Table 2. Predictive values of MFVs measured by TCD within the first 3 days for development of sVSP.
| Artery | Method (percentile) | MFV cut-off (cm/s) | Sensibility | Specificity | PPV | NPV | P |
|---|---|---|---|---|---|---|---|
| MCA | Youden’s Index | 74 | 0.71 | 0.73 | 0.85 | 0.71 | ≤0.01 |
| 50th | 64 | 0.83 | 0.60 | 0.60 | 0.83 | ≤0.01 | |
| 75th | 80 | 0.58 | 0.83 | 0.86 | 0.46 | ≤0.01 | |
| ACA | Youden’s Index | 64 | 0.71 | 0.87 | 0.89 | 0.67 | ≤0.01 |
| 50th | 49 | 0.83 | 0.63 | 0.63 | 0.83 | ≤0.01 | |
| 75th | 64 | 0.71 | 0.87 | 0.89 | 0.67 | ≤0.01 |
ACA, anterior cerebral artery; MCA, middle cerebral artery; MFV, mean flow velocity; NPV, negative predictive value; P, p-value; PPV, positive predictive value; sVSP, symptomatic vasospasm; TCD, transcranial Doppler sonography.