A series of 76 poor-grade (Hunt and Hess IV and V) patients after aneu
rysmal subarachnoid haemorrhage and early operation, was investigated
in terms of post-operative outcome. The overall outcome was favourable
in 41 (54%) patients and unfavourable in 35 (46%) patients. The morta
lity rate of 28% in all poor-grade patients after early surgery was ac
ceptable, compared to mortality rates ranging from approximately 95% t
o 100% in regimes with nonsurgical treatment.