SAH Fisher Grade
The Fisher grading scale classifies the appearance of subarachnoid hemorrhage on CT scan and is used in predicting cerebral vasospasm.
The development of clinical vasospasm within each grade has been reported as follows:
- Grade 1 = 0%
- Grade 2 = 7%
- Grade 3 = 35%
- Grade 4 = 21%
Fisher CM, Kistler JP, Davis JM.