Table 2 Grading based on CT-scan as defined by the (modified) Fisher scale and associated risk for delayed cerebral ischaemia (DCI)
Grade | modified Fisher scale | DCI risk |
|---|---|---|
0 | absent SAH or intraventricular haemorrhage | minimal (0%) |
1 | focal or diffuse, thin (< 1 mm) SAH, no intraventricular haemorrhage | low (24%) |
2 | focal or diffuse, thin (< 1 mm) SAH, present intraventricular haemorrhage | moderate (33%) |
3 | focal or diffuse, thick (> 1 mm) SAH, no intraventricular haemorrhage | moderate (33%) |
4 | focal or diffuse, thick (> 1 mm) SAH, present intraventricular haemorrhage | high (40%) |