Diagnostic performance of multidetector row CT angiography compared with DSA in the detection of hemodynamically significant vasospasm (51%–100% of luminal narrowing) according to the anatomic district in 17 patients (251 segments)
| Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | DA (%) | P Value | |
|---|---|---|---|---|---|---|
| Proximal locations (ICA, M1, A1, P1, VA, and BA) | 94.7 | 99.2 | 94.7 | 99.2 | 98.7 | <.001 |
| Distal locations (A2, M2, P2, and their branches) | 100 | 96.3 | 87.5 | 100 | 97.1 | <.001 |
| Total | 97.5 | 98.1 | 90.7 | 99.5 | 98.0 | <.001 |
Note.— PPV indicates positive predictive value; NPV, negative predictive value; DA, diagnostic accuracy; ICA, internal carotid artery; M1, first segment of middle cerebral artery; M2, second segment of middle cerebral artery; A1, first segment of anterior cerebral artery; A2, second segment of anterior cerebral artery; P1, first segment of posterior cerebral artery; P2, second segment of posterior cerebral artery; VA, vertebral artery; BA, basilar artery.
Differences between proximal and distal locations are statistically nonsignificant.