Fisher scale
Neurology
Also known as: Fisher grade · Fisher-Skala (original) · Fisher-Klassifikation · Fisher skalası · Fisher scale (original, CT blood in subarachnoid haemorrhage)
What it is for
Fisher scale (original): amount and distribution of blood on the first CT after aneurysmal subarachnoid haemorrhage (SAH), designed to estimate the likelihood of cerebral vasospasm.
Classification
| Category | Description |
|---|---|
| Grade 1 | no blood detected. |
| Grade 2 | diffuse thin layer of subarachnoid blood (vertical layers under 1 mm), no clots. |
| Grade 3 | localised clot and/or vertical layers of blood 1 mm or thicker. |
| Grade 4 | intracerebral or intraventricular blood, with diffuse or no subarachnoid blood. |
| Note | in the original scale grade 3, not grade 4, carried the highest vasospasm association; the modified Fisher scale was developed partly for this reason. State which scale is meant. |
Source
Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning
Neurosurgery 1980;6:1–9 (Fisher CM, Kistler JP, Davis JM)
DOI: 10.1227/00006123-198001000-00001
PMID: 7354892
- Edition
- Fisher 1980 (original 4-grade CT scale); the modified Fisher scale (2006) is a separate scale
- Checked on
Summary of the published classification in our own words. Not a substitute for the original publication.
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