Modified Fisher grade for SAH
Grade 0: No subarachnoid or intraventricular haemorrhage detected.
Grade 1: Focal or diffuse, thin (<1 mm) subarachnoid hemorrhage, no intraventricular hemorrhage.
Grade 2: Thin (<1 mm) focal or diffuse subarachnoid hemorrhage, intraventricular hemorrhage present.
Grade 3: Thick (> 1mm) focal or diffuse subarachnoid hemorrhage, no intraventricular hemorrhage present.
Grade 4: Thick (> 1mm) focal or diffuse subarachnoid hemorrhage, intraventricular hemorrhage present.
References
Prediction of symptomatic vasospasm after subarachnoid hemorrhage: the modified fisher scale. Neurosurgery. 2006 Jul;59(1):21-7
doi:
10.1227/01.NEU.0000218821.34014.1B
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