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Assessment for vasospasm using the mean flow velocity in the basilar artery and the Sviri ratio.17
| Mean flow velocity (cm/s) | Sviri ratio | Interpretation of findings |
|---|---|---|
| >70 | > 2 | Vasospasm |
| >85 | >2.5 | Moderate or severe vasospasm |
| >85 | >3 | Severe vasospasm |
