Are the left common carotid artery (CCA) velocity of 63 cm/s, internal carotid artery (ICA) velocity of 94 cm/s, and external carotid artery (ECA) velocity of 75 cm/s indicative of significant stenosis, and what treatment is recommended?

Normal Carotid Velocities - No Significant Stenosis Present

Based on these velocity measurements (CCA 63 cm/s, ICA 94 cm/s, ECA 75 cm/s), there is no hemodynamically significant carotid stenosis, and no intervention is indicated at this time.

Interpretation of Your Velocities

Your ICA peak systolic velocity of 94 cm/s falls well below the threshold for any significant stenosis. According to the 2011 ASA/ACCF/AHA guideline 1, 50-69% ICA stenosis requires PSV of 125-230 cm/s, and ≥70% stenosis requires PSV >230 cm/s. Your measurement of 94 cm/s is in the normal range.

Key Velocity Thresholds to Remember:

• Normal ICA: PSV <125 cm/s 1
• 50-69% stenosis: PSV 125-230 cm/s 1
• ≥70% stenosis: PSV >230 cm/s 1

Recent optimization studies suggest even higher thresholds may improve accuracy - one 2021 study found that raising the cutoff to PSV ≥180 cm/s for ≥50% stenosis improved specificity from 64% to 82% 2. Your velocity of 94 cm/s is far below even these more conservative thresholds.

Additional Supporting Parameters

The ICA/CCA ratio can be calculated from your values: 94/63 = 1.49. This is well below the threshold of 2.0 that indicates ≥50% stenosis 1, 2. The guideline specifies that 50-69% stenosis requires an ICA/CCA ratio between 2-4, and ≥70% stenosis requires a ratio >4 1.

Your ECA velocity of 75 cm/s is also normal. While ECA stenosis criteria are less standardized, research suggests that ECA PSV >148 cm/s indicates ≥50% ECA stenosis 3, which your measurement does not approach.

Clinical Recommendation

No intervention is needed. These velocities represent normal carotid hemodynamics. Continue standard cardiovascular risk factor management (blood pressure control, statin therapy if indicated, antiplatelet therapy if symptomatic, smoking cessation, diabetes management).

Common Pitfalls to Avoid:

• Don't confuse absolute velocity values with stenosis severity - velocities can be elevated in women, with contralateral occlusion, or with high cardiac output states 1
• The CCA velocity of 63 cm/s is normal; lower CCA velocities can actually predict downstream ICA stenosis when the CCA EDV drops below 19 cm/s 4, but your PSV is appropriate
• If there were calcification or technical limitations on the ultrasound report, correlation with CTA or MRA might be needed, but these velocities are clearly normal