Sensitivity, specificity (95% confidence limits in parentheses), positive predictive value, negative predictive value, and accuracy of MSCTA in the characterization of intracranial vasospasms at the level of the distal internal carotid artery and the intracranial cerebral arteries
| Vasospasm Grade | True-Positive | False-Positive | False-Negative | True-Negative | Sensitivity (%) | Specificity (%) | Accuracy (%) | Positive Predictive Value (%) | Negative Predictive Value (%) |
|---|---|---|---|---|---|---|---|---|---|
| Mild-Moderate | |||||||||
| Distal ICA | 3 | 0 | 6 | 34 | 33.3 (64–3) | 100 | 86 | 100 | 85 |
| Intracranial cerebral arteries | 33 | 6 | 5 | 183 | 86.8 (76–98) | 96.8 (94–99) | 95.2 | 84.6 | 97.3 |
| Severe | |||||||||
| Distal ICA | 2 | 0 | 0 | 34 | 100 | 100 | 100 | 100 | 100 |
| Intracranial cerebral arteries | 13 | 1 | 4 | 183 | 76.5 (57–96) | 99.5 (98–100) | 97.5 | 92.9 | 97.9 |
Note:—MSCTA indicates multisection CT angiography; ICA, internal carotid artery.