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lüll Computed tomography grading schemes used to predict cerebral vasospasm after aneurysmal subarachnoid hemorrhage: a historical review Klimo P Jr; Schmidt RHNeurosurg Focus 2006[Sep]; 21 (3): E5The elucidation of predictive factors of cerebral vasospasm following aneurysmal subarachnoid hemorrhage (SAH) is a major area of both clinical and basic science research. It is becoming clear that many factors contribute to this phenomenon. The most consistent predictor of vasospasm has been the amount of SAH seen on the postictal computed tomography scan. Over the last 30 years, it has become clear that the greater the amount of blood within the basal cisterns, the greater the risk of vasospasm. To evaluate this risk, various grading schemes have been proposed, from simple to elaborate, the most widely known being the Fisher scale. Most recently, volumetric quantification and clearance models have provided the most detailed analysis. Intraventricular hemorrhage, although not supported as strongly as cisternal SAH, has also been shown to be a risk factor for vasospasm.|History, 20th Century[MESH]|Humans[MESH]|Intracranial Aneurysm[MESH]|Predictive Value of Tests[MESH]|Subarachnoid Hemorrhage/complications[MESH]|Tomography, X-Ray Computed/history/*methods[MESH]|Vasospasm, Intracranial/*diagnosis/etiology[MESH] |