Per patient analysis of flow pattern, and the presence or absence of collaterals on the side of the dominant jugular vein (or bilateral, if codominant)
| Overall (n = 108) | Collaterals Present | No Collaterals Present | |
|---|---|---|---|
| No stenosis bilaterally | 35 (32.4%) | ||
| Mild or moderate stenosis of nondominant jugular vein | 24 (22.2%) | ||
| Moderate stenosis of dominant jugular vein | 31 (28.7%) | 11/31 (35.5%) | 20/31 (64.5%) |
| Severe stenosis of dominant jugular vein | 18 (16.7%) | 10/18 (55.6%) | 8/18 (44.4%) |