The Barrow Neurological Institute (BNI) grade for subarachnoid hemorrhage in brain CT scans is better than the Fisher grade for the prediction of symptomatic vasospasm. The authors are from Barrow Neurological Institute at St. Joseph's Hospital in Phoenix.
Patient selection: subarachnoid hemorrhage (SAH)
Outcome: symptomatic vasospasm, with an incidence of 20.6%
Exam: brain CT scans
Parameter: maximum thickness of SAH in mm
Maximum SAH Thickness
BNI Grade
none visible
1
<= 5.00 mm
2
5.01 to 10.00 mm
3
10.01 to 15.00 mm
4
> 15.00 mm
5
BNI Grade
Symptomatic Vasospasm
1
0
2
13%
3
22%
4
30%
5
50%
after Figure 3
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