Table 3.
SWiTCH brain MRI results by MRA vessel occlusion grading score
| MRA severity grade | ||||||
|---|---|---|---|---|---|---|
| Left hemisphere | Right hemisphere | |||||
| 0 | 1-3 | 4-6 | 0 | 1-3 | 4-6 | |
| Baseline | ||||||
| No. of subjects | 63 | 8 | 79 | 81 | 8 | 61 |
| Subcortical | 46 (73%) | 7 (88%) | 74 (94%)* | 60 (74%) | 7 (88%) | 51 (84%) |
| Cortical Infarct | 23 (37%) | 5 (63%) | 52 (66%)* | 19 (23%) | 3 (38%) | 34 (56%)* |
| Cortical and subcortical | 20 (32%) | 5 (63%) | 50 (63%)* | 18 (22%) | 3 (38%) | 31(51%)* |
| On study | ||||||
| Stroke | 1 (2%) | 0 | 2 (3%) | 1 (1%) | 0 | 3 (3%) |
| End of study | ||||||
| No. of subjects | 50 | 8 | 54 | 62 | 7 | 43 |
| Subcortical | 39 (78%) | 7 (88%) | 50 (93%) | 45 (73%) | 7 (100%) | 36 (84%) |
| Cortical Infarct | 21 (42%) | 4 (50%) | 34 (63%) | 17 (27%) | 3 (43%) | 24 (56%)* |
| Cortical and subcortical | 18 (36%) | 4 (50%) | 32 (59%) | 16 (26%) | 3 (43%) | 21 (49%)* |
Percentages represent the proportion of subjects with an MRI lesion for a given MRA vasculopathy grade range.
*
P < .05 using the χ2 test.