Table 6.
Quantification of internal carotid artery stenosis (Department of Cardiovascular Imaging of the Brazilian Society of Cardiology)
| % Anat Dist St (Nascet) | PSV cm/s | EDV cm/s | PSV lC/ PSV CC | PSV IC / EDV CC | EDV IC / EDV CC |
|---|---|---|---|---|---|
| < 50% | < 140 | < 40 | < 2.0 | < 8 | < 2.6 |
| 50 to 59% | 140 to 230 | 40 to 69 | 2.0 to 3.1 | 8 to 10 | 2.6 to 5.5 |
| 60 to 69% | – | 70 to 100 | 3.2 to 4.0 | 11 to 13 | – |
| 70 to 79% | > 230 | > 100 | > 4.0 | 14 to 21 | – |
| 80 to 89% | – | > 140 | – | 22 to 29 | > 5.5 |
| > 90% | > 400 | – | > 5.0 | > 30 | |
| Subocclusion | Variable – thin flow | Variable – thin flow | Variable – thin flow | Variable – thin flow | Variable – thin flow |
| Occlusion | Lack of flow | Lack of flow | Not applicable | Not applicable | Not applicable |
The colors represent, from left to right, the most relevant criteria according to the literature. CC: common carotid; IC: internal carotid; EDV: end-diastolic velocity; PSV: peak systolic velocity.