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

Subarachnoid hemorrhage of any thickness with intraventricular hemorrhage (IVH) or parenchymal extension. ¹⁾.

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.