Table 1.
Subject Demographics, and Vessel‐Level and Segmented Vascular Territory‐Level Comparison Between Digital Subtraction Angiography, CTA, and CTP T max
| Variable* | Population | DSA− group | DSA+ group | P value |
|---|---|---|---|---|
| Number of patients | 31 | 19 | 12 | |
| Age | 47.3±11.1 | 47.5±11.5 | 47.1±9.8 | 0.923 |
| Sex (women) | 23 (77%) | 11 (58%) | 12 (100%) | 0.008 |
| Race (White) | 16 (52%) | 10 (53%) | 6 (50%) | 0.890 |
| Hypertension | 20 (65%) | 10 (53%) | 10 (83%) | 0.087 |
| Diabetes | 2 (6%) | 1 (5%) | 1 (8%) | 0.745 |
| Coronary heart disease | 4 (13%) | 4 (21%) | 0 (0%) | 0.094 |
| Smoking | 15 (48%) | 7 (37%) | 8 (67%) | 0.113 |
| Artery † | 540 | 498 | 42 | |
| Internal carotid artery | 72 | 67 | 5 | |
| Middle cerebral artery | 144 | 130 | 14 | |
| Anterior cerebral artery | 144 | 123 | 21 | |
| Vertebral artery | 72 | 72 | 0 | |
| Basilar artery | 36 | 34 | 2 | |
| Posterior cerebral artery | 72 | 72 | 0 | |
| CTA vasospasm ‡ | 59 | 46 (9%) | 13 (31%) | 0.008 |
| CTP delay § | ||||
| T max>4 s | 177 | 149 (30%) | 28 (67%) | <0.001 |
| T max>6 s | 64 | 53 (11%) | 11 (26%) | 0.021 |
| T max>8 s | 42 | 35 (7%) | 7 (17%) | 0.058 |
| T max>10 s | 26 | 20 (4%) | 6 (14%) | 0.057 |
CTA indicates computed tomography angiography; CTP, computed tomography perfusion; DSA, digital subtraction angiography; and T max, tissue time‐to‐maximum.
*
Age presented as mean±SD. All other variables presented as number (percentage).
†
Values represent the number of arteries without or with DSA clinically important vasospasm.
‡
Moderate‐to‐severe or severe vasospasm on CTA corresponding to same degree of vasospasm in the same artery on DSA.
§
CTP delay in the arterial territory of vasospasm identified on DSA.