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Fig 2. Percent diameter stenosis in carotid arteries over time, as determined by sonography evaluation (core laboratory analysis). prox, proximal; dist, distal. The following criteria were used for determination of %DS: PSV (peak systolic velocity) 
125 cm/s: <49% DS; PSV > 125 cm/s and EDV (end diastolic velocity) 140 cm/s: 50%–79% DS; PSV > 125 cm/s and EDV > 140 cm/s: 80%–99% DS; no flow in ICA: 100% DS.
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