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Assessment for vasospasm using the mean flow velocity of the MCA and the Lindegaard ratio.17
| Mean flow velocity (cm/s) | Lindegaard ratio | Interpretation of findings |
|---|---|---|
| <120 | ≤3 | Hyperemia only |
| >80 | 3–4 | Hyperemia plus possible mild |
| spasm | ||
| ≥120 | 3–4 | Hyperemia plus mild spasm |
| ≥120 | 4–5 | Hyperemia plus moderate spasm |
| ≥120 | 5–6 | Moderate spasm |
| ≥180 | 6 | Moderate to severe spasm |
| ≥200 | ≥6 | Severe spasm |
| ≥200 | 4–6 | Hyperemia plus moderate spasm |
| ≥200 | 3–4 | Hyperemia plus mild or residual spasm |
| ≥200 | <3 | Hyperemia only |
