[Intraoperative hemorrhages during the surgical treatment of aneurysms of the cerebral vessels].

The study indicated that intraoperative hemorrhages more frequently occurred at early surgery. During operations made in the first 7, 8-14 days of and after a fortnight of aneurysmal rupture, the incidence of hemorrhage was 27.5, 23, and 22%, respectively. Intraoperative hemorrhage more commonly occurred from carotid aneurysms at surgery within the first 14 days after the onset of bleeding and from anterior connective arterial aneurysm at surgery made later. Intraoperative hemorrhage deteriorated surgical outcomes. In bleeding from the anterior communicans, carotid, and middle cerebral artery aneurysms, the postoperative mortality showed 1.5-, 2-, and 2.5-fold increases, respectively. At the same time, the outcomes of interventions depended on the duration of temporary clipping of the great cerebral arteries.