Table 4.
Summary of CT Angiography category and grading results.
| Summary of CT Angio peripheral extremities: size (grade) and number (category) of collaterals vessels | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Collateral vessel grade [n (%)]∗ | Mean (SD) | Collateral vessel category [n (%)]∗∗ | Mean (SD) | |||||||
| Grade 0 | Grade 1 | Grade 2 | Grade 3 | Category 0 | Category 1 | Category 2 | Category 3 | |||
|
| ||||||||||
| Proximal thigh | ||||||||||
| Preintervention | 9 (64.3) | 1 (7.1) | 0 | 2 (14.3) | 0.58 (1.165) | 9 (64.3) | 1 (7.1) | 2 (14.3) | 0 | 0.42 (0.793) |
| Postintervention | 7 (50.0) | 1 (7.1) | 1 (7.1) | 3 (21.4) | 1.00 (1.348) | 7 (50.0) | 2 (14.3) | 2 (14.3) | 1 (7.1) | 0.75 (1.055) |
| Mid thigh | ||||||||||
| Preintervention | 7 (50.0) | 3 (21.4) | 2 (14.3) | 0 | 0.58 (0.793) | 7 (50.0) | 3 (21.4) | 2 (14.3) | 0 | 0.58 (0.793) |
| Postintervention | 5 (35.7) | 2 (14.3) | 3 (21.4) | 2 (14.3) | 1.17 (1.193) | 5 (35.7) | 3 (21.4) | 0 | 4 (28.6) | 1.25 (1.357)# |
| Distal thigh | ||||||||||
| Preintervention | 8 (57.1) | 4 (28.6) | 0 | 0 | 0.33 (0.492) | 8 (57.1) | 3 (21.4) | 1 (7.1) | 0 | 0.42 (0.669) |
| Postintervention | 4 (28.6) | 2 (14.3) | 4 (28.6) | 2 (14.3) | 1.33 (1.155)# | 4 (28.6) | 3 (21.4) | 1 (7.1) | 4 (28.6) | 1.42 (1.311)# |
| Proximal leg | ||||||||||
| Preintervention | 10 (71.4) | 2 (14.3) | 0 | 0 | 0.17 (0.389) | 10 (71.4) | 1 (7.1) | 1 (7.1) | 0 | 0.25 (0.622) |
| Postintervention | 5 (35.7) | 3 (21.4) | 2 (14.3) | 2 (14.3) | 1.08 (1.165)# | 5 (35.7) | 2 (14.3) | 4 (28.6) | 1 (7.1) | 1.08 (1.084)# |
| Mid leg | ||||||||||
| Preintervention | 10 (71.4) | 1 (7.1) | 1 (7.1) | 0 | 0.25 (0.622) | 10 (71.4) | 0 | 2 (14.3) | 0 | 0.33 (0.778) |
| Postintervention | 8 (57.1) | 3 (21.4) | 1 (7.1) | 0 | 0.42 (0.669) | 8 (57.1) | 1 (7.1) | 2 (14.3) | 1 (7.1) | 0.67 (1.073) |
| Distal leg | ||||||||||
| Preintervention | 10 (71.4) | 1 (7.1) | 1 (7.1) | 0 | 0.25 (0.622) | 10 (71.4) | 0 | 1 (7.1) | 1 (7.1) | 0.42 (0.996) |
| Postintervention | 10 (71.4) | 1 (7.1) | 1 (7.1) | 0 | 0.25 (0.622) | 10 (71.4) | 0 | 1 (7.1) | 1 (7.1) | 0.42 (0.996) |
# p < 0.05: values are statistically significant compared to preintervention.
∗Collateral vessel grading is a system used to quantify the size of the collateral vessels formed as follows:
Grade 0: no collateral vessels.
Grade 1: ≤5 small.
Grade 2: >5 small.
Grade 3: ≤5 large ± small.
Grade 4: >5 large ± small.
∗∗Collateral vessel category is a system used to quantify the number of collateral vessels present as follows:
Category 0: no collateral vessels.
Category 1: 1–3 collateral vessels.
Category 2: 4–7 collateral vessels.
Category 3: ≥8 collateral vessels.