Delayed ischaemic neurological deterioration (DIND) attributable to ischaemia or vasospasm was encountered in a total of 55 patients during the post operative period. Nineteen (35%) of these patients also had angiographic vasospasm on the preoperative angiogram. Twenty five patients [angiographic vasospasm in 7 (28%)] were in group 1 and 30 [angiographic vasospasm in 12 (40%)] in group 2. Seventeen patients in group 1, and 10 patients in group 2 (i.e. 27 out of 55) made satisfactory recovery and were left with minimal or no deficit at the end of 1 month after surgery.