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Middle cerebral artery criteria of angiographic vasospasm by transcranial Doppler ultrasonography
| Mean flow velocity (cm/second) | Hemispheric ratio (Lindegaard ratio) | |
|---|---|---|
| Normal values | 35 to 89 | <3 |
| Above normal values | 90 to 119 | – |
| Mild vasospasm | 120 to 150 | 3 to 4 |
| Moderate | 150 to 199 | 4 to 5.9 |
| Severe | ≥200 | ≥6 |
