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Table 4: 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.