Cerebral vasospasm is the prolonged, intense
vasoconstriction of the larger
conducting arteries in the
subarachnoid space which is initially surrounded by a
clot. Significant narrowing develops gradually over the first few days after the
aneurysmal rupture. This spasm usually is maximal in about a week's time following
haemorrhage. Vasospasm is the one of the leading causes of death after the aneurysmal rupture along with the effect of the initial haemorrhage and later bleeding.