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Carotid Duplex

Martin Necas 05 May 2003

Summary Ultrasound Features Pathology Other Modalities

Protocol Diagnostic Criteria Keywords References 1 Images 10 Show All

The following are ASUM recommended guidelines for the interpretation of carotid Duplex. Note, that %stenosis pertains to %diameter reduction.
0%…Normal waveform and no visible plaque
< 15%…Deceleration spectral broadening, PSV < 125 cm/sec
15 - 49%…Pansystolic spectral broadening, PSV < 125 cm/sec
50 - 69%…Pansystolic spectral broadening, PSV > 125 cm/sec and EDV < 110 cm/sec or ICA/CCA > 2
70 - 79%…Pansystolic spectral broadening, PSV > 270 cm/sec or
- EDV > 110 cm/sec or ICA/CCA > 4
80 - 99%…As above plus EDV > 140 cm/sec
100%…Occluded. No flow, possible terminal thump

Note: In case of unilateral ICA occlusion, the contralateral ICA velocities may demonstrate compensatory elevation. Over-estimation of the contralateral ICA disease may therefore occur.

The ASUM Online Clinical Handbook is presented as an educational aid for experienced practitioners. It is the responsibility of the individual practitioner to determine how the information should be applied to individual cases.

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