Training institution: Hanoi Medical University New conclusions of the thesis: Researched on 84 patients of aneurysm subarachnoid hemorrhage, at the Emergency Department of Bach Mai Hospital beetween January 2015 and April 2018, female accounted for 55.95% (47 patients), mean age 59.1 ± 11.8, with 25.64% of the patients showing delayed cerebral ischemia complications.