|
Stenosis Category (%) |
Peak Systolic Velocity cm/sec |
Peak Diastolic Velocity cm/sec |
Systolic Velocity Ratio ICA/CCA |
Diastolic Velocity Ratio ICA/CCA |
Spectral
Broadening |
|
0-5 |
<125 |
NA |
|
|
None |
|
5-15 |
<125 |
NA |
|
|
Diastole Only |
|
16-49 |
<125 |
|
|
|
Throughout |
|
50-79 (50-60) >60 (60-70) >70 (70-79) |
125-259 260-324 >325 |
<70 >70 >110 |
<3.2 3.2-4.0 >4.0 |
|
Throughout |
|
80-99 |
>125 |
>140 |
|
|
Throughout |
|
100 |
Absent |
Absent |
Absent |
Absent |
CCA flow to zero in diastole |