Table 2.
Baseline comparisons between stenosis groups, using traditional definition of full collapse
| Missing data | Conventional ≥ 50% stenosis (n = 315) | Near-occlusion without full collapse (n = 69) | Near-occlusion with full collapse (n = 47) | pa | ||
|---|---|---|---|---|---|---|
| Age meanb (SD) | 0 | 72 (8) | 70 (9) | 70 (8) | 0.02 | |
| Womenb n (%) | 0 | 96 (30) | 19 (28) | 16 (34) | 0.77 | |
| Myocardial infarctionb n (%) | 1 | 65 (21) | 12 (17) | 6 (13) | 0.40 | |
| Symptomatic peripheral artery diseaseb n (%) | 1 | 25 (8) | 8 (12) | 3 (6) | 0.56 | |
| Current anginab n (%) | 2 | 50 (16) | 7 (10) | 6 (13) | 0.48 | |
| Heart failureb n (%) | 2 | 21 (7) | 3 (4) | 2 (4) | 0.68 | |
| Current smokerb n (%) | 3 | 51 (16) | 16 (23) | 9 (19) | 0.39 | |
| Diabetesb n (%) | 1 | 78 (25) | 18 (26) | 9 (19) | 0.68 | |
| Hypertension† n (%) | 1 | 289 (92) | 56 (81) | 42 (89) | 0.02 | |
| Previous arterial revascularizationb,c n (%) | 1 | 68 (22) | 11 (16) | 9 (19) | 0.54 | |
| Type of presenting event | Afx | 0 | 33 (10) | 13 (20) | 3 (6) | 0.16 |
| RAO | 16 (5) | 2 (3) | 1 (2) | |||
| TIA | 117 (37) | 28 (41) | 15 (32) | |||
| Stroke | 149 (47) | 26 (38) | 28 (60) | |||
| Sought medical attention on day of presenting event n (%) | 0 | 232 (74) | 44 (64) | 34 (72) | 0.26 | |
| Delay presenting event—CTA median (IQR) | 0 | 3 (1–7) | 5 (2–15) | 4 (1–14) | 0.03 | |
| Delay presenting event—ultrasound median (IQR) | 93d | 6 (3–12) | 7 (4–16) | 9 (5–18) | 0.15 | |
| Underwent revascularizatione n (%) | 0 | 209 (66) | 55 (78) | 13 (28) | < 0.001 | |
| Delay presenting event—revascularization median (IQR) | 0 | 10 (7–21) | 13 (7–24) | 18 (9–29) | 0.12 | |
| Stenosis diameter mm mean (SD) | 11f | 1.4 (0.5) | 0.8 (0.3) | 0.7 (0.3) | < 0.001 | |
| Distal ICA diameter mm mean (SD) | 0 | 4.2 (0.6) | 2.9 (0.5) | 1.1 (0.8) | < 0.001 | |
| ICA-ratio mean (SD) | 16 g | 1.00 (0.26) | 0.64 (0.11) | 0.30 (0.28) | < 0.001 | |
| ECA ration mean (SD) | 0 | 1.64 (0.40) | 1.08 (0.47) | 0.40 (0.29) | < 0.001 | |
| Stenosis PSV m/s mean (SD) | 93d | 2.9 (1.4) | 3.7 (1.7) | 2.2 (2.4) | < 0.001 | |
Afx amaurosis fugax, CTA computed tomography angiography, ECA external carotid artery, ICA internal carotid artery, IQR interquartile range, PSV peak systolic velocity, RAO retinal artery occlusion, SD standard deviation, TIA transient ischemic attack
aχ2-test, one-way ANOVA, and Kruskal–Wallis
bUsed as co-variate in the step-wise removal multivariable analysis
cCoronary, carotid, or leg artery interventions
d84 had no ultrasound exam and 9 had echo shadow. 31 were among near-occlusions
eCarotid endarterectomy or angioplasty with stenting
f7 were among near-occlusions, caused by severe calcification
g4 were among near-occlusions, caused by contralateral occlusion