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Table 6 Modified Fisher Scale [29]

From: Subarachnoid hemorrhage in the emergency department

Grade Criteria on CT head Incidence of Symptomatic Vasospasm
0 No SAH; no IVH 0%
1 Focal or diffuse, thin SAH; no IVH 24%
2 Thin, focal, or diffuse SAH; IVH 33%
3 Thick, focal, or diffuse SAH; no IVH 33%
4 Thick, focal, or diffuse SAH; IVH 40%
  1. CT Computed tomography, SAH Subarachnoid hemorrhage, IVH Intraventricular hemorrhage