Fisher scale [Neurosurgery Wiki]

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====== Fisher scale ======

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The Fisher scale is used to assess the amount of blood visible on a CT scan following subarachnoid hemorrhage. Higher Fisher grades are associated with a worse prognosis and increased mortality.


1	

No hemorrhage is evident.

2	

Subarachnoid hemorrhage less than 1mm thick.

3	

Subarachnoid hemorrhage is more than 1mm thick.

4   

{{fisher4.jpg|}}    

Subarachnoid hemorrhage of any thickness with [[intraventricular hemorrhage]] (IVH) or parenchymal extension.
((Fisher C, Kistler J, Davis J ([[1980]]). "Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning". Neurosurgery 6 (1): 1–9.)).

===== Modified Fisher Grading Scale for Subarachnoid Hemorrhage =====

see [[Modified Fisher Grading Scale for Subarachnoid Hemorrhage]]

Elderly patients, and especially the subgroup with a [[Fisher Scale]] 3 bleeding pattern, had a high risk for an unfavorable outcome, whereas the subgroup of Non [[perimesencephalic subarachnoid hemorrhage]] NPM-SAH without a Fisher Grade 3 bleeding pattern had a favorable outcome, similar to [[perimesencephalic subarachnoid hemorrhage]] (PM)-SAH.