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The continuity law states:
At the site of a >50% stenosis there are typically the following colour flow Doppler characteristics:
In presence of a stenosis of 50-69% the PSV is:
Velocity within a stenosis typically:
In presence of a stenosis > 70% the PSV is:
The peak systolic velocity ratio (PSVR) is a ratio derived from:
In presence of a stenosis > 90% but less than near occlusion the PSV is:
A stenosis graded 60-69% should have:
The percentage of stenosis (diameter reduction) within a haemodynamically significant ICA stenosis is calculated using:
The St Mary’s ratio is derived from:
A stenosis graded 70-79% should have:
A stenosis graded 50-59% should have: