A CT grading system proposed by Fisher et al. [8] is frequently used to predict the likelihood of developing angiographic vasospasm (Table 18.2). When the subarachnoid blood was not detected or was distributed diffusely, severe vasospasm was almost never encountered. In the presence of subarachnoid blood, clots or thick layers of hemorrhage, severe spasm followed almost invariably.

Table 18.1. Hunt and Hess Scale and World Federation of Neurosurgical Societies Scale.


Hunt and Hess scale

WFNS scale

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