Claassen et al proposed a rating scale for CT changes seen on brain CT. The grade correlates with delayed cerebral ischemia and infarction. The authors are from Columbia University.
Exam: brain CT in a patient with subarachnoid hemorrhage
Parameters:
(1) subarachnoid hemorrhage (SAH) in any cistern or ventricle
(2) inraventricular hemorrhage (IVH)
Subarachnoid Hemorrhage
Intraventricular Hemorrhage
Grade
none
none
0
minimal or thin
none
1
minimal or thin
in both lateral ventricles
2
thick
none
3
thick
in both lateral ventricles
4
where:
• The presence of no SAH and ventricular hemorrhage is not covered.
• The handling of hemorrhage in only 1 ventricle is ambiguous and presumed Grade 1.
Grade
Delayed Cerebral Ischemia
Infarction
0
0%
0%
1
12%
6%
2
21%
14%
3
19%
12%
4
40%
28%
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