Degree of carotid artery stenosis and prevalence of intraplaque hemorrhage in asymptomatic-versus-symptomatic arteriesa
| Degree of Stenosisc | Prevalence of Intraplaque Hemorrhageb (%) | |||
|---|---|---|---|---|
| All (n = 449 Total) | Asymptomatic (n = 224 Total) | Symptomatic (n = 225 Total) | P Value | |
| <30% (n = 295 total) | 13/295 (4.4) | 3/180 (1.7) | 10/115 (8.7) | .02 |
| 30%–69% (n = 79 total) | 33/79 (41.8) | 5/19 (26.3) | 28/60 (46.7) | .18 |
| 70%+ (n = 75 total) | 25/75 (33.3) | 8/25 (32.0) | 17/50 (34.0) | .99 |
↵a P values pertain to the difference in the prevalence of IPH between asymptomatic and symptomatic groups and were calculated using the Fisher exact test. Data are number of arteries per group with intraplaque hemorrhage.
↵b Intraplaque hemorrhage was defined as being hyperintense on MPRAGE with intralesional signal intensity of >150% of the ipsilateral sternocleidomastoid muscle.
↵c Degrees of stenosis were based on the NASCET criteria.5