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🧠 Modified Fisher Scale (SAH Vasospasm Risk)

UsePredict symptomatic vasospasm from the CT bleed pattern.

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SourceFrontera JA, et al. Neurosurgery 2006

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Scene next step
📋sah aneurysmOpen scene pack →
Related scores
Matching pathway
🧭sahOpen pathway →
Score + version; reference only — not a substitute for care · no HIS write

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Methodology · worked example, guidelines & full notes
Clinical takeaway

Thick cisternal blood plus IVH carries the highest risk.

When to use

Predict symptomatic vasospasm from the CT bleed pattern.

How it works

Grades 0–4 based on thickness of subarachnoid blood and presence of intraventricular haemorrhage. Higher grades carry higher vasospasm risk.

Key points

  • Thick cisternal blood plus IVH carries the highest risk.
  • Guides intensity of vasospasm surveillance.
  • Complements clinical grading scales.

References

Worked calculation

The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.

CT appearance2 — Thin SAH with IVH

→Modified Fisher2/4

  • Approx. symptomatic vasospasm risk：~21%
CT appearance0 — No SAH or IVH

→Modified Fisher0/4

  • Approx. symptomatic vasospasm risk：~0%
Verification & sources · governance
FAQ

Frequently asked questions

What are the limits and cautions when using Modified Fisher Scale (SAH Vasospasm Risk)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
Does Modified Fisher Scale (SAH Vasospasm Risk) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Modified Fisher Scale (SAH Vasospasm Risk) calculated in practice? Can you show a worked example?
Inputs: CT appearance 2 — Thin SAH with IVH → Result: Modified Fisher 2 /4（Approx. symptomatic vasospasm risk: ~21%） Inputs: CT appearance 0 — No SAH or IVH → Result: Modified Fisher 0 /4（Approx. symptomatic vasospasm risk: ~0%）
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