Table 3. Consensus criteria on carotid ultrasound diagnostic criteria for >50% and >70% carotid stenosis.
| Publication | Grayscale imaging† | PSV (cm/s) | EDV (cm/s) | ICA-to-CCA PSV ratio | St Mary ratio§ | Prestenotic flow (CCA EDV) | Poststenotic flow disturbances | Collateral flow |
|---|---|---|---|---|---|---|---|---|
| >50% stenosis | ||||||||
| Grant et al. 2003 (29) | + | >125 | >40 | >2.0 | – | – | – | – |
| Oates et al. 2009 (43) | − | >125 | – | >2.0 | >8.0 | – | – | – |
| Arning et al. 2010 (45) | − | >200 | – | >2.0 | – | – | Moderate | Not present |
| von Reutern et al. 2012 (36) | + | >125 | – | >2.0 | – | – | Moderate | Not present |
| Jogenstrand et al. 2012 (46) | − | > 230 | – | – | – | – | – | – |
| Mozzini 2016 et al. (47) | − | >200 | – | >2.0 | – | – | – | – |
| >70% stenosis | ||||||||
| Grant et al. 2003 (29) | + | >230 | >100 | >4.0 | – | – | – | – |
| Oates et al. 2009 (43) | − | >230 | – | >4.0 | >14.0 | – | – | – |
| Arning et al. 2010 (45) | − | >300 | >100 | >4.0 | – | – | Present | Present |
| von Reutern et al. 2012 (36) | − | >230 | >100 | >4.0 | Reduced | Present | Present | |
| Jogenstrand et al. 2012 (46) | − | >320 | – | – | – | – | – | – |
| Mozzini 2016 et al. (47) | − | >300 | >100 | >4.0 | – | Reduced | – | – |
†, criteria mention features on grayscale B-mode imaging; §, St Mary ratio = ICA PSV/CCA EDV. CCA, common carotid artery; EDV, end diastolic velocity; ICA, internal carotid artery; PSV, peak systolic velocity.