Location of cerebral aneurysms and arteriospasm after subarachnoid hemorrhage

On the basis of an analysis of 314 patients with aneurysms situated supratentorially the authors tried to establish a possible correlation between the location of the aneurysm and the frequency, intensity and extent of this spasm. Similarly as in the reports of other authors it was not possible to find a correlation between the location of the aneurysm and arteriospasm. Only the group of 28 patients with multiple aneurysms showed the highest percent of most intense and most extensive arteriospasm, which was particularly evident within the first three days after haemorrhage. In the period from the 4th to the 6th days after the last subarachnoid haemorrhage the lowest proportion of angiograms with arteriospasm was noted in patients with aneurysms of the anterior communicating artery. In this group diffuse bilateral arteriospasm was significantly more frequent than in the remaining groups.