*Table 26.
Vasospasm classification
| Artery: MCA | MFV (cm/s) | Lindegaard ratio |
|---|---|---|
| Mild | 120 to 130 | 3 to 6 |
| Moderate | 130 to 200 | 3 to 6 |
| Severe | > 200 | > 6 |
| Artery: ACA | > 50% of MFV in 24h | – |
| Artery: PCA | > 110 | – |
| Artery: VA | > 80 | – |
| Artery: basilar | Soustiel ratio | |
| Mild | 80 to 95 | 2 to 2.49 |
| Moderate | > 85 | 2.5 to 2.99 |
| Severe | > 115 | > 3 |
MCA: middle cerebral artery; ACA: anterior cerebral artery; PCA: posterior cerebral artery; VA: vertebral artery. Note: Lindegaard ratio is the ratio between the highest mean flow velocity (MFV) in the middle cerebral artery (M1) and MFV in the ipsilateral extracranial internal carotid. Soustiel ratio is the ratio between vertebral MFV and basilar MFV.