliation:
University of Washington
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Summary

Introduction

This chapter provides an overview of the traditional and evolving criteria used for grading carotid artery stenosis as well as the clinical relevance of sonography in the management of symptomatic and asymptomatic carotid disease. Additionally, discussions of carotid restenosis after endarterectomy as well as the diagnostic difficulties imposed by internal carotid coils and kinks, bilateral high-grade carotid stenosis and carotid stenting are included.

Technical points

Brachial systolic and diastolic blood pressures are measured in each arm. The carotid duplex ultrasound examination includes the carotid and vertebral arteries bilaterally, as stipulated by vascular laboratory accrediting organizations. Because the flow characteristics in one carotid artery may be influenced significantly by the status of the contralateral carotid artery, it is important to perform bilateral carotid examinations. A very high-grade stenosis or occlusion of one common or internal carotid artery can result in increased compensatory flow in the opposite vessel (Fujitani et al., 1992). The velocity readings in the patent artery therefore are higher than expected and may suggest a greater degree of stenosis than is actually present.

The ultrasound examination should include both longitudinal and transverse views of the vessels. Vessel diameter measurements, visual assessment of stenosis severity, and plaque assessments should be done in the transverse plane. Doppler waveforms should be generated from the longitudinal plane. Gray-scale images alert the examiner to the presence of plaque in the arterial wall, while changes in the hue of the color flow pattern suggest the presence of stenosis.

Type
Chapter
Information
Carotid Disease
The Role of Imaging in Diagnosis and Management
 , pp. 105 - 125
Publisher: Cambridge University Press
Print publication year: 2006

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References

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