| Degree of MCA vasospasm | Mean flow velocity (cm/s) | Lindegaard ratio |
|---|---|---|
| Mild | 120–149 | 3–6 |
| Moderate | 150–199 | 3–6 |
| Severe | >200 | >6 |
| Degree of basilar artery vasospasm | Mean flow velocity (cm/s) | Sviri ratio |
| Vasospasm present | >70 | >2 |
| Moderate or severe | >85 | >2.5 |
| Severe | >85 | >3 |
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