Doppler ultrasound of carotid arteries / Tips • Begin each scan on same side, usually the right • Avoid excess pressure on carotid bifurcation to avoid – Stimulate carotid sinus Bradycardia Syncope Ventricular asystole – Compress arteries to cause spurious high velocities Myers KA & Clough A. —76-year-old asymptomatic man with normal carotid and vertebral spectral tracings.Doppler sonogram shows external carotid artery that supplies high-resistance vascular beds of osseous and muscular structures of head and neck; thus, waveform is characterized by sharp rise in flow velocity during systole, rapid decline toward baseline, and diminished diastolic flow. These need to be taken into account when using it clinically. IAC vascular testing white paper on carotid stenosis interpretation criteria. General Background . Introduction The identification of carotid artery stenosis is the most common indication for cerebrovascular ultrasound. Visually and by Doppler criteria the estimated percent of stenosis in the left bulb is in the range of 16-49%. Up to 30% of all major hemispheric events (stroke,… Grant EG, Benson CB, Moneta GL, et al. The majority of stenotic lesions occur in the proximal internal carotid artery (ICA); however, other sites of involvement in the carotid system may or may not contribute to significant neurologic events. Duplex ultrasound modalities combine 2-dimensional real-time imaging with Doppler flow analysis to evaluate January 2014. Ultrasound is non-invasive, relatively accurate and relatively cheap. BACKGROUND . carotid artery (ECA). 1B. Screening for carotid artery stenosis by duplex scan in an asymptomatic individual is considered not medically necessary. Page Contents1 OVERVIEW2 KEY MEASUREMENTS MADE IN THE STUDY 3 CHARACTERIZING ICA STENOSIS: SOCIETY OF RADIOLOGISTS IN ULTRASOUND (SRU) CONSENSUS4 CHARACTERIZING ICA STENOSIS: THE NORTH AMERICAN SYMPTOMATIC CAROTID ENDARTERECTOMY TRIAL (NASCET INDEX). Fig. 2009 May;37(4):208-11. doi: 10.1002/jcu.20502. Making sense of vascular ultrasound. Doppler flow velocities in the left internal carotid artery are consistent with a <50% in the range of 16-49%. Grayscale and Doppler Ultrasound Diagnosis – Society of Radiologists (SRU) in Ultrasound Consensus Conference .” 1 . Velocity quantifications in the carotid ultrasound with Doppler angle set at 44 vs 60 degree (abstr). Appropriate test interpretation allows an initial clinical decision regarding medical treatment, intervention, or the need for additional cerebrovascular imaging. H istorically, IAC Vascular Testing has not required , endorsed, or referenced any specific diagnostic criteria for carotid stenosis interpretation in the ir Standards for Normal reference values of ratios of blood flow velocities in internal carotid artery to those in common carotid artery using Doppler sonography J Clin Ultrasound. Intersocietal Accreditation Commission Vascular Testing. Carotid duplex ultrasound is the recommended diagnostic test for symptomatic and asymptomatic patients with known or suspected extracranial carotid artery occlusive disease. However, carotid ultrasound has many pitfalls. It helps your healthcare provider determine if you are at risk of having a stroke and if she needs to prescribe preventative measures. 4 Tahmasebpour HR, Cooperberg PL, Segan-Hoffman J, et al. Carotid ultrasound is commonly used in the diagnosis and surveillance of carotid artery stenosis. Radiology 2003; 229:340–346. • dissection of the carotid and thoracic artery . Doppler flow velocities of the left external carotid artery are consistent with a … In: Radiological Society of North America scientific assembly and annual meeting program. The carotid Doppler test, or carotid ultrasound, is a non-invasive test that uses sound waves to detect narrowing of your arteries or potential blockages caused by plaque. 5 REFERECNES: OVERVIEW This page is dedicated providing useful information that can help aid in the interpretation of a carotid ultrasound … Carotid artery stenosis: grayscale and Doppler ultrasound diagnosis--Society of Radiologists in Ultrasound consensus conference.