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Fig. 1C. —76-year-old asymptomatic man with normal carotid and
vertebral spectral tracings. Doppler sonography waveform of common carotid
artery represents amalgamation of flow profiles of internal carotid artery and
external carotid artery. Normally, common carotid artery waveform assumes
relatively low resistance character because of preponderance of carotid flow
entering internal carotid artery (
80%). Occasionally, transient flow
reversal may be seen in healthy people. Peak systolic velocities in common
carotid artery can be high in young patients with compliant vessels; such
velocities tend to decrease with age.
